Chromate is one of the important basic raw materials in the chemical andmetalluraical, which accounted for70%of chromium salt production. The conventionalmanufacture method of chromium salts is the process of “calcium roasting of chromite”,Which has the disadvantages of low energy efficiency and high environmental pollution.Accordingly, it is gradually being replaced by the cleaner processes, e.g. calcium-freeroasting and liquid-phase oxidation. Among them, the liquid-phase oxidation processescan achieve hi...