Study on calcification reduction sodium removal of vanadium extraction tailings by coal-based rotary kiln method
In view of the high sodium content in vanadium extraction tailings,which leads to the diffi-culty of returning to the sintering-blast furnace process for recycling,herein we proposed a calcification reduction sodium removal technology route for vanadium extraction tailings based on coal-based rotary kiln reduction,and conducted a semi-industrial test on a Ø1 m×10 m rotary kiln pilot line.The influ-ence of reduction time in the high temperature section,white ash ratio,into the kiln ton-ball coke ratio and high temperature reduction time on vanadium extraction tailings sodium removal was mainly stud-ied.At the same time,the performance of pellets after desalination and the situation of kiln formation in the rotary kiln were analyzed.Under the conditions of high temperature section temperature of 1 100～1 160 ℃,high temperature section time of 1.8～2 h,into the kiln ton-ball coke ratio of 800～1 000 kg,white ash ratio of 32.5％～41％,the sodium removal rate of vanadium extraction tailings can reach more than 80％,and the coke consumption is 359 kg.The agglomeration in the kiln is mainly composed of vanadium extraction tailings pellet powder and coke ash powder.The agglomeration is loose and por-ous,consisting of fine particles which are sticky to each other.The agglomeration will fall off automat-ically during the kiln rotation process,without obvious kiln formation phenomenon.
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