The thiosulfate method has the advantages of fast immersion gold , non-toxicity, insensitivity to impurities, high immersion gold index, low price, and no corrosion to equipment. In the method, the sodium salt and the amine salt are the two most commonly used reagents, and the leaching temperature is generally 50 to 60 ° C. The reaction is carried out under heating conditions, which is sensitive to temperature influence, and the leaching temperature range is narrow, and the process is not easy to control. In order to prevent the decomposition of S 2 O 3 2- , SO 2 or sulfite is often added as a stabilizer. The leaching process maintains its alkaline environment with ammonia water. Cu (NH 3 ) 4 2+ is a common leaching catalyst, thiosulfate The gold extraction method is different from the sulfur vein method. The gold extraction solution medium is an ammonia solution, which is suitable for the treatment of gold minerals with more alkaline components, especially for gold ore or gold concentrate containing copper , manganese and arsenic sensitive to cyanidation. Minerals and copper-bearing gold ores, because such ores produce catalyst Cu(II) compounds themselves during the leaching process. The amount of reagent used in this method is relatively large, and it is necessary to enhance the recycling of the reagent. Therefore, it is important to study the suitable thiosulfate gold extraction process to promote the industrial application of the thiosulfate method.
The United States has studied the technical process of extracting gold and silver from heavy metal ores containing copper, antimony , arsenic, anti-wear, hoof and manganese by thiosulfate method, and built a thiosulfate gold extraction plant in Mexico, but The operation is not normal. China's Shenyang Mining and Metallurgy Institute, Northeast Institute of Technology, Beijing Nonferrous Metals Design and Research Institute and Central South University have successively carried out industrial trials of thiosulfate gold extraction at Rushan Gold Mine.Aluminium Coil
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