CN115141938B - A method for depleting copper smelting slag by using copper refining slag - Google Patents
A method for depleting copper smelting slag by using copper refining slag Download PDFInfo
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- CN115141938B CN115141938B CN202110409452.5A CN202110409452A CN115141938B CN 115141938 B CN115141938 B CN 115141938B CN 202110409452 A CN202110409452 A CN 202110409452A CN 115141938 B CN115141938 B CN 115141938B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0054—Slag, slime, speiss, or dross treating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
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Abstract
一种利用铜精炼熔渣对铜冶炼熔渣进行贫化的方法，属于环境、铜冶金与资源综合利用领域。向铜冶炼工序的贫化电炉、沉降电炉、贫化区、沉降区、前床或渣包里的铜熔炼熔渣，或铜熔炼熔渣与吹炼熔渣的混合熔渣中，加入铜精炼渣，或铜精炼渣与新型贫化药剂，促进铜组分长大与沉降，既可以改善火法贫化效果，又可以提高浮选技术指标，火法贫化后熔渣可以直接作为炼铁的原料或浮或磁选或水泥的原料。A method for impoverishing copper smelting slag using copper refining slag belongs to the field of environment, copper metallurgy and comprehensive utilization of resources. Copper refining slag, or copper refining slag and new impoverishing agents are added to the copper smelting slag in the impoverishing electric furnace, settling electric furnace, impoverishing zone, settling zone, front bed or slag bag in the copper smelting process, or the mixed slag of copper smelting slag and blowing slag to promote the growth and sedimentation of copper components, which can improve the pyrometallurgical impoverishment effect and improve the flotation technical indicators. The slag after pyrometallurgical impoverishment can be directly used as raw material for ironmaking or flotation or magnetic separation or raw material for cement.
Description
Technical Field
The invention belongs to the fields of environment, copper metallurgy and comprehensive utilization of resources, and particularly relates to a method for depleting copper smelting slag by utilizing copper smelting slag.
Background
In the pyrometallurgy process of copper sulphide ore and reclaimed copper, a large amount of copper smelting slag, copper blowing slag and copper refining slag are generated, and the copper component content in the copper refining slag is up to 40wt%. At present, the copper smelting and converting slag is treated by adopting a pyrogenic depletion and beneficiation process.
The disadvantages of the fire depletion method are: ① Poor depletion effect and high copper content in slag; ② The addition amount of the reducing agent, the vulcanizing agent, the CaO and the like is large, and the cost of the medicament is high; ③ The depletion temperature is high (1200-1450 ℃), the time is long, and the electricity consumption is high; ④ The medicament contains harmful components, which influence the utilization of tailings after depletion.
Copper smelting slag is subjected to floatation treatment by a copper beneficiation method, and floatation indexes are as follows: the copper content of the slag is 0.23-0.35 wt%. The technical index is far better than that of fire dilution, and most copper smelting enterprises select a mineral separation method. The mineral separation method has the following defects: ① The slag has low activity, can not be used as a cement raw material, and can only be stacked; ② Fine grinding granularity (less than or equal to 30 mu m), easy drifting, large pollution and difficult stacking.
The disadvantage of the copper refining slag treated by adopting the return converting process is that: the processing capacity of the converting process is reduced, the enterprise benefit is reduced, the waste of physical heat of refined slag is caused, the iron component cannot be utilized, and the slag contains high copper; after the copper refining slag generated by smelting the reclaimed copper is subjected to high-temperature furnace depletion treatment, the copper content of the slag is more than 1 weight percent, which is far higher than the optional grade of copper ore by 0.1 weight percent, and the waste of copper resources is caused.
Aiming at the novel copper depletion technology, a great deal of research is carried out at home and abroad, but the technology is difficult to apply, and the main reasons are as follows: ① The specific gravity of the depletion agent is small, and the depletion effect is poor; ② The addition amount of the depletion agent is large, and the cost is high; ③ The cost of the depleted medicament is high; ④ The depletion temperature is high, and the cost is high; ⑤ The medicament contains harmful components, which influence the utilization of tailings after depletion; ⑥ The method is only suitable for smelting slag, and cannot be used for blowing the smelting slag and refining slag.
