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Technique for recovering gold from gold iodide liquid waste

A technology of gold iodide and waste liquid, which is applied in the field of gold recovery technology in gold iodide waste liquid, and achieves the effects of saving production cost, less environmental hazard, and reducing production cost

Inactive Publication Date: 2016-09-28
KUNSHAN HONGFUTAI ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

[0003] Cyanide is a common method used in modern gold hydrometallurgy, but its high toxicity is a major defect of cyanide solution

Method used

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Examples

Experimental program
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Embodiment 1

[0018] A gold recovery process in gold iodide waste liquid, comprising the following steps:

[0019] Excess iodine is dissolved in sodium hydroxide solution, reacts to form the mixed system of sodium iodate, sodium iodide and water, there is excessive iodine and a large amount of iodide ions in the system, produces stable polyiodide ion, as follows:

[0020] 3I 2 +6Na0H=NaI0 3 +5NaI+3H 2 0;

[0021] I 2 +I － +H 2 0; ←→I 3 -·H 2 0;

[0022] 3I 2 +I － +H20 ←→I 7 － ·H 2 O;

[0023] will step The resulting solution is dripped into the gold-containing waste liquid, and the depth of iodine in the solution is 1%, 1 2 :I － =1:10, the pH value of the solution is adjusted by HI and 1% sodium hydroxide solution, the pH is controlled between 3.5~7, and 2%~3% pro-oxidant is added during the leaching process. － and I 3 － Under the action of reaction for 3~5 hours, Au(I) and Au(I 3 ) of the complex salt, as follows:

[0024] 2Au+I 3 － +I － = 2[AuI 2 ] － ;

[...

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PUM

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Abstract

The present invention provides a technique for recovering gold from a gold iodide liquid waste. The technique comprises a first step of preparation of a mixed system of sodium iodate, sodium iodide and water, a second step of acquisition of a complex salt of Au(I) and Au(I3) under the action of the mixed solution prepared in the first step and a pro-oxidant, a third step of extraction of coarse gold dust, and a fourth step of purification of refined gold dust. In comparison with the prior art, in the above iodide gold-leaching method, a recovery rate of gold and the purity of the recovered gold are greatly raised, meanwhile, the technique is simple in operating process, harms caused by chemical compounds related in the technique to the environment are small, and the cost is low. Therefore, the production cost is reduced and the production efficiency is raised. Moreover, iodine can be recycled and reused, thereby further saving the production cost.

Description

technical field [0001] The invention relates to the technical field of recovery and reuse of gold, in particular to a process for recovering gold from gold iodide waste liquid. Background technique [0002] Gold is a precious metal element and an international common currency. It is widely used in industrial production sectors 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, the amount of gold required for industrial production and processing jewelry is increasing year by year. However, due to the limited geological reserves of gold, and the production of gold from ore requires many processes. Complicated process requires a lot of manpower, material and financial resources to regenerate and recover gold from gold-containing waste. The technological process is simple, and the recovery cost is low. The crude gold obtained from ...

Claims

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Application Information

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IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 徐涛张奎
Owner KUNSHAN HONGFUTAI ENVIRONMENTAL PROTECTION TECH
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