焙烧脱碳对含钒石煤相变及浮选行为的影响

发布时间：2018-01-11 21:43

  本文关键词：焙烧脱碳对含钒石煤相变及浮选行为的影响　出处：《稀有金属》2016年08期 　论文类型：期刊论文

  更多相关文章： 高钙 含钒石煤 焙烧脱碳 浮选 Ca+活化

【摘要】：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。
[Abstract]:The minerals in a high calcium mica type vanadium bearing stone coal in Hubei Province are soaking deeply by carbonaceous material, which needs to be roasted for decarbonization before flotation. The TG-DSCC (TG-DSCN) and FTIRs are obtained by thermogravimetric differential scanning calorimetry (TG-DSCN). The decarburization samples of raw ore and calcined at different temperatures were characterized by means of X-ray diffraction and XRD, and the effects of decarbonization at different temperatures on flotation behavior were discussed. With the increase of calcination temperature, pyrite oxidation, carbonaceous combustion, calcite decomposition and so on occurred at 700 鈩，

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