In order to solve the above problems, a new technique for copper smelting slag depletion and iron component utilization must be developed, and the following requirements must be satisfied: ① The depletion effect is good (the copper content in the slag is less than or equal to 0.40 wt%), and the tailings are directly used as iron-making raw materials; ② has low cost; ③ The depletion temperature is low, the slag is directly added on line, and the slag is used for physical heat without heating; ④ The metallurgical furnace equipment, the furnace life and the like are not affected; ⑤ Realizing the utilization of physical heat and iron components of slag; ⑥ Simultaneously applied to smelting slag, blowing slag and refining slag; ⑦ The equipment of the existing smelting process is utilized, the equipment is not required to be added, the method can be applied to the existing pyrometallurgy depletion process and the ore dressing process, the copper component growth, sedimentation and magnetite growth are promoted, the flotation and magnetic separation effects are improved, and the copper and cost of slag are reduced.
Disclosure of Invention
Aiming at the problems existing in the prior art, the preparation and the application method of the copper smelting slag depletion agent are provided. Copper refining slag or copper refining slag and novel depletion agents are added into copper smelting slag in a depletion electric furnace, a sedimentation electric furnace, a depletion zone, a sedimentation zone, a front bed or a slag ladle of a copper smelting process or mixed slag of the copper smelting slag and the blowing slag, so that copper components are promoted to grow and sediment, the fire depletion effect can be improved, the flotation technical index can be improved, and the slag after the fire depletion can be directly used as a raw material for iron making or a raw material for floating or magnetic separation or cement.
The method has good reaction depletion effect, directly utilizes the equipment and slag of the existing copper smelting process, does not need to add depletion agent, does not need to increase equipment and heating, has low production cost, short flow, large treatment capacity, environment friendliness and high economic benefit, can effectively solve the problems of environmental pollution, high-efficiency utilization of heat energy and resources and the like, and realizes that the copper content of the slag is less than or equal to 0.30wt% after the copper smelting slag is depleted on line.
The technical scheme of the invention is as follows:
a method for depleting copper smelting slag by utilizing copper refining slag, which specifically comprises the following steps:
step 1, adding refined slag on line for depletion:
Adding copper refining slag on line or adding copper refining slag and a depletion agent on line into copper smelting slag in a depletion electric furnace, a smelting furnace sedimentation electric furnace, a smelting furnace depletion zone, a smelting furnace sedimentation zone, a smelting furnace front bed or a slag ladle in a copper smelting process, and carrying out sedimentation depletion treatment;
The copper smelting slag is one or two of copper smelting slag and copper converting slag; the addition proportion of the copper converting slag in the mixed slag consisting of the copper smelting slag and the copper converting slag is less than or equal to 30wt%;
The copper refining slag or the composition of the copper refining slag and the depletion agent accounts for less than or equal to 10wt% of the copper smelting slag; the addition amount of the depletion agent is less than or equal to 2.0wt percent based on 100wt percent of the total copper smelting slag.
The specific gravity of the depleted medicament is greater than 2.6g/cm 3;
step 2, copper component growth, sedimentation and magnetite component growth:
after the depletion treatment, the copper component grows up and subsides, and the copper component is deposited at the bottom to obtain a copper-rich melt at the bottom and depleted slag at the middle and upper parts; the copper-rich melt at the bottom is obtained by growing and settling copper smelting slag; magnetite phase in the depleted slag at the middle and upper parts is grown up;
step 3, treating the copper-rich melt and middle-upper depleted slag after depleted and settled:
① After copper smelting slag is depleted and settled, the slag ladle treatment is not included, the copper-rich melt is directly sent to a converting furnace or is cooled and then sent to a water converting furnace, the depleted slag at the middle upper part is directly used as a raw material for iron making, or is directly used as a raw material for cement after water quenching, or is used as a rust remover, or is poured into the slag ladle to be slowly cooled and then is used as a raw material for flotation separation of copper or magnetic separation of magnetite;
② And (3) after the copper smelting slag in the slag ladle is depleted and settled, slowly cooling to room temperature, conveying a copper-rich phase at the bottom to a converting furnace, and taking slag at the middle upper part as a raw material for a combined separation process of copper flotation separation and magnetite separation.
