Abstract
A study was made of the solution kinetics in hydrochloric acid of natural magnesite and caustic magnesite dust extracted from the waste gases of rotary kilns. It is shown that the solution rate of caustic dust in cold acid (cold solution method) is 10–12 times higher than the rate for natural magnesite at 80–100°C (hot solution method) and hence the use of dust for obtaining a high purity product would substantially increase the output of the chemical beneficiation plant. In dissolving caustic dust, heating of the solvent (acid) and milling of the material to be dissolved are excluded. Working with cold acid facilitates the choice of chemically resistant equipment and improves working conditions. Chemical beneficiation of the dispersed caustic magnesite dust, including its solution in cold 12.5% HCl, precipitation of sesquioxides, filtration, hydrolysis, and washing of the calcium oxide will improve the highpurity finished product (98.2–99.1% MgO).
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