Production method of polyaluminium chloride

Abstract

The invention relates to a production method of the polyaluminium chloride, which takes wastes as main materials, therefore, the production method is very beneficial to the environment and resource protection. The production method of the polyaluminium chloride comprises the following steps: a. the first aluminum-containing material reacts with the hydrochloric acid solution to obtain the reactionmother liquor; and b. the reaction mother liquor reacts with the second aluminum-containing material, then curing and depositing, the upper layer clear liquid is taken out, namely the polyaluminium chloride solution. The first aluminum-containing material and the second aluminum-containing material comprises the aluminum-containing sludge, the acidity of the reaction mother liquor in the step a is 9% to 12%, the content of Al2O3 is more than or equal to 8.0%, in the step b, the reaction mother liquor and the aluminum-containing material react under the condition of 110 to 120 DEG C and 0.2 to0.4MPa. The invention completely utilizes the industrial waste, and saves a mass of mineral resources and industrial hydrochloric acid, the production process focuses on the recycling utilization ofthe industrial waste, which is very beneficial to the environment and resource protection, and simultaneously the production costs of the PAC product are significantly reduced.

Description

Production method of polyaluminum chloride technical field The invention relates to a production method of polyaluminum chloride, which belongs to the field of water treatment additives. Background technique Polyaluminum chloride (hereinafter referred to as PAC) is a commonly used high-efficiency water treatment additive, and aluminum-containing raw materials such as calcium aluminate powder or bauxite are important raw materials for its production. The production of PAC not only needs to consume a large amount of mineral resources, but also requires HCl as a raw material, which has a very adverse impact on the environment and resources. With the development of the economy, more and more waste water is produced. At the same time, people pay more and more attention to the environment, and the requirements for waste water treatment are getting higher and higher. The amount of PAC used as an efficient water treatment additive is also increasing. The current PAC production p...

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Problems solved by technology

The current PAC production process is very unfavorable to the environment and resource protection

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