Composite ferro-aluminum flocculant and preparation method thereof

Abstract

The invention provides a composite ferro-aluminum flocculant and a preparation method thereof. The composite ferro-aluminum flocculant is prepared as follows: a polymerized sodium silicate solution and a dicyandiamide, quaternary ammonium salt and iron salt mixed solution in a volume ratio being 1:(0.2-0.6) are mixed, and then an aluminum salt solution is added to the mixed solution. The composite ferro-aluminum flocculant has the advantages of good stability, remarkable flocculation and decolorization effects, high sedimentation rate and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage and wastewater treatment, and specifically relates to an organic-inorganic composite aluminum-iron-based high-efficiency flocculant and a preparation method thereof. Background technique [0002] With the rapid improvement of my country's industrialization of production and living standards, the annual discharge of production wastewater and domestic sewage is also increasing rapidly in series. Efficient and safe treatment of these wastewater and sewage is a challenge for the coordinated development of environmental protection and resource utilization. It is also one of the difficulties that many chemical companies urgently need to get rid of. [0003] The use of flocculants for chemical flocculation and sedimentation is one of the effective means to treat wastewater and sewage, and it is also a hot and difficult point in the field of sewage treatment. Flocculants are generally divided into two cate...

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Problems solved by technology

Among the inorganic flocculants, aluminum salts such as aluminum sulfate and iron sulfate and iron salts are the most traditional type of flocculants, which have strong adsorption capacity and low cost, but are easy to introduce other ions such as ferrous iron, and are highly turbid. The treatment capacity of high-degree sewage is limited, which is far from meeting the needs of existing wastewater treatment; organosilicates are a type of inorganic flocculants with a high degree of polymerization developed on this basis, although compared with traditional Inorganic flocculants have higher flocculation and sedimentation ability, but their silica network structure is easily damaged by acid centers, which has higher requirements on the acidity and alkalinity of the treated wastewater, which limits its application.

Among organic flocculants, polyacrylamide is a commonly used non-ionic organic flocculant, in addition to cationic organic flocculants such as amino resins and anionic organic flocculants such as sodium polyacrylate, these organic flocculants It can form larger flocculent sediments with strong adsorption capacity, but the settling rate is slow and the cost is high

In order to make better use of the respective advantages of organic and inorganic flocculants, organic-inorganic composite flocculants have also been developed in the prior art. Generally, iron salts or aluminum salts are combined with organic polymers or modified starches. Or complexed, with high safety and flocculation effect, but this kind of flocculants often have poor stability, and the performance in decolorization is general

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