摘要:
根据高铬型钒渣物相特征,采用NaOH亚熔盐液相氧化法提取高铬钒渣中的钒铬,实现钒铬的高效低成本低温同步提取。系统考察NaOH亚熔盐体系反应温度、碱矿质量比、搅拌转速等工艺参数对钒渣分解过程的影响,获得最优工艺参数为:温度220℃,NaOH浓度85%,碱矿比10:1,搅拌转速950 r/min,常压通氧气流量1 L/min,反应时间6 h;钒、铬的浸出率分别达到95%和90%以上,实现了高铬钒渣中钒铬共提,为高铬型钒渣中钒铬的同步提取提供了一条可行途径,实现了钒渣的综合利用。
Abstract:
In order to realize efficient and low-cost low-temperature simultaneous extraction of vanadium and chromium from high chromium vanadium slag,NaOH sub-molten salt liquid phase oxidation was employed according to phase of the slag.After the influences of reaction temperature of NaOH sub-molten salt system,NaOH-to-ore mass ratio and speed of stirring on vanadium extraction were studied,the optimum process parameters were obtained.With the reaction temperature of 220℃,NaOH concentration of 85%,NaOH-to-ore mass ratio of 10:1,stirring speed of 950 r/min,atmospheric oxygen flow of 1 L/min and reaction time of 6 h,the leaching rates of vanadium and chromium reached 95% and 90% or above respectively,which indicates the realization of comprehensive utilization of vanadium slag.
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