Hainan × × fluorite ore is a quartz -fluorite deposit, the ore-forming temperature is low, the fluorite crystallization is incomplete, the size of the inlay is fine, and the quartz inlay is closely related. The fluorite is difficult to dissociate from the monomer, which is a fine-grained intercalation. The refractory fluorite deposit, whose main harmful impurity is SiO2, the other impurities such as S, P, CaCO3 do not pose a hazard to the concentrate product. Rock ore identification shows that most of the fluorite in the ore is easily dissociated. When grinding to -200 mesh 75%, 85% of the monomer has dissociated, but a small part of the fluorite is extremely difficult to dissociate until the fineness When it reaches 95% of -200 mesh, it is possible to obtain the ideal index. If this grinding degree is achieved by a section of grinding, it is obviously uneconomical. The ore dressing test results show that the ore can obtain qualified concentrate under the condition of -200 mesh 75-80% grinding fineness, and the open circuit recovery rate is about 65%. The grinding degree can be improved by a section of grinding, and the product quality can be appropriately improved. However, the recovery rate is reduced; the re-grinding test of coarse concentrate shows that it is difficult to improve the grinding degree and the ore dressing index; under a period of grinding-200 mesh 80% fineness, the closed-circuit beneficiation test is carried out, and the following index is obtained: CaF298. 35%, SiO20.94%, CaCO30.35%, recovery rate 74.40%. For the ore, our view is: the design uses two-stage grinding, one section of grinding -200 mesh 75-80%, the coarse concentrate is selected by 5-7 times, fine 1~3 mine and sweeping foam products Feed the second section of grinding, the second section of grinding products return to the flotation process (see process flow chart). The medium-mine regrind scheme is superior to the coarse concentrate re-grinding scheme, because 85% of the fluorite mineral monomer has been dissociated when the mine is milled to -200 mesh 75%, and the coarse concentrate re-grinding will cause the monomer to dissociate. The over-grinding of the mineral is not conducive to the subsequent selection of the operation; if only a few minerals based on the continuous body are re-ground, the over-grinding of the monomer-dissociated minerals can be avoided, which is beneficial to improve the process index and reduce the second stage. Grinding capacity, the advantages are obvious. The disadvantage of using a section of grinding is that the fluorite dissociation degree is difficult to guarantee, which is not conducive to the improvement of product quality and beneficiation recovery rate. If the grinding degree is increased to -200 mesh 80% or more at one time, the grinding cost will be doubled. . If the investor insists on adopting a grinding process, part of the ore in the flotation process should be concentrated and returned to re-grind, but in this part of the regrind, whether the fineness of the mill reaches the monomer dissociation, it is impossible to grasp in the production process. The additional ore dressing consumption will be much larger than the second-stage grinding (mainly in the treatment of low ore). Therefore, we still advocate the use of the second-stage grinding-mineral regrind process. High Precision Sk Collet,High precision collet chuck combines advantages of DIN6499/ISO15488A standard and B standard. High speed cutting such spring collet is mainly applied to the need for good in the radial runout error. Sk Collet,Sk Machine Collet,High Precision Sk Collet,Csk13 Spring Collet Shandong Chongde Precision Machinery Co.,LTD , https://www.springcollet.com
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