Press-granulating process of non-ductile salts

摘要

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.

主权项

1. Process for press-granulating of non-ductile salts and salt mixtures, such as kieserite, langbeinite, polyhalide, anhydride and arcanite, by roller pressing at pressures of up to 280 bar, wherein a viscous additive in form of sugar-containing by-products of the sugar cane or sugar beet process is added in an amount of 1.5 to 8% by mass to a powder-like salt or salt mixture to be granulated in one or a plural of mixers in series, and compacting the homogenized mixture in a press granulating process using roller presses.