A kind of regeneration method of zinc oxide desulfurization waste agent

Abstract

The invention discloses a regenerating method of a zinc oxide desulfuration waste agent. The regenerating method includes the following steps that (1) aerobic roasting is carried out on the zinc oxide desulfuration waste agent, and non-activated zinc oxide materials and waste gas are obtained; (2) the waste gas is scrubbed with sulfuric acid, and a scrubbing solution is collected; (3) the non-activated zinc oxide materials and the scrubbing solution are mixed to make a replacement reaction, first-time solid-liquid separation is carried out after the reaction is finished, and a first liquid phase is obtained; (4) the first liquid phase, ammonium carbonate and / or ammonium bicarbonate react, and the pH value of a reaction system is controlled to be 7 in the reaction process until the reaction is finished; the pH value of a solution obtained after the reaction in the step (4) is finished keeps unchanged, the temperature of the solution rises to 60 DEG C to 70 DEG C, heat preservation and ageing are carried out, second-time solid-liquid separation is carried out after aging is finished, and a second solid phase is obtained; and (6) the second solid phase is subject to drying and roasting in sequence, and activated zinc oxide is obtained. The regenerating method is high in regenerating rate, and the breakthrough sulfur capacity of the activated zinc oxide obtained after regeneration is high.

Description

technical field [0001] The invention belongs to the technical field of desulfurization agents, and in particular relates to a method for regenerating zinc oxide desulfurization waste 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 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 desulfurization ...

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Problems solved by technology

[0005] The above technology first converts ZnS in zinc oxide desulfurization waste agent into ZnSO 4 , and then converted into basic zinc carbonate that can form active zinc oxide, which can avoid the 4 The presence of the regenerated desulfurizer caused by the reduction of activity, however, the above technology in the preparation of ZnSO 4 In the process of roasting zinc oxide desulfurization waste agent at a high temperature of 850-900 ° C to convert the ZnS into inactive zinc oxide, but this process will also cause part of the elemental zinc to volatilize, which also causes the loss of zinc; in addition, high-temperature roasting The generated exhaust gas will also be mixed with a part of zinc oxide desulfurization waste agent, which further causes the loss of zinc, and the above-mentioned zinc loss will eventually lead to a low regeneration rate of zinc oxide desulfurization waste agent

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