Method for preparing manganese sulfate monohydrate by desulfurizing fume with middle-low grade manganese dioxide ore

摘要

The invention flue gas desulfurization by using MnO ₂ ore of low and medium quality MnSO ₄ and H ₂ O in the method for producing, by using the MnO ₂ of the medium and low quality ore powder to prepare a slurry, and the first sulfur was passed through a smoke containing the absorber, and then control the gas velocity and group-liquid ratio, followed by MnO ₂ introducing the slurry to flow in the opposite direction with respect to the sulfur-containing smoke, and a smoke after desulfurization absorber discharging and separating the slurry discharged from the absorber from the compression filtered, and the mother liquid back to the absorber, the mother liquor of the [MnSO ₄ ] Repeat this operation until a return 200g / L and, was obtained from the filter cake was washed by stirring for 60-70 , compression filtration, and the resulting clear solution was adjusted to pH = 2-4 and then, 25 -95 in the addition of manganese sulphide in a stirred state, and filtered to give After removing the impurities by filtration, compression, and stirring was continued, and evaporated to give a clear filtrate, and air dried MnSO ₄ and H _{to give the 2} O. According to the present invention, increase the desulfurizing efficiency and increase the overall recovery of manganese sulfate, manganese lowers the production cost and the valuable metals can be recovered with high efficiency. ;