504results about "Manganese sulfates" patented technology

The invention discloses a method for preparing MnSO4.H2O by performing flue gas desulphurization on a medium-and-low-grade MnO2 ore, which comprises the steps of: preparing medium-and-low-grade MnO2 ore powder into slurry; aerating sulfur-bearing flue gas into an absorption device; controlling a gas velocity and a gas-liquid ratio; then adding the MnO2 slurry into the absorption device; controlling the Mn2O slurry to flow reversely relative to the sulfur-bearing flue gas; discharging desulfurized flue gas from the absorption device; filter-pressing and separating the slurry discharged from the absorption device; returning mother solution to the absorption device; continuing the returning operation until the [MnSO4.H2O] in the mother solution is more than or equal to 200 g / L; stirring and washing an obtained filter cake at the temperature of between 60 and 70 DEG C; regulating the pH value of settled solution obtained by filtering-pressing and separating to be between 2 and 4; adding manganous sulfide under stirring at the temperature of between 25 and 95 DEG C; filtering the mixture and removing impurities from the mixture; continuing stirring the mixture; filter-pressing and separating the mixture; evaporating the obtained settled solution; and drying by the air stream to obtain the MnSO4.H2O. The method improves desulphurization efficiency, reduces the production cost for the manganous sulfate, and improves the recovery rate of total manganese, thereby recycling valuable metals efficiently.

The invention provides a method for preparing high-purity manganese sulfate. The method comprises that: an impurity-containing manganese sulfate solid is prepared into a solution of manganese sulfate, or manganese ores are leached by sulfuric acid to obtain the solution of manganese sulfate, and the solution of manganese sulfate is added with an impurity removing agent, namely MnF2 to remove impurities such as Ca and Mg, and added with MnS or metal manganese powder which is used as an impurity removing agent for removing heavy metal impurities so as to avoid the introduction of impurities, ensure the impurity removing effect and simultaneously control the pH value to be between 3.5 and 7 in the reaction. The impurity removing agents of the MnF2 and MnS or metal manganese powder can be added at the same time or in order, and then the solution of manganese sulfate is subjected to filtering, normal-pressure concentration, crystallization, dewatering and drying to obtain the high-purity manganese sulfate product. The method has the advantages that: the contents of impurities such as Ca and Mg and heavy metals in the solution of manganese sulfate, which is obtained by using the sulfuric acid to leach the common manganese sulfate product or manganese ores, are obviously reduced, and the contents of Ca, Mg and heavy metal impurities are lower than 50ppm, and the purity of the prepared manganese sulfate reaches more than 99 percent, so that the manganese sulfate prepared by the method can meet the needs for ternary materials in the electronic industry.