1. Jingui Banking
Judging from the ROE in recent five years, the average ROE in recent five years is -66.38%, the lowest ROE in recent five years is -284.25% 20 19, and the highest roe is 8.4 1% 20 17. The company is a high-tech enterprise that comprehensively recovers silver, lead, gold, bismuth, antimony, zinc, copper, indium and other non-ferrous metals from silver-rich lead concentrate and lead smelting waste liquid. The main business is mainly silver smelting and deep processing, supporting lead smelting and comprehensively recovering valuable metals such as gold, bismuth, antimony, zinc, copper and indium.
2. Zhu Ye Group
According to the ROE in recent five years, the average ROE in recent five years is11.1%,and the lowest ROE in recent five years is-11.58% 2017. The company comprehensively recovers rare precious metals such as copper, gold, silver, bismuth, cadmium, indium and germanium and sulfuric acid products.
3. Xingye Mining
According to the ROE in recent five years, the average ROE in recent five years is 1.87%, and the highest roe is11.03% 2017. The company's main products are lead, zinc, copper, iron, bismuth, tungsten and other non-ferrous metals and ferrous metals.
4. Jiangxi Copper
Judging from the ROE in recent five years, the average ROE in recent five years is 3.8 1%, and the highest roe is 5.03% of that in 20 18 years. Products include cathode copper, gold, silver, sulfuric acid, copper rod, copper tube, copper foil, selenium, tellurium, rhenium, bismuth and more than 50 varieties.
5. Chihong Zinc Germanium
According to the ROE in recent five years, the average ROE in recent five years is 1. 14%, the lowest ROE in recent five years is-19. 15%, and the highest roe is 20 17. The company has more than 20 enterprises in Yunnan, Sichuan, Inner Mongolia, Heilongjiang, * * and foreign countries such as Canada and Australia, with a mineral processing capacity of 2 million tons/year and lead and zinc metal of 300,000 tons/year. The self-sufficiency rate of raw materials is above 50%, and more than 10 metal varieties such as germanium, gold, silver, cadmium, bismuth, tellurium and indium are comprehensively recovered, ranking first in the industry in comprehensive competitiveness.
6. Yunnan copper industry
Judging from the ROE in recent five years, the average ROE in recent five years is 4.52%, the lowest ROE in recent five years is 20 18 1.87%, and the highest roe is 8.34% of 20 19. The company's main products are electrolytic copper, copper rod, sulfuric acid, iron concentrate, precious metals and so on. The company also recycles lead, zinc, bismuth, selenium, platinum, palladium and other non-ferrous metals and rare precious metals.
Brief introduction of metallic bismuth
Bismuth exists in the form of free metals and minerals in nature. Minerals include bismuthite and bismuthite. Metal bismuth is obtained by calcining minerals into bismuth trioxide, and then co-thermal reduction with carbon. High purity bismuth can be obtained by pyrometallurgical refining and electrolytic refining. Silvery white or reddish with metallic luster. Brittle and hard, lack of ductility, poor electrical and thermal conductivity. Tellurides of selenium and bismuth have semiconductor properties. Bismuth is insoluble in water and non-oxidizing acids.
Main products of bismuth: There are about 100 kinds of bismuth products abroad, but only about 50 kinds in China. At present, the main bismuth products are refined bismuth, high-purity bismuth, bismuth alloy, bismuth oxide, bismuth oxychloride, bismuth subnitrate, bismuth potassium citrate, bismuth gallate and bismuth composite aluminate. In addition, there are some varieties that are often used but seldom used, such as basic bismuth carbonate, bismuth sulfide, bismuth sodium, bismuth sulfate, bismuth nitrate, bismuth potassium iodide, bismuth oxynitrate, bismuth aluminate, bismuth potassium tartrate, bismuth ethyl camphor, bismuth basic salicylate, bismuth basic citrate, bismuth potassium citrate, bismuth vanadate, bismuth germanate, bismuth silicate, bismuth trichloride and bismuth tripotassium citrate.