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应用两段细粒反浮选法处理美国佛罗里达高白云石含量的磷酸盐砾石。在本研究中,将含白云石的磷酸盐砾石样品磨至-150μm,以使磷酸盐矿物单体解离,保证获得最高P2O5品位和回收率的磷精矿。在白云石优先浮选中,用选择性的脂肪酸作白云石的捕收剂,用H3PO4/H2SO4混合物(2∶1)作为磷酸盐矿物的抑制剂和pH调整剂,浮选pH为5~5.5。对富含磷酸盐的白云石浮选槽内产品进行分级。再用脂肪胺从+37μm粗粒级中反浮选二氧化硅,得到的泡沫产品为抛弃的硅石尾矿。胺浮选的槽内产品与白云石浮选槽内产品的-37μm细粒级合并为磷精矿。当给矿含26%P2O5和2.2%MgO时,获得的最终磷精矿含31.6%P2O5和0.8%MgO,P2O5总回收率为92%。研究了pH和捕收剂用量对白云石浮选效率的影响。用浮选速率模型评价了两种脂肪酸捕收剂的效果。这个两段细粒反浮选法也可有效地用于加工来自美国中佛罗里达不同产地的高含量白云石的磷酸盐砾石。
Application of two-stage fine-grained reverse flotation method to treat high-dolomite phosphate gravels in Florida, USA. In this study, dolomite-bearing phosphate gravel samples were ground to -150 μm to dissociate the phosphate mineral monomer to ensure that the phosphate concentrate with the highest P2O5 grade and recovery was obtained. Preferential flotation in dolomite, with a selective fatty acid as a collector of dolomite, H3PO4 / H2SO4 mixture (2: 1) as a phosphate mineral inhibitor and pH regulator, the flotation pH of 5 to 5.5 . Phosphate-rich dolomite flotation tank products were graded. The flotation of silica from the +37 μm coarse fraction with fatty amines gave a foamed product of discarded silica tailings. Amine flotation tank products and dolomite flotation tank products -37μm fine grade merged into phosphate concentrate. When the ore contains 26% P2O5 and 2.2% MgO, the final phosphate concentrate obtained contains 31.6% P2O5 and 0.8% MgO, with a total P2O5 recovery of 92%. The effect of pH and collector dosage on dolomite flotation efficiency was studied. The flotation rate model was used to evaluate the effect of two fatty acid collectors. The two-stage fine-grained reverse flotation process can also be effectively used to process high-dolomite phosphate gravels from different areas in Central Florida, USA.