Polymeric aluminum ferric chloride sulfate flocculating agent and preparation method thereof

Abstract

The invention discloses a polymeric aluminum ferric chloride sulfate flocculating agent and a preparation method thereof. The preparation method of the polymeric aluminum ferric chloride sulfate flocculating agent comprises the steps that hydrochloric acid and titanium dioxide industrial by-products are mixed and heated to 40-50 DEG C for modification reaction; then red mud ferric extraction slagsand modified titanium dioxide industrial by-products are placed into an ultrasonic reactor, mixed and heated to 100-110 DEG C to react so as to obtain a mixed liquid; the mixed liquid is cooled and filtered, an oxidizing agent is added into obtained filter liquor for polymerization reaction. The red mud ferric extraction slags and the titanium dioxide industrial by-products serve as main raw materials for preparing the polymeric aluminum ferric chloride sulfate flocculating agent, the polymeric aluminum ferric chloride sulfate flocculating agent can be prepared in one step by introducing a small quantity of ferrous ions in a ferric ion system without reducing original ferric ions, the flocculation effect is good, the removal rate for TP, COD and chromaticity is high.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a polymerized ferric aluminum sulfate chloride flocculant and a preparation method thereof. Background technique [0002] At present, the commonly used inorganic coagulants for water treatment on the market mainly include two types of agents, namely iron salts and aluminum salts. Iron salt has the advantages of fast hydrolysis, large volume of alum flowers, compactness, fast sedimentation, and high strength, but there are also defects such as large residual chroma in the effluent. The aluminum salt has the advantage of small residual chroma in the effluent, but at the same time has defects such as slow hydrolysis, small volume of alum flowers, and slow sedimentation. [0003] Polymerized ferric aluminum sulfate chloride is developed on the basis of polyferric sulfate. It has both the excellent water purification effect of aluminum salts and the advantages of fast sedimen...

AI Technical Summary

Problems solved by technology

The by-product sulfuric acid contains 15-25% sulfuric acid and 10-15% ferrous sulfate, and also contains Al 2 (SO4) 3 and MgSO4 and other inorganic salts and metatitanic acid, the treatment process is complex and difficult

Moreover, the by-product sulfuric acid contains a variety of impurities and cannot be directly reused or discharged at will. Therefore, the comprehensive utilization and environmental pollution of the by-product sulfuric acid in the titanium dioxide industry are also problems that need to be solved urgently in the current technical field

[0007] However, the red mud iron extraction slag produced by the aluminum industry after iron extraction has no industrial value. At present, most of them are stored in dry or wet stacks, and the dust formed by the sun-dried red mud iron extraction slag is everywhere. Flying, destroying the ecological environment, and polluting groundwater

[0008] So far, there is no report on the preparation of polyferric aluminum sulfate chloride by using red mud iron extraction slag and titanium dioxide industrial by-products

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