METHOD OF OBTAINING POTASSIUM ALUM Russian patent published in 2015 - IPC C01F7/76 C01B33/12 C22B3/08 C01F17/00 

FIELD: chemistry.

SUBSTANCE: in order to obtain potassium alum prepared is raw material represented by remnants of domanic formations, which contain aluminium, silicon dioxide, organic substance and include rare and rare earth elements. Leaching of acid-soluble components of raw material is carried out in autoclave with solution of sulphuric acid to its residual concentration 45-75 g/l. Obtained suspension is separated into liquid phase, which contains aluminium, potassium, sodium, rare metals, and solid phase, which contains silicon dioxide and organic substance. Potassium sulphate is added into hot liquid phase, obtained solution is cooled and crystallisation of potassium alum is carried out. Potassium sulphate is added from estimation of binding 80-90% of free aluminium sulphate in potassium alum with holding in solution of rare and rare-earth elements.

EFFECT: invention makes it possible to increase output of alumopotassium alum with simultaneous complex extraction of rare and rare earth elements and obtaining carbon-silica product.

3 cl, 2 ex