| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention can be used in production of different types of paper, film-forming compositions on metal and ceramics, as binding material in production of thermal protective material, shell moulds for precision casting and in production of construction materials. A sodium silicate solution is subjected to ion-exchange conversion to polysilicic acid, stabilisation with sodium hydroxide solution, thermal treatment at temperature not above 130 C for 2-3 hours with intense stirring without changing volume of the solution. The thermally treated hydrosol of silicon oxide is passed through a pre-filtration unit with subsequent concentration of the solution through ultra-filtration using a membrane unit with tangential distribution of the flow of liquid. ^ EFFECT: invention allows for increasing concentration of hydrosol of silicon oxide, its degree of purity, reducing deposits on reactor walls, increasing efficiency of the process. ^ 1 tbl, 2 ex |
