CN105803185B - A kind of beneficiation method of aufe oxide ore packet classification synthetical recovery - Google Patents

Abstract

The invention discloses a beneficiation method for grouping, classifying and comprehensively recovering gold-iron oxide ore. Grind the raw ore, add water to adjust the slurry, and perform weak magnetic separation to obtain weak magnetic separation concentrate and weak magnetic separation tailings. The weak magnetic separation tailings are subjected to strong magnetic separation to obtain strong magnetic separation concentrate and non-magnetic products. Weak magnetic separation concentrate, strong magnetic separation concentrate and non-magnetic products are added separately for cyanidation leaching, and magnetite concentrate, limonite concentrate and gold-bearing precious liquid are finally obtained after leaching. The method of the invention has high recovery rate and low cost. The iron grade of the obtained magnetite concentrate is 60-63.21%, and the iron recovery rate is 30-33%. The iron grade of the limonite concentrate is 50-52%, and the iron recovery rate is 55-58%, and the gold recovery rate of gold-containing precious liquid is 90-92%. It is suitable for the comprehensive recovery of valuable elements in gold-iron oxide ore, and has important promotion and application value.

Description

A beneficiation method for classification and comprehensive recovery of gold-iron oxide ore

technical field

The invention relates to the technical field of mineral processing, more specifically, to a beneficiation method for efficiently recovering gold and silver from gold and silver precious liquid, in particular to efficiently recovering gold and silver from precious liquid with high associated silver content in a gold ore, so as to realize gold Mineral processing methods that maximize silver adsorption efficiency and silver recovery.

Background technique

Gold is a kind of noble metal with the element symbol Au and a density of 19.29~19.37g/cm ³ . It has the characteristics of iron and sulfur. It is usually combined with pyrite, chalcopyrite and other sulfide ores in the crust, as well as magnetite, brown Iron ore and other oxide ores are associated. Gold iron oxide ore refers to a kind of oxidized ore containing gold and iron. The iron minerals usually occur in magnetite, hematite, limonite and so on. The occurrence state of gold is usually divided into three types: single gold, fissure gold, and wrapped gold, and it is usually closely related to the intercalation of iron. Therefore, a comprehensive evaluation is required in the formulation of the sorting process.

In terms of process selection, there are usually two types of gold before iron and iron before gold. Among them, gold before iron is suitable for the case of coarser gold inlaid cloth. Under the premise of the recovery rate of the gold, it is necessary to Coarse grinding is beneficial to the recovery of iron, and has the advantages of simple process; iron first and then gold is more suitable for ores with close relationship between gold and iron intercalation and difficult to dissociate. Gold, so as to maximize the recovery of the two elements of gold and iron to achieve comprehensive utilization.

The Chinese patent application whose publication number is CN101348859 discloses a method for comprehensively recovering gold, iron and sulfur resources from gold-bearing pyrite, including grinding the medium and low-grade pyrite ore containing microscopic gold and wrapped gold, and gold sulfur Mixed flotation to obtain gold-containing high-grade sulfur concentrate, the concentrate is roasted peroxygen in a fluidized fluidized furnace, the flue gas is used to make acid, and the slag is turned into gold-containing slag, then chlorinated, volatilized and roasted, and the flue gas is collected to obtain gold concentrate The slag is used as raw material for ironmaking, and the three elements of gold, sulfur and iron are comprehensively recovered. This method is mainly aimed at gold-bearing pyrite ore, and is not suitable for gold-iron oxide ore.

The Chinese application with the publication number CN104404261A discloses a method for synchronous reduction and recovery of gold and iron by chlorination and roasting of gold concentrate cyanidation tailings, which belongs to the technical field of comprehensive resource utilization. The energy consumption of the treatment process has realized the resource utilization of low-grade gold ferricyanide tailings. However, the process of this method is relatively complicated, and the research object is already tailings. If starting from raw ore, the technical effect is uncertain.

