COMPLEX FERTILIZERS BASED ON LOCAL RAW MATERIALS

Phosphorites of the Central Kyzyl Kum are characterized by a high degree of carbonate content, the concentration of CO2 in some formations reaches 27 % or more. To involve the Kyzylkum phosphorites in the production of concentrated phosphorus-containing fertilizers, ore dressing is required by reducing the proportion of calcite and sesquioxide compounds. One of the effective methods of enrichment of high-carbonate phosphorites can be selective removal of carbonates from the ore by using dilute acids or thermochemical removal of CO2 with subsequent leaching of free calcium oxide with water or solutions of nitrogen salts. It should be noted that the Kyzyl Kum phosphorites have a high degree of carbonate content, the concentration of CO2 in some samples reaches 27 % or more. Naturally, with such a high carbonate content in the feedstock, the best way to enrich it is thermal.

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