Method for preparing battery-grade lithium carbonate from low-grade lithium phosphate

The invention provides a method for preparing battery-grade lithium carbonate from low-grade lithium phosphate, and belongs to the technical field of chemical engineering. The lithium carbonate is prepared from a low-grade lithium phosphate solid raw material, and the method comprises the following process steps: mixing and burdening, microwave roasting, leaching treatment, filtering and impurity removal, and centrifugal washing. According to the method, a large number of impurities in the low-grade lithium phosphate solid raw material are removed through pretreatment roasting, the technological process is short, operation is easy, and the prepared lithium carbonate belongs to battery-grade lithium carbonate and is high in resource utilization rate. 本发明就是要提供一种低品位磷酸锂制备电池级碳酸锂的方法，属于化工技术领域。本发明从低品位磷酸锂固体原料制备碳酸锂，采用如下工艺步骤：混合配料、微波焙烧、浸出处理、过滤除杂、离心洗涤。本发明通过预处理焙烧，去除低品位磷酸锂固体原料中的大量杂质，工艺流程短，易于操作，且制成的碳酸锂属于电池级碳酸锂，资源化利用率高。