Method for producing polyaluminium chloride

Abstract

The invention relates to a method for producing polyaluminium chloride, which comprises the following steps: adding aluminum-containing waste residue into solution of hydrochloric acid and reacting at 90 to 120 DEG C and under a normal pressure for 3 to 5 hours; filtering, collecting mother solution, filling the mother solution into an acid-resistance and vapor-heated reactor with a stirring device, starting stirring, supplying a proper amount of water, starting to add calcium aluminate powder, and after the addition is finished, regulating the density of feed liquid to more than or equal to 1.20g / ml with water; and adding a synergist, heating and keeping the temperature between 90 and 120 DEG C, reacting at normal temperature for 3 to 5 hours, and obtaining finished liquid polyaluminium chloride. Compared with the prior art, the method, which uses aluminum-containing waste residue obtained after the neutralization of waste liquid from surface pickling of aluminum ingots and bands as raw material, reduces the manufacturing cost of polyaluminium chloride, recycles aluminum-containing waste residue and is in accordance with the environmental-protection concept of energy conservationand emission reduction.

Description

technical field [0001] The invention relates to a production method of polyaluminum chloride. Background technique [0002] With the rapid development of industrial production, the pollution of water resources is increasing, which leads to the increasing shortage of drinking water resources. There are many types of pollutants in water, and the water contains a large number of toxic and harmful substances. They are absorbed by soil, animals and plants, or directly passed through Drinking water enters the human body and causes long-term harm to humans. Therefore, how to purify water resources has become a very urgent problem. [0003] Polyaluminum chloride is a high-efficiency inorganic polymer coagulant, which has the advantages of high efficiency, low consumption, low price, and convenience. Its water purification effect far exceeds other water purification agents such as ferric chloride and aluminum sulfate. In the prior art, the manufacture of polyaluminum chloride usuall...

AI Technical Summary

Problems solved by technology

These manufacturing methods generally have the following three disadvantages: one is that the raw materials used are conventional chemical raw materials, resulting in relatively high manufacturing costs; The product quality indicators such as coagulation ability, storage stability, pH value and alumina content are poor; the third is the relatively high content of water-insoluble matter, which greatly limits its application

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