A kind of alum production process

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.

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...

AI Technical Summary

Problems solved by technology

[0004] The above methods need to be heated by boiler or gas when producing aluminum potassium sulfate. After cooling down and crystallizing into finished products, centrifugal dehydration will generate a large amount of mother liquor that cannot be recovered, causing pollution to the environment and water sources. After the materials are mixed, they are easy to crystallize, causing the pumps, pipelines, containers, etc. to not be used normally, so the mother liquor cannot be recovered)