Press-granulating process of non-ductile salts
AssigneeK-Utec AG Salt Technologies
InventorsStephan Kaps, Heinz Scherzberg, Barbara Heuchel
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Abstract
Process of press-granulating non-ductile salts and salt mixtures, such as kieserite (MgSO4·H2O), langbeinite (K2SO4·2MgSO4), polyhalide (K2SO4·MgSO4·2CaSO4·2H2O), arcanite (K2SO4) and anhydrite (CaSO4) for preparing stable, storable granulate, by pressing a mixture of fine grains of salt and a viscous, sugar-containing additive, such as molasses having a total sugar content in the dry matter of from 47 to 55%, by roller pressing at pressures up to 260 bar. The press scraps initially obtained, which are ductile, are solidified by maturing of the material at temperatures between 20 and 40° C. and maturing times of 3 to 8 hours prior to crushing them in impact mills and sieving.
Claims8
A process for press-granulating of non-ductile salts and salt mixtures comprising adding a viscous additive in form of sugar-containing by-products of a sugar cane or sugar beet process in an amount of 1.5 to 8% by mass to a powder-like salt or salt mixture at pressures of up to 280 bar, mixing the powder-like salt or salt mixture with the viscous additive added thereto in one or a plural of mixers in series to form a homogenized mixture, and compacting the homogenized mixture in a press granulating process using at least one roller press.
Dependencies are inferred from the claim text.