Copper is a comprehensive recovery of low-grade ore tailings Sichuan refractory apatite, developed a new type of collector ZP-02, was confirmed by a single experiment mineral ZP-02 has more than oleic acid soap and paraffin oxide The ability to capture and better selectivity, and determined that water glass is an effective inhibitor of separation of gangue mineral quartz , the suitable pulp pH is 10. On the basis of the single mineral test, the flotation test was carried out on the actual tailings sample, and the phosphorus concentrate with the P ₂ O ₅ grade of 25.32% and the recovery rate of 69.87% was obtained, which realized the effective of the apatite in the tailings. sorting.

Hu Yuehua et al. studied the interaction between water glass and apatite and calcite by flotation test, Zeta potential and adsorption measurement and solution equilibrium calculation. The solubility of calcite, and calcium was dissolved concentrations greater waterglass hydrolyzing component HSiO ₃ ^- and SiO ₃ ^{2 -} calcite surface chemical reaction with Ca ^{2 +} occurs, precipitated calcium silicate, sodium silicate, calcite surface The adsorption amount is much larger than that on the surface of the apatite, which causes the negative zeta potential of the calcite surface to increase significantly. When there is no pair of water glass, the floatability of apatite and calcite is very good. When the amount of water glass is 80 mg/L and the pH is >9.5, the calcite has a selective inhibition effect, and the recovery rate is reduced from about 90% to about 10%. Water glass also inhibits apatite, but the effect is weak, and the recovery rate is only reduced by about 10%.

The inorganic modifier sodium carbonate, water glass and their interaction have a relatively large influence on the separation characteristics of apatite. The results show that when the amount of sodium carbonate is low, the concentrate grade decreases and the recovery rate increases with the increase of the dosage. Increase; when the dosage exceeds 3kg/t, the concentrate grade increases and the recovery rate decreases. As the amount of water glass increases, the concentrate grade increases and the recovery rate decreases. The interaction between sodium carbonate and water glass has a significant effect on the sorting characteristics of apatite. In a certain range, the amount of sodium carbonate and water glass is increased at the same time, and the concentrate grade and recovery rate are improved.

The flotation test results of silicon calcium ( magnesium ) phosphate rock show that acidified water glass (a certain concentration of ordinary water glass and sulfuric acid aqueous solution mixed in a certain ratio) is used to activate silicon activated by Ca ^{2 +} and Mg ^{2 +} ions. The acid salt mineral has a strong selective inhibition effect, and its selective inhibition effect is more obvious than that of conventional water glass and the like. This is mainly because the hydrolyzate is acidified waterglass silica gel strong inhibitory activity [nSiO _2], while the acidified water glass of water can eliminate common metal metal ion activation quartz, which has a role of acid impurity deactivation. Moreover, the acidified water glass has a strong defoaming effect, can greatly improve the foam characteristics of the fatty acid flotation, and enhance the secondary enrichment of the foam layer, thereby enhancing the effect of removing impurities. Increased the selectivity of flotation.

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