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Comprehensive utilization process of zinc-containing iron dust

A technology for dust, zinc and iron, which is applied in the field of comprehensive utilization of zinc and iron dust, can solve the problems of low product added value, high production cost, and many product powders, and achieves elimination of secondary pollution, convenient operation, and low content of harmful elements. Effect

Active Publication Date: 2012-07-04
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rotary hearth furnace method (Inmetco process) also has problems such as high product powder and low metallization rate, resulting in high production costs, dezincification rate is only 80%, and low product value.

Method used

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  • Comprehensive utilization process of zinc-containing iron dust
  • Comprehensive utilization process of zinc-containing iron dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A process for comprehensive utilization of zinc-containing iron dust, comprising the following steps:

[0030] The first step: making balls

[0031]The zinc, iron and carbon-containing dust removal ash, dust sludge and sulfuric acid slag produced by the steel plant are mixed and stirred evenly to obtain the first mixture. Then, according to the mass ratio of iron and carbon in the first mixture, press C / Fe=0.1 Add the first reduced coal and additives accounting for 10% of the total mass of the first mixed material to obtain the second mixed material; control the moisture (mass percentage) of the second mixed material to be 6%-8%, and then go through moistening, grinding and manufacturing Ball and sieve to obtain qualified raw balls with a diameter of 5-16mm;

[0032] The second step: metallization and sintering

[0033] First spread the sintered agglomerates with a particle size of 20-30mm on the belt sintering machine, then mix the second reduced coal and green balls...

Embodiment 2

[0035] A process for comprehensive utilization of zinc-containing iron dust, comprising the following steps:

[0036] The first step: making balls

[0037] The zinc, iron and carbon-containing dust removal ash, dust sludge and sulfuric acid slag produced by the steel mill are mixed and stirred evenly to obtain the first mixture, and then, according to the mass ratio of iron and carbon in the first mixture, according to C / Fe=0.25 Add the first reduced coal and additives accounting for 10% of the total mass of the first mixed material to obtain the second mixed material; control the moisture (mass percentage) of the second mixed material to be 6%-8%, and then go through moistening, grinding and manufacturing Ball and sieve to obtain qualified raw balls with a diameter of 5-16mm;

[0038] The second step: metallization and sintering

[0039] First spread the sintered agglomerate with a particle size of 20-30mm on the belt sintering machine, then mix the second reduced coal and ...

Embodiment 3

[0041] A process for comprehensive utilization of zinc-containing iron dust, comprising the following steps:

[0042] The first step: making balls

[0043] The zinc, iron and carbon-containing dust removal ash, dust sludge and sulfuric acid slag produced by the steel mill are mixed and stirred evenly to obtain the first mixture, and then, according to the mass ratio of iron and carbon in the first mixture, according to C / Fe=0.30 Add the first reduced coal and additives accounting for 10% of the total mass of the first mixed material to obtain the second mixed material; control the moisture (mass percentage) of the second mixed material to be 6%-8%, and then go through moistening, grinding and manufacturing Ball and sieve to obtain qualified raw balls with a diameter of 5-16mm;

[0044] The second step: metallization and sintering

[0045] First spread the sintered agglomerate with a particle size of 20-30mm on the belt sintering machine, then mix the second reduced coal and ...

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Abstract

The invention relates to a comprehensive utilization process of zinc-containing iron dust. The process comprises the steps of: uniformly mixing iron-containing dust mud, iron-containing dust, carbon-containing sludge, pyrite residue, first reducing coal and an additive, and carrying out moist grinding, pelletizing and screening to obtain qualified raw pellets; and then uniformly mixing the raw pellets with second reducing coal, carrying out downdraught drying and reduction roasting on a pellet sinter roasting machine to finish sintering of metallized pellets, carrying out nitrogen cooling to room temperature, and discharging to obtain the metallized pellet sintered ore. According to the invention, the process method is simple and convenient for operation; aiming at the characteristics of the zinc-containing iron dust in steel mill, high-efficiency utilization of iron, zinc, carbon and other valuable elements is realized by pelletizing and metallized roasting, and at the same time, harmful elements are removed and secondary pollution is eliminated; at the same time of removing the harmful elements, the zinc-containing iron dust is prepared into metallized pellet sintered blocks, and iron has high grade and low content of zinc, sulfur and other harmful elements, and can be used as a high-quality raw material to be directly entered into a blast furnace for smelting, therefore, the comprehensive utilization process plays an effect of reducing coke and increasing yield on the blast furnace and has significant economic benefits.

Description

Technical field: [0001] The invention discloses a comprehensive utilization process of zinc-containing iron dust, which belongs to the technical field of iron and steel metallurgy. Background technique [0002] my country is a big country of steel. Since 1996, when the steel output reached 100 million tons, it has been ranking first in the world. In 2010, the steel output was as high as 628 million tons. Domestically available iron resources are decreasing year by year, and the import volume of iron ore is increasing continuously. In 2010, the imported iron ore reached 630 million tons. At present, the ratio of iron ore imported by most iron and steel plants in the sintering mixture reaches more than 60%. . The severe shortage of iron ore resources has begun to affect the sustainable development and safety of my country's iron and steel industry. [0003] Zinc-containing iron dust is a by-product produced in the process of ironmaking and steelmaking in iron and steel plant...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/248
CPCY02P10/20
Inventor 朱德庆何光辉潘建朱远星李启厚王荣成何明杰王志远春铁军胡泽方黎剑平俞晓林
Owner CENT SOUTH UNIV
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