A method for synergistic vulcanization and roasting of 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 high energy consumption, environmental pollution, gypsum slag and dangerous solid waste accumulation in the treatment process, and achieve the effect of promoting growth and reducing costs

Active Publication Date: 2021-01-29
CENT SOUTH UNIV
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  • Claims
  • Application Information

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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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  • A method for synergistic vulcanization and roasting of lead-zinc smelting slag and gypsum slag
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  • A method for synergistic vulcanization and roasting of lead-zinc smelting slag and gypsum slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The vulcanizing agent used in this example is the gypsum neutralization slag produced by the electrolytic clean solution of a certain zinc factory. The specific components are shown in Table 1. The main components of the neutralization slag are dihydrate and calcium sulfate, containing 2.38% arsenic;

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

[0031]

[0032]

[0033] The lead-zinc smelting slag used in this example is acidic leaching slag, and its specific composition is shown in Table 2. Zinc in the zinc leaching slag mainly exists in the form of zinc ferrite;

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

[0035]

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

[0037] (1) Get above-mentioned 1000kg gypsum slag, 800kg zinc leaching slag and 300kg particle size respectively and be that 80% are less than 5mm coke mixing (mass ratio i...

Embodiment 2

[0053] The vulcanizing agent used in this example is the desulfurization gypsum slag produced in the flue gas acid washing process of a zinc smelter plant. The specific components are shown in Table 5. The main components of the neutralization slag are dihydrate and calcium sulfate, containing 0.18% arsenic;

[0054] Table 5 Main chemical composition of desulfurization gypsum slag / %

[0055]

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

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

[0058]

[0059]

[0060] A method for synergisti...

Embodiment 3

[0077] The vulcanizing agent used in this example is the desulfurized gypsum slag produced during the acid washing process of flue gas from a zinc smelter. blast furnace dust, the particle size of this material is 75% less than 0.074mm, and the material is fine and can be used directly. The specific composition is shown in Table 9. The zinc in this material is mainly zinc oxide, zinc silicate and zinc ferrite. Hematite, Exist in the form of iron silicate and ferric oxide;

[0078] Table 9 The main chemical components of steel plant dust / %

[0079]

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

[0081] (1) get the above-mentioned 1000kg gypsum slag, 750kg zinc leaching slag and 250kg particle size respectively and be that 80% are less than 5mm anthracite mixing (mass ratio is 100:75:25);

[0082] (2) Place the above-mentioned mixed sample on the steel belt furnace distribution mac...

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Abstract

The invention discloses a method for synergistic sulfidation and roasting of lead-zinc smelting slag and gypsum slag. In the method, lead-zinc smelting slag, gypsum slag and carbonaceous reducing agent are mixed for reduction sulfidation roasting, and gypsum slag is used as a vulcanizing agent to combine with lead Lead, zinc and other heavy metals in the zinc smelting slag are directional transformed into metal sulfides that are easy to be separated by flotation, and the calcium in the gypsum slag reacts with the iron and silicon compounds in the lead-zinc smelting slag to form calcium ferrite and calcium silicate compounds , can be used as building materials and cement manufacturing, and the arsenic in the gypsum slag is volatilized and enriched and recovered in the smoke. The method has the advantages of low energy consumption and environmental friendliness, can solve the problem of environmental pollution caused by the disposal of the existing gypsum slag and lead-zinc smelting slag, and has good prospects for popularization and application.

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 of using gypsum slag as a vulcanizing agent to realize the directional transformation of heavy metals such as lead and zinc in lead-zinc smelting slag into flotation-recoverable slag through reduction sulfidation roasting method The method for metal sulfide 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, 85% of the zinc in our country adopts the "boiling roasting-two-stage leaching-purification and impurity removal-electrodeposition" process. Since the zinc ferrite generated during the boiling roasting process is difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(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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