A kind of polymerized bis-acid aluminum iron filter residue reuse process

Abstract

The invention discloses a recycling process of polymeric aluminum ferric chlorine sulfate filter residue; the process is as follows: adding water, hydrochloric acid and sulfuric acid into a first reaction kettle, adding the filter residue, stirring until the filter residue is completely dissolved; adding iron-containing trihydrate bauxite powder for reacting at 93 to 115 DEG C for 2-5h; controlling the basicity of the material liquid after the reaction to be 19% + / -7% by adjustment of weight parts of hydrochloric acid, sulfuric acid and the filter residue; separating the residue from the material liquid after the reaction, taking mother liquor, adding a proper amount of water, adding calcium aluminate powder; adjusting the material liquid density to be greater than or equal to 1.20g / ml, adding a synergist solution, reacting at 85-125 DEG C under normal pressure for 3-5h to obtain liquid polymeric aluminum ferric chlorine sulfate; collecting and recycling the produced filter residue for reusing in production system to continue participating into the reaction. The recycling process achieves reuse of the filter residue in the polymeric aluminum ferric chlorine sulfate production without addition of process equipment and other materials, greatly reduces the polymeric aluminum ferric chlorine sulfate production cost, reduces filter residue emissions, and is circular and economic.

Description

technical field

[0001] The invention relates to a process for reusing filter residue of polymerized bis-acid aluminum iron. Background technique

[0002] Polymerized aluminum iron bis-acid is a new type of high-efficiency water purifier, which integrates the advantages of aluminum salt and iron salt-based high-efficiency water purifiers. agent. However, in the process of using iron-containing bauxite powder as the main raw material to produce polyaluminum ferric acid, filter residues accounting for about 6-9% of the total output will be produced. If the annual output of 10,000 tons of liquid polyaluminum iron According to the production enterprise of the product, it is necessary to produce 600-900 tons of filter residue a year. After testing, the incompletely dissolved effective iron oxide component of the filter residue accounts for 15-20% of the total filter residue, and the incompletely dissolved effective alumina component accounts for 20-30% of the total filter residu...

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