Physicochemical products for industrial purposes, including magnesium chloride for use as a raw material or as auxiliaries in the manufacture of fodder, drill suspensions, textiles, sugar, antifreeze, brine, absorbing and dust laying compositions, chemicals, artificial fertilisers, 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.