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- W2022250488 abstract "Sulphuric acid decomposition of a fluorite flotation concentrate can be intensified by AC excitation, by additives diminishing the sulphuric acid viscosity and surface tension, as well as by air calcination, thus activating the fluorite flotation concentrate. Research carried out has determined that calcination in ambient air containing 23.1–50.0% of oxygen proceeds in several series-parallel stages. At the first stage, at 240–530 °C dehydration, the organic flotation reagents are removed and a partial sulphides decomposition take place. At the second stage, at 560–650 °C the sulphides get reoxidized and the carbonates are thermally decomposed. Studies on the sulphuric acid decomposition of calcined fluorite flotation concentrate have shown that the decomposition process proceeds in two stages at 45–192 °C and at 158–280 °C. It is noteworthy that in the case of uncalcined fluorite decomposed with sulphuric acid, the mass of hydrogen fluoride generated in both the first and second stages is about equal, and in the case of calcinated fluorite the hydrogen fluoride generated at the first stage amounts to 60–75%. The kinetic data have shown that the preliminary calcination of fluorite facilitated the transition from the diffusion area to the kinetic one: the observed reaction order at the first stage increases from 0.58 to 0.93–1.03, and the apparent activation energy from 71.5 to 91.8–124.7 kJ/mol." @default.
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- W2022250488 date "1992-08-01" @default.
- W2022250488 modified "2023-09-27" @default.
- W2022250488 title "A study of fluospar properties affecting the hydrogen fluoride formation mechanism" @default.
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