METHOD OF COMPLEX PROCESSING OF MAGNESIUM SILICATES Russian patent published in 2006 - IPC C25C3/04 C01F5/32 

FIELD: metallurgy; chemical engineering of inorganic agents; complex processing of magnesium silicate-serpentinite.

SUBSTANCE: proposed method consists in classification of ground serpentinite into fractions followed by magnetic separation of calcium-containing nonmagnetic minerals. Magnetic fraction of serpentinite is leached out by hydrochloric acid. Magnesium chloride solution thus obtained is separated from amorphous sediment of silicon dioxide, after which it is washed and dried. Magnesium chloride solution is cleaned from admixtures, thus obtaining iron-nickel concentrate. Cleaned magnesium chloride solution and ground waste potassium electrolyte are used for production of synthetic carnallite-KCl·MgCl₂·6H₂O which is dehydrated to content of water lesser than 0.2% and is fed for electrolysis. As a result, metallic magnesium, chlorine gas and waste potassium electrolyte are obtained. Electrolyte is returned to carnallite production stage. Chlorine gas is subjected to conversion into hydrogen chloride which is directed for dehydrating of carnallite. Hydrogen chloride is separated from dehydration gases obtaining hydrochloric acid which is used for leaching-out of serpentinite.

EFFECT: waste-free ecologically safe process.

23 cl, 1 dwg, 1 tbl, 1 ex