Council of Scientific and Industrial Research

Abdulhamid Usmanbhai Hamidani

Pushpito Kumar Ghosh

Maheshkumar Ramniklal Gandhi

Vadakke Puthoor Mohandas

Himanshu Labhshanker Joshi

Hasina Hajibhai Deraiya

Sohan Lal Daga

Kaushik Jethalal Langalia

Koushik Halder

Rajinder Nath Vohra

Rohit Harshadray Dave

Ramjibhai Devjibhai Rathod

Rahul Jasvantrai Sanghavi

Indrajit Mukhopadhyay

Venkata Rama Krishna Sarma Susarla

Puthoor Mohandas Vadakke

Ashokkumar Bhagvanjibhai Kasundra

Purashottambhai Ravajibhai Jadav

Venkata Rama Susarla

The process of the invention deals with significant improvements in salt purity and whiteness brought about through treatment of brine with alum prior to charging into crystallizers for solar salt production. The improvements realized are partly on account of elimination of suspended impurities like gypsum and clayey matter in the brine, which may otherwise be carried along with the brine in the crystallizer and finally end up in the salt, and partly due to the improved crystal size and morphology that minimizes embedded impurities in the salt. Rain washing of the heaped salt has resulted in a salt with greatly reduced calcium and sulphate impurity levels hitherto not achieved in solar salt production. Alum treatment by the process of the invention requires no additional time or infrastructure and the cost of the treatment works out to &#x3c;3 U.S. cents per ton of salt. The process can be implemented in any solar salt works.

Process for the preparation of solar salt having high purity and whiteness

The present invention is directed to a novel integrated process for the recovery of sulphate of potash (SOP) from sulphate rich bittern. The process requires bittern and lime as raw materials. Kainite type mixed salt is obtained by fractional crystallization of the bittern, and is converted to schoenite which is subsequently reacted with muriate of potash (MOP) for its conversion to SOP. End liquor from kainite to schoenite conversion (SEL) is desulphated and supplemented with MgClusing end bittern generated in the process of making carnallite. Decomposed carnallite liquor produced is reacted with hydrated lime for preparing CaClsolution and high purity Mg(OH)2 having low boron content. It is shown that the liquid streams containing potash are recycled in the process, and the recovery of potash in the form of SOP is quantitative.

Process for recovery of sulphate of potash

The present invention relates to recovery of industrial grade potassium chloride and low sodium edible salt from bittern as part of an integrated process. The process comprises, mixing low sulphate concentrated feed bittern (a by-product of salt industry) of density 31.5 to 32.5&#xb0; Be (sp.gr. 1.277&#x2013;1.289) with high density end bittern of density 36.5 to 37.5&#xb0; Be' (sp.gr. 1.336&#x2013;1.35), thereby producing low sodium carnallite, from which industrial grade potassium chloride is produced. The resultant bittern is evaporated in forced evaporation system, thereby producing crude carnallite, from which low sodium salt that would be beneficial to persons suffering from hypertension is produced. When sulphate-rich bittern is used, such bittern is desulphated with CaClthat is generated from carnallite decomposed liquor through reaction with lime, and wherein low BO-containing Mg(OH)is a by-product. The entire content of potassium in feed bittern is recovered in the process of the invention.

Simultaneous recovery of potassium chloride and KCL enriched edible salt

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Bhavnagar, India

Abdulhamid Usmanbhai Hamidani