Method for comprehensively recycling zinc-rich gypsum slag resources

A gypsum slag and zinc-enriched technology, which is applied to the improvement of process efficiency, magnesium/calcium/strontium/barium sulfide/polysulfide, flotation, etc., can solve the problem of inability to realize valuable metal recovery and zinc sulfide flotation recovery Poor effect, high equipment investment and operating costs, etc., to achieve the effect that is conducive to industrial production, mild process conditions, and simple operation

Active Publication Date: 2020-04-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN 201010183293 uses sulfur as a vulcanizing agent, and reacts for 1.5 to 4.5 hours at an autoclave reaction temperature of 160 to 240°C with an added amount of sulfur of 12% to 20%, and the vulcanization rate of zinc in the neutralization slag is higher than 90%. However, due to the fine particles of zinc sulfide obtained by hydrothermal vulcanization, the flotation recovery effect of zinc sulfide is relatively poor. In addition, the hydrothermal vulcanization method requires expensive high-pressure reactors and additional sulfur as a vulcanizing agent, which requires high equipment investment and operating costs.
[0005] Harmless disposal methods mainly include cemen

Method used

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  • Method for comprehensively recycling zinc-rich gypsum slag resources
  • Method for comprehensively recycling zinc-rich gypsum slag resources
  • Method for comprehensively recycling zinc-rich gypsum slag resources

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The zinc-containing gypsum slag used in this example comes from a large-scale zinc smelter in Zhuzhou, and its specific components are shown in Table 1. The main components of the neutralized slag are dihydrate, calcium sulfate and zinc hydroxide, and the content of calcium sulfate dihydrate is 65.6%. The zinc hydroxide content is 18.3%.

[0047] Main chemical composition / % of the slag in Table 1

[0048]

[0049] The zinc smelting sewage acid used in this example comes from a zinc-zinc smelting plant in Hengyang, Hunan, and its specific composition is shown in Table 2.

[0050] Table 2 Main Components of Zinc Smelting Sewage Acid / (mg / L)

[0051]

[0052] A method for comprehensive recovery of zinc-rich gypsum slag resources, the specific steps are as follows:

[0053] (1) Take 3000kg of the above-mentioned naturally air-dried gypsum slag and 450kg of coke powder with a particle size of 80% less than 1mm and mix them evenly. The feed rate of the machine and the...

Embodiment 2

[0067] The zinc-containing gypsum slag used in this example comes from a large-scale zinc smelter in Qujing, Yunnan, and its specific composition is shown in Table 3. The main components of the neutralized slag are dihydrate, calcium sulfate and zinc hydroxide, and the content of calcium sulfate dihydrate is 87.5%. , the content of zinc hydroxide is 8.63%.

[0068] Main chemical composition / % of the slag in table 3

[0069]

[0070] The zinc smelting sewage acid used in this example comes from a zinc-zinc smelting plant in Chenzhou, Hunan, and its specific composition is shown in Table 4.

[0071] Table 4 Main Components of Zinc Smelting Sewage Acid / (mg / L)

[0072]

[0073] A method for comprehensive recovery of zinc-rich gypsum slag resources, the specific steps are as follows:

[0074] (1) get above-mentioned naturally air-dried gypsum slag 3000kg and 300kg particle size and be that 80% are less than 1mm wood charcoal powder mixing, the material after above-mentioned...

Embodiment 3

[0088] The zinc-containing gypsum slag used in this example comes from a large-scale zinc smelter in Zhuzhou, and its specific components are shown in Table 1.

[0089] The zinc smelting sewage acid used comes from a zinc-zinc smelter in Hengyang, Hunan, and its specific composition is shown in Table 2.

[0090] A method for comprehensive recovery of zinc-rich gypsum slag resources, the specific steps are as follows:

[0091] (1) Take 3000kg of the above-mentioned naturally air-dried gypsum slag and 600kg of coke powder with a particle size of 80% less than 1mm and mix them evenly. The feed rate of the machine and the belt speed of the steel belt furnace ensure that the thickness of the material layer is 10-20cm. Nitrogen is introduced to control the running speed of the steel belt and the furnace temperature so that the material is heated at a constant temperature of 850°C for 60 minutes, and the roasted sample is cooled to Take it out after room temperature; through chemica...

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Abstract

The invention discloses a method for comprehensively recycling zinc-rich gypsum slag resources. The method comprises the steps that reduction vulcanization roasting is carried out on zinc-rich gypsumslag and a carbonaceous reducing agent to obtain a roasting product containing calcium sulfide and zinc sulfide, a neutralizing reaction is conducted on the roasting product and zinc smelting acidic wastewater, hydrogen sulfide gas is recycled, and secondary gypsum slag and neutralized liquid are obtained; zinc sulfide concentrate is recycled from the secondary gypsum slag through a flotation method; and reduction roasting is conducted on flotation tailings to obtain a calcium sulfide product. According to the method, comprehensive recycling and utilizing of calcium, zinc and sulfur resourcesin the zinc-rich gypsum slag can be effectively achieved, the whole process is free of generation of secondary waste residues, the energy consumption is low, environmental friendliness is achieved, and the method has good application and popularization prospects.

Description

technical field [0001] The invention relates to a method for comprehensive recovery of zinc-rich gypsum slag resources, in particular to a method for comprehensive recovery of zinc-sulfur resources in zinc-rich gypsum slag by combining reduction sulfidation roasting and flotation, and belongs to the technical field of non-ferrous metal beneficiation and metallurgy. Background technique [0002] my country is a big country of zinc production and consumption. In 2015, my country's zinc metal production was 6.217 million tons, accounting for more than 40% of the world's total production. At present, 85% of my country's zinc is produced by "boiling roasting-two-stage leaching-purification and impurity removal-electrodeposition "Craft. During the boiling roasting stage, a large amount of zinc-containing dust along with SO 2 Flue gas enters the flue, in order to meet the requirements of acid production, SO 2 The flue gas needs to be washed and purified to remove harmful component...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B7/04C01B17/42B03D1/00
CPCB03D1/00C01B17/42C22B1/02C22B7/04Y02P10/20
Inventor 韩俊伟刘维张添富覃文庆焦芬杨聪仁
Owner CENT SOUTH UNIV
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