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湖北某高钙云母型含钒石煤中矿物被碳质深度浸染,浮选前需要焙烧脱碳。通过热重-差示扫描量热(TG-DSC)、傅里叶红外光谱(FTIR)、X射线衍射(XRD)等分析测试手段对原矿及不同温度焙烧脱碳样进行了表征分析,探讨了不同温度脱碳对浮选行为的影响。结果表明,该含钒石煤随着焙烧温度的升高,依次发生黄铁矿氧化、碳质的燃烧、方解石的分解等反应。600~700℃,碳质和黄铁矿基本消失,云母八面体结构未被破坏,方解石部分分解,固硫后剩余的CaO使浮选矿浆pH值升高,Ca~(2+)浓度增大。浮选试验结果表明,随焙烧温度的提高,碳质逐渐脱除,矿物表面性质差异扩大,脱碳样的浮选效果比原矿有明显改善。650℃脱碳样浮选,由于Ca~(2+)的活化作用,石英被油酸钠捕收,可得产率为21.10%,V_2O_5品位为0.36%的尾矿产品,钒损失率仅为10.05%,精矿的V_2O_5品位为0.95%。700℃脱碳时,矿浆过高的pH值和Ca~(2+)含量使微细颗粒发生无选择性聚沉,消耗大量的油酸钠,不利于浮选的进行。
Hubei, a high-calcium mica-type vanadium stone coal is deeply contaminated by carbonaceous, flotation needs decarburization before. The decarburization samples of roasted ore and calcined at different temperatures were characterized by TG-DSC, FTIR and XRD, Effect of Different Temperature Decarbonization on Flotation Behavior. The results show that with the increase of calcination temperature, the vanadium-containing stone coal pyrite oxidation, carbonaceous combustion and calcite decomposition occur in turn. At 600-700 ℃, the carbonaceous and pyrite basically disappeared, the mica octahedron structure was not destroyed, calcite partially decomposed and the remaining CaO after sulfur fixation increased the pH of flotation pulp and the concentration of Ca 2+ increased . The result of flotation test shows that with the increase of calcination temperature, the carbonaceous matter is gradually removed and the surface properties of minerals are widened. The flotation effect of decarburized sample is obviously improved compared with the original ore. 650 ℃ decarbonization-like flotation, due to the activation of Ca ~ (2+), the quartz was collected by sodium oleate, the yield was 21.10%, V_2O_5 grade 0.36% tailings products, the vanadium loss rate was only 10.05%, V_2O_5 grade of concentrate is 0.95%. At 700 ℃ decarburization, the high pH and Ca2 + content of the pulp cause the selective precipitation of fine particles, which consumes a large amount of sodium oleate, which is unfavorable to flotation.