The new technique on separation of Cr and Fe as well as Ni-Co-Mn impurity in leaching sulfate solution of ferrochrome alloy

The oxalic acid was employed to precipitate the ferrum, nickel cobalt and manganese from the leaching sulfate solution of ferrochrome alloy. The amount of oxalic acid, reaction temperature and terminal pH of the chromium sulfate solution were investigated. The results show that the deposition efficiency of ferrum reaches 99% and loss rate of chromium is less than 1% when 120% theoretical quantity of oxalic acid is used under 30A degrees C and terminal pH = 3. At the same time the deposition efficiencies of nickel, cobalt and manganese in the solution are 98.4, 92.2, 97.5%, respectively. The iron content of ferrous oxalate precipitated from the chromium sulfate solution reaches 30.5% with uniform particle size distribution which can be used as the raw material of lithium iron phosphate. The new technique can solve the problem of separating the high content iron from the chromium sulfate solution, and the elements in the ferrochrome can be used comprehensively. So the new technique has a good industrial application prospect. -Oxalic acid was employed to separate iron in chromium sulfate solution. -Nickel,cobalt and manganese in chromium sulfate solution were coprecipitated with the iron. -A comparative study on metal separation behaviors was carried out. -FeC2O4 was obtained from chromium sulfate solution, and the metals separation was sufficient.