Further, the depletion agent is one or more than two of ferroalloy, coal-fired slag, coal gangue, fly ash, carbide, coal gasification slag, oil shale residue, stone coal and stone coal slag.
Further, the depletion agent can be added into one or more than two of blast furnace slag, steel slag, quartz, caCO 3, lime, feO and copper refined slag.
Further, the carbide is one or the combination of more than two of iron carbide, manganese carbide, chromium carbide, titanium carbide, silicon carbide and vanadium carbide; the iron alloy is one or more than two of ferrosilicon, ferrosilicon-aluminum, ferrosilicon-calcium-aluminum, ferrosilicon-carbon and ferrosilicon.
Further, the copper refining slag is added together with the copper smelting slag or the mixed slag, or the copper refining slag is added after the copper smelting slag or the mixed slag is added.
Further, the copper smelting process is a copper smelting process, a converting process, a sedimentation or depletion process.
Further, the copper refining slag is directly from the copper refining furnace.
Further, the copper refining slag is in a cold state or a hot state or a molten state.
Further, the online joining means: directly processing slag on a copper smelting production line, and directly adding the slag into a melt or slag in a depletion electric furnace, a smelting furnace sedimentation electric furnace, a smelting furnace depletion zone, a smelting furnace sedimentation zone, a smelting furnace front bed or a slag ladle without cooling and heating or adding equipment; or directly added into a slag stream or chute flowing to a depletion electric furnace, a smelting furnace sedimentation electric furnace, a smelting furnace depletion zone, a smelting furnace sedimentation zone, a smelting furnace front bed or slag ladle, and added together with the melt or slag; the melt refers to a mixture of matte and slag.
Further, the depletion sedimentation time in the step 1 and the step 2 is more than or equal to 30min.
Further, the depletion effect is ordered as: the mixed slag of the copper smelting slag and the copper converting slag is more than single copper smelting slag.
Further, in the step 2: under the condition of smelting and blowing mixed slag, after the copper smelting slag is depleted and settled, the copper content of slag in the depleted slag at the middle upper part is less than or equal to 0.29wt%; under the condition of single smelting slag, after the copper smelting slag is depleted and settled, the copper content of slag in the depleted slag at the middle upper part is less than or equal to 0.35wt%.
Further, in the step 3: after slowly cooling the depleted slag at the middle and upper parts, the average grain size of the copper-rich phase is more than or equal to 50 mu m, the volume fraction of the copper-nickel phase with the grain size of more than 38 mu m accounts for more than 80% of the total copper component, the flotation grinding grain size is more than or equal to 40 mu m, and after flotation, the copper content of the slag is less than or equal to 0.16wt%; after the middle-upper depleted slag is slowly cooled, the average grain size of the magnetite phase is more than or equal to 80 mu m, and the total iron grade in the magnetic separation iron concentrate is more than or equal to 50wt%.
The principle and the beneficial effects of the invention are as follows:
(1) Copper refining slag and depletion agent are added on line in a mode of combining with smelting slag
On-line addition principle and advantage:
Directly treating slag on a smelting production line, and directly adding copper refining slag and a novel lean medicament into copper smelting slag of different combinations in a lean electric furnace, a smelting furnace sedimentation electric furnace, a smelting furnace lean zone, a smelting furnace sedimentation zone, a smelting furnace front bed or a slag ladle in a copper smelting process;
On one hand, the reaction speed is high, and on the other hand, physical heat is brought to the molten copper refining slag;
advantages are: the method has the advantages of no need of heating, no need of adding equipment, simple operation, high reaction speed and low cost.
The adding mode is as follows:
Directly adding the molten iron or the molten slag into a depletion electric furnace, a smelting furnace sedimentation electric furnace, a smelting furnace depletion zone, a smelting furnace sedimentation zone, a smelting furnace front bed or a slag ladle on line, or adding the molten iron or the molten slag into a slag flow or a chute (a mixture of copper matte and the molten slag is arranged in a groove) flowing into the depletion electric furnace, the smelting furnace sedimentation electric furnace, the smelting furnace depletion zone, the smelting furnace sedimentation zone, the smelting furnace front bed or the slag ladle on line, and adding the molten iron or the molten slag together;
advantages are: the operation is simple, and the cost is low.
