Prepn process of high concentration polymerized aluminium sulfate flocculant

Abstract

The present invention discloses preparation process of high concentration polymerized aluminum sulfate flocculant. The preparation process includes two steps of preparing high concentration stable sodium metaaluminate solution and polymerization reaction. During the preparation of high concentration stable sodium metaaluminate solution, sodium gluconate is added into sodium hydroxide solution at 100-120 deg.c, aluminum hydroxide, stabilizer and initiator ammonium persulfate are also added. The polymerization reaction includes dissolving sodium carbonate in small amount of water, adding sodium silicate solution and sodium metaaluminate solution to obtain alkali intermediate product, high speed dispersing aluminum sulfate solution in a water bath and adding the alkali intermediate product slowly, mixing, stirring at 55-60 deg.c to mature and obtain high concentration polymerized aluminum sulfate flocculant. The flocculant has high stability, alumina content of 8.21-10.84 % and basicity of 65.90-72.93 %.

Description

Technical field

[0001] The invention relates to a flocculant, in particular to a preparation method of a high-concentration polyaluminum sulfate flocculant. The flocculant is especially suitable for processing low-temperature and low-turbidity raw water supply. Background technique

[0002] The polyaluminum-silica flocculant is a new type of inorganic polymer composite flocculant made by introducing polysilicic acid into polyaluminum. It can be regarded as a modified variety of polyaluminum. This type of flocculant combines the advantages of polysilicic acid and polyaluminum, and not only has an electric neutralization effect, but also has an adsorption bridging effect, and its flocculation performance is better than using polysilicic acid and polyaluminum alone. This type of flocculant has the characteristics of fast settling speed, non-toxic and harmless products, and low residual aluminum content in the water after treatment. It has become a research hotspot in the flocculant ...