Environment-friendly sulfur-containing gold leaching reagent and preparation method thereof

A gold leaching agent and environmental protection technology, which is applied in the field of sulfur-containing environmental protection gold leaching agent and its preparation, can solve the problems of thiourea oxidative decomposition, thiourea dosage and high cost, and achieve the effect of operating environment friendly

Active Publication Date: 2017-06-27
CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thiourea gold leaching process still needs to be further improved. One of the most important points is that the dosage and cost of thiourea are much higher than that of the cyanide method.
In addition, there are some technical obstacles in promoting the use of thiourea, especially under oxidative conditions, thiourea will be oxidized and decomposed into dithioformamidine

Method used

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  • Environment-friendly sulfur-containing gold leaching reagent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: Get 8g of sodium thiosulfate pentahydrate and 4g of sodium tetrasulfide, dissolve them in 100mL of water, put them in a reaction kettle, add 10mL of ammonia water, slowly add 20mL of 1wt% bromine water, the reaction temperature is 55°C, and the reaction process is sampled. Observe that the absorption peak of sodium thiosulfate at wavelength 217nm weakens at the UV spectrophotometer, and the product absorbs at 288nm, and the absorption peak at 217nm disappears substantially (at this time, the solution turns pale yellow), and the absorption spectrum is as follows: figure 1 Shown in a, stop reacting at this moment. Then add 2 mL of saturated zinc sulfate solution to precipitate excess sulfur and polysulfide; filter and collect the filtrate to obtain 110 mL of liquid gold leaching agent.

[0022] Get 10mL of liquid gold leaching agent, 0.12g of copper sulfate pentahydrate, 6mL of ammonia water containing 28% ammonia, add tap water to form a 300mL solution; get...

Embodiment 2

[0023] Embodiment 2: Sodium tetrasulfide crystal 10g, be dissolved in 100mL water, be placed in reaction kettle, add the ammoniacal liquor 20mL of content 28%, this moment solution pH value is 11, then slowly add the bleaching powder emulsion of 15wt%, at normal temperature After the reaction, when the solution turns light yellow, stop adding the oxidant, take a sample and observe it with a UV spectrophotometer and find that there is a maximum absorption peak at 288nm, and the absorption spectrum is as follows: figure 1 Shown in b. Then add 5 mL of saturated zinc sulfate ammonia complex solution to precipitate excess sulfur radicals and polysulfide radicals; filter, wash the filter residue, collect the filtrate, and obtain 160 mL of liquid gold leaching agent.

[0024] Take 50mL of liquid gold leaching agent, 0.4g of copper sulfate, 10mL of ammonia water with an ammonia content of 28%, and add tap water to form a 300mL solution; take 100g of fine-grained fine gold ore with a g...

Embodiment 3

[0025] Embodiment 3: Get sublimated sulfur 30g, calcium hydroxide 15g, be dissolved in 100mL water, be placed in reactor, reaction temperature 95 ℃, this moment solution pH value is 11, then slowly add the bleaching powder emulsion of 15wt% until The average chemical valence of sulfur in the feed liquid is 2~3 (solution becomes light yellow at this moment), stop adding oxidizing agent, sampling has maximum absorption peak at 288nm place of ultraviolet spectrophotometer observation, and absorption spectrum is as follows figure 1 Shown in c. Then add 5 mL of zinc sulfate ammonia complex solution to precipitate excess sulfur and polysulfide; filter, wash the filter residue, collect the filtrate, and obtain 200 mL of liquid gold leaching agent. The liquid gold leaching agent was evaporated and crystallized to obtain 17.8 g of solid gold leaching agent.

[0026] Take 0.3g of solid gold leaching agent, 0.24g of copper sulfate pentahydrate, 6mL of ammonia water containing 28% ammoni...

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Abstract

The invention discloses an environment-friendly sulfur-containing gold leaching reagent and a preparation method thereof. The preparation method of the gold leaching reagent comprises steps as follows: a sulfur-containing substance is taken as a raw material and dissolved in water, an oxidizing agent is added for oxidation, average chemical valence of sulfur in an obtained solution is controlled to be 2-3, then sulfide and/or polysulfide is removed, filtering is performed, a filtrate is collected, and a liquid gold leaching reagent is obtained. The sulfur-containing substance is subjected to oxidation operation, the degree of oxidation of the sulfur-containing substance is controlled, then sulfide and/or polysulfide is removed, so that the use quantity of the obtained gold leaching reagent during gold leaching is substantially reduced, and concentration of the gold leaching reagent during gold leaching at the normal temperature and under the normal pressure is 0.2-20 g/L in terms of a solid gold leaching reagent; the obtained gold leaching reagent is free of cyanide, and the operation is environment-friendly.

Description

technical field [0001] The invention relates to a gold leaching reagent for extracting gold from gold mines, in particular to a sulfur-containing environment-friendly gold leaching agent and a preparation method thereof. Background technique [0002] Gold is the first metal discovered and utilized by humans, and the gold extraction process has a long history. For more than 100 years since the appearance of cyanidation, it has been greatly developed and occupies a dominant position in the gold industry. The cyanidation gold leaching process is simple, with good adaptability and high gold recovery rate. Nowadays, there are many gold leaching techniques, and the cyanidation method is still dominant, but the severe toxicity of the cyanidation method seriously endangers the environment and human health, especially the policy factors in our country, resulting in high management costs for cyanidation gold leaching. Therefore, low-toxicity or cyanide-free gold leaching is an impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/14C22B11/00
CPCC22B3/14C22B11/04
Inventor 冯吉福马荣锴周卫宁袁江涛李尽善罗星夏瑜丁冲
Owner CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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