Xiao Kunming et al. used the flotation-roasting-leaching combined process in "Experimental Research on the Comprehensive Utilization of Cyanide Tailings" (Mining Research and Development, 2014, 04:85-87.) to process gold, iron and sulfur in cyanide tailings. Comprehensive recovery and utilization, flotation sulfur concentrate roasting acid, cinder cyanide leaching gold, leaching slag into iron concentrate.

Generally speaking, scientific and technological workers in this field have done a lot of research work on the comprehensive recovery of gold-iron sulfide ore, but there are few research results on gold-iron oxide ore. The present invention just fills up this gap, and aims to provide a reasonable sorting process so as to comprehensively recycle two elements closely related to each other, gold and iron.

Contents of the invention

The purpose of the present invention is to provide a kind of beneficiation method for the classification and classification of gold-iron oxide ore in view of the technical blank of the existing gold-iron oxide ore classification and comprehensive recovery. The method of the invention has the advantages of reasonable sorting sequence and strong adaptability, and can Comprehensive recovery of gold and iron.

The purpose of the present invention is achieved through the following technical solutions:

A mineral processing method for grouping and classifying gold-iron oxide ores is provided, comprising the following steps:

S1. Grinding: Grinding until the fineness of the mineral material is -0.074mm accounts for 65-75%;

S2. Magnetic separation is carried out after the ore material after grinding is adjusted to obtain strong magnetic products and weak magnetic separation tailings respectively. The strong magnetic products are gold-containing magnetite, and the magnetic field strength of the magnetic separation is 150-300mT;

S3. The weak magnetic separation tailings are subjected to magnetic separation with a magnetic field strength of 700-900mT to obtain weak magnetic products and non-magnetic products respectively, and the weak magnetic products are gold-containing limonite;

S4. Cyanide leaching of gold-containing magnetite, gold-containing limonite, and non-magnetic products respectively;

The gold-iron oxide ore is gold-bearing magnetite ore and limonite.

Preferably, the pulp concentration of the ore grinding in step S2 is set to 50-60% (mass percentage concentration). Further, a ball mill is used for grinding.

Preferably, the pulping in step S2 is pulping (adding water or concentrating and dehydrating) the ground material to obtain pulp with a concentration of 30% (mass percentage concentration).

Preferably, step S2 is to feed the ground pulp into a weak magnetic separator at a constant speed for magnetic separation. The weak magnetic separator is preferably a drum type weak magnetic separator.

Preferably, in step S3, the weak magnetic separation tailings are fed into the high gradient magnetic separator at a constant speed for magnetic separation. The high gradient magnetic separator is preferably a vertical ring continuous high gradient magnetic separator and a small testing machine thereof.

Preferably, the stirring intensity of the cyanidation leaching described in step S4 is 1350-1450 rpm.

Preferably, the conditions for cyanide leaching in step S4 are as follows: the amount of sodium cyanide is 1500-2500 g/t, the pulp concentration is 25-35% by mass, the pH of the pulp is 9-11, the leaching time is 24-48 hours, and the lime The addition amount is 10-20kg/t.

The gold-containing magnetite, gold-containing limonite, and non-magnetic products leached in step S4 are magnetite products, limonite products, and tailings, respectively.

Compared with prior art, the beneficial effect of the present invention is:

The present invention scientifically adopts the beneficiation method of magnetite ore and limonite containing gold by magnetic separation group classification and then cyanidation leaching, which can effectively ensure the recovery rate of iron and solve the problem of gold and iron in the sorting sequence. Contradiction, fills the gap in the technical field; after the raw ore is coarsely ground and classified by magnetic separation, it only needs to regrind a product containing gold-containing magnetite to carry out cyanidation gold separation, which greatly saves the cost of ore grinding; the present invention The method of magnetic separation not only classifies the minerals according to the magnetic grouping, but also classifies the fine mud into the non-magnetic products in terms of particle size, thereby purifying the cyanide leaching environment of magnetite and limonite, and eliminating the effect of fine particles on the leaching effect. It is suitable for the comprehensive recovery of gold and iron elements in gold and iron oxide ore.