Mixing smelting slag and converting slag:
On-line addition of converting slag mechanism: (1) The Fe/SiO 2 of smelting slag is improved, the FeO promotes Cu 2 O to be released from silicate phase to form free Cu 2 O, the released free Cu 2 O reacts with Cu 2 S in slag, cu 2O+Cu2S＝Cu+SO2,Cu2 O basically disappears, and Cu 2 S with low melting point and high specific gravity exists with Cu, so that the sedimentation of copper-rich phase is promoted; (2) Promoting the reaction Fe 3O4+FeS＝4FeO+SO2 to be carried out, reducing the content of Fe 3O4, reducing the viscosity of slag, and facilitating the growth and sedimentation of a copper-rich phase;
Advantages are: (1) the copper-rich phase is easy to grow up and settle; (2) the temperature of the converting slag is high, and the sedimentation of the copper-rich phase is accelerated; (3) reducing copper content in the smelting slag and the blowing slag; (4) No need of depleting agent, heating and equipment, simple operation and low cost.
(2) Copper refining slag and novel depletion agent action principle and advantage
Copper refining slag adding principle: (1) Free Cu 2 O in the copper refining slag reacts with Cu 2 S in the slag to generate Cu 2 S and Cu with low melting point and high specific gravity, and the sedimentation of a copper-rich phase is promoted; (2) Higher levels of alkaline earth oxides in the slag, such as CaO, etc., reduce the viscosity of the slag, promoting the settling of the copper-rich phase; (3) The high content of iron oxide in the slag promotes the release of Cu 2 O in the copper refining slag from silicate phase to form free Cu 2 O; (4) The copper refining slag is brought into SiO 2 to promote the reaction Fe 3O4+FeS+2SiO2＝2(2FeO·SiO2)+SO2
Novel principles of impoverishment agents: (1) The high specific gravity is easy to mix with copper smelting slag, avoids layering, accelerates the reaction, accelerates the reduction of the Fe 3O4 content and accelerates the sedimentation of copper-rich phases; (2) The composite medicament comprises minerals such as SiO 2, caO, a reducing agent and the like, is favorable for reducing the content of Fe 3O4, breaks the wettability of a copper-rich phase and slag, promotes the growth of the copper phase and accelerates the sedimentation of the copper-rich phase; (3) The double reducing agent has high specific gravity, is easy to mix with slag, generates metal oxides, CO and the like, promotes the viscosity of slag to be reduced, and accelerates growth and sedimentation: (4) The formation of FeO promotes the release of Cu 2 O from the silicate phase to a free state.
Advantages are: copper refining slag and a novel depletion agent act together to promote the viscosity of slag to be reduced on one hand, and Cu 2 S and Cu are generated on the other hand to promote the sedimentation of copper-rich phases.
(3) Copper component growth, sedimentation and magnetite growth
Principle of: (1) The viscosity of slag is reduced, which is favorable for the growth of copper-nickel components, sedimentation and magnetite growth; (2) Cu 2 O in the slag is basically disappeared, the copper-rich phase exists in the form of Cu 2 S and Cu, the specific gravity is increased, the meltability temperature is reduced, the wettability with oxide slag is poor, and the growth and sedimentation of copper components are facilitated.
Advantages are: the slag has low copper content, no need of heating and equipment and low cost; is favorable for flotation and magnetic separation.
(4) Treatment of bottom melt and upper middle-upper depleted slag after depleted and settled
Principle of: (1) After the copper-rich phase grows up and subsides, the copper-rich phase subsides to the bottom, the copper content of the slag is low, the copper content of the slag in the middle-upper slag is less than or equal to 0.3wt%, the slag can be directly used as a raw material for iron making, and a flotation process can be canceled; (2) And after the copper-rich phase grows up and subsides, the copper-rich phase is settled to the bottom, and after the slag at the middle and upper parts is cooled, the copper-rich phase realizes growth, thereby being beneficial to ore grinding, flotation and magnetic separation, and further reducing copper content in slag after flotation.
