在石煤工艺矿物学的基础上，采用焙烧?浮选新工艺富集石煤中的钒。新工艺包括焙烧脱碳、选择性磨矿、脱泥和浮选4个关键步骤。在焙烧脱碳过程中，550°C焙烧脱碳能有效避免原矿中的碳质物和焙烧中方解石分解生成游离CaO对浮选产生的不利影响。通过选择性磨矿，高耗酸性矿物在中间粒级富集，而云母在细粒级和粗粒级中富集。浮选得到的最终精矿V2O5的品位为1.07%，回收率为83.30%。此外，最终精矿的钒浸出率相比于脱碳样提高了13.53%。石煤原矿在550°C焙烧脱碳是可行的，对云母浮选几乎没有不利影响。通过对石煤中钒的浮选预富集，可以降低提钒的处理量、酸耗量和生产成本。
A new process for vanadium recovery from stone coal by roasting?flotation was investigated based on the mineralogy. The process comprised four key steps: decarburization, preferential grinding, desliming and flotation. In the decarburizationstage, roasting at 550°C effectively avoided the negative effect of the carbonaceous materials in raw ore and generation of free CaO from calcite decomposition during roasting.Through preferential grinding, the high acid-consuming minerals were enriched in the middle fractions, while mica was enriched in the fine and coarse fractions. Through flotation, thefinal concentrate can be obtained with V2O5grade of 1.07% and recovery of 83.30%. Moreover,the vanadium leaching rate of the final concentrate increased 13.53%compared to that of the feed. The results reveal thatthe decarburization by roasting at 550 °C is feasible and has little negative impact on mica flotation,and vanadium recovery from stone coal is conducive to reducinghandling quantity, acid consumption and production cost.
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