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A technology of manganese sulfate and manganese sulfate solution, applied in the direction of manganese sulfate, etc., can solve the problems that affect the application, low added value, and cannot use ternary materials
Inactive Publication Date: 2009-04-22
湖北开元化工科技股份有限公司
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[0002] Manganese sulfate solid (containing reagent-grade manganese sulfate solid) prepared by common method or manganese sulfate solid prepared by common method from manganese sulfate solution leached by manganese ore with sulfuric acid, its Ca, Mg impurities and heavy metal impurities (Co, Ni, Pb, etc.) content is high, among which Ca, Mg content can reach about 5000ppm, and heavy metal impurities (Co, Ni, Pb, Cd, Cr, etc.) content can reach about 300ppm. About 500-1000ppm, with general impurity remover, even if the content of Ca, Mg impurities and heavy metal impurities (Co, Ni, Pb, etc.) can be reduced, the prepared manganese sulfate product is not high in purity, and the product quality cannot reach electronic grade products requirements, and cannot be used as raw materials for ternary materials in the electronics industry
As a result, its product quality is not high and its added value is not high, which affects its application
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[0007] A preparation method of high-purity manganese sulfate, the manganese sulfate solid containing impurities is formulated into a manganese sulfate solution or the impurity remover MnF is added to the manganese sulfate solution after manganese ore is leached with sulfuric acid 2 , to remove calcium, magnesium impurities, MnF 2 The dosage is 100%-200% of the theoretical amount of impurities, maintain the pH value of the solution at 4-10, and keep it at a temperature of 40°C-100°C for 0.5 hours-2 hours, then add impurity remover MnS or metal manganese powder to remove Co, Ni, Pb, Cd or Cr heavy metal impurities, the amount of MnS or metal manganese powder is 100%-200% of the theoretical amount of impurities, maintain the pH value of the solution at 4-10, and keep the reaction at a temperature of 40°C-100°C 0.5 hours - 2 hours, with MnF 2 Using MnS or metal manganese powder as impurity remover can avoid the introduction of impurities and ensure the effect of impurity removal....
Embodiment 1
[0012] 200gMnSO 4 Add water to dissolve to 500ml, heat and stir to raise the temperature to 80°C, add 20gMnF 2 Solid, keep the pH value of the solution at 6.5, keep stirring for 1 hour, then add 3gMnS, stir and keep warm for 0.5 hour, filter, concentrate, crystallize, dehydrate and dry the filtrate to obtain 195g of high-purity manganese sulfate product, and analyze the content of manganese sulfate to be 99.7 %.
Embodiment 2
[0014] 500gMnSO 4 Add water to dissolve to 10L, heat and stir to raise the temperature to 40°C, add 50gMnF 2 Solid, then add 7g metal manganese powder to keep the pH value of the solution at 8.0, keep stirring for 2 hours, filter, concentrate the filtrate, crystallize, dehydrate, and dry to obtain 470g of high-purity manganese sulfate product, the manganese sulfate content is 99.5%.
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Abstract
The invention provides a method for preparing high-purity manganese sulfate. The method comprises the following steps: preparing a manganese sulfate solid containing impurities into a manganese sulfate solution, or leaching manganese ore in sulfuric acid to obtain the manganese sulfate solution; adding an impurity removing agent MnF2 into the manganese sulfate solution to remove impurities which are Ca and Mg; using MnS or metal manganese powder as the impurity removing agent to remove heavy metal impurities so as to avoid the introduction of impurities and ensure the effect of impurity removal, and simultaneously controlling the pH value for reaction to between 4 and 10. The impurity removing agent MnF2 and MnS or the metal manganese powder can either be simultaneously added, or added one after another respectively to obtain the high-purity manganese sulfate through filtering, concentrating at normal pressure, crystallizing, dehydrating and drying. The method has the advantages that the method can obviously reduce the amount of Ca and Mg impurities and heavy metal impurities contained in a common manganese sulfate product or the manganese sulfate solution after the manganese ore is leached by sulfuric acid, and ensure that the content of Ca and Mg is lower than 100 ppm, and the content of the heavy metal impurities is lower than 50 ppm, and purity of the obtained manganese sulfate product can reach over 99 percent to meet the requirement of the manganese sulfate product used for ternary materials in the electronic industry.
Description
technical field [0001] The invention relates to a method for preparing high-purity manganese sulfate, in particular to a method for preparing high-purity manganese sulfate by utilizing ordinary manganese sulfate solid or manganese sulfate solution leached with sulfuric acid. Background technique [0002] Manganese sulfate solid (containing reagent-grade manganese sulfate solid) prepared by common method or manganese sulfate solid prepared by common method from manganese sulfate solution leached by manganese ore with sulfuric acid, its Ca, Mg impurities and heavy metal impurities (Co, Ni, Pb, etc.) content is high, among which Ca, Mg content can reach about 5000ppm, and heavy metal impurities (Co, Ni, Pb, Cd, Cr, etc.) content can reach about 300ppm. About 500-1000ppm, with general impurity remover, even if the content of Ca, Mg impurities and heavy metal impurities (Co, Ni, Pb, etc.) can be reduced, the prepared manganese sulfate product is not high in purity, and the produc...
Claims
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