Investigation of Technological Parameters Influencing the Conversion of Magnesium Nitrates and Chlorides with Sodium Chlorate
F. B. Khayriyev
*
Tashkent Institute of Chemical Technology, 41 Mirzo-Ulugbek str., Tashkent, Republic of Uzbekistan.
N. A. Erkaeva
Tashkent Institute of Chemical Technology, 41 Mirzo-Ulugbek str., Tashkent, Republic of Uzbekistan.
A. U. Erkaev
Tashkent Institute of Chemical Technology, 41 Mirzo-Ulugbek str., Tashkent, Republic of Uzbekistan.
B. Kh. Kucharov
The Institute of General and Inorganic Chemistry of the Academy of Sciences, Tashkent, Republic of Uzbekistan.
B. S. Zakirov
The Institute of General and Inorganic Chemistry of the Academy of Sciences, Tashkent, Republic of Uzbekistan.
N. A. Ulashova
The Institute of General and Inorganic Chemistry of the Academy of Sciences, Tashkent, Republic of Uzbekistan.
*Author to whom correspondence should be addressed.
Abstract
Aim: This study investigated the feasibility of directly producing chlorate defoliants from secondary mother liquors (SML) via interaction with sodium chlorate.
Study Design: Laboratory investigation of the effects of the SML:NaClO₃ ratio and reaction duration on conversion and phase separation at a constant temperature of 120 °C.
Methodology: The reaction duration was varied from 20 to 90 minutes. The reaction mixtures were subjected to hot filtration and subsequent cooling. The precipitates were characterised by X-ray diffraction, and the mother liquors were examined by ICP analysis and measurements of density and viscosity.
Results: It was established that across the studied range of parameters, the liquid-to-solid (L:S) ratio of the system fluctuates between 3.76:1 and 32:1 in the hot state, and between 1.72:1 and 3.43:1 in the cold state. Depending on the selected conditions, the hot-state solid-phase yield ranged from 2.84 to 17.47 % for the experiments in which a solid phase was obtained. Upon cooling, the filtered liquid phase of almost all samples yielded 21.7–27.7 % solid precipitate. X-ray diffraction showed that the sodium chloride content of the hot-state precipitates varied within 77–100 %, while sodium chlorate (NaClO₃) was present in some hot-state samples.
Conclusion: The results indicate the feasibility of directly processing secondary mother liquors with sodium chlorate and show that the conversion conditions influence the composition of the separated solid phases.
Keywords: Secondary mother liquor, sodium chlorate, magnesium chlorate, conversion, crystallisation, X-ray diffraction, density, viscosity