A kind of alum production process

A production process and technology of alum, applied in the field of alum production process, can solve problems such as unrecyclable mother liquor, environmental and water source pollution, pumps, pipelines, and containers cannot be used normally, so as to ensure continuous flow, reduce waste discharge, and improve production efficiency effect

CN106277010BActive Publication Date: 2018-04-10淄博市淄川程鹏化工厂
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-04-10
Patent Text Reader

Abstract

The invention relates to an alum production process which is characterized by comprising the following steps: firstly adding water and aluminum hydroxide into a reaction kettle, then stirring for 27-35 minutes and finally adding sulfuric acid; enabling reaction for 1.7-2.3 hours, adding potassium sulfate or ammonium sulfate into the reaction kettle, keeping a stirring state and reacting for 27-35 minutes to obtain slurry; directly putting the slurry of 95-105 DEG C obtained in the step 2) into a crystallizing line with a total length of 29.5-31 meters at a rate of 1.6-2.5 m<3> / h for crystallization, arranging a circular cooling water path on the crystallizing line, and cooling and crystallizing the slurry in the crystallizing line in the flowing process. The alum production process provided by the invention has the benefits that the crystallization process is completed in the flowing process by adopting the long crystallizing line; the process is continuously performed, so that the production efficiency is greatly improved, the waste discharge is reduced, and the environmental friendliness is achieved.
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Description

technical field

[0001] The invention discloses an alum production process, which belongs to the technical field of alum crystallization. Background technique

[0002] The more commonly used method in the current alum production method is the bauxite method, which uses sulfuric acid to decompose bauxite ore to produce aluminum sulfate solution, and then reacts with potassium sulfate, then filters, crystallizes, centrifugally dehydrates, and dries to obtain aluminum potassium sulfate products. The specific steps of this prior art are: add a certain amount of water to the reaction kettle in proportion, then put in bauxite (about 60 mesh) for stirring, put in a certain amount of sulfuric acid after about 30 minutes, seal the reaction kettle, and wait for the reaction. When water and sulfuric acid react, a large amount of heat will be released. At this time, the exhaust valve of the reactor is opened to control the pressure below 3.5MPa. After the pressure is stable, close the v...

Examples

Embodiment 1

[0023] 1) First add water and aluminum hydroxide to the reactor, stir for 30 minutes and then add sulfuric acid. The mass ratio of water, aluminum hydroxide and sulfuric acid is 27:9.6:31.2;

[0024] 2) After reacting for 2 hours, put potassium sulfate into the reaction kettle and keep stirring for another 30 minutes to obtain a slurry, wherein the mass ratio of the added mass of potassium sulfate to the mass ratio of sulfuric acid added in step 1) is 22.8:31.2;

[0025] 3) Press the 100°C slurry obtained in step 2) directly to 2.0m 3 The rate of / h is placed in the crystallization line for crystallization. The crystallization line is 30 meters long, 1.2 meters wide, and 1.0 meters high. There are 10 exhaust fans arranged equidistantly above the crystallization line, and a circulating cooling water circuit is set above the crystallization line. Crystallization The line is equipped with a circulating cooling water channel, and the slurry is cooled and crystallized during the fl...

Embodiment 2

[0028] 1) First add water and aluminum hydroxide to the reactor, stir for 29 minutes and then add sulfuric acid. The mass ratio of water, aluminum hydroxide and sulfuric acid is 27:9.3:31.4;

[0029] 2) After reacting for 1.9 hours, put potassium sulfate into the reactor and keep stirring for another 29 minutes to obtain a slurry, in which the mass ratio of the added mass of potassium sulfate to the mass ratio of sulfuric acid added in step 1) is 22.5:31.4;

[0030] 3) Press the 97°C slurry obtained in step 2) directly into 1.8m 3 The rate of / h is placed in the crystallization line for crystallization. The crystallization line is 29.7 meters long, 1.17 meters wide, and 0.97 meters high. There are 12 exhaust fans arranged equidistantly above the crystallization line. The line is equipped with a circulating cooling water channel, and the slurry is cooled and crystallized during the flow in the crystallization line;

[0031] 4) The water storage tank is preheated by the reactio...

Embodiment 3

[0033] 1) First add water and aluminum hydroxide to the reactor, stir for 33 minutes and then add sulfuric acid. The mass ratio of water, aluminum hydroxide and sulfuric acid is 27:9.8:31.7;

[0034] 2) After reacting for 2.1 hours, put ammonium sulfate into the reaction kettle and keep stirring for another 33 minutes to obtain a slurry, wherein the mass ratio of the ammonium sulfate added to the sulfuric acid added in step 1) is 23.5:31.7;

[0035] 3) Press the 102°C slurry obtained in step 2) directly to 2.3m 3The rate of / h is placed in the crystallization line for crystallization. The crystallization line is 30.5 meters long, 1.23 meters wide, and 1.03 meters high. There are 8 exhaust fans arranged equidistantly above the crystallization line, and a circulating cooling water circuit is set above the crystallization line. Crystallization The line is equipped with a circulating cooling water channel, and the slurry is cooled and crystallized during the flow in the crystalliz...