Preparation of Sodium Tungstate from Waste Catalyst Containing Tungsten and Nickel
Sodium tungstate was prepared by roasting plus sodium-leaching-ion exchange and with waste tungsten-nickel hydrogenation catalyst as the raw material.
The results show that the tungstate leaching rate from waste catalyst can reach 99% when the catalyst grinding size is 0.15 mm,the ratio of Na2CO3 dosage to WO3 dosage 0.69,leaching temperature 90 ℃,and leaching time 1 h. The saturation ion-exchange capacity of WO3 is 332.9 gWO3/L-dry resin with the method of serial column absorption. The WO3 desorption rate is 98.2% with 2 mol/L NaCl and 1 mol/L NaOH mixture solution as the desorption agent. The purity of sodium tungstate is 99% after recrystallization.
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