Advantages are: (1) The copper content of the slag is low, the copper content of the slag in the middle and upper part slag is less than or equal to 0.3wt%, the slag can be directly used as a raw material for iron making, a flotation process can be omitted, the flow is short, the cost is low, and the environment is friendly; (2) The physical heat of the bottom molten copper-rich phase is effectively utilized, the cost is reduced, and the treatment capacity is increased; (3) The copper-rich phase grows up with magnetite, the grinding granularity is large (more than or equal to 40 mu m), the grinding cost is low, the flotation and magnetic separation effects are good, the copper content of the slag is further reduced, and the copper content of the slag is less than or equal to 0.16wt%.
Detailed Description
The present invention will be further described with reference to specific embodiments thereof, which are, of course, merely examples of the invention and are not intended to represent all of the embodiments of the invention.
Example 1
A method for copper smelting slag depletion, which specifically comprises the following steps:
step 1, adding refining slag on line for depletion:
adding molten copper refining slag (total copper content is 18.12 wt%) from a copper reverberatory furnace on line into a copper smelting mixed melt (slag and matte mixed melt, slag copper content is 0.65 wt%) in a settling electric furnace of an austempered smelting furnace through a chute, and carrying out settling depletion treatment; copper refining slag and smelting slag are added together, wherein the adding proportion of the copper refining slag is 6wt% of the smelting slag;
step 2, copper component growth and sedimentation:
after the depletion treatment, the copper component grows up and subsides, the sedimentation time is 120min, the copper-rich phase is deposited to the bottom, and a copper-rich melt and middle-upper depletion slag of the bottom are obtained, wherein copper content in the depletion slag is 0.32wt%;
step 3, treating the copper-rich melt and middle-upper depleted slag after depleted and settled:
and after slag is depleted and settled, the copper-rich melt is directly sent to a converter for blowing, and the middle-upper depleted slag is directly used as a raw material for iron making.
Example 2
A method for copper smelting slag depletion, which specifically comprises the following steps:
step 1, adding refining slag on line for depletion:
Directly adding cold copper refining slag (granularity is 0.4-0.5 mm, total copper content is 21.09 wt%) from a copper rotary refining furnace into copper smelting slag (slag copper content is 0.62 wt%) and blowing mixed slag (slag copper content is 1.97wt%, and blowing slag proportion is 10 wt% of mixing copper smelting slag and blowing mixed slag) in a settling electric furnace of Ai Sa smelting furnace through slag flow on line, and performing settling depletion treatment; adding copper refining slag after the copper refining slag, wherein the adding proportion of the copper refining slag is 5wt% of the mixture of the copper smelting slag and the converting mixed slag;
step 2, copper component growth and sedimentation:
After the depletion treatment, the copper component grows up and subsides, the sedimentation time is 240min, the copper-rich phase is deposited to the bottom, and a copper-rich melt and middle-upper depletion slag of the bottom are obtained, wherein copper content in the depletion slag is 0.25wt%;
step 3, treating the copper-rich melt and middle-upper depleted slag after depleted and settled:
After slag is depleted and settled, the copper-rich melt is directly sent to a converter for blowing, and the water quenching of the slag depleted at the middle upper part is used as a rust remover;
Example 3
A method for copper smelting slag depletion, which specifically comprises the following steps:
step 1, adding refining slag on line for depletion:
through a chute, adding molten copper refining slag (total copper content: 27.15 wt%) from a copper rotary refining furnace into copper smelting mixed melt (slag and matte mixed melt, slag copper content: 0.68 wt%) and converting mixed slag (slag copper content: 1.76wt%, converting slag proportion: 6wt% of copper smelting slag and converting mixed slag) in a pre-sedimentation bed of a side-blowing furnace on line, and carrying out sedimentation depletion treatment; adding copper refining slag after the copper refining slag, wherein the adding proportion of the copper refining slag is 5wt% of the copper smelting slag and the converting mixed slag;
step 2, copper component growth and sedimentation:
After the depletion treatment, the copper component grows up and subsides, the sedimentation time is 240min, the copper-rich phase is deposited to the bottom, and a copper-rich melt and middle-upper depletion slag of the bottom are obtained, wherein copper content in the depletion slag is 0.28wt%;
step 3, treating the copper-rich melt and middle-upper depleted slag after depleted and settled:
After the slag depleted at the upper part is slowly cooled, the average grain size of the copper-rich phase is 52 mu m, the grain size is more than 38 mu m, the volume fraction of the copper-nickel phase accounts for 82% of the whole copper component, the flotation grinding grain size is 43 mu m, the copper content of the slag is 0.15wt% after flotation, the average grain size of magnetite grain size is 81 mu m, and the total iron grade of the magnetic separation iron concentrate is 53wt% after magnetic separation of flotation tailings.
