METHOD OF PREPARING POTASSIUM SULFATE Russian patent published in 1997 - IPC

Abstract RU 2092436 C1

FIELD: preparation of potassium sulfate from potassium containing waste. SUBSTANCE: claimed method comprises preparing potassium sulfate by leaching potassium from cement production dust at liquid to solid phase ratio of 3-4 at 85-100 C for 40-60 min with mixture of mother liquid and some wash water in 1:0.8 ratio by volume. Suspension is then separated into alkali solution and slurry which is washed with water, and solution is neutralized with oil of vitriol to attain pH of 7-9, evaporated to density of 1.145-1.555 and cooling of lye to 15-25 C produces potassium sulfate crystals. K₂O content in the resulting products is 49.0-50.5 % and SO-24

content is about 59 %. This signifies first grade product. The product thus obtained is useful as fertilizer, and in glass making and other industries. EFFECT: more efficient preparation method. 3 dwg, 3 tbl

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RU 2 092 436 C1

Authors

Filippov A.P.

Viljanskij M.P.

Litvin A.Ja.

Chikin M.M.

Gibelev E.I.

Ponomarev L.I.

Dates

1997-10-10—Published

1995-09-06—Filed