MAGNESIUM EXTRACTION METHOD FROM NATURAL SILICON-CONTAINING MATERIALS Russian patent published in 2008 - IPC C22B26/22 C22B3/10 

FIELD: processes for extracting magnesium from natural silicon -containing materials and waste material such as serpentinite.

SUBSTANCE: method comprises steps of disintegrating initial solid material; leaching it and washing leached residue. Disintegration is performed till fraction size 0.4 + 0.1 mm. Leaching of disintegrated material and washing of leached deposit are realized by countercurrent in uprising vertical flows of hydrochloric acid solution and water at heating and applying reciprocation type oscillations with intensity 800 - 1000 mm/min. Transportation of leached deposit to washing operation is realized by means of hydraulic transport with use of water. At unloading leached deposit from vertical flow, volume of water equal to volume of unloaded deposit is guided for mixing with initial water used for hydraulic transport.

EFFECT: improved efficiency of magnesium extraction, possibility for lowering dilution degree of chlorine-magnesium solution, reduced cost of concentration by evaporation and of decreased loss of valuable components at washing.

4 cl, 1 dwg, 2 tbl, 1 ex