METHOD OF PRODUCING SORBENT BASED ON DOLOMITE Russian patent published in 2020 - IPC B01J20/30 B01J20/02 B01J20/04 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of producing sorbents based on natural mineral raw materials. Dolomite is subjected to thermal treatment at 800–850 °C, after which is milled to particle size of not more than 50 mcm. Phosphorus-containing reagent is prepared by mixing heated to 30–70 °C of phosphoric acid, titanium salt in form of ammonium titanyl sulphate (NH₄)₂TiO(SO₄)₂⋅H₂O or titanyl sulphate monohydrate TiOSO₄⋅H₂O and ammonium phosphate in form of ammonium dihydrophosphate NH₄H₂PO₄ to provide molar ratio Ti:P=1:2.0–2.5 and pH 2–3. Dolomite is decomposed with a phosphorus-containing reagent to form a suspension. Suspension is filtered to separate solid phase, which is washed with water and dried to obtain sorbent of polyphase composition.

EFFECT: invention increases sorption capacity of cesium up to 100 mg/g, strontium and cobalt to 90 mg/g in a wide range of operation of the sorbent in solutions with pH 3–9.

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