Colloid silica in hydrothermal heat carrier: characteristics, technology of extraction, industrial applications

2nd International Geothermal Conference, GEOHEAT2018

Potapov, V.^1 ; Serdan, A.^2 ; Gorev, D.^1 ; Zubaha, S.^1 ; Shunina, E.^1

Research Geotechnological Center, Far East Division, Russian Academy of Sciences, Severo-Vostochnoe shosse, 30, Petropavlovsk-Kamchatsky-City

683002, Russia^1

Lomonosov Moscow State University, Chemistry Department, Lenin Hills,1, Moscow

119991, Russia^2

关键词: Hydrothermal solution;    In-buildings;    Nano-silica;    Particles aggregations;    scales;    Silica purification;    Ultra-filtration membranes;    Vacuum sublimation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/249/1/012043/pdf
DOI  :  10.1088/1755-1315/249/1/012043

来源: IOP

【 摘 要 】

Hydrothermal solution as one of new mineral source for silica production. We have developed methods for silica extraction from hydrothermal solution. Ultrafiltration membrane concentration was used to obtain silica sols. Ultrafiltration membranes have selectivity on colloid silica particles about 1.0 and low selectivity on silicic acid molecules and ions. Thus, ultrafiltration provides with a low content of impurities and stability of water sols up to the highest SiO2 content (up to 62.5 %). Cryochemical vaccum sublimation of silica sols was used for production nanopowders with specific surface of particles up to 500 m2/g. Cryochemical vacuum sublimation of sols gave the possibility to reduce particles aggregation when silica was extracted from liquid phase. By extraction of silica purification of heat carrier can be achived and the problem of solid scales formation in heat equipment of GeoPPs can be decided. Perspective ways of industrial applications for sols and nanopowders obtained from hydrothermal heat carrier such as building industry and agriculture were dicussed.