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Gold and silver leaching agent prepared from cyanate and method for recovering gold and silver by using leaching agent

A cyanate and leaching agent technology, applied in the leaching agent for gold and silver extraction and recovery, and the field of gold and silver leaching agent recovery of gold and silver, can solve the problems of cyanide highly toxic pollution and other problems, achieve good effect, stable medicinal properties, and production method simple effect

Inactive Publication Date: 2014-04-02
李敬坤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the highly toxic pollution problem of cyanide, to provide a low-cost, effective, cyanide-free, non-toxic or low-toxic gold and silver leaching agent and a method for recovering gold and silver using the leaching agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The metal iron powder and ammonium cyanate are stirred and mixed according to the ratio of 1:50 through the powder to prepare the gold and silver leaching agent, and then added in an amount of about 100 grams per ton of ore. Use lime to adjust the pH value of the pulp to above 9.5, add water to adjust the pulp concentration to about 15%, and then stir and leach for about 10 hours. Finally, precious gold and silver are recovered. This embodiment adopts the least material and the fastest time, and can recover precious gold and silver conveniently, quickly and effectively.

Embodiment 2

[0034] The mixture of metal iron powder and ferrous oxide and the mixture of potassium cyanate and ammonium cyanate are ground and mixed according to the ratio of 1:25 to prepare gold and silver leaching agent, and then use 2000 grams per ton of ore Add about the amount. Use caustic soda to adjust the pH value to above 9.7, add water to adjust the pulp concentration to about 40%, and then stir and leach for 20 hours. Finally, precious gold and silver are recovered. This embodiment uses relatively few materials and takes less time to recover gold and silver in the ore conveniently, quickly and efficiently.

Embodiment 3

[0036] The mixture of ferrous oxide, ferrous chloride and ferrous salt and the mixture of sodium cyanate, calcium cyanate and ammonium cyanate are mixed and crystallized through the solution according to the ratio of 1:2 to prepare the gold and silver leaching agent, and then according to Add about 5000 grams per ton of ore. Use caustic soda to adjust the pH value to about 10, add water to adjust the slurry concentration to about 70%, and then stir and leach for 30 hours. Finally, precious gold and silver are recovered. If the ore is lean ore or multi-element complex ore, after 30 hours of stirring and leaching, or continuous immersion or heap leaching for 45 days. Finally, precious gold and silver are recovered. Although this embodiment takes a long time, it can recover precious gold and silver to the greatest extent, and the requirements for raw materials are not high, and lean ore can be processed as well as multi-element complex ore.

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Abstract

The invention discloses a gold and silver leaching agent prepared from cyanate. The gold and silver leaching agent is characterized in that low-valence iron or low-valence iron salt is mixed with the cyanate at the weight ratio of 1:(2-50) to obtain the leaching agent. The invention also discloses a using method of the leaching agent. The method comprises the following steps of (1) adding the gold and silver leaching agent into ores or fine ores, wherein 100 to 5000 grams of gold and silver leaching agent is added into every ton of ores or fine ores; (2) adjusting the pH value of ore pulp to be more than 9.5; (3) adding a proper amount of water to regulate the concentration of the ore pulp to be 15 to 70 percent; (4) stirring the ore pulp for 10 to 30 hours; (5) recovering gold and silver. The gold and silver leaching agent can be widely applied to the production of a noble metal mine; the leaching agent can dissolve gold and silver, and form a complex with gold and silver ions to facilitate the dissolution of gold and silver; the leaching agent and the method can also be used in the industrial production industries of electroplating and the like to replace chemicals with toxic sodium cyanide; compared with all other nontoxic or low-toxicity beneficiation chemicals, the leaching agent has the characteristics of good effects, stable potency, environmental friendliness, simplicity of a production method, low cost and the like.

Description

technical field [0001] The invention relates to a gold and silver leaching agent and a gold and silver chemical beneficiation method, especially relates to low toxicity and environmental protection, and is aimed at natural gold ore, natural silver ore, oxidized gold ore, oxidized silver ore, iron cap gold ore, quartz vein gold A leaching agent for gold and silver extraction and recovery of silver ore, gold and silver-containing sulfuric acid slag, and gold and silver-containing electronic product waste, and a gold and silver recovery method using the gold and silver leaching agent. Background technique [0002] At present, the chemical beneficiation of precious metals, especially the beneficiation of gold and silver ores, mainly adopts the cyanide method. At present, more than 85% of the gold in the world is extracted by the cyanide method. The production of gold by cyanidation is a relatively mature process. Its advantages are simple process, low production cost, strong ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B11/00
CPCY02P10/20
Inventor 李敬坤
Owner 李敬坤
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