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Fluorite flotation art there is a long three major problems: separating sulfur-containing minerals isolated silicon micro-fine mineral fluorite and quartz or flake mica, barite and fluorite, and the like pyrite, calcite and fluorite Separation of calcium-containing minerals such as scheelite . Due to the successful development of "H series modified water glass composite agent", and reasonable introduction of the "double loop" cycle of the middle mine, the coarse (medium) grain embedded fluorite-quartz ore flotation index was improved.
Acidified water glass has a strong selective inhibition effect on SiO 2 in fluorite-quartz type ore, and its selective inhibition effect is obviously superior to inhibitors such as water glass. Studies indicate that this inhibitor is that the pH of the pulp was acidic to strongly hydrophilic with ionic micelles H 2 SiO 3 as a major component suppression, while also eliminating calcium and other metal ions is inevitable that the quartz activation. In addition, the acidified water glass has a brittle defoaming effect, can effectively improve the characteristics of the flotation foam, and strengthen the secondary enrichment of the foam, thereby enhancing the effect of removing silicon.
The acidic water glass not only makes the silica and the slime are well suppressed under weakly acidic conditions, but also achieves the purpose of reducing the fluorite concentrate, so that the fluorite concentrate can meet the requirements of the first grade, and the fluorite mineral is The increase in floatability reduces the amount of collector and creates favorable conditions for producing high quality fluorite concentrate.
Water glass + pyrogallic acid + ferrous sulfate is a good combination of fluorite-barite ore separation, and their synergistic effect can effectively inhibit barite without inhibiting fluorite. The results show that it can be used to separate fluorite-barite ore to obtain good sorting index: the selected grade of CaF 2 in the four selected concentrates is over 97%, and the recovery rate of rough-selected concentrates (open circuit) is above 82%. .
A fluorite ore contains 65.87% CaF 2 and 11.12% CaO, and the content of calcite and dolomite is 18.09%. Using oleic acid as a collector and flotation with a general inhibitor, a qualified concentrate cannot be obtained. A good effect is obtained by using acidified water glass + Y additive + A additive, that is, M-Y-A mixed inhibitor (M in the mixed inhibitor represents acidified water glass, and Y and A are additives). When the ratio of M:Y:A is 0.5:0.3:0.05, the test effect is the best, and a fluorite concentrate containing CaF 2 >98%, calcite <1.0%, and CaF 2 recovery rate of 84.5% to 85.7% can be obtained.
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