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Iron extracting process of lead and zinc residues treated through rotary hearth furnace

A technology of lead-zinc slag and rotary hearth furnace, which is applied in the field of metallurgy, can solve the problems of environmental pollution, resource waste, and large land occupation, and achieve the effects of short process flow, high recovery rate, and comprehensive utilization

Active Publication Date: 2017-01-11
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main constituent elements of this type of slag are Fe, Zn, and Pb. In addition, some slag also contains a large amount of rare and precious metal indium, etc. If it is not treated, it will occupy a large amount of land for stockpiling, resulting in a huge waste of resources. The heavy metal ions in the water will seep into the soil and groundwater with the rain, causing serious environmental pollution

Method used

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  • Iron extracting process of lead and zinc residues treated through rotary hearth furnace

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Effect test

Embodiment 1

[0024] Embodiment 1 Rotary hearth furnace treatment lead-zinc slag iron extraction process

[0025] The annual processing capacity of the project is 200,000 tons of lead-zinc slag (dry basis), with a moisture content of 10%. The main components of lead-zinc slag are shown in Table 1:

[0026] Table 1 Chemical multi-element analysis of lead-zinc slag

[0027] TF Fe 2 o 3

SiO 2

Al 2 o 3

CaO MgO S P Ag Pb Zn Cl 22.01 32.17 4.675 1.695 3.615 0.908 13.07 0.091 0.013 2.78 3.1 0.02

[0028] Rotary hearth furnace is used for direct reduction smelting, which requires 5,000 tons of bentonite, 7,000 tons of liquid binder and 50,000 tons of coal powder per year.

[0029] 1) Batching - compaction: take lead-zinc slag, reducing agent and additives according to the proportion for batching, fully mix, press into agglomerates, and dry at 200°C to obtain dry agglomerates; among them, the additives are bentonite and liquid binder ...

Embodiment 2

[0036] Embodiment 2 Rotary hearth furnace treatment of lead-zinc slag iron extraction process

[0037] The annual processing capacity of the project is 200,000 tons of lead-zinc slag (dry basis), with a moisture content of 10%. The main components of lead-zinc slag are shown in Table 4:

[0038] Table 4 Chemical multi-element analysis of lead-zinc slag

[0039] TF Fe 2 o 3

SiO 2

Al 2 o 3

CaO MgO S P Ag Pb Zn Cl 22.01 32.17 4.675 1.695 3.615 0.908 13.07 0.091 0.013 2.78 3.1 0.02

[0040] Rotary hearth furnace is used for direct reduction smelting, and 20,000 tons of bentonite, 4,000 tons of liquid binder are required to be added every year, and 30,000 tons of coal powder are consumed.

[0041] 1) Batching - compaction: take lead-zinc slag, reducing agent and additives according to the proportion for batching, mix thoroughly, press into agglomerates, and dry at 30°C to obtain dry agglomerates; among them, the addi...

Embodiment 3

[0048] Embodiment 3 rotary hearth furnace treatment lead-zinc slag iron extraction process

[0049] The annual processing capacity of the project is 200,000 tons of lead-zinc slag (dry basis), with a moisture content of 10%. The main components of lead-zinc slag are shown in Table 7:

[0050] Table 7 Chemical multi-element analysis of lead-zinc slag

[0051] TF Fe 2 o 3

SiO 2

al 2 o 3

CaO MgO S P Ag Pb Zn Cl 22.01 32.17 4.675 1.695 3.615 0.908 13.07 0.091 0.013 2.78 3.1 0.02

[0052] Rotary hearth furnace is used for direct reduction smelting, and 8,000 tons of bentonite, 10,000 tons of liquid binder and 70,000 tons of pulverized coal are required to be added every year.

[0053]1) Batching-pressing: Take lead-zinc slag, reducing agent and additives according to the proportion for batching, fully mix, press into agglomerates, and dry at 115°C to obtain dry agglomerates; among them, the additives are bentonite an...

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Abstract

The invention discloses an iron extracting process of lead and zinc residues treated through a rotary hearth furnace. The process comprises the following steps of (1) burdening-briquetting, (2) direct reduction of the rotary hearth furnace and (3) DRI block mass ore grinding magnetic separation. The invention further discloses iron powder prepared and obtained through the process. The invention further discloses application of the iron powder. Method design is reasonable; operation is easy; metallic iron in the lead and zinc residues can be effectively extracted; the problem of resource waste and the environmental problem caused by industrial waste residue abandoning are avoided; environment protection is facilitated; and good economic benefits, social benefits and environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a process for extracting iron from lead-zinc slag treated in a rotary hearth furnace. Background technique [0002] my country is the world's largest steel producer. In 2015, the steel output exceeded 800 million tons, and the annual demand for scrap steel was more than 82 million tons, and the demand for reduced iron was 5 million tons. my country's annual import of reduced iron is 3 million tons, while the annual output of reduced iron (sponge iron) is only 600,000 tons. At the same time, the rapid development of the world's iron and steel industry and the increasing attention of the international community to environmental protection, coupled with the combined effects of the shortage of resources such as iron ore, scrap steel, and coke, and the sharp rise in the price of natural gas, have made the production costs of various iron and steel enterprises higher and...

Claims

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Application Information

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IPC IPC(8): C22B1/244C22B7/04
CPCC22B1/2406C22B1/244C22B7/001C22B7/04Y02P10/20
Inventor 郭锐赵杰李韩璞刘许李淮东
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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