Separation mechanism and effect of fluorite and calcite

Since both the fluorite and calcite minerals contain Ca 2+ cations, they can be floated with fatty acid anion collectors , and calcite inhibitors also inhibit fluorite. For clearly defined standards of content of fluorspar concentrate CaC0 3, the premium, one, two, three fluorite concentrate CaC0 3 content was 0.07%, respectively, 1.0%, 1.2%, 1.5%. Therefore, the separation of fluorite and calcite flotation is a difficult task, and it is necessary to use a suitable adjusting agent in combination with the collector to achieve better results. Typically sodium silicate, sodium silicate and metal salt mixture, phosphates, tannins and lignin sulfonate as an inhibitor of the calcite and the modified compound or in combination to improve the selectivity of the sorting .

Anzifelova studied the mechanism of action of humic acid regulators on carbonate-containing fluorite minerals, indicating that calcite suspensions have stronger adsorption capacity for humic acid agents than fluorite suspensions due to differences in mineral solubility. That is, the humic acid agent has a strong effect on the surface of fluorite and calcite, which reduces the solubility of the mineral and reduces the number of active centers available for the attachment of the collector. The humic acid agent is adsorbed on the surface of the fluorite in an ionic form and a molecular form, and the fluorite and calcite can be effectively sorted at a dosage of 0.05 to 0.1 mg/mol.

Yin Wanzhong et al studied the adsorption mechanism of modified water glass (NSOH) on fluorite/calcite system. It is believed that the hydrolyzed product of modified water glass is mainly silica gel [nSiO 2 ] in dispersed state, and the main stone is mainly inhibited. The colloidal silicic acid and SiO 2 (OH) 2 2- ions, and the order of the mineral inhibiting ability of each component is obtained: SiO 2 (OH) 2 2- >Si(OH) 4 > HSi0 3- . The inhibition is mainly due to the different adsorption capacities of different minerals to colloidal silicic acid and SiO2(OH) ions. The adsorption strength of silicic acid colloidal particles and SiO 2 (OH) ions on the surface of calcite is larger, and the amount of adsorption is larger. Calcite The oleic acid adsorbed on the surface is desorbed (desorbed) due to the competitive adsorption of water glass; while the amount of adsorption on the fluorite surface is small and easy to fall off. Minerals with strong adsorption capacity are easily inhibited by water glass, and those minerals that are not strongly adsorbed or do not substantially adsorb silicic acid and SiO2 (OH) ions are not easily inhibited or substantially inhibited.

S Song et al. studied the heterogeneous condensation of fluorite slurry in Mexican mines. The results show that the fluorite slurry has strong multiphase coacervation in the form of slime coating at pH 9.0, mainly between fluorite and quartz , calcite and quartz in aqueous solution. Stronger electric double layer attraction, weaker repulsion between the fluorite and calcite particles. In the fluorite system containing calcite and quartz, the isoelectric point of fluorite is pH=9.0 to 10.0, calcite is 9.5, and quartz is 1.8. The coarse fluorite particles are coated with a large amount of calcite fine particles of -5 μm size, and the coarse calcite particles are coated with a large amount of fine particles of fluorite to form a strong mineral mud coating. In order to eliminate multiphase cohesion and improve the flotation index of fluorite, the test uses CMC (carboxymethyl cellulose) or water glass as a dispersing agent to improve the froth flotation of fluorite ore. The test results show that oleic acid is used as a collector. When the fluorite concentrate grade is 98%, the fluorite recovery rate is increased from 72% to 78.5%.

Zhouxiao Tong et Hunan occurrence of a mineral-containing carbonaceous calcite - sericite flakes - fluorite ore, using a selection of rougher flotation 9, when a fineness of 97.48% as -O.074mm, When the ore is containing 43.95% of CaF2, 14.57% of calcite, 35.61% of mica and part of muscovite and chalcedony, a fluorite concentrate with a grade of 97.50% and a recovery rate of 80.97% can be obtained. The crude oleic acid T is used as the collector, and the NC and TT are the adjusting agents. When the dosage is 400g/t, 4000g/t and 1000g/t, the fluorite coarse concentrate with a recovery rate of about 97% can be obtained. Select 1~4 segments, when the dosage of NA and TH of the adjusting agent is 600g/t and 1800g/t, respectively, about 50% of calcite is inhibited; in the selected 5-9 segment, when the amount of adjusting agent TD is 1800g/t While suppressing sericite, the residual calcite and its connates are further removed. This study provides a new example of flotation agent combinations for the selection of complex fluorite ore.

Johnson Screen Sieve Plate is a stainless steel Filter Element and is used for screening and filtering. Johnson screen sieve plate is made of v-type wire and support rods rolling welded on the special welding machine. The filtration mode can be divided into two types: from the outside to the inside or from the inside to the outside.

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