Low-toxicity environment-friendly gold mineral separation agent and preparation method thereof

An environment-friendly, beneficiation agent technology, applied in the direction of improving process efficiency, etc., can solve the problems of low leaching rate, high equipment requirements, poor leaching selectivity, etc., and achieve the effect of improving recovery rate, obvious leaching effect, and reducing reaction time

Inactive Publication Date: 2017-02-15
金霖控股(北京)股份有限公司
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  • Abstract
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Problems solved by technology

[0003] At present, 80% of the world's gold is extracted by cyanidation. The main process is: soak the finely ground ore particles in sodium cyanide solution to let the precious metal enter the solution, and then use zinc powder to reduce precipitation, or use other methods Precipitating metals from the solution has been used for a century. It has the advantages of good stability, high leaching rate for easy-to-handle ores, and low cost. However, sodium cyanide is a highly toxic substance, which is harmful during production, transportation and use. There are huge safety hazards, countless accidents caused by the above process, and all the tailings produced by using sodium cyanide contain cyanide and heavy metals, which are hazardous wastes. The stockpiling of tailings takes up a lot of land and is harmful to the environment. At the same time, sodium cyanide has poor leaching effect on refractory ores containing arsenic and carbon, and the recovery rate of gold is only 10-30%.
[0004] In view of the above problems, many manufacturers have developed a variety of environmentally friendly methods after research. At present, the existing environmentally friendly gold extractants or extraction processes mainly include thiourea method, thiosulfate method, halogen method, lime sulfur mixture method, sulfur Cyanate method, etc. Although these processes can effectively leach gold ore under certain specific conditions, these methods have similar disadvantages, such as poor leaching selectivity, low leaching rate, high cost, complex process conditions, and high equipment requirements. Too high, resulting in the above method can not be widely used, is still in the stage of experimental research

Method used

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  • Low-toxicity environment-friendly gold mineral separation agent and preparation method thereof
  • Low-toxicity environment-friendly gold mineral separation agent and preparation method thereof
  • Low-toxicity environment-friendly gold mineral separation agent and preparation method thereof

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preparation example Construction

[0028] The preparation method of the above-mentioned low-toxicity and environment-friendly gold beneficiation agent comprises the following steps:

[0029] ⑴ Weigh each component according to the measurement, mix 30-50 parts of urea, 20-40 parts of sodium carbonate, 5-10 parts of ferrous salt, 1-5 parts of catalyst and 0-30 parts of sodium cyanate and add to high-temperature melting reaction container;

[0030] (2) Raise the temperature to 700-850 degrees Celsius to melt all the materials in the high-temperature melting reaction vessel. After reacting for 3 to 5 hours, add 5 to 10 parts of sodium cyanate, and continue to maintain the temperature of 700-850 degrees Celsius to melt all the materials;

[0031] (3) Filter the product of step (2) to remove impurities. Specifically, the clear magma can be obtained by adopting multiple natural sedimentation methods or filtered by a dense high-temperature-resistant and corrosion-resistant filter screen to obtain clear magma, and then ...

Embodiment 1

[0035] Mix 500Kg of urea, 400Kg of sodium carbonate, 50Kg of sodium ferrocyanide, 10Kg of nickel catalyst, and 200Kg of sodium cyanate evenly, put them into a melting reactor, heat to 800°C, keep them warm for 3 hours after melting, and then add After 80Kg of sodium cyanate is completely melted, pour the molten material liquid into the settling tank for impurity separation. After 10 minutes, the upper layer of clear liquid is diverted to the receiving tray, cooled and crushed, and mixed with 20Kg sodium bicarbonate, 5Kg sodium citrate, 5Kg Sodium thiosulfate is mixed, and the finished product of environment-friendly gold mineral processing agent is obtained after bagging, and the product yield is 87%.

[0036] Full peat slurry process

[0037] Take 1000g of quartz vein-type sulfur-poor gold ore powder provided by Jinbaolun Gold Mine in Hainanshan, the fineness of the ore powder is -200 mesh 78%, put it into a 3L stirring leaching tank, add 1.5L of water, and adjust the pH of t...

Embodiment 2

[0040] Mix 500Kg of urea, 400Kg of sodium carbonate, 30Kg of ferrous ammonium sulfate, 30kg of sodium ferrocyanide, 20Kg of nickel catalyst, and 200Kg of sodium cyanate, put them into a melting reactor, heat to 800°C, and keep warm for 5 hours after melting. Then add 80Kg sodium cyanate in the reactor, after all melting, pour the molten material liquid into the settling tank and carry out impurity separation, after 10min, the clear liquid of the upper floor is divided into the receiving tray, broken after cooling, and 20Kg sodium bicarbonate, 10Kg of thiourea was mixed evenly, and the finished product of the environment-friendly gold mineral processing agent was obtained after bagging, and the product yield was 88%.

[0041] The comparative leaching experiment of the environment-friendly beneficiation agent prepared by this method and sodium cyanide was carried out by the Laizhou refinery of Shandong Gold Group. The gold concentrate grade is 10.18g / t, and the fineness is -200 m...

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Abstract

The invention relates to a low-toxicity environment-friendly gold mineral separation agent. Urea, sodium carbonate, ferrite, catalysts, sodium cyanate and sodium bicarbonate are adopted as main raw materials, and sodium citrate, thiourea and sodium thiosulfate are selectively added. After reactions of certain steps, the finished product is obtained. In the low-toxicity environment-friendly gold mineral separation agent, sodium cyanide with highly toxic hazards is not used, iron, nickel and carbon catalysts are used for catalyst reactions in the technology process, and the reaction time is shortened; by means of filtering measures, produced unmelted impurities are removed, and the effects of the impurities on gold extraction are avoided; in a product formula, multiple mineral separation ingredients and inhibitors, decomposing agents and the like for mineral harmful impurities are matched, and an obvious leaching effect is achieved for ores difficult to treat; and by means of a special two-time charging manner, the recovery rate of the product is increased.

Description

technical field [0001] The invention belongs to the technical field of improving gold refining preparations, in particular to a low-toxic and environment-friendly gold dressing agent and a preparation method thereof. Background technique [0002] Gold is the elemental form of the chemical element gold Au. It is a soft, golden-yellow, corrosion-resistant precious metal. It is one of the rarest, most precious and most valued metals. Gold is chemically stable and has strong Its corrosion resistance can be traded as precious metals, and it can also be used in high-precision equipment and weapon manufacturing. In short, gold is widely used in people's lives. [0003] At present, 80% of the world's gold is extracted by cyanidation. The main process is: soak the finely ground ore particles in sodium cyanide solution to let the precious metal enter the solution, and then use zinc powder to reduce precipitation, or use other methods Precipitating metals from the solution has been us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/04
CPCC22B3/04C22B11/04Y02P10/20
Inventor 南贺
Owner 金霖控股(北京)股份有限公司
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