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Method for recovering mercury from nonferrous metallurgy low-mercury acid mud by adopting wet process technology

A technology of acid mud and technology, applied in the field of resource technology application, can solve the problems of secondary pollution, mercury vapor entering the atmosphere, etc.

Inactive Publication Date: 2021-09-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mercury smelting by fire method may cause mercury to volatilize into mercury vapor and enter the atmosphere, resulting in hidden danger of secondary pollution

Method used

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  • Method for recovering mercury from nonferrous metallurgy low-mercury acid mud by adopting wet process technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The mercury element content in acid mud is 0.96%.

[0045]Take 50g of low-mercuric acid mud, and after drying, weigh 41.395g of dried acid mud, grind it to a particle size of about 200 mesh, and place the acid mud particles evenly in a beaker. Configure concentrated hydrochloric acid, take 320ml of analytically pure concentrated hydrochloric acid with a concentration of 36% and place it in a 1000ml volumetric flask, take 500ml of UP water and add it to the volumetric flask to dilute the concentrated hydrochloric acid. Configure 1mol / L sodium hydroxide solution to titrate the concentration of concentrated hydrochloric acid. After titration, the concentration of concentrated hydrochloric acid was 127g / L. Add 85ml of concentrated hydrochloric acid into the beaker according to the mass ratio of acid mud to concentrated hydrochloric acid volume ratio of about 1:1.7. According to the dosage of sodium chlorate is twice the mercury content in the acid mud, weigh 8g of sodium ...

Embodiment 2

[0050] The mercury content in acid mud is 0.79%.

[0051] Take 50g of low-mercuric acid mud, after drying, weigh 40.84g of acid mud with a dry weight, grind it to a particle size of about 200 mesh, and place the fine particles of acid mud evenly in a beaker. Adopt the concentrated hydrochloric acid of embodiment 1 same concentration. Add 85ml of concentrated hydrochloric acid to the beaker according to the volume ratio of acid mud to concentrated hydrochloric acid 1:1.7, and add 4g of sodium chlorate to the beaker according to the dosage of sodium chlorate is 4 times the mercury content in the acid mud. The reaction was stirred at a room temperature of 25° C. at a rotational speed of 350 r / min. React for six hours, after complete reaction, let stand to settle. After centrifugation and filtration, the mass of lead and silver slag obtained by filtration was 50.2240g. After drying, the quality of dry lead and silver slag was 40.3801g, and the moisture content was 19.6%. The per...

Embodiment 3

[0056] The Hg content in low mercury acid mud is about 0.5%.

[0057] Acid leaching with sodium chlorate hydrochloride system: firstly dry and grind the low mercury acid mud to a particle size of 150 mesh, add hydrochloric acid with a concentration of 120g / L to the low mercury acid mud, add low mercury acid mud and hydrochloric acid The ratio of the amount is 1(g): 1.7(ml). After adding hydrochloric acid, add sodium chlorate, wherein the amount of sodium chlorate added is twice the mercury content in the acid mud; after adding all the medicines, stir Make the reaction fully, the stirring speed is 300r / min, the reaction time is 4 hours, filter to obtain lead and silver slag and leaching solution; repeat step S1 once to increase the concentration of mercury in the leaching solution.

[0058] Reduction of selenium precipitation: Slowly add a reducing agent to the obtained leaching solution, and the dosage ratio is 1.2:1 (mass ratio) of reducing agent: selenium. The reducing agent...

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Abstract

The invention discloses a method for recovering mercury from a nonferrous metallurgy low-mercury acid mud by adopting a wet process technology, the mercury in a acid mud is extracted by adopting the wet process technology in the whole process by carrying out component analysis on a low-mercury acid mud generated in a nonferrous metallurgy industry, so that a purpose of recovering the mercury is achieved. The technological process comprises the steps of acid leaching of a sodium chlorate hydrochloride system, centrifugal separation, reduction selenium deposition, reduction copper and bismuth removal and reduction mercury deposition. According to the method for recovering the mercury from the nonferrous metallurgy low-mercury acid mud by adopting the wet process technology, process design is reasonable, the properties of various chemical elements and compounds thereof in different condition states are fully utilized, extraction and recovery of the mercury in the low-mercury acid mud are realized, extraction and separation of lead, silver, selenium, copper, bismuth and other elements are also realized, and high economic benefits are provided. The method is environment-friendly and high in utilization rate of each part of resources, and has industrial application value.

Description

technical field [0001] The invention belongs to the application field of resource technology, and in particular relates to a method for recovering mercury from non-ferrous smelting low-mercury acid mud by using wet technology. Background technique [0002] Low mercury acid mud is a reusable hazardous waste at the end of the process produced in non-ferrous smelting, mainly from the smelting process of copper ore, lead ore, zinc-germanium ore, and tin ore. Since most of the concentrate contains mercury and sulfur, in the process of refining other colored elements, mercury and sulfur remain in the tailings, forming low mercury acid mud. Low mercury acid sludge is a hazardous waste that requires special technical disposal. [0003] Most of the existing technologies for mercury-containing acid mud are pyrometallurgical mercury refining, and only have a good recovery rate for high-mercury acid mud with high content. Mercury smelting by pyrotechnics may cause mercury volatilizati...

Claims

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Application Information

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IPC IPC(8): C22B43/00C22B7/00C22B15/00C22B30/06C01B19/02
CPCC22B43/00C22B7/007C22B15/0089C22B30/06C01B19/02Y02P10/20
Inventor 潘学军沙漠陈波
Owner KUNMING UNIV OF SCI & TECH
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