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Technology for recycling nonferrous metals in process of treating lead-zinc slag through rotary hearth furnace

A non-ferrous metal, lead-zinc slag technology, applied in the field of metallurgy, can solve the problems of low comprehensive utilization rate of resources, secondary pollution of final slag, no solidification of heavy metal elements, etc. The effect of raw material cost

Inactive Publication Date: 2017-02-15
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the current method of processing lead-zinc slag recovers only one or a small amount of metals, and the comprehensive utilization rate of resources is low; at the same time, most of the heavy metal elements remaining in the slag treatment process have not been solidified, and the final slag produced has secondary secondary pollution

Method used

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  • Technology for recycling nonferrous metals in process of treating lead-zinc slag through rotary hearth furnace

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Process for recovering valuable metals from lead-zinc slag in rotary hearth furnace

[0029] The project processes 500,000 tons of lead-zinc slag (dry basis) annually, with a moisture content of 25%. The main components of lead-zinc slag are shown in Table 1:

[0030] Table 1 Chemical multi-element analysis of lead-zinc slag

[0031] name TFeSiO 2

Al 2 O 3

CaO MgOSP In Pb Zn Leaching residue23.3413.032.433.251.185.250.020.0347.1117.25

[0032] Rotary hearth furnace is used for direct reduction smelting, which requires 12,500 tons of bentonite, 17,500 tons of liquid binder and 98,000 tons of coal powder every year.

[0033] 1) Ingredients-briquetting: take the lead-zinc slag, reducing agent and additives according to the proportions, mix them thoroughly, press to form a dough, and dry at 200°C to obtain a dry agglomerate; where the additives are bentonite and liquid binder, The reducing agent is pulverized coal. The weight percentage of solid carbon in pulveri...

Embodiment 2

[0040] Example 2 Process for recovering valuable metals from lead-zinc slag in rotary hearth furnace

[0041] The project handles 500,000 tons of lead-zinc slag (dry basis) annually, with a moisture content of 20%. The main components of lead-zinc slag are shown in Table 4:

[0042] Table 4 Chemical multi-element analysis of lead-zinc slag

[0043] name TFeSiO 2

Al 2 O 3

CaO MgOSP In Pb Zn Leaching residue23.3413.032.433.251.185.250.020.0347.1117.25

[0044] Rotary hearth furnace is used for direct reduction smelting, which requires 5,000 tons of bentonite, 10,000 tons of liquid binder and 75,000 tons of coal powder every year.

[0045] 1) Ingredients-briquetting: take the lead-zinc slag, reducing agent and additives according to the proportions, mix them thoroughly, press them into a dough, and dry at 30°C to obtain a dry agglomerate; the additives are bentonite and liquid binder, The reducing agent is pulverized coal, the solid carbon content of the pulverized coal is 80% b...

Embodiment 3

[0052] Example 3 Process for recovering valuable metals from lead-zinc slag in rotary hearth furnace

[0053] The project processes 500,000 tons of lead-zinc slag (dry basis) annually, with a moisture content of 20%. The main components of lead-zinc slag are shown in Table 7:

[0054] Table 7 Chemical multi-element analysis of lead-zinc slag

[0055] name TFeSiO 2

Al 2 O 3

CaO MgOSP In Pb Zn Leaching residue23.3413.032.433.251.185.250.020.0347.1117.25

[0056] Rotary hearth furnace is used for direct reduction smelting, which requires 20,000 tons of bentonite, 25,000 tons of liquid binder and 175,000 tons of coal powder every year.

[0057] 1) Ingredients-briquetting: take the lead-zinc slag, reducing agent and additives according to the proportions, mix them thoroughly, press them into a dough, and dry at 30°C to obtain a dry agglomerate; the additives are bentonite and liquid binder, The reducing agent is pulverized coal, the solid carbon weight percentage in the pulverized...

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Abstract

The invention discloses a technology for recycling nonferrous metals in the process of treating lead-zinc slag through a rotary hearth furnace. The technology comprises the following steps that 1, ingredient preparation and briquetting are carried out; 2, direct reduction is carried out in the rotary hearth furnace; and 3, zinc oxide dust is recycled through a rotary hearth furnace dust collection system. The invention further discloses nonferrous metals prepared through the technology. By the adoption of the method of carrying out direct reduction in the rotary hearth furnace, synchronous enrichment and recycling of nonferrous metals in the lead-zinc slag are achieved, the lead and zinc volatilization rate reaches 90% or above, and the silver and indium volatilization rate reaches 80% or above; the rotary hearth furnace is easy to operate and high in heat utilization rate, meanwhile, the whole technological process is short, material adaptability is high, and comprehensive utilization of resources is achieved. Zinc oxide dust is smoke dust collected in the rotary hearth furnace dust collection system, the production cost is low, only the bagging cost, the transfer cost, the marketing cost and the like need to be input, and the price advantage is high.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a process for treating lead-zinc slag with a rotary hearth furnace to recover non-ferrous metals. Background technique [0002] With the vigorous development of the non-ferrous metal industry, the problem of smelting waste storage is becoming more and more serious. The current shortage of resources and the fragile environmental carrying capacity have become the two major bottlenecks restricting my country's economic development. At the same time, the rapid development of the world's steel industry and the increasing attention of the international community to environmental protection, coupled with the combined effects of resource shortages such as iron ore, scrap steel, coke, and the sharp rise in prices of natural gas, have made the production costs of enterprises higher and higher. Increasing the comprehensive utilization of solid waste resources is still the focus of ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/248C22B5/10C22B19/30C22B13/02C22B11/02C22B58/00
CPCC22B1/248C22B5/10C22B7/001C22B7/04C22B11/023C22B13/025C22B19/30C22B58/00Y02P10/20
Inventor 赵杰殷维贺山郭锐
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST