A NEW APPROACH TO PROCESSING POLYMINERAL POTASSIUM ORE FROM THE CARPATHIAN REGION
DOI:
https://doi.org/10.15421/jchemtech.v33i4.340735Keywords:
Carpathian potash raw materials, processing methods, langbeinite, kainite, polymineral ore, sulfate potash fertilizers, productionAbstract
Existing technologies for processing polymineral potash ores of the Carpathian region do not ensure the production of high-quality, highly concentrated fertilizers and are also characterized by a low degree of potassium extraction (less than 60 %). Shenitization of ore in dumps allows achieving a higher degree of conversion of sparingly soluble langbeinite and kieserite into readily soluble minerals but it is a long-term process. Therefore, it is proposed to convert sparingly soluble minerals into readily soluble ones from the residue after ore dissolution using reversible salt suspensions. Based on experimental studies, a new technology for the production of chlorine-free potash fertilizers has been developed which includes the conversion of pre-prepared ore with a reversible salt suspension. This technological method and grinding of the residue before conversion can increase the extraction of potassium into the product up to 82 %. The main products of the proposed technology are table salt, potash fertilizers, magnesium chloride (or bischofite). The residue, which contains insoluble components, in particular, polyhalite can be processed into a long-acting, chloride-free, granular potassium fertilizer with trace elements.
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