Method for comprehensively recovering mercury and selenium from metallurgical slag

A technology of metallurgical waste residue and mercury vapor, applied in the field of metallurgy, can solve the problems of environmental pollution, no comprehensive recovery of selenium and mercury, waste of resources, etc., and achieve the effect of low raw material cost

Inactive Publication Date: 2015-04-08
贵州重力科技环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Elemental selenium and selenium compounds are widely used in semiconductor materials with their excellent physical and chemical properties, and the market prospect is relatively broad; in the current technology, there is only a single method for reclaiming selenium, and there is no comprehensive method for reclaiming selenium and mercury, which not only causes resources waste and pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for comprehensively recovering mercury and selenium from metallurgical waste residues, comprising the steps of:

[0015] The mercury-containing selenate mud of copper smelters, with mercury content of 30% and selenium content of 40%, was crushed to about 140 μm, and the amount of quicklime added was about 30% of the metallurgical waste residue, and roasted at 900°C for 8 hours to obtain mercury-containing steam and Selenium slag; the mercury-containing vapor is first bagged and then cyclone dusted. The mercury vapor is condensed by the second-stage condensing equipment to obtain mercury, and the mercury soot ash and tail gas adsorption filler are returned to the metallurgical waste residue for reuse. The recovery rate of mercury reaches 98%. Oxidation solution leaching, the liquid-solid ratio is 2:1, Hg in the leaching solution 2+ , Fe 2+ , Ca 2+ , Mg 2+ The content was analyzed separately, and the sodium sulfide with the sum of each ion content 1:1 was use...

Embodiment 2

[0017] A method for comprehensively recovering mercury and selenium from metallurgical waste residues, comprising the steps of:

[0018] The molybdenum smelter contains mercury selenate mud, the mercury content is 7%, the selenium content is 30%, and it is crushed to 130 μm, and the amount of quicklime added is 10% of the metallurgical waste residue, and roasted at 800 ° C for 6 hours to obtain mercury-containing steam and selenium-containing residue ; The mercury-containing vapor is firstly bagged and then cyclone dust-collected, and the mercury vapor is condensed by a second-stage condensing device to obtain mercury. The recovery rate of mercury reaches 98%,

[0019] The selenium-containing slag is leached with an oxidation solution in which the amount of hydrochloric acid and sodium chlorate is 2:1, the liquid-solid ratio is 2:1, and the Hg in the leaching solution is 2+ , Fe 2+ , Ca 2+ , Mg 2+ , analyze its content separately, use sodium sulfide with the sum of each io...

Embodiment 3

[0021] A method for comprehensively recovering mercury and selenium from metallurgical waste residues, comprising the steps of:

[0022] The nickel smelter contains mercury-selenide mud, with mercury content of 20% and selenium content of 25%, crushed to about 150 μm, and the amount of quicklime added is about 20% of the metallurgical waste residue, and roasted at 750°C for 8 hours to obtain mercury-containing steam and Selenium slag: The mercury-containing vapor is first bagged and then cyclone dust-collected. The mercury vapor is condensed by a second-stage condensation device to obtain mercury, and the recovery rate of mercury reaches 99%.

[0023] The selenium-containing slag is leached with an oxidation solution in which the amount of hydrochloric acid and sodium chlorate is 2:1, the liquid-solid ratio is 2:1, and the Hg in the leaching solution is 2+ , Fe 2+ , Ca 2+ , Mg 2+ The content was analyzed separately, and the sodium sulfide with the sum of each ion content 1:...

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PUM

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Abstract

The invention discloses a method for comprehensively recovering mercury and selenium from metallurgical slag and belongs to the field of metallurgy. The method comprises following steps: grinding the metallurgical slag to the range of 130-150 microns, blending the metallurgical slag with quick lime accounting for 10-30% of the metallurgical slag and roasting at a temperature ranging from 750 to 900 DEG C for 6-8 hours; collecting dust from mercury-containing vapor firstly by use of a cloth bag and then by virtue of cyclone, condensing the mercury vapor by use of a two-stage condensation apparatus to recovery the mercury, and returning mercurial soot and a tail gas adsorption filler to the metallurgical slag for reutilization, wherein no pollutant is emitted in the process; next, leaching selenium-containing slag by use of an oxidation solution prepared from hydrochloric acid and sodium chlorate in the ratio of 2:1, analyzing the contents of Hg<2+>, Fe<2+>, Ca<2+> and Mg<2+> in the leachate in the liquid-solid ratio of 2:1, respectively, precipitating the ions by use of sodium sulfide in the ratio of 1:1 to the total content of the ions and then filtering to remove the irons, and reducing for 2 hours by use of hydroxylamine hydrochloride, thereby obtaining the elemental selenium after washing the precipitate. The method for comprehensively recovering mercury and selenium from the metallurgical slag is high in extraction rate and prone to industrial production.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for comprehensively recovering mercury and selenium from metallurgical waste residue. Background technique [0002] In recent years, with the rapid development of science and technology and the continuous expansion of production capacity, both mercury and selenium have been widely used in different industries due to their excellent characteristics. Mercury is used as a catalyst raw material for the production of PVC by the calcium carbide method. At present, the production capacity of the PVC industry continues to expand, and mercury resources are increasingly depleted. It is particularly important to extract mercury resources from metallurgical waste residues. Elemental selenium and selenium compounds are widely used in semiconductor materials with their excellent physical and chemical properties, and the market prospect is relatively broad; in the current techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B43/00C01B19/02
CPCY02P10/20
Inventor 王良栋李武斌张彬陈明慧
Owner 贵州重力科技环保股份有限公司
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