1. Jiangxi copper industry: the operating income in 2020 will be 318.6 billion, with a year-on-year increase of 32.54%. Products include cathode copper, gold, silver, sulfuric acid, copper rod, copper tube, copper foil, selenium, tellurium, rhenium, bismuth and more than 50 varieties.
2. Chifeng Gold: In 2020, it will realize an operating income of 4.558 billion, a year-on-year increase of -24.89%. Mainly engaged in gold mining and comprehensive recovery of resources, the main products are rare and precious metals such as gold, silver, bismuth, palladium and rhodium.
3. Xingye Mining: In 2020, the operating income was 940 million, up 7.62% year-on-year. The main products of the company are refined silver powder, refined copper powder, refined tin powder, refined zinc powder, refined iron powder and refined lead powder. At the same time, refined bismuth powder, refined tungsten powder and other products are raw materials for smelting metals in non-ferrous metal smelting enterprises.
4. Jingui: In 2020, the operating income was 654.38+205 million, up by -80.56% year-on-year. Jingui Silver Industry is a high-tech enterprise engaged in the comprehensive recovery of silver, lead, gold, bismuth, antimony, zinc, copper, indium and other non-ferrous metals from silver-rich lead concentrate and lead smelting waste liquid. Located in Chenzhou, the silver capital of China, it is one of the important bases for silver production and export in China. With the leading domestic silver smelting and deep processing technology, the annual output of silver ranks in the forefront of similar enterprises in China.
5. Chihong Zinc Germanium: The operating income in 2020 was 65,438+0,965,438+0.6 billion, up 65,438+06.83% year-on-year. The company has been focusing on the lead and zinc industry for more than 60 years. The mine has realized digital mining and dressing, built the "six systems" for underground emergency avoidance, and built the deepest 1.526 m shaft in Asia in Huize. The three major non-ferrous smelting bases are newly built in recent ten years, with large-scale equipment and high degree of automation. They actively introduce and digest advanced smelting technologies at home and abroad, which can handle all kinds of complex raw materials and comprehensively recover valuable metals such as germanium, silver, gold, copper, antimony and bismuth.
1, bismuth, a metallic element, element symbol Bi, atomic number 83, is located in the VI group of the periodic table. Simple substance is silvery white to pink metal, which is fragile, and the chemical properties of bismuth are relatively stable. Bismuth exists in the form of free metals and minerals in nature. In the past, bismuth was considered as a stable element with the largest relative atomic weight. However, in 2003, bismuth was found to have extremely weak radioactivity, and its half-life was determined to be as long as 1.9× 10 19 years. This means that bismuth may not undergo visible decay before human extinction.
2. Bismuth exists in the form of free metal and mineral in nature. Minerals include bismuthite and bismuthite. Metal bismuth is obtained by calcining minerals into bismuth trioxide and then reducing it by carbothermic method. High purity bismuth can be obtained by pyrometallurgical refining and electrolytic refining. The content of bismuth in the crust is very small, which is 2× 10-5%. In nature, bismuth exists in two States: simple substance and compound. The main minerals are bismuthate (Bi2S3), bismuthate (Bi2O3), bismuthate (nbi2o 3·mco 2·H2O), bismuthate (3cu2S4bi2S3) and galena.
3. Bismuth and sulfide (Bi2S3) and bismuth oxide (Bi2O3) in nature, or bismuth loess, are formed by oxidation of bismuth and other sulfide containing bismuth. Because of its low melting point, bismuth can be reduced from its natural ore with carbon. So the ancients got bismuth, but because bismuth is brittle and hard and lacks ductility, the ancients did not find its application after getting it, but left it in the alloy.