METHOD OF PURIFYING NON-MODIFIED MONTMORILLONITE-BASED BENTONITE Russian patent published in 2014 - IPC C01B33/44 C09C3/00 C08K3/34 C08K9/04 B82B3/00 

FIELD: chemistry.

SUBSTANCE: method of purifying non-modified montmorillonite-based bentonite includes primary preparation of raw material, which includes sieving bentonite powder obtained from a open pit, primarily consisting of montmorillonite, from coarse mechanical inclusions, dispersing the bentonite powder in an aqueous medium using a high-speed colloidal mill, further chemical treatment in containers with overhead mixers, treatment in a system of hydrocyclone apparatus and vibratory sieves, treatment in a high-speed drum-type centrifuge, treatment in drying modules and grinding the finished product - non-modified pure montmorillonite-based bentonite or treatment in drying modules and grinding the finished product with preliminary further chemical treatment of pure bentonite in a Z-shaped mixer equipped with an evacuation module. Treatment of the bentonite powder is carried via cation-exchange reactions using phosphates, e.g. sodium phosphate and sodium polyphosphates such as sodium tripolyphosphate, which is a trimer of an orthophosphoric acid salt Na₅P₃O₁₀.

EFFECT: method enables to obtain bentonite of high degree of purity from different types of impurities.

3 cl, 3 tbl