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Method for recovering gold from gold-containing waste liquid

A waste liquid recovery and waste liquid technology, which is applied in the direction of improving process efficiency, can solve the problems of high requirements for recycled containers, harmful gases affecting the environment, and cumbersome gold recovery procedures, achieving high recovery rate, advanced technology, and reduced The effect of residual impurities

Pending Publication Date: 2022-04-05
KUNSHAN HONGFUTAI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method consumes a lot of electricity for heating, not only has high requirements for the recycled container, but also produces a large amount of harmful gas to affect the environment, and the follow-up gold recovery process is cumbersome, the process conditions are high, and the gold recovery rate is not high. There is no process that can effectively recover gold in gold-containing waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for recovering gold from gold-containing waste liquid, comprising the following steps:

[0029] a. Put the gold-containing waste liquid into the reaction kettle, the gold-containing waste liquid is an alkaline solution with a pH value of 11, add iron powder to the gold replacement in the gold-containing waste liquid in the reaction kettle, the addition of the iron powder The amount is 4 times the weight of gold per kilogram, that is, 1kg of gold requires 4kg of iron powder. Heat the gold-containing waste liquid in the reactor to 45°C, add iron powder while stirring, stop heating until the gold replacement is complete, and After replacement, the gold tail solution was allowed to stand for 3 hours to room temperature:

[0030] b. filter the gold tail liquid after replacement, wash out the gold slag, and the pH value of the filtered and washed filtrate is neutral;

[0031] c. Slowly add the filtered gold slag into the hydrochloric acid solution to remove iron fro...

Embodiment 2

[0039] A method for recovering gold from gold-containing waste liquid, comprising the following steps:

[0040] a. Put the gold-containing waste liquid into the reaction kettle, the gold-containing waste liquid is an alkaline solution with a pH value of 12, add iron powder to the gold replacement in the gold-containing waste liquid in the reaction kettle, the addition of iron powder The amount is 4.5 times the weight of gold per kilogram, that is, 1kg of gold requires 4.5kg of iron powder. Heat the gold-containing waste liquid in the reactor to 50°C, add iron powder while stirring, and stop heating until the gold replacement is complete. And let the replaced gold tail solution stand for 4h to room temperature:

[0041] b. filter the gold tail liquid after replacement, wash out the gold slag, and the pH value of the filtered and washed filtrate is neutral;

[0042] c. Slowly add the filtered gold slag into the hydrochloric acid solution to remove iron from the gold slag. After...

Embodiment 3

[0049] A method for recovering gold from gold-containing waste liquid, comprising the following steps:

[0050]a. Put the gold-containing waste liquid into the reactor, the gold-containing waste liquid is an alkaline solution with a pH value of 13, add iron powder to the gold replacement in the gold-containing waste liquid in the reactor, the addition of iron powder The amount is 5 times the weight of gold per kilogram, that is, 1kg of gold requires 5kg of iron powder. Heat the gold-containing waste liquid in the reactor to 40°C, add iron powder while stirring, and stop heating until the gold is completely replaced. After replacement, the gold tail solution was allowed to stand for 2 hours to room temperature:

[0051] b. filter the gold tail liquid after replacement, wash out the gold slag, and the pH value of the filtered and washed filtrate is neutral;

[0052] c. Slowly add the filtered gold slag into the hydrochloric acid solution to remove iron from the gold slag. After...

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PUM

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Abstract

The invention relates to the technical field of precious metal recovery, in particular to a method for recovering gold from gold-containing waste liquid. According to the method, gold in the gold-containing waste liquid is replaced through the iron powder, pretreatment of gold recovery is completed, operation is easy, the gold leaching rate is greatly increased, and further recovery of gold is better facilitated; after the hydrochloric acid solution is added to remove iron from the gold slag, the hydrochloric acid solution is added to ensure complete iron removal, and the purity of the gold slag is improved; after the gold residues are dissolved by aqua regia, hydrochloric acid is added to perform denitration on the dissolved liquid, and the impurity residual rate is reduced; according to the recycling method, gold in the gold-containing waste liquid can be fully recycled, the technology is advanced, the recycling rate is high, operation is convenient, the production cost is effectively reduced, the purity of the recycled finished product gold is high, and the recycling method is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of precious metal recovery, and relates to a method for recovering gold from gold-containing waste liquid. Background technique [0002] Gold is a precious metal element and an international common currency. It is widely used in industrial production departments such as aviation, aerospace and various precision instrument manufacturing. Now with the rapid development of my country's national economy and the continuous improvement of people's living standards, industrial production and processing of jewelry The amount of gold required is increasing year by year, but due to the limited geological reserves of gold, and the production of gold from ores requires many complicated processes, it takes a lot of manpower, material and financial resources to regenerate and recover gold from gold-bearing waste. . [0003] At present, the treatment plants of gold-containing waste liquid generally adopt the method of vacuu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/22C22B3/44C22B3/46C22B7/00
CPCY02P10/20
Inventor 郭振中徐涛
Owner KUNSHAN HONGFUTAI ENVIRONMENTAL PROTECTION TECH