The synthesis reactor to join the dilute solution of zinc residue dissolved
in 18% sulfuric acid, zinc oxide (or zinc raw materials) and transferred into a
slurry was added with stirring. And then adding sulfuric acid, the reaction in
the acid reactor with stirring, control Ph5.1 is the reaction end point, a
concentration of about 38 ° Bé. Reaction mixture by filtration, the liquid is
heated to 80 ° C, the addition of zinc powder to displace copper, cadmium,
nickel, and then filtered, the filtrate was heated to above 80 ℃, by adding
potassium permanganate (or bleach) and heated to boiling, impurities such as
iron, manganese oxide, After filtration, the filtrate first clarify, and then
evaporated to 49 ~ 52 ° Bé, cooling and crystallization, centrifugal dewatering,
drying, obtained heptahydrate zinc sulphate. Its
ZnO + H2SO4 → of ZnSO4 + H2O
Slowly added zinc material in a dilute sulfuric acid of relative density of 1.16, the temperature was controlled at 80 ~ 90 ° C, the solution after about 2h Ph value of 5.1 to 5.4, the reaction is completed, then the solution relative density of about 1.35; then add a small amount of potassium permanganate potassium or bleach, iron, manganese oxide precipitation, filtration, Spoil the filtrate into the replacement barrel, adding a small amount of zinc powder, 75 ~ 90 ° C under stirring for 40 ~ 50min, the replacement of copper, lead, cadmium and other heavy metal impurities. After filtration, the filtrate was then a small amount of potassium permanganate or bleach oxidation, further remove small amounts of iron, manganese, filtering the relative density of 1.28 to 1.32 of the zinc sulfate solution. This solution, after cooling in the mold pot crystallization 2 ~ 3d, fractional crystallization, drying, drying in the 40 ~ 50 ℃ finished.
ZnO + H2SO4 → of ZnSO4 + H2O
In the relative density of 1.16, dilute sulfuric acid was slowly added zinc material, the temperature was controlled at 80-90 ℃, about 2h after the solution PH 5.1-5.4, the reaction is completed, then the solution relative density of about 1.35. Then add a small amount of potassium permanganate Lake bleach, iron, manganese oxide precipitation, filtration spoil the filtrate into the replacement barrel, adding a small amount of zinc powder, mixing 40-50min, 75-90 ℃, the replacement of copper, lead, chromium heavy metal impurities. After filtration, the filtrate was then a small amount of potassium permanganate or bleach oxidation, further remove small amounts of iron, manganese, and filtering the relative density of 1.28-1.32 of zinc sulfate solution. This solution after cooling in the mold pot crystallization of 2-3 days, fractional crystallization, drying, drying in the 40-50 ℃ finished.
ZnO + H2SO4 → of ZnSO4 + H2O
Slowly added zinc material in a dilute sulfuric acid of relative density of 1.16, the temperature was controlled at 80 ~ 90 ° C, the solution after about 2h Ph value of 5.1 to 5.4, the reaction is completed, then the solution relative density of about 1.35; then add a small amount of potassium permanganate potassium or bleach, iron, manganese oxide precipitation, filtration, Spoil the filtrate into the replacement barrel, adding a small amount of zinc powder, 75 ~ 90 ° C under stirring for 40 ~ 50min, the replacement of copper, lead, cadmium and other heavy metal impurities. After filtration, the filtrate was then a small amount of potassium permanganate or bleach oxidation, further remove small amounts of iron, manganese, filtering the relative density of 1.28 to 1.32 of the zinc sulfate solution. This solution, after cooling in the mold pot crystallization 2 ~ 3d, fractional crystallization, drying, drying in the 40 ~ 50 ℃ finished.
ZnO + H2SO4 → of ZnSO4 + H2O
In the relative density of 1.16, dilute sulfuric acid was slowly added zinc material, the temperature was controlled at 80-90 ℃, about 2h after the solution PH 5.1-5.4, the reaction is completed, then the solution relative density of about 1.35. Then add a small amount of potassium permanganate Lake bleach, iron, manganese oxide precipitation, filtration spoil the filtrate into the replacement barrel, adding a small amount of zinc powder, mixing 40-50min, 75-90 ℃, the replacement of copper, lead, chromium heavy metal impurities. After filtration, the filtrate was then a small amount of potassium permanganate or bleach oxidation, further remove small amounts of iron, manganese, and filtering the relative density of 1.28-1.32 of zinc sulfate solution. This solution after cooling in the mold pot crystallization of 2-3 days, fractional crystallization, drying, drying in the 40-50 ℃ finished.
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