METHOD OF RECEIVING OF ALUMINIUM SULFATE Russian patent published in 2009 - IPC C01F7/74 

FIELD: metallurgy.

SUBSTANCE: invention relates to hydrometallurgy field, particularly to methods of processing of high-silicon aluminium raw materials with receiving of aluminium sulfate. Method includes treatment of aluminium-bearing raw materials - kaolin 95% sulfuric acid and thermal processing of the received reactionary mass. It is used kaolin with mass concentration of alumina, equal to 20-27%, which before blending with sulfuric acid is moistened. Thermal processing of reactionary mass is implemented at 320-350°C during 3 hours, after it sulfate product is leached by water at ratio S:L, equal to 1:3, and temperature 80-90°C up to finite size pH, equal to 3.5-4.0. Received pulp is filtered, filtrate evaporated up to density 1.45 g/cm³ and aluminium sulfate is crystallised.

EFFECT: invention provides increasing of extraction ratio of aluminium oxide into solution.

3 cl, 3 ex