Compound diatomite flocculating agent and preparation method thereof

Abstract

The invention relates to a compound diatomite flocculating agent and a preparation method thereof. The compound diatomite flocculating agent is prepared from the following raw materials in parts by weight: 9 parts of iron concentrate, 6 parts of 90% of concentrated sulfuric acid and 35 parts of diatomite with water content of 50%. The preparation method comprises the following steps: fully mixing the iron concentrate and the concentrated sulfuric acid according to the percentages, and completely stirring at room temperature for 1hr so that the materials are fully reacted; adding the reacted materials and diatomite to a kneading machine at the weight ratio of 3 to 7, and stirring for 1hr so that the diatomite is fully mixed and reacted with the mixture of iron concentrate and sulfuric acid and the materials are activated; gradually heating the activated product in a dryer to about 500 DEG C, drying and heating for 10min so that the water content of the material is reduced to be less than 30%, stopping heating and gradually cooling to normal temperature; adding the cooled material to a winnowing device, processing the material sequentially by virtue of a windmill classifier, a cyclone separator and a pulse dust collector and grinding the to qualified grain size which is less than 100 meshes; and packaging the material. The flocculating agent disclosed by the invention is strong in hydrophilcity, and is rapid in dehydration and settlement of a flocculate.

Description

technical field [0001] The present invention relates to a flocculant for water and waste water treatment, specifically a new type of composite diatomite flocculant (FGX) which takes diatomite as the main material and compound a certain amount of compound iron polymer and its preparation method. Background technique [0002] Aluminum flocculants are the most common flocculants used in water and wastewater treatment. The development of polyaluminum and polyaluminum silicate flocculants has further developed the application of aluminum salt flocculants. So far, aluminum salt flocculants are commonly used in the tap water industry. The aluminum content of drinking water produced by existing domestic production methods is generally 1-2 times higher than that of raw water, which may cause certain adverse effects on the human body. The phenomenon of acid rain in southern my country is relatively prominent. Acid rain can transform aluminum in industrial aluminum-containing sludge a...

AI Technical Summary

Problems solved by technology

Other studies have shown that the toxicity of aluminum can kill fish in large numbers when the pH of the water body is lowered enough to kill the fish

[0004] (2) Toxic effect of aluminum salt flocculants on plants: the use of aluminum-containing wastewater to irrigate farmland and the fertilization of aluminum-containing agricultural fertilizers improved with sewage sludge lead to an increase in aluminum content in the soil

[0005] (3) Toxic effect of aluminum salt flocculant on human body: With the aluminum pollution of environmental soil, urban water supply is treated with aluminum salt coagulation, resulting in excessive aluminum in human body

[0006] (4) At present, polyaluminum chloride is mostly used as a flocculant on the market, and its active ingredient is AlCl 3 , if the treated sewage is discharged directly, the residual Al in the water will 3+ Harm to the environment again