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Method for cooperative resourceful treatment of lead-zinc smelting slag and ferrous sulfate slag

A technology for smelting slag and jarosite slag is applied in the field of collaborative resource treatment of lead-zinc smelting slag and jarosite slag, which can solve the problems of dangerous solid waste accumulation of jarosite slag, high energy consumption of the treatment process, and serious environmental pollution. Achieve the effect of eliminating SO2 pollution, simple operation and low energy consumption

Active Publication Date: 2020-04-10
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of high energy consumption, serious environmental pollution, difficult disposal of kiln slag and dangerous solid waste accumulation of alum slag in the existing traditional pyroprocessing process of lead-zinc smelting slag; the purpose of the present invention is to provide a Alum slag is used as a roasting additive for lead-zinc smelting slag, using the sulfur resources of the slag to selectively convert lead and zinc in the slag and slag into sulfides, and at the same time reduce the iron compounds in the slag to metallic iron , so that it is easy to realize the method of separation and recovery of lead, zinc and iron through conventional flotation and magnetic separation. This method not only separates and recovers valuable metals such as lead, zinc, and iron, but also the tailings can be directly used as building materials. Converted to metal sulfides and efficiently immobilized, avoiding SO 2 The overflow of gas, thus realizing the clean disposal of alumina slag and the comprehensive recovery of resources of lead-zinc smelting slag

Method used

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  • Method for cooperative resourceful treatment of lead-zinc smelting slag and ferrous sulfate slag
  • Method for cooperative resourceful treatment of lead-zinc smelting slag and ferrous sulfate slag
  • Method for cooperative resourceful treatment of lead-zinc smelting slag and ferrous sulfate slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The iron-vanadium slag used in this embodiment is the jarosite slag produced by a certain zinc smelter in Chenzhou, and its specific components are shown in Table 1.

[0035] The main chemical composition / % of table 1 jarosite slag

[0036]

[0037] The zinc smelting slag used in this example is zinc smelting low-acid leaching slag, and its specific composition is shown in Table 2. 86% of the zinc in the zinc leaching slag exists in the form of zinc ferrite.

[0038] Table 2 Main chemical composition / % of zinc leaching slag

[0039]

[0040] A method for synergistically self-sulfiding roasting of auxinite slag and lead-zinc smelting slag, the specific steps are as follows:

[0041] (1) above-mentioned jarosite slag, zinc leach slag and the coke that particle size is 80% less than 5mm are mixed with mass ratio as 100:60:20;

[0042] (2) Take 150 kg of the above-mentioned mixed sample and place it in a self-made rotary kiln, pass nitrogen gas as a protective gas, ...

Embodiment 2

[0060] The vulcanizing agent used in this example is jarosite slag produced by a zinc smelter in Zhuzhou, and its specific chemical composition is shown in Table 5.

[0061] The main chemical composition / % of table 5 jarosite slag

[0062]

[0063] The steel mill zinc-containing smoke and dust used in this embodiment is the blast furnace dust produced by a certain steelmaking plant in Hunan. The particle size of the material is 75% less than 0.074mm. It exists with zinc ferrite, and iron exists in the form of ferric oxide, ferric silicate and ferric oxide.

[0064] Table 6 Main chemical components of soot from steel mills / %

[0065]

[0066] A method for synergistically self-sulfiding roasting of auxinite slag and lead-zinc smelting slag, the specific steps are as follows:

[0067] (1) above-mentioned jarosite slag, zinc leach slag and the coke that particle size is 80% less than 5mm are mixed with mass ratio as 100:75:40;

[0068] (2) Take 150 kg of the above-mention...

Embodiment 3

[0086] The jarosite slag and zinc ferrite slag used in this embodiment have specific chemical compositions shown in Table 5 and Table 2, respectively.

[0087] A method for synergistically self-sulfiding roasting of auxinite slag and lead-zinc smelting slag, the specific steps are as follows:

[0088] (1) above-mentioned jarosite slag, zinc leach slag and the coke that particle size is 80% less than 5mm are mixed with mass ratio as 100:80:40;

[0089] (2) Take 150 kg of the above-mentioned mixed sample and place it in a self-made rotary kiln, feed nitrogen gas as a protective gas, and roast at 1000 ° C for 120 min.

[0090] (3) Slowly cool and crystallize the calcined product at a cooling rate of 5°C / min, and cool down to room temperature naturally after dropping to 500°C.

[0091] (4) Sampling and analyzing the content of lead, zinc sulfide and iron in the roasted sample, and calculating the sulfur fixation rate, the sulfurization rate of lead and zinc and the reduction rate...

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Abstract

The invention discloses a method for cooperative resourceful treatment of lead-zinc smelting slag and ferrous sulfate slag. According to the method, lead-zinc smelting slag, ferrous sulfate slag and acarbonaceous reducing agent are evenly mixed and pressed into balls, the balls are roasted, roasting melt is subjected to slow cooling and crystallizing, and roasting products including metal iron and lead-zinc sulfide are obtained; and the roasting products are subjected to flotation to recover lead-zinc sulfide concentrates, and flotation tailings are subjected to magnetic separation to recoveriron ore concentrates. By means of the method, ferrous sulfate slag and lead-zinc smelting slag are cooperatively treated, sulfur in ferrous sulfate slag is efficiently fixed, SO2 gas overflowing isavoided, meanwhile, lead, zinc and the like in waste slag is vulcanized into heavy metal sulfide, iron is reduced into metal iron, and therefore lead-zinc sulfide and iron can be separated and recovered through the conventional flotation and magnetic separation methods; and the method has the advantages of being moderate in process condition, green, environment-friendly, simple in operation, low in cost and the like, and the problem of environment pollution caused by treatment of the prior art to ferrous sulfate slag and lead-zinc smelting slag can be solved.

Description

technical field [0001] The invention relates to a method for synergistic treatment of lead-zinc smelting slag and jarosite slag, in particular to a method for using jarosite slag as a roasting additive for lead-zinc smelting slag, and selectively separating the lead-zinc and iron compounds in the two smelting slags. It is converted into lead-zinc sulfide and metal iron, so that lead-zinc and metal iron can be separated and recovered by conventional flotation and magnetic separation methods, and belongs to the technical field of non-ferrous metal beneficiation and metallurgy. Background technique [0002] my country is a major producer and consumer of lead and zinc. In 2015, the output of lead and zinc in my country was 3.989 million tons and 6.217 million tons respectively, accounting for more than 40% of the world's total output. At present, my country's hydro-smelting zinc production capacity accounts for about 85% of the national annual zinc production capacity. The hydro...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/248C22B1/02C22B1/26C21B13/00C22B13/02C22B19/30
CPCC22B1/02C22B1/2406C22B1/248C22B1/26C22B7/001C22B7/002C22B7/04C22B13/025C22B19/30Y02P10/20
Inventor 韩俊伟刘维覃文庆张添富杨聪人焦芬邬桂婷
Owner CENT SOUTH UNIV
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