Using lanthanum chloride as the research object and ammonium bicarbonate as the precipitator,the behavior of using lanthanum chloride liquid as the research object and ammonium bicarbonate as precipitating agent,the impurity behavior of rare earth precipitating process was studied by the combination method. The effects of the type of compound,temperature,dosage of compound,amount of precipitator and reaction time on the purification of lanthanum chloride in ammonium bicarbonate system were investigated. The results show that salicylic acid has the best reaction effect. Under ammonium bicarbonate system,the optimum conditions are temperature 35 ℃,salicylic acid dosage 2.5 times of the theoretical amount,precipitation agent dosage 1.75 times of the theoretical amount,and reaction time 2.5 h. Under these conditions,the precipitation rates of iron,aluminum and lanthanum are only 0.42％,10.51％ and 99.99％,respectively. The final lanthanum oxide powder product has a purity of 99.99％.
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