Process for preparing poly-ferric sulfate chloride by oxidation of oxyful

Abstract

The invention discloses a process for preparing poly-ferric sulfate chloride by oxidation of oxyful, which comprises the following steps: iron sulfate heptahydrate is stirred and added into a reaction tank, and industry by-product hydrochloric acid is added into the reaction tank; oxyful containing 30-35 percent of hydrogen peroxide (H2O2) is slowly and uniformly added into the reaction tank; 5 percent of natrium hydroxide (NaOH) solution is slowly and uniformly added into the reaction tank, and a poly-ferric sulfate chloride product which has 8-14 percent of degree of basification is produced; the poly-ferric sulfate chloride product in the reaction tank is put into a curing tank to be cured for 10 days, and the chemical index of the poly-ferric sulfate chloride product is adjusted to a required value. The invention has the advantages of environmentally-friendly and wide raw material source, small investment, quick return, chemical industry environmental protection and zero discharge of industrial waste. In addition, the invention adopts the oxyful for oxidation and is easy and convenient to operate and control.

Description

technical field [0001] The invention relates to a process for preparing polyferric chloride sulfate, in particular to a process for preparing polychlorinated ferric sulfate by oxidation with hydrogen peroxide. Background technique [0002] At present, in the sewage treatment industry of the prior art, a large amount of inorganic flocculants are needed, that is, the inorganic flocculants are used to coagulate the sludge in the sewage to settle the sludge and realize the purification of the sewage. The above-mentioned inorganic flocculants include: aluminum salt flocculant and iron salt flocculant, aluminum salt flocculant and iron salt flocculant have the following defects in the process of sewage treatment: aluminum salt remains in water after treatment with aluminum salt flocculant, which is harmful to the human body The serious harm of aluminum and the biological toxicity of aluminum; the coagulation effect of flocculant with iron salt (polyferric sulfate, ferric chloride)...

AI Technical Summary

Problems solved by technology

The above-mentioned inorganic flocculants include: aluminum salt flocculant and iron salt flocculant, aluminum salt flocculant and iron salt flocculant have the following defects in the process of sewage treatment: the water after treatment with aluminum salt flocculant has residual aluminum, which brings harm to the human body The serious harm of aluminum and the biological toxicity of aluminum; the coagulation effect of flocculant with iron salt (polyferric sulfate, ferric chloride) is poor, and the product performance is not good

The disadvantages of using the catalytic oxygen oxidation method are: 1) large investment, larger reaction equipment is required for the same production capacity level, that is, heating equipment with a reaction temperature of 90±5°C is required, and positive pressure operation has high requirements for the reaction tank; 2 ) It is necessary to add a catalyst to the system, sodium nitrite is a poisonous and carcinogenic salt; 3) The reaction time is long

The shortcoming that adopts sodium chlorate oxidation method to exist is: 1) sodium chlorate is a kind of inorganic salt, and the sodium chloride that produces after the oxidation reaction and remaining sodium chlorate will stay in the product system, and product has irritating smell Taste, affect product quality

2) During the reaction process, an extremely unbearable irritating odor is produced, polluting the environment and harming human health