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Composite gold-leaching agent and preparation method thereof

A gold leaching agent and composite technology, applied in the field of composite gold leaching agent and its preparation, can solve the problems of unsuitable gold ore, limited use of gold leaching agent, highly toxic sodium cyanide, etc., and achieve short gold leaching cycle , control passivation, high gold leaching rate

Inactive Publication Date: 2015-02-25
刘书志
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing gold leaching agent is sodium cyanide, which is highly toxic and cannot be applied to all gold mines, which limits the use of gold leaching agents

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0022] The preparation method of composite gold leaching agent of the present invention comprises the steps:

[0023] (1) Use urea as the main raw material to add catalysts, fluxes, oxidants, and stabilizers to heat in a high-temperature-resistant stainless steel industrial electric furnace to perform high-temperature pyrolysis and compounding reactions. The reaction temperature is controlled at about 850 degrees Celsius;

[0024] (2) After the reaction of the reactants is completed, the molten body in the furnace is released, and the temperature is naturally lowered to obtain a composite gold leaching agent.

[0025] The complex formed by urea in the process of pyrolysis, condensation, and compound reaction includes: calcium cyanamide, calcium polysulfide, sodium cyanurate, sodium cyanurate, alkaline thiourea, etc. Among them, cyanurate is an inhibitor that can effectively control the passivation in the gold leaching process; calcium polysulfide has a strong anion in activity...

Embodiment 1

[0027] Selected raw materials: urea 600kg, calcium oxide 100Kg, calcium carbonate 50kg, sodium bicarbonate 50kg, sodium sulfide 50kg, zinc oxide 5kg, sodium pyrophosphate 5kg, sodium silicate 5kg, aluminum oxide 1kg, ammonium sulfate 5kg.

[0028] After the above raw materials are fully stirred and mixed, they are added to a stainless steel high-temperature furnace to heat up for pyrolysis and condensation reaction. When the temperature rises to about 850 degrees Celsius, observe that the raw materials in the furnace are completely melted, and the reaction is completed. Immediately discharge the materials and naturally cool down. After cooling, the composite gold leaching agent product is obtained.

Embodiment 2

[0030] Selected raw materials: urea 680kg, calcium oxide 150kg, sodium bicarbonate 190kg, sodium tripolyphosphate 10kg, alumina 2kg, ammonium chloride 10kg.

[0031] After the above raw materials are fully stirred and mixed, they are added to a stainless steel high-temperature furnace to heat up for pyrolysis and condensation reaction. When the temperature rises to about 850 degrees Celsius, observe that the raw materials in the furnace are completely melted, and the reaction is completed. Immediately discharge the materials and naturally cool down. After cooling, the composite gold leaching agent product is obtained.

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Abstract

The invention provides a composite gold-leaching agent which possesses wide application scope and is safe and realible and a preparation method thereof. The composite gold-leaching agent is prepared by employing 65-70 wt% of urea, 0.5-2 wt% of a catalyst, 0.5-5 wt% of a complexing agent, 5-20 wt% of a stabilizer, and 10-20 wt% of a fluxing agent and performing high-temperature pyrolysis combination reaction. The composite gold-leaching agent is capable of forming complexes with multiple noble metal ions, is capable of rapidly forming ligands with noble metals such as gold, silver and the like for dissolving, is applicable to all gold-containing minerals such as oxidation ore, primary gold ore, gold-sivler ore, limonite, high-sulfur ore, high-arsenic high-iron oxidation ore, cyanidation tailings, gold concentrate and the like, and also is applicable to electronic waste gold-plated materials.

Description

technical field [0001] The invention relates to a gold leaching agent and a preparation method thereof, in particular to a composite gold leaching agent and a preparation method thereof. Background technique [0002] The existing gold leaching agent is sodium cyanide, which is highly toxic and cannot be applied to all gold mines, which limits the use of the gold leaching agent. Contents of the invention [0003] The invention provides a safe and reliable complex gold leaching agent with wide application range and a preparation method thereof. [0004] Realize one of the object of the present invention composite gold leaching agent, adopt urea 65~70wt%, catalyzer 0.5~2wt%, complexing agent 0.5~5wt%, stabilizing agent 5~20wt%, flux 10~20wt% after high-temperature heating Decomposition reaction; [0005] The catalyst is one or more of ammonium sulfate, ammonium chloride, zinc oxide; [0006] The complexing agent is sodium pyrophosphate and / or sodium tripolyphosphate; [0...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B3/04
CPCY02P10/20
Inventor 刘书志
Owner 刘书志