Production and preparation method for solid poly-aluminum chloride

Abstract

The invention discloses a production and preparation method for solid poly-aluminum chloride. The production and preparation method comprises the following steps of: (1), heating up 1.32-1.4 tons of hydrochloric acid with concentration of 20%-30% to 90 DEG C to 110 DEG C, adding 0.55-0.6 ton of bauxite for reacting for 1-2 hours under a constant temperature; (2), adding 0.3-0.4 ton of calcium aluminate powder for polymerizing to obtain a liquid poly-aluminum chloride solution; (3), adding fluorite which is 4-5 times silica gel by weight, and reacting for 15-30 minutes under the constant temperature; (4), filtering the reacted aluminum chloride solution by a filter press; and (5), drying the filtered aluminum chloride solution at a high temperature to obtain the solid poly-aluminum chloride. According to the preparation method disclosed by the invention, silicon fluoride with low viscosity is generated by the fluorite and the silica gel with high viscosity in the silica gel reaction solution in a polymerized aluminum chloride solution in a production process, so that the filtering difficulty is greatly reduced and the filter cloth can be recycled after being cleaned, thereby shortening the production time, reducing the production cost, improving the solid content of the liquid aluminum chloride and improving the market competitiveness of the products.

Description

technical field [0001] The invention relates to a production and preparation method of a sewage treatment agent, in particular to a production and preparation method of solid polyaluminum chloride. Background technique [0002] Polyaluminum chloride is a kind of inorganic polymer coagulant. It is a purification treatment agent for purifying tap water and industrial sewage. There are many ways to synthesize it. At present, polyaluminum chloride manufacturers in the industry mostly use calcium aluminate powder Or bauxite to produce polyaluminum chloride, but due to the difference in composition characteristics and process conditions of calcium aluminate powder or bauxite itself, the final reaction liquid will contain a certain amount of water-insoluble residues, the main component of which is silica gel. Now in the industry, it is generally made into an aqueous solution after natural sedimentation or filtration. The solid content of polyaluminum chloride is low, and silica gel...

AI Technical Summary

Problems solved by technology

[0002] Polyaluminum chloride is a kind of inorganic polymer coagulant. It is a purification treatment agent for purifying tap water and industrial sewage. There are many ways to synthesize it. At present, polyaluminum chloride manufacturers in the industry mostly use calcium aluminate powder Or bauxite to produce polyaluminum chloride, but due to the difference in composition characteristics and process conditions of calcium aluminate powder or bauxite itself, the final reaction liquid will contain a certain amount of water-insoluble residues, the main component of which is silica gel. At present, the industry generally makes an aqueous solution through natural sedimentation or filtration. The solid content of polyaluminum chloride is low, and silica gel is easy to block the filter cloth during the sedimentation or filtration process. The sedimentation speed is slow and the time is long, so the effect is not good.