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Method of co-processing zinc-rich gypsum slag and jarosite slag

A co-processing and gypsum slag technology, applied in the direction of zinc sulfide, calcium carbonate/strontium/barium, etc., to achieve significant environmental benefits, mild process conditions, and simple operation

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

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Problems solved by technology

[0004] my country's zinc smelters produce a large amount of zinc-rich gypsum slag and jarosite slag every year, but there is no economical, green and feasible disposal method for resource utilization. Higher, and zinc-rich gypsum slag and jarosite slag are both produced in the zinc smelting system, so the development of a method of co-processing of zinc-rich gypsum slag and jarosite slag is the key to realize the green, clean and sustainable development of my country's zinc smelting industry Important Guarantee

Method used

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  • Method of co-processing zinc-rich gypsum slag and jarosite slag
  • Method of co-processing zinc-rich gypsum slag and jarosite slag
  • Method of co-processing zinc-rich gypsum slag and jarosite slag

Examples

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Embodiment 1

[0054] The zinc-rich gypsum slag and jarosite slag used in this example come from a large-scale zinc smelter in Zhuzhou, and their specific components are shown in Table 1 and Table 2 respectively. The main components of the zinc-rich slag are calcium sulfate dihydrate and zinc hydroxide, sulfuric acid dihydrate The calcium content is 65.6%, and the zinc hydroxide content is 18.3%.

[0055] Table 1 Main chemical composition / % of zinc-rich gypsum slag

[0056]

[0057] The main chemical composition / % of table 2 jarosite slag

[0058]

[0059] A method for the co-processing of zinc-rich gypsum slag and jarosite slag, the specific steps are as follows:

[0060] (1) Get the above-mentioned naturally air-dried zinc-rich gypsum slag 1000kg and 600kg of alumite slag and 400kg of coke powder with a particle size of 80% less than 1mm and mix evenly (gypsum slag: jarosite slag: coke powder is 100:60:50), Put the above mixed and briquetted material in a vacuum reduction furnace, ...

Embodiment 2

[0070] The zinc-containing gypsum slag used in this example comes from a large-scale zinc smelter in Qujing, Yunnan, and its specific components are shown in Table 3. The main components of the gypsum slag are dihydrate, calcium sulfate and zinc hydroxide, and the content of calcium sulfate dihydrate is 87.5%. The zinc hydroxide content is 8.63%, and the main components of the used jarosite slag are shown in Table 2.

[0071] Table 3 Main chemical composition / % of zinc-containing gypsum slag

[0072]

[0073] A method for the co-processing of zinc-rich gypsum slag and jarosite slag, the specific steps are as follows:

[0074] (1) getting the above-mentioned naturally air-dried zinc-rich gypsum slag 1000kg and 400kg of gypsum slag and 400kg of particle size is 80% less than 1mm pulverized coal mixing (gypsum slag: gypsum slag: pulverized coal is 100:40:40), Put the above-mentioned mixed and briquetted material in a vacuum reduction furnace, first roast at 400°C for 60 minut...

Embodiment 3

[0087] The main components of zinc-containing gypsum slag and jarosite slag used in this embodiment are shown in Table 1 and Table 2 respectively.

[0088] A method for the co-processing of zinc-rich gypsum slag and jarosite slag, the specific steps are as follows:

[0089] (1) get the above-mentioned naturally air-dried zinc-rich gypsum slag 1000kg and 800kg of gypsum slag and 600kg of particle size and mix evenly (gypsum slag: gypsum slag: pulverized coal is 100:80:60), Put the above-mentioned mixed and briquetted material in a vacuum reduction furnace, first roast at 400°C for 60 minutes to remove crystal water and free water in the material, and then reduce and sulfide roast at 1100°C for 90 minutes; the roasted sample is cooled to room temperature Take out after; Through chemical analysis, the result shows that the content of zinc, calcium sulfide, total sulfur and metallic iron in the zinc sulfide in the roasted sample is respectively 18.5%, 49.5%, 30.4% and 24.2%, and t...

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Abstract

The invention discloses a method of co-processing zinc-rich gypsum slag and jarosite slag, which comprises the following steps of: uniformly mixing the zinc-rich gypsum slag, the jarosite slag and a reducing agent, pressing into balls, putting the obtained balls into a reduction furnace, drying, pre-dehydrating, and then carrying out reduction vulcanization roasting to obtain a roasted material containing zinc sulfide, calcium sulfide and metal iron, mixing the roasted material with water, and acidifying in a three-phase fluidized bed by adopting hydrogen sulfide to obtain a calcium hydrosulfide solution and acidified slag, performing carbonation treatment on the calcium hydrosulfide solution to obtain a calcium carbonate product and hydrogen sulfide gas, and performing magnetic separationon the acidified slag to obtain iron ore concentrate, wherein magnetic separation tailings are zinc sulfide enriched slag. According to the method, calcium, zinc, sulfur and iron resources in the gypsum slag can be comprehensively recycled, secondary waste slag, waste gas and wastewater are not generated in the whole process, the method is environmentally friendly, full-quantitative utilization of the jarosite slag and the gypsum slag can be achieved, and the method has good application and popularization prospects.

Description

technical field [0001] The present invention relates to a method for co-processing zinc-rich gypsum slag and jarosite slag, in particular to a method for combining reduction sulfidation roasting, hydrogen sulfide acidification and magnetic separation to achieve zinc, sulfur, The method for comprehensive recovery of iron resources 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/24C22B19/00C22B26/20C01F11/18C01G9/08
CPCC01F11/18C01G9/08C22B1/02C22B1/2406C22B19/00C22B26/20
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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