摘要 |
FIELD: chemical industry. SUBSTANCE: to part of alkaline metal silicate (concentration of SiO<SB>2</SB> is less 20 g/l) an acidifying agent - H<SB>2</SB>SO<SB>4</SB> and sodium aluminate (pH 6-7) are added at mass ratio Al/SiO<SB>2</SB> = 1 000:3 300 ppm. Then remained alkaline metal silicate and an acidifying agent are added. Mass ratio of added SiO<SB>2</SB> to SiO<SB>2</SB> in reaction mixture = 10:100. By other variant to alkaline metal silicate before acidification electrolyte is added, precipitated mass is separated, disagglomerated by dilution with water, wet grinding or treatment by ultrasonic oscillation at simultaneous acidification to pH below 4 followed by washing out with an organic solvent, for example, ethanol, ether or their mixture and drying. The content of dry matter in obtained suspension is 10-40 wt.-%, viscosity is 4 x 10 Pa x s, not above, at tangential tension 50 s , content of SiO<SB>2</SB> in floated precipitate after centrifugation for 30 min at 7500 rev/min - above 50 wt.-% of the content of SiO<SB>2</SB> in suspension. Mean diameter of agglomerates D<SB>50</SB> - less 5 mcm, agglomeration coefficient Fd - above 3 ml. Invention can be used for making anticorrosive coatings, concrete, paper, mineral glue. EFFECT: improved methods of producing. 21 cl, 4 ex
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