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Method for comprehensively recovering selenium, mercury, lead and silver from acid mud

A technology for recovering selenium and acid sludge, which is applied in the field of metallurgical acid sludge treatment, can solve the problems of waste of resources, failure to achieve comprehensive recovery of lead, selenium, and silver, etc., and achieve the effects of low output of waste acid, value enhancement, and environmental friendliness

Inactive Publication Date: 2020-11-13
CHUXIONG DIANZHONG NON FERROUS METALS LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing technology mainly focuses on the recovery of mercury, and involves little lead and selenium. Due to the interaction between lead, selenium and silver, the comprehensive recovery of lead, selenium and silver cannot be realized, which still causes waste of existing resources.

Method used

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  • Method for comprehensively recovering selenium, mercury, lead and silver from acid mud

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Mix 1000g of acid mud with 360g of sodium carbonate, place it in a reactor for leaching, wait to be heated to 30°C, the reaction time is 3h, the rotation speed is 200rpm, stop heating after leaching, filter and mechanically stir and wash to obtain sodium sulfate leaching solution and containing Selenium, lead and mercury slag; the sulfate solution is concentrated and crystallized to obtain sulfate; the selenium, lead, mercury and silver slag and dilute nitric acid are put into the reactor for leaching, and heated to 80°C, the reaction time is 2 hours, the speed is 250rpm, and the leaching is stopped. Heating, adding sodium chloride with the same molar weight as silver, fully stirring and filtering and washing to obtain lead leachate and selenium mercury residue respectively; lead solution and dilute sulfuric acid are put into a reactor to react to generate lead sulfate precipitation and dilute nitric acid, The regenerated dilute nitric acid is returned to continue leachi...

Embodiment 2

[0034] Mix 1000g of acid mud with 360g of sodium carbonate, place it in a reactor for leaching, wait to be heated to 30°C, the reaction time is 3h, and the rotation speed is 200rpm, stop heating after leaching, filter and wash with ultrasonic radiation, and obtain sodium sulfate leaching solution and containing Selenium, lead and mercury slag; the sulfate solution is concentrated and crystallized to obtain sulfate; the selenium, lead, mercury and silver slag and dilute nitric acid are put into the reactor for leaching, and heated to 80°C, the reaction time is 2 hours, the speed is 250rpm, and the leaching is stopped. Heating, adding sodium chloride in the same amount as the molar amount of silver, stirring fully and filtering and washing to obtain lead leachate and selenium mercury residue respectively; the lead solution and dilute sulfuric acid are put into the reactor to react to form lead sulfate precipitate and dilute Nitric acid, regenerated dilute nitric acid returns to c...

Embodiment 3

[0036] Mix 1000g of acid mud with 340g of ammonium carbonate, place it in a reactor for leaching, wait to be heated to 30°C, the reaction time is 3h, the rotation speed is 200rpm, stop heating after leaching, filter and mechanically stir and wash to obtain ammonium sulfate leaching solution and containing Selenium lead mercury slag; ammonium sulfate solution is concentrated and crystallized to obtain ammonium sulfate; selenium lead mercury slag and dilute nitric acid are put into the reactor for leaching, and heated to 80°C, the reaction time is 2h, the speed is 250rpm, and the heating is stopped after leaching is completed. , after filtering and washing, lead leaching solution and selenium mercury slag were obtained respectively; lead solution and dilute sulfuric acid were put into the reactor to react to generate lead sulfate precipitate and dilute nitric acid, and the regenerated dilute nitric acid was returned to continue leaching lead slag; adding sodium hypochlorite and su...

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Abstract

The invention relates to a method for comprehensively recovering selenium, mercury, lead and silver from acid mud, and belongs to the technical field of metallurgical acid mud treatment. The method comprises the steps that carbonate is added to subjected to phase transformation reaction with the acid mud to obtain a transformation solution and transformation slags; dilute acid is added to selectively leach the lead in the transformation slags, and sodium chloride is added after leaching to obtain lead-containing leachate and selenium-mercury-silver enriched slags correspondingly so as to realize separation of lead from the selenium, the mercury and the silver; an oxidizing agent and acid are added to chloridize and leach selenium-mercury enriched slags to obtain selenium-mercury leachate and silver-containing slags; sulfur dioxide is introduced into the selenium-mercury leachate for reduction, and crude selenium and a mercury-containing solution are obtained; sulfuric acid is added into the lead-containing leachate for a reaction to generate lead sulfate and the dilute acid, the dilute acid and the pure lead sulfate are obtained, and the dilute acid is recycled; and a vulcanizing agent is added into the mercury-containing solution for reaction to obtain mercury sulfide and vulcanized residual liquid. The method for comprehensively recovering the selenium, the mercury, the leadand the silver from the acid mud treats the smelting acid mud through a full-wet method, is low temperature and environmentally friendly, the mercury yield in the whole process is larger than 99.5%, the lead yield is larger than 95.0%, the selenium yield is larger than 98.0%, related treatment equipment is mature and easy to engineer, and the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of metallurgical acid mud treatment, and in particular relates to a method for comprehensively recovering selenium, mercury, lead and silver from acid mud. Background technique [0002] In order to effectively control mercury emissions in pyrometallurgical non-ferrous smelting enterprises, the flue gas is washed to form mercury-containing acid sludge. The mercury content of acid sludge produced by different non-ferrous metal smelting is different. One of the significant and common features is that it contains lead, selenium and mercury. Wait. If unreasonable technology is used to treat acid mud, it will easily cause mercury pollution to the environment, and it will also cause waste of rare and expensive mineral resources such as selenium and mercury in acid mud. Therefore, there is an urgent need to develop a method that can not only treat this acid sludge safely and environmentally friendly, but also effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00C22B11/00C22B43/00C01B19/02
CPCC22B7/007C22B13/045C22B11/042C22B43/00C01B19/02Y02P10/20
Inventor 刘大方范兴祥张宝辉舒波王家和周尚任军祥黄健光
Owner CHUXIONG DIANZHONG NON FERROUS METALS LLC
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