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Method for recovering gold from iodine-potassium iodide leachate

A technology of potassium iodide and gold leaching is applied in the field of gold recovery from gold-containing waste, which can solve the problems of complex operation process, difficulty in large-scale production, affecting the purity of extracted gold, etc., and achieve the effect of simple operation process and few experimental devices.

Active Publication Date: 2012-07-18
NO 771 INST OF NO 9 RES INST CHINA AEROSPACE SCI & TECH
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Problems solved by technology

[0005] The above methods for extracting gold can extract gold better, and the recovery rate is high, but due to the addition of more chemical reagents or other raw materials, the purity of the extracted gold is seriously affected, and the operation process is complicated, so it is difficult to carry out large-scale production
[0006] The above methods of recovering gold can extract gold better, and the recovery rate is high, but due to the addition of more chemical reagents or other raw materials, the purity of the extracted gold is seriously affected, and the operation process is complicated, so it is difficult to carry out large-scale production

Method used

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Embodiment Construction

[0013] Take a certain amount of gold leaching solution, put it into an open container, add the same amount of concentrated sulfuric acid (H 2 SO 4 ) reagent and half the amount of hydrogen peroxide reagent, heating, as the temperature of the gold leaching solution increases, the iodide ions are reduced to elemental iodine, and the reduced elemental iodine and the iodine in the liquid volatilize in the form of purple smoke from the container, and the purple smoke disappears , when the liquid is colorless and transparent, it indicates that the process of iodine removal is over; continue heating to 350°C to decompose excess concentrated sulfuric acid (H 2 SO 4 ) and hydrogen peroxide, stop heating when white smoke appears at the mouth of the container, cool the container to room temperature, slowly add a small amount of pure water along the wall of the container to dilute the gold immersion solution, filter with ash-free filter paper, wash the filter residue with hot pure water ...

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Abstract

The invention discloses a method for recovering gold from iodine-potassium iodide leachate. Concentrated sulfuric acid (H2SO4) and hydrogen peroxide are added into the leachate containing iodine, potassium iodide and gold iodide, the two reagents are reacted with iodine ions in the leachate to generate iodine, the iodine is volatilized out of a container at high temperature, and after the iodine is volatilized, the leachate is transparent; and the leachate is continuously heated, the two reagents also can convert gold in an ion state into gold in an atomic state to fulfill the aim of reducing the gold, and excessive reagents are decomposed at high temperature. The invention aims to control the types and weight of the added chemicals, simplify the operating process and improve the purity of the recovered gold; and by the method, the utilization rate of the gold can be greatly improved.

Description

Technical field: [0001] The invention belongs to the field of gold recovery from gold-containing waste materials, and relates to a gold recovery method in an iodine-potassium iodide gold leaching solution. Background technique: [0002] At present, the recovery methods of gold in iodine-potassium iodide leaching solution include zinc powder replacement method, anhydrous sodium sulfite reduction method, activated carbon / foam plastic adsorption method and electrolytic deposition method. Because the immersion solution contains a large amount of iodine (7%) and potassium iodide (15%), the usual treatment method is to add acid (hydrochloric acid, nitric acid, hydrogen peroxide) or stannous chloride to remove the iodine in the immersion solution. Then add reducing agent or use high temperature burning to recover gold. [0003] Li Guichun [1] conducted in-depth and meticulous research on the recovery method of gold in the gold leaching solution, and the research results show that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B7/00
CPCY02P10/20
Inventor 宋小年和德路苏武李武京
Owner NO 771 INST OF NO 9 RES INST CHINA AEROSPACE SCI & TECH
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