CN1206748A - Process for regenerating accumulator desulfurating agent - Google Patents

Abstract

The present invention provides a new method for regeneration of accumulator desulfurizer. Firstly, it uses ammonium sulfate and calcium hydroxide to make them react to produce calcium sulfate and ammonia water, then uses the ammonia water to absorb carbon dioxide so as to beatle to reproduce desulfurizer ammonium carbonate. Its regeneration process is simple, requirement for equipment is low, and the calcium hydroxide is used as raw material for regeneration, so its production cost is low, therefore it is suitable for extensive application.

Description

Method for regenerating accumulator desulfurizer

The invention relates to a method for regenerating a storage battery desulfurizer, in particular to a novel method for regenerating ammonium carbonate by using ammonium sulfate generated after the storage battery is desulfurized.

The waste storage batteries contain a large amount of lead sulfate, if the lead sulfate is not removed, a large amount of sulfur dioxide is generated in the lead recovery process to pollute the environment, and on the other hand, the existence of the lead sulfate also forces the smelting temperature to be increased, so that the energy consumption is increased. In order to avoid the influence ofthe existence of sulfur on lead recovery smelting, a desulfurization process is generally added in the existing lead recovery process before smelting, a desulfurizer solution can adopt an ammonium carbonate solution, an ammonium sulfate solution is generated after desulfurization, the ammonium sulfate needs to be regenerated into the ammonium carbonate in order to reduce the cost and realize the recycling of the ammonium carbonate, in addition, the generated ammonium sulfate needs to be regenerated into the ammonium carbonate in certain industrial processes except lead recovery, however, no effective solution is provided at present.

The invention aims to provide a novel ammonium sulfate regenerated ammonium carbonate method which is simple in process, low in cost and high in conversion rate.

The purpose of the invention is realized as follows:

(1) firstly, putting the ammonium sulfate solution generated after desulfurization into a reaction kettle, adding calcium hydroxide, and reacting for 0.5-4 hours under the condition of heating or stirring to generate calcium sulfate and ammonia water;

(2) absorbing carbon dioxide by ammonia water to obtain ammonium carbonate solution.

The method adopts the calcium hydroxide for regenerating the ammonium sulfate, has low cost, simple whole process equipment, less by-products of reaction and high conversion rate, thereby having high practicability and being convenient for popularization and application.

The following examples are provided to describe the details of the present invention.

Example 1

Firstly, putting the ammonium sulfate solution generated after desulfurization into a reaction kettle, adding calcium hydroxide, reacting for 1-2 hours under the condition of heating or stirring to generate calcium sulfate precipitate and ammonia water, wherein the conversion rate of converting the ammonium sulfate into the ammonia water in the reaction is 80%, and the chemical reaction is as follows:

filtering to remove calcium sulfate precipitate to obtain ammonia water, and absorbing carbon dioxide with ammonia water to obtain ammonium carbonate solution. The conversion rate of the ammonia water into ammonium carbonate in the reaction is 100%, and the chemical reaction is as follows:

example 2

Putting the desulfurized solution ammonium sulfate into a reactor, adding calcium hydroxide, introducing steam to heat the solution for 0.8 hour, and simultaneously combining the steam with ammonia gas volatilized from the solution to form ammonia water, wherein the conversion rate of converting the ammonium sulfate into the ammonia water in the reaction is 80 percent, and the chemical reaction is as follows:

leading out the generated ammonia water, mixing the ammonia water with carbon dioxide, leading the ammonia water to react to generate ammonium carbonate, and leading the ammonium carbonate into an absorption tank to obtain ammonium carbonate solution, wherein the conversion rate of the ammonia water converted into the ammonium carbonate is 100%, and the chemical reaction is as follows:

Claims (1)

1. a method for regenerating a storage battery desulfurizer is characterized by comprising the following steps:

(1) firstly, putting the ammonium sulfate solution generated after desulfurization into a reaction kettle, adding calcium hydroxide, and reacting for 0.5-4 hours under the condition of heating or stirring to generate calcium sulfate and ammonia water;

(2) absorbing carbon dioxide by ammonia water to obtain ammonium carbonate solution.