Method for preparing high-quality chromium sesquioxide

The invention discloses a method for preparing high-quality chromium sesquioxide. The method comprises the following steps: heating to remove water in hydrated chromic oxide, crushing to obtain chromic oxide powder, washing and decontaminating the chromic oxide powder, performing vacuum thermal treatment, thereby obtaining chromium sesquioxide. The method can be used for effectively reducing energy consumption and improving the purity of chromium sesquioxide, is simple in process, low in cost and environmental friendly, and can meet the industrialization production.