Non-toxic gold leaching agent and preparation method thereof

A gold leaching agent and transition metal technology, which is applied in the field of non-toxic gold leaching agent and its preparation in the gold dressing and smelting process, can solve the problems of corrosive agent dosage, high agent cost, and low gold leaching rate, and achieve agent consumption Small size, high air oxygen potential, and low cost

Active Publication Date: 2019-07-05
ZIJIN MINING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Studies have shown that non-cyanide gold leaching methods mainly include thiocyanate method, halide method, thiosulfate method, polysulfide method, lime sulfur mixture method and thiourea method, and the most representative one is Barrick gold leaching method. Using thiosulfate to leach a carbon-containing refractory gold mine in Nevada, but the gold leaching rate is low and the chemical cost is high
However, the thiourea method and the halogenation method have not yet achieved industrial application due to the problems of carcinogenicity, corrosiveness and excessive dosage of medicaments.

Method used

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  • Non-toxic gold leaching agent and preparation method thereof

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Effect test

Embodiment 1

[0023] According to the mass ratio, 5 parts of iron sulfate, 1 part of triethylamine, 45 parts of calcium carbonate, and 75 parts of sulfonamide were uniformly mixed and finely ground to obtain a precursor. Place the precursor in an atmosphere muffle furnace, pass through oxygen-enriched air with an oxygen concentration of 60%, and raise the temperature to 600°C. After holding for 0.2h, the melt is taken out and air-cooled to solidify. After cooling to room temperature, finely grind to obtain a non-toxic gold leaching agent. The non-toxic gold leaching agent can directly replace sodium cyanide for use without changing the gold leaching process, and the gold leaching rate can reach more than 90%.

Embodiment 2

[0025] According to the mass ratio, 50 parts of iron sulfate, 5 parts of triethylamine, 80 parts of calcium carbonate, and 100 parts of sulfonamide were uniformly mixed and finely ground to obtain a precursor. Place the precursor in an atmosphere muffle furnace, pass through oxygen-enriched air with an oxygen concentration of 40%, and raise the temperature to 450°C. After holding for 0.1h, the melt is taken out and air-cooled to solidify. After cooling to room temperature, finely grind to obtain a non-toxic gold leaching agent. The non-toxic gold leaching agent can directly replace sodium cyanide for use without changing the gold leaching process, and the gold leaching rate can reach more than 85%.

Embodiment 3

[0027] According to the mass ratio, 25 parts of zinc sulfate, 10 parts of triethylamine, 100 parts of sodium carbonate, and 64 parts of sulfonamide were mixed and finely ground to obtain a precursor. Place the precursor in an atmosphere muffle furnace, pass through oxygen-enriched air with an oxygen concentration of 60%, and raise the temperature to 800°C. After holding for 0.2h, the melt is taken out and air-cooled to solidify. After cooling to room temperature, finely grind to obtain a non-toxic gold leaching agent. The nontoxic gold leaching agent can directly replace sodium cyanide for use without changing the gold leaching process, and the gold leaching rate can reach more than 92%.

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Abstract

The invention discloses a non-toxic gold leaching agent and a preparation method thereof. The non-toxic gold leaching agent is primarily prepared from the following components in parts by mass: 5-50 parts of a transitional metal compound, 1-10 parts of organic alkali, 20-100 parts of carbonate and 20-100 parts of an amide compound. The non-toxic gold leaching agent is wide in raw material source,easily available, simple in process and low in cost. By adding organic alkali to promote a positive reaction, the agent generation rate is improved and the agent consumption cost is lowered. In a preparation process, by adopting oxygen-enriching air, the oxygen potential of air in the reaction process can be improved, side reactions are inhibited, the reaction generation rate is improved, and thenon-toxic gold leaching agent is small in consumption of agents and good in gold leaching effect.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a non-toxic gold leaching agent used in a gold beneficiation and smelting process and a preparation method thereof. Background technique [0002] Cyanide gold leaching has been developed for more than 100 years, and has been dominant in the gold industry for a long time. The cyanide gold extraction process is simple, has good adaptability and high gold recovery rate, which is the main reason why this method has been adopted by people for a long time. With the continuous improvement of our country's awareness of environmental protection, more and more attention has been paid to the environmental protection of gold mines. It has become an urgent problem to be solved in the gold industry to develop a non-toxic non-cyanide reagent to replace sodium cyanide. [0003] Research shows that non-cyanide gold leaching methods mainly include thiocyanate method, halide method, thiosulfate method, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B11/00
CPCC22B3/04C22B11/04Y02P10/20
Inventor 陈景河衷水平陈杭苏秀珠李国尧王俊娥吴星琳
Owner ZIJIN MINING GROUP
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