Late 1970s and early 1980s, thiourea is considered to be the most promising non-toxic method to replace refractory ore cyanidation gold extraction technology to solve problems and environmental issues. However, the process is not yet mature, the reagents are expensive, and the cost is high, forcing the manufacturer to stop production. To solve this problem, the project launched a series of studies infusion to extract gold and silver separation shorten the process, reveal the mechanism of reagent consumption, optimize gold leaching system and process, which made the "process optimization thiourea Law", so that the process begun engineering significance And won the national patent.
According to the stability of precious metal and sulfur-containing test compounds, and the wide range of pH of the copolymer medium , there is coexistence, and the " sulphur faction " theory of polysulfide -based low-molecular coexisting composite immersion gold system is proposed. Established based on this finding thioglycolic acid (and) thiourea combined method of gold, leaching only strengthened, and the new process the gold leaching rate greater than or equal reagent consumption and reduced production cost of the conventional method 1/3 95% - 1 / 5 . Experts believe that “the academic level is at the international leading position, and the two new technologies are the first at home and abroad, and their economic and technical indicators have reached the international advanced level †. American experts commented that " the thiourea method has added new vitality . " At present, the law has been expanded and semi-industrial experimental basis and technical co-microbial treatment will be more meaningful and thus non-toxic cyanide reagent (gold extraction environment materials) and non-polluting mining and smelting, mine rehabilitation and other sustainable development-based " The concept of green metallurgy laid the foundation.
New method invention and system research of stone sulphur mixture ( LSSS )
　　 The LSSS method is based on the strong affinity of precious metals and sulfur. It is prepared by using cheap lime and sulfur as raw materials and containing gold ions such as polysulfide and thiosulfate. The reagent has low cost, high leaching rate ( 2 times - 6 times), high leaching rate for refractory ore, non-toxic and non-polluting, and alkaline medium is advantageous for replacing cyanidation method and utilizing cyanide equipment.
　　 The LSSS method invented two approved patents including " Stone Sulfur Mixture Preparation Method " and " Stone Sulfur Mixture Gold Extraction Method " . The preliminary study solved the related thermodynamic problems of the gold sulphur mixture. After a large number of types of mineral leaching tests in the Northeast, Central Plains and Northwest China, the formed process can make the gold leaching rate more than 95 %, and the cost is equivalent to the cyanidation method, but it is non-toxic.
Hydrometallurgy is the use of chemical methods to separate, purify and enrich ore in water-immersed solutions. It is mainly used in the extraction of rare metals and metals such as gold, silver, copper , zinc , antimony and bismuth . It is gold and colored. One of the main processes of precious metals. Hydrometallurgy includes both pressurized hydrometallurgy and biometallurgy. The early use of hydrometallurgy was in Canada, the United States and other countries. It was initially applied to the beneficiation methods of gold, silver, lead , zinc, copper, aluminum and various precious metals. Later, with the continuous breakthrough of research technology, its application fields Continuous expansion and wider application in the international arena. Â
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