A method for extracting silver from metallurgical waste liquid

A waste liquid and metallurgical technology, which is applied in the field of gold smelting waste liquid treatment, can solve the problems such as silver element is not easy to extract, and achieve the effects of less auxiliary materials, zero discharge cycle and high efficiency

Active Publication Date: 2022-03-01
招金矿业股份有限公司蚕庄金矿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims at the problem that the silver element is not easy to be raised in the process of non-cyanidation gold ore smelting, and provides a method for extracting silver from metallurgical waste liquid

Method used

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  • A method for extracting silver from metallurgical waste liquid

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Embodiment 1

[0015] A method for extracting silver from metallurgical waste liquid, comprising the steps of:

[0016] 1) Leave the acidic waste liquid after metallurgy to stand, take the supernatant, heat and concentrate just after precipitation, and set aside;

[0017] 2) Take 15 denier nylon 6 fiber, cut it to 5mm, put it into a DMSO solution of sodium hydroxide, the mass ratio of sodium hydroxide to DMSO is 1.5:1, and stir at a constant speed at 60°C for 30 minutes;

[0018] 3) drip the solution obtained in step 2) into the concentrated solution obtained in step 1) dropwise, stop the dripping when the pH of the mixed solution is 6, filter after standing for 5 days, and obtain the complexed nylon staple fiber and filtrate, and combine the filtrate with Step 1) The acidic waste liquid after metallurgy used is mixed and recycled;

[0019] 4) Put the complexed nylon staple fiber obtained in step 3) into 10wt% hydrochloric acid, control the mass ratio of the complexed nylon staple fiber to ...

Embodiment 2

[0021] A method for extracting silver from metallurgical waste liquid, comprising the steps of:

[0022] 1) Leave the acidic waste liquid after metallurgy to stand, take the supernatant, heat and concentrate just after precipitation, and set aside;

[0023] 2) Take 20 denier nylon 56 fiber, cut it to 10mm, put it into a DMSO solution of sodium hydroxide, the mass ratio of sodium hydroxide to DMSO is 1:1, and stir at a constant speed at 65°C for 25 minutes;

[0024] 3) drip the solution obtained in step 2) into the concentrated solution obtained in step 1) dropwise, stop the dripping when the pH of the mixed solution is 6, filter after standing for 4 days, and obtain the complexed nylon staple fiber and filtrate, and combine the filtrate with Step 1) The acidic waste liquid after metallurgy used is mixed and recycled;

[0025] 4) Put the complexed nylon staple fiber obtained in step 3) into 7wt% hydrochloric acid, control the mass ratio of the complexed nylon staple fiber to h...

Embodiment 3

[0027] A method for extracting silver from metallurgical waste liquid, comprising the steps of:

[0028] 1) Leave the acidic waste liquid after metallurgy to stand, take the supernatant, heat and concentrate just after precipitation, and set aside;

[0029] 2) Take 5 denier nylon 6 fiber, cut it to 10mm, put it into a DMSO solution of sodium hydroxide, the mass ratio of sodium hydroxide to DMSO is 1.5:1, and stir at a constant speed at 70°C for 20 minutes;

[0030] 3) drip the solution obtained in step 2) into the concentrated solution obtained in step 1) dropwise, stop the dripping when the pH of the mixed solution is 6, filter after standing for 3 days, and obtain the complexed nylon staple fiber and filtrate, and combine the filtrate with Step 1) The acidic waste liquid after metallurgy used is mixed and recycled;

[0031] 4) Put the complexed nylon staple fiber obtained in step 3) into 5wt% hydrochloric acid, control the mass ratio of the complexed nylon staple fiber to h...

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Abstract

The invention discloses a method for extracting silver from metallurgical waste liquid: 1) leave the acidic waste liquid after metallurgy to stand, take the supernatant, heat and concentrate; 2) take nylon fiber, cut it to 5-10mm, place Add the DMSO solution of sodium hydroxide, stir at 60°C-70°C for 20-30 minutes; 3) drop the solution obtained in step 2) into the concentrated solution drop by drop until the pH is 6, stop, leave it for 3-5 days and filter to obtain Complexed nylon staple fiber and filtrate; 4) Put the complexed nylon staple fiber into hydrochloric acid, stir at 1000-1500rpm for 30-60min, filter to separate the fiber from the solution, leave the solution to stand, and the precipitation is silver chloride. In the present invention, the extraction operation for silver element is added in the gold ore smelting process, and the silver ion is separated from the acid waste liquid by complexing the silver ion with the deprotonated nylon short fiber, and then the insoluble property of silver chloride in hydrochloric acid is used High-purity silver chloride powder is obtained, and the invention has high efficiency of extracting silver element from acidic waste liquid, uses less auxiliary materials, and can realize zero discharge cycle.

Description

technical field [0001] The invention relates to the treatment of gold smelting waste liquid, in particular to a method for extracting silver from metallurgical waste liquid. Background technique [0002] The treatment methods of gold concentrate in gold production mainly include cyanidation method, bacterial oxidation method and hot pressing method, among which, besides cyanide method, the gold element and silver element in gold concentrate can be leached successively, and a variety of gold elements can be obtained at the same time. Precious metals, but it is not suitable for the cyanidation method of gold ore with low quality, high cost and low leaching efficiency. For the smelting process of gold mines that cannot be treated by cyanidation, there are still a certain amount of silver and other metal elements with a small amount in the acidic waste liquid after metallurgy. Silver element cannot be extracted but exists in solid waste or solid liquid, resulting in waste and e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B7/00
CPCC22B11/044Y02P10/20
Inventor 姜绍军王东生付佳杰曹喜青王丽杨鑫刘晓春
Owner 招金矿业股份有限公司蚕庄金矿
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