Overview of thiosulfate method

2023-07-18 22:08:48
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.

Steel Casting

In the investment casting industry, steel castings are the most used castings in the manufacturing industry, and are widely used in equipment, agricultural machinery, machining, and automobile industries. Metal castings can produce parts with complex shapes, but there are also requirements for the design of the product structure. In the case of meeting the requirements of use, it should also try to comply with the casting process. For example, in the structural design, care should be taken not to have thin walls, which may easily lead to dissatisfaction with pouring or product deformation; for example, try not to have sharp corners, try to use radian transitions; and try not to appear small and deep blind holes, It will cause great trouble for foundry sand cleaning. Of course, there are many other structural problems. We will improve and optimize the product structure according to the customer's drawings without changing the customer's functional use, so as to maximize the product qualification rate and production efficiency. In some cases where the structure cannot be changed, we will also perform some follow-up processing after casting according to actual problems, so that the expected results can also be achieved.

Steel Casting

Casting Steel,Casting Investments,Castings Services,Wax Casting,Casting Metal,Contact Castings,Sand Casting,Cast Metal,Small Castings

Shenzhen SCZY Technology Co.,Ltd , https://www.szcasting.com