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

Active Publication Date: 2014-03-12

BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that there are problems of high processing cost, high waste liquid discharge, serious environmental pollution and high zinc loss rate in the recovery process of using zinc oxide desulfuri...

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Abstract

The invention provides a method for recycling zinc oxide waste desulfurizers and co-producing ammonium sulfate, which comprises the following steps: roasting zinc oxide waste desulfurizers at 850-900 DEG C so as to obtain an inactive zinc oxide material; dissolving the inactive zinc oxide material in water so as to obtain fluid, adding a sulfuric acid into the fluid, and after the mixture is completely reacted, filtering the obtained product, so that filter residue and zinc sulfate filtrate are obtained; adding solid ammonium bicarbonate into the zinc sulfate filtrate, reacting at 30-40 DEG C, and in the process of reacting, controlling the pH value of the solution to be 6.8-6.9 until the reaction is completed; keeping the pH value of the solution after the reaction is completely unchanged, raising the temperature of the solution to 60-70 DEG C, and continuing to age the solution under the condition of heat preservation, so that an basic zinc carbonate filter cake and an ammonium sulfate solution are obtained; washing, drying and roasting the basic zinc carbonate filter cake so as to obtain active zinc oxide; and evaporating the ammonium sulfate solution so as to recycle ammonium sulfate. The method for recycling zinc oxide waste desulfurizers and co-producing ammonium sulfate, which is disclosed by the invention, has the advantages of low treatment cost, low environmental pollution, and high zinc recycle rate.

Application Domain

Zinc oxides/hydroxidesDispersed particle separation +1

Technology Topic

Ammonium sulfateEnvironmental chemistry +8

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Examples

Experimental program(7)
Effect test(1)

Example Embodiment

[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 solution to 60°C, continue to keep warm and age, and filter to obtain a basic zinc carbonate filter cake with a mass concentration of 20% 的ammonium sulfate solution;

[0033] (5) Evaporate and crystallize the ammonium sulfate solution in the step (4) at a temperature of 120° C. and normal pressure conditions to recover ammonium sulfate solid;

[0034] (6) After washing, drying, and roasting the basic zinc carbonate filter cake, active zinc oxide A is obtained.

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 temperature of the solution to 62°C, continue to heat and age, and filter to obtain a basic zinc carbonate filter cake with a mass concentration of 22wt% 的ammonium sulfate solution;

[0040] (5) Evaporate and crystallize the ammonium sulfate solution in the step (4) at a temperature of 120° C. and normal pressure conditions to recover ammonium sulfate solid;

[0041] (6) After washing and drying the basic zinc carbonate filter cake, it is calcined to obtain activated zinc oxide B.

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 temperature to 63°C, continue to keep warm and age, and filter to obtain a basic zinc carbonate filter cake with a mass concentration of 24wt% 的ammonium sulfate solution;

[0047] (5) Evaporate and crystallize the ammonium sulfate solution in the step (4) at a temperature of 120° C. and normal pressure conditions to recover ammonium sulfate solid;

[0048] (6) After washing and drying the basic zinc carbonate filter cake, it is calcined to obtain activated zinc oxide C.

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Classification and recommendation of technical efficacy words

Improve recycling rates

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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