Screening and processing potash
Achieving the right and consistent grain size - lasting and economical
Commonly potash or potassium salt is defined as a mixture of various salt minerals containing a high percentage of potassium of which only potassium chloride and magnesium chloride are used for industrial purposes.
Potash consists of halite (NaCl), sylvine (KCl), carnallite and kieserite. Potassium salt is coloured orange-red to light brown which arises from the content of iron oxide. Depending on the main component it is differentiated between kieserite, sylvine or carnallite potassium salt. Most of the deposits consist of sylvne or carnallite potassium salt.
The mined raw salt only contains about 20 to 35% of usable raw material – salt preparation in above ground plants is necessary to produce marketable quality. Preparation processes are flotation, hot wet extraction and electrostatic separation (ESTA). Depending on the various preparation steps different screen cuts and screening technologies are required. In the flotation normally wet screening machines are used. In dry screening the electrostatic separation requires very fine screen cuts.
Common marketable products, usually granulated, are potash with a purity of 93% and potassium salt with a potassium chloride content of 99%.
Find information about the screening of potash fertilizer here.