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Re-election: the original ore is washed and sieved, crushed, graded and de-sludged. After the jigging process, the concentrate with good quality can be obtained, and the product grade can reach over 88%. The concentrate of Hengnan barite mine after gravity dressing can reach 92%. The local people wash the mine with the soil method, and each person can get 100kg of concentrate per day. The crusher is generally a jaw crusher or an impact crusher, and the fine crusher is generally a pair of roller crushers. Select heavy medium drum sorting machine, cone classifier, jig sorter or shaker, screw machine, etc. The barite inlay has a particle size greater than 2 mm, and can usually be sorted by a heavy medium and jigging. The maximum particle size for heavy media sorting is 50mm, and the maximum particle size for wet and dry jigging is about 20mm. The inlay size is less than 2 mm and can be sorted by a shaker or a spiral classifier. Before the selection, a hydrocyclone should be used to remove the mud to improve the sorting effect.
Magnetic: used to select some of the iron-containing minerals such as siderite, barite raw material requirements for low iron barium-based drugs.
Flotation: China's barite ore has more ore and less ore, and more than 80% of the deposits with proven reserves are associated with other minerals. For the sorting of ore and re-selected tailings with very fine grain size, flotation must be used. There are positive flotation flotation and reverse flotation two types of reverse flotation is usually to remove the alkali metal sulfide.
As a common salt mineral, barite is divided into two types according to the adsorption form. One is an anionic collector such as fatty acid alkyl sulfate or alkyl sulfonate, which is chemically adsorbed. Adsorbed on the surface of barite minerals and separated from others; the other is the use of cationic amine collectors to float barite in a physically adsorbed form. Amine collectors are low in efficiency and sensitive to slime, so anionic collectors are preferred. Usually, NaOH is added to the ball mill to adjust the pH value to 8 to 10. The water glass is added to the slurry as a conditioning agent, and the oleic acid collector is used for flotation under the condition of a solid concentration of 40% to 50%.
Hand selection: After the original ore is mined, the simple manual selection is a common dressing method used by many rural miners. Some mines, due to high geological quality and stable quality, can meet the requirements of foreign trade export after hand selection. For example, the Pancun Mine in Xiangzhou, Guangxi, selects the rich ore by hand selection, the particle size requirement is 30-150mm, BaSO 4 >95%, and generally can be greater than 92%. The hand selection method is simple and easy, and does not require any equipment, but the productivity is low and the resources are wasted.