The invention discloses a method for preparing
lanthanum oxide through
microwave calcination, and relates to the technical field of
rare earth metal smelting. The method for preparing the
lanthanum oxide through the
microwave calcination, provided by the invention, comprises the steps of heating
lanthanum salt to 1050-1250 DEG C in stages under a
microwave condition, calcinating and cooling to obtain the
lanthanum oxide after completion of the
calcination, wherein the heating rate is kept at a
constant rate, and heat preservation is needed after the temperature is raised to each temperature stage. By the method, characteristics of absorbing microwave by
lanthanum carbonate or lanthanum
oxalate are utilized, the
lanthanum oxide is prepared in a staged-heating microwave calcination way, thedefects of long
production cycle, low heat efficiency, and difficult guarantee of the product purity and the product
granularity due to under-burning or over-burning during production of the lanthanumoxide in the conventional calcination way are overcome, and advantages of environment friendliness, high efficiency and easiness in achievement of industrial production are achieved; meanwhile, in the staged-heating way, the
decomposition rate of a
raw material is controlled, so that the
granularity distribution of the product is optimized, and the product quality is improved.