CN1003864B - Blast furnace smelting method of manganese-rich slag - Google Patents
Blast furnace smelting method of manganese-rich slag Download PDFInfo
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- CN1003864B CN1003864B CN87101376.2A CN87101376A CN1003864B CN 1003864 B CN1003864 B CN 1003864B CN 87101376 A CN87101376 A CN 87101376A CN 1003864 B CN1003864 B CN 1003864B
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- manganese
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Abstract
The invention relates to a ferro-manganese composite pellet and application thereof in blast furnace ironmaking. The iron-manganese composite pellet produced by using the iron concentrate powder, the manganese ore powder, the additive and the wetting agent is used for smelting pig iron with high manganese content in a blast furnace, and can improve the technical and economic indexes of blast furnace smelting and improve the recovery rate of manganese. Compared with the original iron ore pellets, the iron-manganese composite pellets have higher mechanical strength and good metallurgical performance.
Description
The invention relates to agglomeration processing of iron-making raw materials and blast furnace iron-making, in particular to iron-manganese composite pellets and application thereof in blast furnace iron-making.
At present, the method for increasing the grinding fineness is generally adopted for improving the ore dressing grade in all countries in the world, and the pellet process is a main way for solving the agglomeration of fine grinding concentrate. Iron ore pellets produced from fine iron powder have been the main iron-containing raw material for blast furnace iron making in countries such as the united states, canada, etc., and are used to different extents in other countries. The existing iron ore pellets are produced by mixing raw materials such as iron fine powder, additives (such as bentonite, slaked lime, limestone and dolomite), wetting agents (generally water) and the like according to a certain proportion, and performing procedures such as mixing, pelletizing, green pellet drying, roasting, solidifying, cooling and the like. However, when iron ore pellets are used as a main iron-containing raw material in the blast furnace smelting of pig iron having a high manganese content, it is necessary to add manganese ore lumps, manganese sinter or ferromanganese ore to the charging material to increase the manganese content of the charging material. But the manganese ore blocks and the manganese sinter have high cost, and the manganese-iron ore has low iron content and low manganese recovery rate and poor smelting technical and economic indexes when being used for blast furnace smelting. In iron works with sintering equipment, manganese ore powder or ferromanganese ore is added into sintering materials to increase the manganese content of iron-smelting furnace materials. However, for iron works with only pelletizing equipment, only manganese ore blocks, manganese sinter or ferromanganese ore can be added into the charging materials to increase the manganese content of the charging materials. Therefore, it is necessary to study a manganese-containing iron ore pellet for use in blast furnace smelting of pig iron having a high manganese content.
The invention aims to provide iron-manganese composite pellets with high manganese content, which are used as iron-containing charging raw materials for smelting pig iron with high manganese content in a blast furnace.
The invention provides a ferro-manganese composite pellet which is produced by mixing fine iron powder, finely ground manganese mineral powder, additives (such as bentonite) and wetting agents (generally water), and the steps of mixing, pelletizing, drying green pellets, roasting, solidifying, cooling and the like. The iron-manganese composite pellet can be produced under the condition that the production process and the thermal system of the raw iron ore pellet are basically unchanged, the pellet consolidation mechanism still oxidizes Fe 2O4 into Fe 2O3, so that solid phase solidification of Fe 2O3 crystal growth is mainly carried out, and then the liquid phase cementing phase consolidated pellet is generated under the condition of the roasting temperature of the pellet for forming ore phases such as silicate of manganese suboxide and the like. Meanwhile, the high-valence manganese oxide in the manganese mineral powder is decomposed into oxygen to generate low-valence manganese oxide in the pellet roasting process, which is favorable for the oxidation of Fe 2O4 in the pellet and the generation of the continuous crystal and liquid-phase cementing phase of Fe 2O3, so that the strength of the pellet is improved. The practice proves that the drum strength of the iron-manganese composite pellet ore is 1-2% higher than that of the original iron ore pellet ore, and the compressive strength is improved by about 392 newtons per pellet.
The invention adopts the iron-manganese composite pellet ore as the main iron-containing raw material, and is used for smelting pig iron with higher manganese content in a blast furnace. The practice proves that the manganese content of the blast furnace pig iron smelted by the iron-manganese composite pellet meets the requirements, the components are stable, the viscosity of the blast furnace slag is low, the fluidity is good, and favorable conditions are created for iron desulfurization, uniform hearth operation and smooth running of the blast furnace.
