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Method for recycling rare and precious metals from acid mud

A technology of rare precious metals and acid mud, applied in the direction of improving process efficiency, element selenium/tellurium, etc., can solve problems such as long process, large investment, unsatisfactory metal recovery rate, etc., and achieve the effect of reducing production costs

Active Publication Date: 2016-07-27
甘肃高能中色环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for recovering rare and precious metals from acid mud, so as to solve the problems of large investment, high energy consumption, unsatisfactory metal recovery rate and too long process in the prior art, and only a single metal can be extracted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The composition of acid mud is: Pb32.56%, Se5.66%, Bi2.38%, Cu3.62%, Au2.6g / t, Ag46.8g / t.

[0018] Acid mud pretreatment.

[0019] Add water to the acid mud for stirring and slurrying. The stirring time is 0.5 hours. The mass ratio of acid mud and water is 1:3, and the temperature is maintained at 25 degrees Celsius. a. Add water to filter residue A and stir for 0.5 hours. The mass ratio of filter residue A to water is 1:1. After the stirring is completed, filter the mud to obtain filtrate B and filter residue B. Filtrate B is mixed with filtrate A to obtain filtrate C.

[0020] Copper recycling.

[0021] Add ammonium sulfide or sodium sulfide in filtrate C until the blue color does not appear in filtrate C, wherein the reference amount of ammonium sulfide or sodium sulfide added is 1.1 times of the theoretical reaction amount. The reacted mixture is subjected to pressure filtration treatment, and the filter residue after pressure filtration is copper concentrate ri...

Embodiment 2

[0028] The acid mud composition is: Pb42.36%, Se2.36%, Bi3.28%, Cu4.32%, Au5.2g / t, Ag56.6g / t.

[0029] Acid mud pretreatment.

[0030] Add water to the acid mud for stirring and slurrying. The stirring time is 2.5 hours. The mass ratio of acid mud and water is 1:3, and the temperature is maintained at 65 degrees Celsius. a. Add water to filter residue A and stir for 2.5 hours. The mass ratio of filter residue A to water is 1:1. After the stirring is completed, filter the mud to obtain filtrate B and filter residue B. Filtrate B is mixed with filtrate A to obtain filtrate C.

[0031] Copper recycling.

[0032] Add ammonium sulfide or sodium sulfide in filtrate C until the blue color does not appear in filtrate C, wherein the reference addition amount of ammonium sulfide or sodium sulfide is 1.3 times of the theoretical reaction amount. The reacted mixture is subjected to pressure filtration treatment, and the filter residue after pressure filtration is copper concentrate ri...

Embodiment 3

[0039] The composition of acid mud is: Pb36.1%, Se9.56%, Bi4.68%, Cu8.82%, Au8.6g / t, Ag128.6g / t.

[0040] Acid mud pretreatment.

[0041] Add water to the acid mud for stirring and slurrying. The stirring time is 3 hours. The mass ratio of acid mud and water is 1:3, and the temperature is maintained at 90 degrees Celsius. a. Add water to filter residue A and stir for 3 hours. The mass ratio of filter residue A to water is 1:1. After the stirring is completed, press filter the mud to obtain filtrate B and filter residue B. Filtrate B is mixed with filtrate A to obtain filtrate C.

[0042] Copper recycling.

[0043] Add ammonium sulfide or sodium sulfide in filtrate C until the blue color does not appear in filtrate C, wherein the reference addition amount of ammonium sulfide or sodium sulfide is 1.5 times of the theoretical reaction amount. The reacted mixture is subjected to pressure filtration treatment, and the filter residue after pressure filtration is copper concentra...

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Abstract

The invention provides a method for recycling rare and precious metals from acid mud, and relates to the technical field of recycling and reusing of precious metals from the acid mud. The method comprises the following steps: acid mud pretreatment, copper recycling, lead recycling and selenium recycling. The method is particularly suitable for the acid mud with the following features: Pb 30-50%, Se 2-15%, Bi 1-5%, Cu 2-10%, Au 2-10 g / t and Ag 30-200 g / t. The method has the beneficial effects that by acid mud washing, copper metal in the acid mud is recycled and is leached by mixed acid, by high accumulation ability of lead to gold, silver and bismuth, lead-bismuth alloy is prepared by pyrogenic-process smelting, the rare and precious metals such as the bismuth, the gold and the silver are recycled to a maximum extent, selenium powder is prepared in a reducing manner by sulfur dioxide, and compared with a sodium sulfite technology, the method has the feature that sodium salt wastewater or sodium sulfate crystal cannot be formed. Solid waste generated in the technology is mainly from two-time solid-liquid separation, filter residues of solid-liquid separation are rich in lead element, the lead element is used for pyrogenic-process smelting of lead to form the lead-bismuth alloy, therefore, a closed cycle system is formed in a whole technological process, the environment is not polluted, production costs are reduced, and environmentally friendly and clean production is realized.

Description

technical field [0001] The invention relates to the technical field of recovery and reuse of precious metal acid mud, in particular to a method for recovering rare and precious metals from acid mud. Background technique [0002] In the process of sulfide ore pyrometallurgy and acid production, fine dust particles formed by metals with low melting points often enter the exhaust stack along with the flue gas. Acid mud enriched with rare and precious metals such as selenium, bismuth, gold, and silver, which is dominated by heavy metal lead. Because the main component of this kind of resource is lead, most of the factories and mines are currently sold as lead slag to pyrometallurgy enterprises. During the process of lead smelting enterprises, the lead in it is basically recovered, but most of other rare and precious metals are scattered in smoke and water. In the quenched slag, it cannot be recovered. As the mineral resources available for non-ferrous metals are getting less a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B13/02C01B19/02C22B11/02C22B30/06
CPCC01B19/02C22B7/007C22B11/023C22B13/025C22B15/0089C22B30/06Y02P10/20
Inventor 朱来东鲁兴武李彦龙李俞良陈一博程亮易超马爱军陈文波张恩玉曹桂银
Owner 甘肃高能中色环保科技有限公司
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