Barite powder is white or gray crystalline powder, is an important mineral containing barium, chemically inert, good stability, acid, density, hardness, high specific gravity, high whiteness, can absorb the harmful rays (x-ray and γ-rays), etc., a glass gloss, non-magnetic and non-toxic. Thus, widely used in chemical, paint, rubber, glass, paper, medicine and other fields, according to the latest statistics, the size of the use of more than 2000 items.
China's total supply of barite in 2500 to 3000 tons, all from domestic production for. Domestic consumption of barite in 1300 was about 1,200 tons, of which oil and gas exploration for the 700 to 800 million tons, 60% of total consumption; for barium chemical products 400 to 500 million tons, accounting for about 30%; accounting for about 10%. China is the world's largest exporter of barite. 90's annual export volume of barite and its products is generally 150 to 200 tons. Barite and the barium salt in 1996 2.058 million tons exported, the export amount of 121 million, of which 1.86 million tons barite.
Commercial barite is mined from surface or near-surface deposits by open-pit or underground mining methods. The broken ore is trucked to the processing plant where it may be washed by log washer or trommel screen to remove adhering clay and low-grade fines before reduction by jaw or impact crusher to 25 cm or finer for further processing. The degree of further processing and concentration depends on the grade of ore, identified end use, and liberation size (i.e., the size at which the barite is essentially free of contaminating impurities). If a further size reduction is required, this can be accomplished by jaw crusher, impact crusher, cone crusher, or roll crushers.
The concentrated barite may be ground to final size specifications by roller mill, paddle mill, or other suitable unit. A 45-micrometre (μm) product is normally specified for drillmud barite; however, a much finer product may be required for other applications such as chemical and pharmaceutical preparations. Barite used for drilling petroleum wells must be finely ground so that at least 97% of the material, by weight, can pass through a 200-mesh (75-μm) screen, and no more than 30%, by weight can have an effective diameter of less than 6 μm, which is measured using sedimentation techniques. The ground barite must also be dense enough so that its specific gravity is 4.2 or greater, soft enough to not damage the bearings of a tricone drill bit, chemically inert, and contain no more than 250 mg/kg of soluble alkaline salts. A small percentage of iron oxide is allowable.
Barite beneficiation method:
gravity separation: It is a simple method to separate the concentrate.
The processing flow:
Barite mine raw ores → Crushing → screening → desliming → jigging → concentrate
There are other processing methods: magnetic separation and flotation.
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