The present invention accurately sums up the magnetic field intensity of each step of grouping magnetic separation, and the gold-containing magnetite ore and limonite ore are subjected to weak magnetic separation and strong magnetic separation respectively to obtain weak magnetic separation concentrate, strong magnetic separation concentrate and non-magnetic products , and then add lime and sodium cyanide to carry out stirring and leaching, and finally obtain magnetite concentrate, limonite concentrate and precious liquid containing gold after leaching. The iron grade of the magnetite concentrate obtained by the present invention is 60-63%, the iron recovery rate is 30-33%, the iron grade of the limonite concentrate is 50-52%, and the iron recovery rate is 55-58%. The recovery rate of gold is 90-92%. The invention provides a mineral processing method with high recovery rate and low cost, which is suitable for the comprehensive recovery of valuable elements in gold-iron oxide ore, and has important practical popularization and application value.

Description of drawings

Fig. 1 process flow chart of the present invention.

detailed description

The present invention will be further described below in conjunction with specific examples. The ore sources described in the following examples are for illustrative purposes only and should not be construed as limitations on the present invention. Unless otherwise specified, the raw materials used in the following examples are those obtained from conventional market channels in the art. Unless otherwise specified, the methods and equipment used in the following examples are methods and equipment commonly used in the art.

The process flow diagram in the embodiment of the present invention is as shown in accompanying drawing 1.

Example 1

In this embodiment, the ore is gold-iron oxide ore in a certain place in Yunnan, where the iron minerals are mainly magnetite and limonite, and the gold is mainly embedded in the iron minerals and gangues in fine grains.

S1. Mix the raw ore with water to form a pulp with a concentration of 50%, add it to a ball mill for grinding, and the grinding fineness is -0.074mm, accounting for 65%;

S2. After the ore pulp is adjusted to a concentration of 30%, it is added to a weak magnetic separator at a constant speed, and the magnetic field strength is 150mT to obtain a strong magnetic product and a weak magnetic separation tailings respectively. The strong magnetic product is gold-containing magnetite;

S3. Add the tailings of the weak magnetic separation to the high gradient magnetic separator, the magnetic field strength is 700mT, respectively obtain the weak magnetic product and the non-magnetic product, and the weak magnetic product is gold-containing limonite;

S4. The gold-bearing magnetite, gold-bearing limonite and non-magnetic products are cyanided and leached separately, the dosage of sodium cyanide is 1500g/t, the concentration of the pulp is 25%, the pH of the pulp is 9, and the leaching time is 24 hours. Concentrated treatment of gold-containing precious liquid.

The final product index is 63.21% magnetite concentrate grade, 30.78% iron recovery rate, 50.14% limonite concentrate grade, 55.45% iron recovery rate, and 90.54% total gold recovery rate in cyanide leaching solution.

Example 2

In this embodiment, the ore is gold-iron oxide ore in a certain place in Sichuan, where the iron minerals are mainly magnetite and limonite, and the gold is mainly embedded in the iron minerals and gangues in fine grains.

S1. Mix the raw ore with water to form a slurry with a concentration of 55%, add it to a ball mill for grinding, and the grinding fineness is -0.074mm, accounting for 70%;

S2. After the ore pulp is adjusted to a concentration of 30%, it is added to a weak magnetic separator at a constant speed, and the magnetic field strength is 200mT to obtain strong magnetic products and weak magnetic separation tailings respectively. The strong magnetic products are gold-containing magnetite;

S3. Add the tailings of the weak magnetic separation to the high gradient magnetic separator, the magnetic field strength is 800mT, respectively obtain the weak magnetic product and the non-magnetic product, and the weak magnetic product is gold-containing limonite;

S4. The gold-bearing magnetite, gold-bearing limonite and non-magnetic products are cyanided and leached separately, the dosage of sodium cyanide is 2000g/t, the pulp concentration is 30%, the pH of the pulp is 10, and the leaching time is 36 hours. Concentrated treatment of gold-containing precious liquid.

