Method for recycling zinc oxide waste desulfurizers and co-producing ammonium sulfate
A technology of zinc oxide and ammonium sulfate, applied in the field of desulfurizers, can solve the problems of high zinc loss rate, high treatment cost, serious environmental pollution, etc., and achieve the effect of improving the recycling rate and avoiding the loss of zinc
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[0028] Example 1
[0029] (1) Roast 100g zinc oxide desulfurization waste agent at 850°C to obtain inactive zinc oxide materials;
[0030] (2) Dissolve the inactive zinc oxide material in the step (1) in water to prepare an inactive zinc oxide slurry with a concentration of 20wt%, and add sulfuric acid with a volume concentration of 40% to the inactive zinc oxide slurry , Wherein the molar ratio of zinc ions in the inactive zinc oxide slurry to the sulfuric acid is 1:1, and after the reaction is completed, it is filtered to obtain a filter residue and a zinc sulfate filtrate;
[0031] (3) Add solid ammonium bicarbonate to the zinc sulfate filtrate in the step (2), wherein the molar ratio of zinc ions in the zinc sulfate filtrate to the ammonium bicarbonate is 1:2, at 30°C During the reaction, control the pH of the solution to 6.8 until the end of the reaction;
[0032] (4) Keep the pH of the solution after the reaction in step (3) unchanged at 6.8, raise the temperature of the soluti...
Example Embodiment
[0035] Example 2
[0036] (1) Roast 100g of zinc oxide desulfurization waste agent at 860°C to obtain inactive zinc oxide materials;
[0037] (2) The inactive zinc oxide material in step (1) is dissolved in water to prepare an inactive zinc oxide slurry with a concentration of 22wt%, and sulfuric acid with a volume concentration of 45% is added to the inactive zinc oxide slurry. , Wherein the molar ratio of zinc ions in the inactive zinc oxide slurry to the sulfuric acid is 1.02:1, and after the reaction is completed, it is filtered to obtain a filter residue and a zinc sulfate filtrate;
[0038] (3) Add solid ammonium bicarbonate to the zinc sulfate filtrate in the step (2), wherein the molar ratio of zinc ions in the zinc sulfate filtrate to the ammonium bicarbonate is 1:2.1, at 32°C During the reaction, control the pH of the solution to 6.8 until the end of the reaction;
[0039] (4) Keep the pH value of the solution after the reaction in the step (3) unchanged at 6.8, raise the ...
Example Embodiment
[0042] Example 3
[0043] (1) Roast 100g of zinc oxide desulfurization waste agent at 870°C to obtain inactive zinc oxide materials;
[0044] (2) Dissolve the inactive zinc oxide material in step (1) in water to prepare an inactive zinc oxide slurry with a concentration of 25wt%, and add sulfuric acid with a volume concentration of 48% to the inactive zinc oxide slurry , Wherein the molar ratio of zinc ions in the inactive zinc oxide slurry to the sulfuric acid is 1:1, and after the reaction is completed, it is filtered to obtain a filter residue and a zinc sulfate filtrate;
[0045] (3) Add solid ammonium bicarbonate to the zinc sulfate filtrate in the step (2), wherein the molar ratio of zinc ions in the zinc sulfate filtrate to the ammonium bicarbonate is 1:2.2, at 32°C During the reaction, control the pH of the solution to 6.9 until the end of the reaction;
[0046] (4) Keep the pH value of the solution after the reaction in the step (3) unchanged at 6.9, raise the solution temp...
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