The iron-manganese composite pellet ore provided by the invention is used as a main iron-containing raw material and is used for smelting pig iron with high manganese content in a blast furnace, so that the following comprehensive effects can be achieved:
1. the process of the present invention is used in producing composite Fe-Mn pellet and has opened new way for directly using Mn ore powder. The manganese ore powder does not need to be agglomerated independently, and compared with manganese sinter, the method can save about 25 yuan per ton of the agglomeration processing cost of the manganese ore powder and save about 120 kg of standard coal per ton of the agglomeration process energy consumption.
2. The mechanical strength of the ferro-manganese composite pellet ore is higher than that of the original iron ore pellet, which is beneficial to blast furnace smelting, and meanwhile, the ore tanks and the weighing procedures of the manganese ore blocks, the manganese sinter ore and the manganese-iron ore of the blast furnace can be saved.
3. The iron-manganese composite pellet ore is used for blast furnace smelting, and the recovery rate of manganese is improved by 20 percent compared with the direct use of manganese ore blocks and iron ores containing manganese.
4. Solves the problem of resource shortage of ferromanganese ore.
5. Improves the economic benefit of enterprises, and can increase profit by 7 yuan for one ton of iron.
6. Can improve the economic index of blast furnace smelting technology.
Embodiment 1,
Production examples of iron-manganese composite pellets used for smelting group III manganese cast pig iron in a blast furnace:
The raw pellets and the mixture are prepared according to the proportion of 95.7 percent of iron fine powder, 2 percent of bentonite and 2.3 percent of manganese ore powder, are mixed in a cylinder mixer with phi of 2.8x6m, are pelletized in a pelleting disc with the diameter of 4.2 m, and are dried on a shaft kiln drying bed with the diameter of 8 m 2 through a rolling screen and a cloth, and no abnormal phenomenon is found in the drying and roasting processes compared with the raw oxidized pellets. The chemical composition of raw materials, the granularity composition of raw materials, the thermal system of roasting and the strength of pellets of the iron-manganese composite pellets are shown in tables 1,2 and 3 respectively.
Example two
Taking iron-manganese composite pellets as raw materials, smelting III group manganese cast pig iron (Mn0.9-1.30%) by a blast furnace:
The total of 4625.6 tons of group III manganese cast pig iron 355 furnaces are smelted in a 100 m 3 blast furnace, all the manganese cast pig iron are qualified, the components of the pig iron are stable, and the blast furnace production is normal. The blast furnace ore feeding components and the main technical indexes of the blast furnace are shown in tables 4, 5-1 and 5-2.
TABLE 1 raw materials chemical composition table of iron-manganese composite pellet
TABLE 2 raw material particle size composition Table for iron-manganese composite pellets
Table 3 table of hot working degree and strength of iron-manganese composite pellet and raw iron ore pellet shaft furnace roasting
TABLE 4 blast furnace charging mineral composition Table
TABLE 5-1 Main technical index comparison Table for blast furnace
TABLE 5-2 Main technical index comparison Table for blast furnace
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87101376.2A CN1003864B (en) | 1987-08-29 | 1987-08-29 | Blast furnace smelting method of manganese-rich slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87101376.2A CN1003864B (en) | 1987-08-29 | 1987-08-29 | Blast furnace smelting method of manganese-rich slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1031719A CN1031719A (en) | 1989-03-15 |
| CN1003864B true CN1003864B (en) | 1989-04-12 |
Family
ID=4813368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87101376.2A Expired CN1003864B (en) | 1987-08-29 | 1987-08-29 | Blast furnace smelting method of manganese-rich slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003864B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100335663C (en) * | 2004-11-21 | 2007-09-05 | 马鞍山中冶钢铁冶金科技实业有限公司 | Pyrolusite blocks and production thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660041B (en) * | 2009-08-11 | 2010-11-24 | 河南德海源诚矿业有限公司 | Method for manufacturing MgO acid pellets by using molybdenum slag |
| CN101775452B (en) * | 2010-02-02 | 2011-04-20 | 河北龙凤山铸业有限公司 | Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron |
| CN103993117B (en) * | 2014-05-30 | 2016-03-09 | 苏州大学 | A kind of method based on preparing manganeisen from low grade manganese mine |
| CN110295261B (en) * | 2019-07-20 | 2021-05-18 | 武钢集团昆明钢铁股份有限公司 | Smelting method of high-manganese steel-making molten iron |
| CN113981210A (en) * | 2021-10-29 | 2022-01-28 | 吉铁铁合金有限责任公司 | Production process for producing manganese series ferroalloy by roasting manganese ore |
-
1987
- 1987-08-29 CN CN87101376.2A patent/CN1003864B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100335663C (en) * | 2004-11-21 | 2007-09-05 | 马鞍山中冶钢铁冶金科技实业有限公司 | Pyrolusite blocks and production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1031719A (en) | 1989-03-15 |
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