A brief history of cobalt production
As early as 2250 BC, cobalt appeared in the blue glass beads of ancient Persian. China has widely used cobalt compounds as colorants in ceramic production since the Tang Dynasty. In 1735, the Swedish chemist Brandt first isolated cobalt. In 1780 Bergman identified cobalt as an element. Germany and Norway first produced a small amount of cobalt, and in 1874, developed a cobalt oxide mine in New Caledonia. In 1903, the production of silver- cobalt and arsenic- cobalt mines in northern Ontario, Canada, increased the world production of cobalt from 16 tons in 1904 to 1,553 tons in 1909. After the development of the copper- cobalt belt in Zaire Katanga province in 1920, cobalt production has consistently ranked first in the world, and Zambia has often ranked second. After 1933, Morocco produced cobalt from arsenic-cobalt ore, which accounted for the third place in the world at that time. During this period, cobalt was mainly produced by fire. On the eve of World War II, Finland from cobalt-containing pyrite cinder mention cobalt, sent to West Germany after the war chlorination roasting process. In 1968, the Kokkola cobalt plant built in Finland was sulphated and calcined to remove cobalt. Several cobalt mines in the United States were closed between 1959 and 1961 due to environmental protection and the supply and demand of cobalt. By 1972, it was said that cobalt was not produced at all from its own cobalt mine. The nickel port refinery, which was originally planned to deal with nickel-cobalt mixed sulphide produced in the Maawan Bay Nickel Plant in Cuba, was reworked in 1974 and replaced with the cobalt mirror of Botswana. Japan, France, and Belgium also have large-scale cobalt refineries that process cobalt-rich intermediates from the Philippines, Australia, Morocco, and Zambia. This cobalt smelting and mineral resources of the country and cobalt metallurgy pattern of refined cobalt send this industrial countries so far still dominant. In recent years, countries with rich cobalt resources have also established large-scale and complete cobalt metallurgical plants. The development of nickel-cobalt laterite mines in Oceania has increasingly shown its importance. Canada, the Soviet Union, and China recover cobalt from nickel production, which accounts for 25% to 30% of the world's total cobalt production. The extraction of cobalt from various cobalt-containing secondary raw materials has been increasingly noticed. In 1980 alone, 2,500 tons of cobalt was produced from secondary raw materials. Various hydrometallurgical processes have now become the main method of cobalt extraction. After liberation, China established a cobalt refining plant in Jiangxi and Guangdong to extract cobalt oxide from cobalt ore. In 1960, it established a cobalt smelting plant to treat arsenic and cobalt ore. In 1969, there was another smelting plant dealing with cobalt and sulfur concentrate. Put into production. Now, in addition to the processing of individual cobaltite, further slag from the smelting of nickel cobalt, cobalt zinc refining slag, converter slag and copper alloy scrap containing cobalt recovering cobalt. BT SLN Side Lock End Mill Holder 1. High Precision BT SLN Side Lock End Mill Holder, apply to the holder of a DIN1835-B with a solid surface of the cutting tool, high speed and high precision machining . Mechanical spindle and cutting tools and Other Accessories . High Precision BT shank Tool Holder , balanced G6.3 or G2.5 For choose. Side Lock Holder , Side Lock End Mill Chuck , Bt Sln End Mill Holder , Bt Sln End Mill Arbors Shandong Chongde Precision Machinery Co.,LTD , https://www.springcollet.com
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