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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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.
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