Example 4
A method for copper smelting slag depletion, which specifically comprises the following steps:
step 1, adding refining slag on line for depletion:
Carrying out sedimentation and depletion treatment by adding molten copper refining slag (total copper content is 30.12 wt%) from a copper rotary refining furnace and fly ash (granularity is 150-200 μm) with specific gravity of 2.8g/cm 3 on line into copper smelting melt (smelting slag and copper matte mixed melt, slag copper content is 0.98 wt%) in a depletion zone of a silver copper smelting furnace through a chute; adding copper refined slag and fly ash, wherein the adding proportion of the copper refined slag is 5wt% of the total slag, and the adding proportion of the depletion agent is 0.3wt% of the total slag;
step 2, copper component growth and sedimentation:
After the depletion treatment, the copper component grows up and subsides, the sedimentation time is 120min, the copper-rich phase is deposited to the bottom, and a copper-rich melt and middle-upper depletion slag of the bottom are obtained, wherein copper content in the depletion slag is 0.21wt%;
step 3, treating the copper-rich melt and middle-upper depleted slag after depleted and settled:
and after slag is depleted and settled, the copper-rich melt is directly sent to a continuous converting furnace for converting, and the slag depleted at the middle upper part is used as an iron-making raw material.
Comparative example 1
A copper smelting slag depletion process, similar to example 1, differs in that: copper refining slag is not added, and after the copper smelting slag in a sedimentation electric furnace of the Style smelting furnace is sedimentated and depleted, the copper content of the slag is 0.60 weight percent, and the depletion effect is poor.
Comparative example 2
A copper smelting slag depletion process, similar to example 1, differs in that: copper refining slag is added into copper smelting slag in a settling zone of a smelting furnace in a smelting process through a chute flowing to a settling electric furnace, the adding proportion of the copper refining slag is 30wt% of that of the smelting slag, and after settling and depletion, the copper content of the slag is 1.28wt%, so that the depletion effect is poor.
Claims (8)
1. A method for depleting copper smelting slag by copper refining slag, which is characterized by comprising the following steps:
step 1, adding refined slag on line for depletion:
Adding copper refining slag and a depletion agent on line into copper smelting slag in a depletion electric furnace, a smelting furnace sedimentation electric furnace, a smelting furnace depletion zone, a smelting furnace sedimentation zone, a smelting furnace front bed or a slag ladle in a copper smelting process, and carrying out sedimentation depletion treatment;
The copper smelting slag is one or two of copper smelting slag and copper converting slag; the addition proportion of the copper converting slag in the mixed slag consisting of the copper smelting slag and the copper converting slag is less than or equal to 30wt%;
the composition of the copper refining slag and the depletion agent accounts for less than or equal to 10wt% of the copper smelting slag; the addition amount of the depletion agent is less than or equal to 2.0wt percent based on 100wt percent of the total copper smelting slag;
The specific gravity of the depleted medicament is greater than 2.6g/cm 3; the depletion agent is one or the combination of more than two of ferroalloy, coal-fired slag, coal gangue, fly ash, carbide, coal gasification slag, oil shale and oil shale slag; or adding one or more of blast furnace slag, steel slag, quartz, caCO 3, lime, feO and copper refining slag into one or more of iron alloy, coal-fired slag, gangue, fly ash, carbide, coal-fired slag, oil shale and oil shale slag;
step 2, copper component growth, sedimentation and magnetite component growth:
after the depletion treatment, the copper component grows up and subsides, and the copper component is deposited at the bottom to obtain a copper-rich melt at the bottom and depleted slag at the middle and upper parts; the copper-rich melt at the bottom is obtained by growing and settling copper smelting slag; magnetite phase in the depleted slag at the middle and upper parts is grown up;
step 3, treating the copper-rich melt and middle-upper depleted slag after depleted and settled:
