Abstract

Ulzhalgas Nazarbek¹, Uilesbek Besterekov¹, Saule Nazarbekova², Aidar Bolysbek¹ and Galya Kambarova¹

DOI : http://dx.doi.org/10.13005/ojc/330311

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 superphosphate, we have applied a double superphosphate 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 Са(Н₂РО₄)₂, an insignificant quantity of СаНРО₄, 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 ΔG0 values of sulfuric and phosphoric acids decomposition of phosphorus slime at the temperature of 600°C were compared.

Phosphoric slime; sulphuric and phosphoric acids; processing; superphosphate; thermodynamic analysis

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