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Method of synergistically vulcanizing and roasting lead-zinc smelting slag and gypsum slag

A technology of smelting slag and gypsum slag, which is applied in the direction of solid separation and flotation, can solve the problems of gypsum slag dangerous solid waste accumulation, high energy consumption of the treatment process, and difficult disposal of kiln slag, and achieves comprehensive recycling of clean and co-processing, The effect of eliminating SO2 pollution and facilitating subsequent recovery and disposal

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

[0004] In order to solve the problems of high energy consumption, serious environmental pollution, difficult disposal of kiln slag and dangerous solid waste accumulation of gypsum slag in the existing pyroprocessing process of lead-zinc smelting slag; the purpose of the present invention is to provide a clean and efficient A method for the co-processing of lead-zinc smelting slag and gypsum slag. In this method, gypsum slag is used as a vulcanizing agent, and the heavy metal oxides such as lead and zinc in the lead-zinc smelting slag and gypsum slag are selectively converted by reduction sulfidation roasting to easily flotation slag. The recovered sulfides are converted into low-melting compounds such as calcium ferrite and calcium silicate, and the arsenic volatilizes and enriches in the dust; the enrichment of calcium ferrite and calcium silicate in the flotation tailings can be As a raw material and building material for cement manufacturing; the sulfur in the gypsum slag is converted into metal sulfide and fixed during the reduction sulfidation roasting process, avoiding SO 2 The release of arsenic is volatilized and enriched in the dust, thus realizing the clean disposal of gypsum slag and the comprehensive recovery of lead-zinc smelting slag resources

Method used

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  • Method of synergistically vulcanizing and roasting lead-zinc smelting slag and gypsum slag
  • Method of synergistically vulcanizing and roasting lead-zinc smelting slag and gypsum slag

Examples

Experimental program
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Embodiment 1

[0029] The vulcanizing agent used in this embodiment is the gypsum neutralization slag produced by the electrolytic cleaning solution of a certain zinc plant, and its specific components are shown in Table 1, and the main components of the neutralization slag are dihydrate and calcium sulfate, and contain 2.38% of arsenic;

[0030] Table 1 Main chemical composition / % of neutralized slag

[0031]

[0032]

[0033] The used lead-zinc smelting slag in the present embodiment is an acid leaching slag, and its specific components are shown in Table 2, and zinc mainly occurs in the form of zinc ferrite in this zinc leaching slag;

[0034] Table 2 Main chemical composition / % of zinc ferrite slag

[0035]

[0036] A method for synergistic sulfidation roasting of lead-zinc smelting slag and gypsum slag, the specific steps are as follows:

[0037] (1) getting above-mentioned 1000kg gypsum slag, 800kg zinc leaching slag and 300kg particle size respectively is that 80% is less than...

Embodiment 2

[0053] The vulcanizing agent used in this embodiment is the desulfurized gypsum slag produced by the flue gas acid-making process of a zinc smelter, and its specific components are shown in Table 5. The main components of the neutralized slag are dihydrate and calcium sulfate, and contain 0.18% of arsenic;

[0054] Table 5 Main chemical components / % of desulfurized gypsum slag

[0055]

[0056] The water-quenched slag used in this example is obtained from the zinc-containing slag produced during the reduction and smelting process of a blast furnace in a pyro-lead smelting plant in Henan, and is obtained by water quenching and quenching. , its specific composition is shown in Table 6, the water quenched slag zinc mainly occurs in the form of zinc silicate and zinc ferrite, and the lead mainly occurs in the form of metal lead and lead oxide;

[0057] Table 6 Main chemical composition / % of water quenched slag

[0058]

[0059]

[0060] A method for synergistic sulfidati...

Embodiment 3

[0077] The vulcanizing agent used in the present embodiment is the desulfurized gypsum slag produced during the acid-making process from flue gas in a zinc smelter, and its specific components are shown in Table 4. The zinc-containing soot from the steel mill used in the present embodiment is the output of a steelmaking plant in Hunan. The particle size of the material is 75% less than 0.074mm, and the material is small and can be used directly. Its specific components are shown in Table 9. The zinc of the material is mainly composed of zinc oxide, zinc silicate and zinc ferrite. Occurs in the form of ferric silicate and ferric tetroxide;

[0078] Table 9 Main chemical composition / % of soot from steel mills

[0079]

[0080] A method for synergistic sulfidation roasting of lead-zinc smelting slag and gypsum slag, the specific steps are as follows:

[0081] (1) getting above-mentioned 1000kg gypsum slag, 750kg zinc leaching slag and 250kg granularity respectively is that 80...

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Abstract

The invention discloses a method of synergistically vulcanizing and roasting lead-zinc smelting slag and gypsum slag. The method comprises the following steps of: mixing lead-zinc smelting slag, gypsum slag and a carbonaceous reducing agent for reducing sulfurization roasting, using the gypsum slag as a vulcanizing agent to directionally convert lead, zinc and other heavy metals in the lead-zinc smelting slag into metal sulfides easy for flotation separation, enabling calcium in the gypsum slag to react with iron and silicon compounds in the lead-zinc smelting slag to generate calcium ferriteand calcium silicate compounds which can be used for manufacturing building materials and cement, and enabling arsenic in the gypsum slag to be volatilized and enriched in smoke dust to be recycled. The method has the advantages of being low in energy consumption and environmentally friendly, can solve the problem of environmental pollution caused by existing gypsum slag and lead-zinc smelting slag treatment, and has good application and popularization prospects.

Description

technical field [0001] The invention relates to a method for synergistic treatment of lead-zinc smelting slag and gypsum slag, in particular to a method for directional conversion of lead, zinc and other heavy metals in lead-zinc smelting slag into flotation-recoverable slag by using gypsum slag as a vulcanizing agent through a reduction sulfide roasting method. The method of metal sulfide belongs to the field of non-ferrous metal beneficiation and metallurgy technology. Background technique [0002] my country is a major producer and consumer of lead and zinc. In 2015, my country's lead and zinc metal output was 3.989 million t and 6.217 million t respectively, accounting for more than 40% of the world's total output. At present, 85% of zinc in China adopts the process of "boiling roasting-two-stage leaching-purification and impurity removal-electrowinning". Since the zinc ferrite generated in the boiling roasting process is difficult to be dissolved in the leaching process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B19/00C22B13/00B03B1/00B03D1/00
CPCB03B1/00B03D1/00C22B1/02C22B13/00C22B19/00
Inventor 韩俊伟刘维覃文庆张添富焦芬杨聪仁
Owner CENT SOUTH UNIV
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