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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 desulfurization waste agent in the prior art, and then provides a low processing cost Method for recycling and co-producing ammonium sulfate with zinc oxide desulfurization waste agent that is economical, environmentally friendly, and has high zinc utilization rate

Method used

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  • Method for recycling zinc oxide waste desulfurizers and co-producing ammonium sulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Roast 100g of zinc oxide desulfurization waste agent at 850°C to obtain inactive zinc oxide material;

[0030] (2) Dissolving the inactive zinc oxide material in the step (1) in water to prepare an inactive zinc oxide slurry with a concentration of 20 wt%, adding sulfuric acid with a volume concentration of 40% to the inactive zinc oxide slurry , wherein the molar ratio of zinc ions to the sulfuric acid in the inactive zinc oxide slurry is 1:1, after the reaction is completed, filter to obtain filter residue and 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 Reaction, during the reaction, the pH value of the solution is controlled to be 6.8 until the reaction is completed;

[0032] (4) Keep the pH value of the solution after the reaction in step (3) at 6.8, raise the temperature of the solutio...

Embodiment 2

[0036] (1) Roast 100g of zinc oxide desulfurization waste agent at 860°C to obtain inactive zinc oxide material;

[0037] (2) Dissolving the inactive zinc oxide material in the step (1) in water to prepare an inactive zinc oxide slurry with a concentration of 22wt%, adding sulfuric acid with a volume concentration of 45% to the inactive zinc oxide slurry , wherein the molar ratio of zinc ions to the sulfuric acid in the inactive zinc oxide slurry is 1.02:1, after the reaction is completed, filter to obtain filter residue and 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 Reaction, during the reaction, the pH value of the solution is controlled to be 6.8 until the reaction is completed;

[0039] (4) Keep the pH value of the solution after the reaction in step (3) at 6.8, raise the temperature of the so...

Embodiment 3

[0043] (1) Roast 100g of zinc oxide desulfurization waste agent at 870°C to obtain inactive zinc oxide material;

[0044] (2) Dissolving the inactive zinc oxide material in the step (1) in water to prepare an inactive zinc oxide slurry with a concentration of 25 wt%, adding sulfuric acid with a volume concentration of 48% to the inactive zinc oxide slurry , wherein the molar ratio of zinc ions to the sulfuric acid in the inactive zinc oxide slurry is 1:1, after the reaction is completed, filter to obtain filter residue and 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 Reaction, during the reaction, the pH value of the solution is controlled to be 6.9 until the end of the reaction;

[0046] (4) Keep the pH value of the solution after the reaction in step (3) at 6.9, raise the temperature of the soluti...

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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.

Description

technical field [0001] The invention relates to a method for recycling zinc oxide desulfurization waste agent and co-producing ammonium sulfate, belonging to the technical field of desulfurization agents. Background technique [0002] Zinc oxide desulfurizer occupies an important position in the field of industrial fine desulfurization because of its high desulfurization precision, easy to use, stable and reliable performance, and is widely used in synthetic ammonia, hydrogen production, synthetic methanol, coal chemical industry, petroleum refining and other industries. During the desulfurization process, the zinc oxide desulfurizer interacts with the H in the material to be desulfurized 2 S undergoes a chemical reaction to generate ZnS, which solidifies the gaseous sulfur in the stream to be desulfurized to achieve the purpose of desulfurization, and most of the zinc oxide after desulfurization is converted into ZnS and loses its activity. Nearly 10,000 tons of zinc oxide...

Claims

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Application Information

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IPC IPC(8): C01G9/02C01C1/244B01D53/96B01D53/52
Inventor 王立贤白洪彬邱新荣王春艳杜鹃刘振义
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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