Inorganic oxidability high molecular ferro-silicon coagulant, preparation process thereof and applications

Abstract

The present invention provides an inorganic oxidizing macromolecular silicon iron coagulating agent, a preparation technique thereof and the application to water treatment. The coagulating agent is yellowish green or yellowish brown liquid or solid product, has low cost, good stability and oxidizing property and increases composite function and improves efficiency for eliminating turbidity, color, heavy metals, algae, organic matter, etc. The UV254 removal rate of the water of the Yellow River can reach 55%-80%, and the COD Mn removal rate can reach 75%-95%. For slaughtering wastewater, COD can drop below 100mg / L, and chroma is lowered below 5 and phosphorus removal rate can reach 80%-98%. The preparation method of the coagulating agent adopts an oxidation and copolymerization method, has simple technique and equipment, short period and no secondary pollution and can be carried out at normal pressure and low temperature. The inorganic oxidizing macromolecular silicon iron coagulating agent of the present invention is suitable for the treatment fields of municipal water supply and sewage as well as industrial water supply and wastewater and is especially suitable for low-temperature and low-turbidity water, the water of a micro-polluted water source or the industrial wastewater having high chroma and high organic content or containing refractory organic substances.

Description

technical field [0001] The invention relates to an inorganic oxidizing polymer ferrosilicon coagulant, its preparation process and its application as a coagulant in water treatment. Background technique [0002] Aluminum salts and iron salts are special inorganic coagulants in the field of water treatment. The residual aluminum in aluminum salt treatment water has cumulative biological toxicity, and its sludge cannot be reused and it is difficult to treat harmlessly. Therefore, non-toxic iron coagulants have been widely used and developed rapidly in the field of water treatment at home and abroad. It goes through three stages: traditional iron salt, inorganic polymer iron salt, and inorganic composite polymer iron salt. Inorganic polymer ferrosilicon coagulant is the latest variety among iron salts, which is a complex of silicon and iron. It was developed in Japan in the early 1990s, but it was reported in the form of patents. The coagulant has a good water purification eff...

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Problems solved by technology

[0003] Although a lot of research has been done on the preparation, performance, influencing factors and morphology of polymer ferrosilicon coagulants, the product stability is still poor, and there has been no breakthrough in the improvement of comprehensive decontamination performance.

In order to improve the multifunctionality of ferrosilicate coagulant, domestic CN1210818 (State Intellectual Property Office of the People's Republic of China) prepares oxidized polysilicate iron by adding an oxidizing agent (such as potassium permanganate or hydrogen peroxide, etc.). Addition makes the cost of the coagulant higher, resulting in a certain degree of difficulty in industrialization

These defects have led to the fact that inorganic polymer ferrosilicon coagulants and their oxidation modifiers have not yet formed a certain market size.

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