Continuous Leaching of Mixed Wolframite-Scheelite Concentrate with Soda
Experimental study was carried out on continuous leaching of mixed wolframite-scheelite concentrate with soda in a horizontal continuous autoclave reactor,and the effects of various processing parameters on the decomposition rate of the mixed ore were investigated.Under the processing conditions,including grinding fineness of-0.050 mm for the mixed ore,leaching temperature of 200℃,liquid-to-solid ratio of 2.1∶1,soda usage at four times of the theoretical dosage,addition of NaOH at 25 kg/t of ore,and feeding rate of 10 m3/h,the decomposition rate of tungsten in the mixed wolframite-scheelite concentrate reaches 99.55%,with only WO3 content of 0.28%in the slag.It is found that the continuous leaching with soda offers the advantages of easy operation,higher production efficiency,lower energy consumption,stable decomposition rate,as well as higher automation.
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