某白钨加温精选尾矿中萤石回收试验

Recovery Experiment of Fluorite from Scheelite's Heated Processing Tailings

河南某白钨尾矿中萤石含量占25%左右,是亟待回收的矿产资源。尾矿中碳酸钙含量在45%以上,属典型的高钙型萤石。尾矿中萤石在白钨加温精选过程的高温条件下受到大量水玻璃的强烈作用,可浮性变差。试验表明,碳酸钙的可浮性明显好于萤石。本研究采用碳酸钙优先浮选—再萤石浮选试验流程,以降低浮选流程中碳酸钙含量和提高萤石浮选粗精矿品位,为萤石精选提供有利条件。闭路流程试验结果表明:碳酸钙优先浮选,可以预先脱除72.44%的碳酸钙,萤石损失率仅为12.98%;最终得到含萤石91.88%,含碳酸钙4.32%,回收率为46.07%的萤石精矿。实现了该钨矿山企业的矿产资源的综合回收目标。

The fluorite content in a scheelite tailings in Henan accounts for about 25 %. The content of calcium carbonate in the tailings is more than 45 %, which is a typical high calcium fluorite. The scheelite floatability became lower after the fluorite was strongly affected by a large amount of water glass under the heated conditions. The test shows that the floatability of calcium carbonate was better than that of fluorite. The flowsheet of Calcium carbonate preferred flotation - fluorite flotation was applied to reduce the content of calcium carbonate and improve the grade of fluorite flotation coarse concentrate. The closed circuit test results show that calcium carbonate can be pre- remove by 72.44 % with fluorite loss rate reaching only 12.98 %. Fluorite concentrate containing 91.88 % fluorite, 4.32 % calcium carbonate was obtained, with recovery attaining up to 46.07 %. The goal of comprehensive recovery of mineral resources in the tungsten mine is realized.