Lead physical properties
Lead is a blue-gray metal and the new fracture has a brilliant metallic luster. The solid density was 11.35 g/cm3, the melting point was 327.4°C, the boiling point was 1525°C, pure lead was the softest in the metal, and the Mohs hardness was 1.5. Lead is very malleable, but its ductility is very small and it is not resistant to pull. The thermal conductivity of lead is very low, equivalent to 7.5% of silver, and the electrical conductivity is also very poor, only 7.77% of that of silver.
Lead is highly chemically stable and does not undergo chemical changes in dry air at room temperature. Lead is readily soluble in dilute nitric acid and lead is insoluble in sulfuric acid and hydrochloric acid at room temperature. At room temperature, hydrochloric acid and sulfuric acid act only on the surface of lead. Because the generated PbCl2 and PbS04 are almost insoluble, they adhere to the surface of lead and prevent internal corrosion of the metal. Lead does not react with alkalis, ammonia, chlorine solutions and organic acids and esters.
Application of lead
As lead has the properties of resistance to acids and alkalis, it has a wide range of applications. For example, it can be used to manufacture various components of chemical equipment, electrolyzers in metallurgical plants, communication cable skid, and storage batteries; Babitium alloy lead-base alloy bearing I can be used in solder, ceramics, glass, rubber, petroleum refining and other industrial sectors for lead, since lead can absorb radioactive rays, and it is used in X-ray industry and atomic energy industry. Printing alloys and so on.
The main distribution of lead
There are more than 700 origins, mainly: Xilin in Heilongjiang Province; Hongtunshan and Qingchengzi in Liaoning Province; Caijiayingzi in Hebei Province; Baiyinuo, Dongshengmiao, Jiashengpan and Jiaokou in Inner Mongolia Autonomous Region; Gansu Province Xicheng (Changba); Leadium Mountain in Shaanxi Province; Xitieshan Mountain in Qinghai Province; Shuikoushan and Huangshaping in Hunan Province; Fankou in Guangdong Province; five parts in Zhejiang Province; Cold Water Pit in Jiangxi Province; Jiangsu Province Qixiashan; Dachang of Guangxi Zhuang Autonomous Region; Lanping, Huize, Dulong in Yunnan Province; Lead-zinc mines in Daliangzi and Yucun in Sichuan Province.
Mineral Industry General Requirements
There are 42 lead minerals and lead minerals in China, 11 of which have industrial significance. mine.
General industrial requirements are listed in Table 2.4.17. In lead-zinc deposits, copper, tungsten, tin, molybdenum, tantalum, arsenic, mercury, cobalt, nickel, gold, silver, platinum, rare, scattered, uranium, and pyrite, fluorite, celestite, and barite are often associated. Should pay attention to recycling. U.S. oilfield water containing lead and zinc
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