Ball mill: Ball mill may be the very important equipment for regrinding after primary crushing. It is actually good choice for dry or wet grinding any kinds of minerals as well as other grindability supplies. It can be extensively applied in cement, silicate solutions, new construction material, refractory material, chemical fertilizer, ferrous and non-ferrous metals beneficiation and glass ceramics industries.
Besides, it can be used in paper making, rubber and plastics, paint, textile and other filling or white paint. Kaolinite is mainly white mud; grain is exquisite, and it looks like flour.Kaolinite is also can be called as kaolin and it is a kind of containing aluminum silicate minerals. Its chemical composition is quite stable. Being the main raw material of manufacturing porcelain and pottery, it is mainly used to make daily ceramics, industrial ceramics, sanitary ceramics and refractory materials.
Tanzania has been the major gold producer in Africa. Diamonds, gold, nickel and gemstones play key roles in Tanzania's growing minerals industry. Up to 15% of Africa's exploration expenditure has been spent in Tanzania, thought to have Africa's largest gold reserves, after South Africa. The mining industry in Tanzania grew largely in modern time, a major increase from the previous years' 17%. Tanzania has vast amounts of other types of minerals including coal, iron, uranium, chrome, tin, platinum, coltan, niobium, and others.
Advantage of the present utility model and good effect are to have reduced the power that drives the jaw crusher required motor significantly, and saves energy reduces cost, economic benefit and obvious social benefit.
The invention relates more particularly to a process of chemical conversion of values consisting of rare-earth lino-carbonates, fluorides, oxy-fluorides, boro-fluorides, or silico-fluorides to rare-earth oxides, concurrent with the chemical conversion of substantially all the fluorine content of said values to water-soluble fluorides which'may thereafter be removed, along with other water-soluble impurities, by leaching with water. Further, the invention relates to a process for recovering rare-earth oxides in a concentration of 60% or more from an ore or ore concentrate in which the gangue consists chiefly of barite, by chemically converting the values to rare-earth oxides, concurrently converting substantially all the fluorine content thereof to water-soluble fluorides, separating the latter and other water-soluble impurities from the former by leaching with water, and thereafter further concentrating the rare-earth oxides by gravity separation of barite therefrom.
Tunnelling and Underground Space Technology, 2013, 35: 37–54.CHO J W, JEON S, JEONG H Y, CHANG S H. Evaluation of cutting efficiency during TBM disc cutter excavation within a Korean granitic rock using linear-cutting-machine testing and photogrammetric measurement [J].
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