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Method for enriching iron by comprehensively utilizing steelmaking dust

A dust and enrichment technology, applied in the direction of improving process efficiency, can solve the problems of large output of three wastes, high energy consumption and high cost, and achieve the effect of improving recovery rate, reducing energy consumption and improving recovery.

Inactive Publication Date: 2019-03-29
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, the steelmaking dust is mixed with reducing agent, additives and water for vacuum roasting, combined with the degree of vacuum to reasonably control the temperature and rationally control the pickling process parameters, so that the iron content in the residual material is further improved, and the iron content in the guaranteed metal While the recovery rate of iron is high, the recovery rate of elemental zinc is improved, and the iron concentrate with iron content as high as 66.16% can be obtained, and the recovery rate of zinc is as high as 98.19%. Low cost, which reduces the cost of comprehensive utilization of steelmaking dust, and effectively solves the problems of high cost, heavy pollution, high energy consumption and large output of three wastes in the treatment of zinc-containing steelmaking dust in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for comprehensively utilizing steelmaking dust to enrich iron, including the following steps:

[0036] (1) After mixing steelmaking dust with reducing agent and water, press them into pellets; the reducing agent is coke powder; the steelmaking dust, reducing agent, additives and water are mixed according to the following proportions by weight: 100 parts of steel dust, 6 parts of reducing agent, and 0.4 parts of water; the pressing into pellets is to first mix the steelmaking dust, reducing agent, and water evenly, and then send them into a mold with a diameter of 20.01mm to form a ball; the pressing The pressure of pelletizing is 11MPa; before pressing into pellets, the steelmaking dust and reducing agent are mixed uniformly, and then sent to the grinder to grind into a powder with a mesh size of 80 mesh, and then water is added for mixing;

[0037] (2) Send the pellets of step (1) into a vacuum carbon tube furnace for vacuum roasting to obtain volatiles and residue...

Embodiment 2

[0042] A method for comprehensively utilizing steelmaking dust to enrich iron, including the following steps:

[0043] (1) After mixing steelmaking dust with reducing agent and water, press them into pellets; the reducing agent is coke powder; the steelmaking dust, reducing agent, additives and water are mixed according to the following proportions by weight: 100 parts of steel dust, 8 parts of reducing agent, and 0.7 parts of water; the compressed pellets are formed by first mixing the steelmaking dust, reducing agent, and water uniformly, and then sending them into a mold with a diameter of 30mm to form a ball; The pressure of the pellets is 19MPa; before the pellets are pressed, the steelmaking dust and reducing agent are mixed uniformly, and then sent to the grinder to grind into a powder with a mesh size of 120 meshes, and then water is added to mix evenly;

[0044] (2) Send the pellets of step (1) into a vacuum carbon tube furnace for vacuum roasting to obtain volatiles and r...

Embodiment 3

[0049] A method for comprehensively utilizing steelmaking dust to enrich iron, including the following steps:

[0050] (1) After mixing steelmaking dust with reducing agents, additives, and water, press them into pellets; the additive is boron trioxide; the reducing agent is coke powder; the steelmaking dust, reducing agent, and additives Mix with water in the following proportions by weight: 100 parts of steel-making dust, 8 parts of reducing agent, 2 parts of additives, and 0.5 part of water; the pressing into pellets is to first mix steel-making dust, reducing agent, additives, and water evenly Then, it is sent into a mold with a diameter of 21.06mm to be pressed into a ball; the pressure of the compressed pellet is 12MPa; before the pellet is compressed, the steelmaking dust and reducing agent are mixed uniformly, and then sent to the grinder to grind into a mesh. Powder with a particle size of 90 mesh, then add additives and water to mix evenly;

[0051] (2) Send the pellets ...

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PUM

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Abstract

The invention discloses a method for enriching iron by comprehensively utilizing steelmaking dust. The method includes the steps that steelmaking dust is fed into a vacuum carbon tube furnace for vacuum roasting to obtain solid residues, the solid residues are subjected to crushing and ball-milling and then put into a dilute acid solution for acid pickling, impurities in a residual iron phase areremoved, and finally high-grade iron concentrate is obtained by enrichment. According to the method, the steelmaking dust is subjected to vacuum roasting, temperature and pickling process parameters are reasonably controlled in combination with the vacuum degree, finally, the iron content in residual materials is further increased, the recovery rate of elemental zinc is increased while the high recovery rate of metallic iron is ensured, the iron concentrate with the iron content up to 66.16% is obtained, and the recovery rate of zinc is up to 98.19%; the process is simple, the operation is convenient, the reaction temperature is low, the cost of comprehensive utilization of the steelmaking dust is reduced, and the problems of high cost, heavy pollution, high energy consumption and large three-waste output in treatment of zinc-containing steelmaking dust in the prior art are effectively solved.

Description

Technical field [0001] The invention relates to the technical field of secondary utilization of resources, in particular to a method for comprehensively utilizing steelmaking dust to enrich iron. Background technique [0002] With the high level of steel smelting output and the increasing attention of the country and steel companies to environmental protection, the comprehensive utilization of steel plant dust has become a research hotspot, which is also a worldwide problem. Steelmaking dust contains a large amount of CaO which makes it extremely difficult to recycle. Converter dust usually contains about 50% Fe and 14% CaO; stainless steel dust usually contains 15% CaO, 30% Fe, 8-15% Cr, and 1-8% Ni. Steel dust is rich in harmful elements such as Zn, K, Na, etc. If it is directly recycled and used in the steel production process without treatment, it will cause blast furnace nodules, spontaneous combustion of bag ash, and upturned tuyere damage, which will seriously harm steel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/00C22B7/02
CPCC22B1/00C22B1/02C22B7/02Y02P10/20
Inventor 徐本军黄润黄彩娟武庆慧吕晓东伍秦至
Owner GUIZHOU UNIV