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The given article contains the research results connected with the development of a technology of acid decomposition of phosphorus slime. As opposed to a known technology of manufacturing super phosphate, we have applied a double super phosphate production technology as a basis. Slime raw material is fed to both stages of acid decomposition; the first stage is sulphuric acid decomposition, and the second stage – phosphoric acid one. The basic chemistry of two step processing of phosphorus slime is described. Thermodynamic analyzes of the described reactions are given. According to the thermodynamic analysis the Law’s of phosphorus slime decomposition were found. As a result the end product after phosphoric-acid decomposition contains basically Ca(H2PO4)2, an insignificant quantity of CaHPO4, water-soluble magnesium and potassium phosphates and also the insoluble residue (SiO2). According to the thermodynamic analysis, the decomposition regularities of phosphorus slime were revealed. The ∆G0 values of sulfuric and phosphoric acids decomposition of phosphorus slime at the temperature of 600 ° C were compared. keywords: phosphoric slime, sulphuric and phosphoric acids, processing, super phosphate, thermodynamic analysis

Technology Basis and Thermodynamic Analysis of an Acid Decomposition Process of Phosphorus Slime