METHOD OF OBTAINING MAGNESIUM OXIDE FROM WASTE OF SERPENTINE ORE Russian patent published in 2018 - IPC C22B26/22 C22B3/06 

FIELD: technological processes.

SUBSTANCE: invention relates to a process for the production of magnesium oxide from magnesium-containing mineral raw materials. Method for producing magnesium oxide from the serpentinite ore waste includes the preparation of serpentinite ore waste, wet magnetic separation to separate the magnesium-containing suspension from magnetite, leaching with mineral acid, carbonization and annealing. Preparation of wastes of serpentinite ore is carried out by thermal activation in the furnace at a temperature of 500–600 °C and grinding the thermally activated serpentinite to a particle size of less than 0.1 mm. Leaching is carried out using flue gas, which, when an activated serpentinite passes through an aqueous suspension, forms carbonic acid HCO₃ with pH index of 3.5–4.5.

EFFECT: increasing the speed of the process and the degree of recovery due to the greater availability of the inclusions of the dissolved mineral blocked by barren rock; invention provides an environmentally safe production of magnesium oxide from the dumps in a more efficient manner.

1 cl, 1 dwg