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

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...

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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

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