Oxidation polysilacidiron coagulant and preparation thereof

Abstract

An oxidized polysilicate iron coagulating agent and its production are disclosed. The process is carried out by mixing activating silicic acid with low-polymerization degree with acid ferrous sulfate solution, adding into oxidant, additive and stabilizer, aging to obtain liquefied product or curing to obtain product. Its advantages include short period, better stability, simple process and good coagulating effect.

Description

technical field [0001] The invention belongs to the field of water treatment and relates to a composite functional inorganic polymer coagulant and relates to an oxidized polysilicate iron coagulant and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of industry, agriculture and cities, endogenous pollutants and exogenous pollutants interact, and the range of man-made pollution sources continues to expand and aggravate. A lot of attention has been paid to treatment experts, and a lot of research has been done on the control and removal of organic matter in water. Many methods for removing organic matter have been explored. Pre-oxidation and advanced treatment are the most researched methods, but the operating costs are high and the facilities are complicated. Therefore, in the original Strengthening the conventional coagulation effect in water treatment technology is a realistic trend for developing countries, and the de...

AI Technical Summary

Problems solved by technology

The development of polysilicate iron began in the early 1990s. It has the advantages of fast coagulation and precipitation, less sludge, wide pH range, safety and non-toxicity, etc., but it is still slightly insufficient in the removal of organic matter. In order to improve The composite function of coagulant in water treatment, at the beginning of this century, some experts began to study the multifunctional coagulant with enhanced coagulation effect, but there were very few involved, and there were still some defects in its preparation process, domestic CN1210818 (State Intellectual Property Office of the People's Republic of China) take liquid iron trichloride, sodium bicarbonate and industrial water glass as raw materials, take oligomeric silicic acid as stabilizer, adopt homopolymerization composite method to prepare polymeric iron polysilicic acid flocculant, and It is to apply the same preparation method to prepare coagulants with different molar ratios of ferrosilicon to adapt to raw water and wastewater of different water quality

Domestic CN 1389407 (State Intellectual Property Office of the People's Republic of China) uses nitric acid to oxidize ferrous sulfate and uses sodium silicate as raw material to produce solid polymeric ferric silicate sulfate. The reaction is heated with steam, the temperature is controlled at 80°C-90°C, and tail gas is used to The absorption system treats the waste gas produced by secondary pollution, the investment in raw materials and equipment increases, the production process is complicated and causes secondary pollution

Both products are single polysilicate ferric coagulants without enhanced oxidation