SOP is a premium two nutrient fertilizer (50% K2O and 18% S) with the highest total nutrient value (68%) and the lowest salt index (46.1) which lowers osmotic effect and thereby reduces the dehydration of plants, SOP (K2SO4) offers an advantage over MOP (KCl) currently used by farmers with special focus on Chloride sensitive crops, Dryland agriculture, Sulphur responsive crops, Drip irrigation and areas deficient in K & S, Low cost than the present import price to promote its use for better soil and crop management, Conversion of liquid effluent into value added products such as low sodium salt and magnesia, No floatation is used for NaCl separation and recycle system designed leaches away NaCl with simultaneous increase in potash recovery, The sea bittern and many of subsoil bitterns in the country are sulphate rich and hence the potash is recovered in form of SOP which is agronomically better fertilizer, The recovery/yield of potash is high because of integration and recycle of intermediate streams
, The unit operations used are simple and most of the operations are carried out at ambient temperature except drying and calcinations of magnesium hydroxide to form MgO
, The technology developed is environmentally benign.
Central Salt & Marine Chemicals Research Institute (CSMCRI)
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