The final product indicators are 61.38% magnetite concentrate grade, 32.12% iron recovery rate, 51.85% limonite concentrate grade, 56.32% iron recovery rate, and 91.57% total gold recovery rate in cyanide leaching solution.

Example 3

In this embodiment, the ore is gold-iron oxide ore in a certain place in Shandong, where the iron minerals are mainly magnetite and limonite, and the gold is mainly embedded in the iron minerals and gangues in fine grains.

S1. Mix the raw ore with water to form a slurry with a concentration of 60%, add it to a ball mill for grinding, and the grinding fineness is -0.074mm, accounting for 75%;

S2. After the ore pulp is adjusted to a concentration of 30%, it is added to a weak magnetic separator at a constant speed, and the magnetic field strength is 300mT to obtain a strong magnetic product and a weak magnetic separation tailings respectively. The strong magnetic product is gold-containing magnetite;

S3. Add the tailings of the weak magnetic separation to the high gradient magnetic separator, the magnetic field strength is 900mT, respectively obtain the weak magnetic product and the non-magnetic product, and the weak magnetic product is gold-containing limonite;

S4. The gold-bearing magnetite, gold-bearing limonite and non-magnetic products are cyanided and leached separately, the dosage of sodium cyanide is 2500g/t, the pulp concentration is 35%, the pH of the pulp is 11, and the leaching time is 48 hours. Concentrated treatment of gold-containing precious liquid. The final product index is 60.56% magnetite concentrate grade, 30.82% iron recovery rate, 50.95% limonite concentrate grade, 57.14% iron recovery rate, and 91.07% total gold recovery rate in cyanide leaching solution.

Claims (7)

1. the beneficiation method of an aufe oxide ore packet classification, it is characterised in that comprise the following steps:

S1. ore grinding: ore grinding accounts for 65～75% to mineral aggregate fineness for-0.074mm；

S2. carry out magnetic separation after being sized mixing by the mineral aggregate after ore grinding, respectively obtain ferromagnetism product and low intensity magnetic separation mine tailing, ferromagnetism product I.e. containing gold magnetic iron ore, the magnetic field intensity of described magnetic separation is 150～300mT；

S3. it is 700～900mT magnetic separation by low intensity magnetic separation mine tailing through magnetic field intensity, respectively obtains weak magnetic product and non-magnetic product, Weak magnetic product is i.e. containing gold limonite；

S4. gold magnetic iron ore will be contained, containing gold limonite, non-magnetic product Cyanide Leaching respectively；

Described aufe oxide ore is the magnetic iron ore containing gold and limonite ore；

The condition of Cyanide Leaching described in step S4 is: Cyanogran. consumption 1500～2500g/t, pulp density 25～35% mass hundred Proportion by subtraction, slurry pH is 9～11, and extraction time is 24～48 hours, and lime adding amount is 10～20kg/t.

The beneficiation method of aufe oxide ore packet classification the most according to claim 1, it is characterised in that ore grinding described in step S2 Pulp density be set as 50～60%.

The beneficiation method of aufe oxide ore the most according to claim 1 or claim 2 packet classification, it is characterised in that be to use ball milling Machine carries out ore grinding.

The beneficiation method of aufe oxide ore packet classification the most according to claim 1, it is characterised in that size mixing described in step S2 Be by ore grinding after mineral aggregate size mixing and obtain the ore pulp that concentration is 30%.

The beneficiation method of aufe oxide ore packet classification the most according to claim 1, it is characterised in that step S2 is by ore grinding After ore pulp at the uniform velocity add weak magnetic separator and carry out magnetic separation.

The beneficiation method of aufe oxide ore packet classification the most according to claim 5, it is characterised in that described weak magnetic separator Use drum-type weak magnetic separator.

The beneficiation method of aufe oxide ore packet classification the most according to claim 1, it is characterised in that step S3 is by weak magnetic Select mine tailing at the uniform velocity to add high gradient magnetic separator and carry out magnetic separation.