① After copper smelting slag is depleted and settled, the slag ladle treatment is not included, the copper-rich melt is directly sent to a converting furnace or is cooled and then sent to a water converting furnace, the depleted slag at the middle upper part is directly used as a raw material for iron making, or is directly used as a raw material for cement after water quenching, or is used as a rust remover, or is poured into the slag ladle to be slowly cooled and then is used as a raw material for flotation separation of copper or magnetic separation of magnetite;
② After the copper smelting slag in the slag ladle is depleted and settled, slowly cooling to room temperature, conveying a copper-rich phase at the bottom to a converting furnace, and taking slag at the middle upper part as a raw material for a combined separation process of flotation separation copper and magnetic separation magnetite;
the online joining means: directly processing slag on a copper smelting production line, and directly adding the slag into a melt or slag in a depletion electric furnace, a smelting furnace sedimentation electric furnace, a smelting furnace depletion zone, a smelting furnace sedimentation zone, a smelting furnace front bed or a slag ladle without cooling and heating or adding equipment; or directly added into a slag stream or chute flowing to a depletion electric furnace, a smelting furnace sedimentation electric furnace, a smelting furnace depletion zone, a smelting furnace sedimentation zone, a smelting furnace front bed or slag ladle, and added together with the melt or slag; the melt refers to a mixture of matte and slag.
2. The method for depleting copper smelting slag from copper smelting slag according to claim 1, wherein the carbide is one or a combination of more than two of iron carbide, manganese carbide, chromium carbide, titanium carbide, silicon carbide, vanadium carbide; the ferroalloy is one or the combination of more than two of ferrosilicon, ferrosilicon and ferrosilicon.
3. A method of depleting copper smelting slag from copper smelting slag according to claim 1, characterized in that the copper smelting slag is added together with or after the copper smelting slag or the mixed slag.
4. The method for depleting copper smelting slag from copper smelting slag according to claim 1, wherein the copper smelting process is a copper smelting process, a converting process, a sedimentation or a depleting process; the copper refining slag is directly from a copper refining furnace; the copper refining slag is in a cold state or a hot state or a molten state.
5. The method for depletion of copper smelting slag by utilizing copper smelting slag as set forth in claim 1, wherein the depletion settling time in step 1 and step 2 is not less than 30min.
6. The method for depleting copper smelting slag from copper smelting slag according to claim 1, wherein the effect of depleting is ordered as follows: the mixed slag of the copper smelting slag and the copper converting slag is more than single copper smelting slag.
7. A method for depleting copper smelting slag from copper smelting slag according to claim 1, wherein in step 2: under the condition of smelting and blowing mixed slag, after the copper smelting slag is depleted and settled, the copper content of slag in the depleted slag at the middle upper part is less than or equal to 0.29wt%; under the condition of single smelting slag, after the copper smelting slag is depleted and settled, the copper content of slag in the depleted slag at the middle upper part is less than or equal to 0.35wt%.
8. A method for depleting copper smelting slag from copper smelting slag according to claim 1, wherein in step 3: after slowly cooling the depleted slag at the middle and upper parts, the average grain size of the copper-rich phase is more than or equal to 50 mu m, the volume fraction of the copper-nickel phase with the grain size of more than 38 mu m accounts for more than 80% of the total copper component, the flotation grinding grain size is more than or equal to 40 mu m, and after flotation, the copper content of the slag is less than or equal to 0.16wt%; after the middle-upper depleted slag is slowly cooled, the average grain size of the magnetite phase is more than or equal to 80 mu m, and the total iron grade in the magnetic separation iron concentrate is more than or equal to 50wt%.
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