Physicochemical products for industrial purposes, namely, magnesium chloride, calcium chloride, magnesium hydroxide and magnesium oxide for use as a raw material and as auxiliaries in the manufacture of fodder, drill suspensions, textiles, sugar, antifreeze, brine, absorbing and dust laying compositions, chemicals, artificial fertilizers, cements, cleansing preparations, paper, grindstones, leather treatment preparations and tanning substances, welding electrodes and refractories, and for use in the purification of water and flue gases; Raw materials for making refractories for the metal industry