Hydrometallurgical processing of Egyptian magnesite ore with nitric acid
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Central Metallurgical Research and Development Institute, Cairo
Publication date: 1997-01-01
Physicochem. Probl. Miner. Process. 1997;31(1):7-17
Egyptian magnesite ore (43.32% MgO) from the Eastern Desert was leached with aqueous nitric acid and the following optimum conditions of leaching were determined: ore particle size 100% –0.5 mm, temperature 50 °C, leaching time 30 min, HNO3 to MgO molar ratio 1.05, and liquid/solid ratio of 2.8:1.0 ml/g. These conditions lead to recovery of 96.2% MgO. Resultant liquor was first treated with stoichiometric amount of sulfuric acid in order to precipitate calcium ions and then was neutralized with MgO. Purified magnesium nitrate solution was evaporated and magnesium nitrate crystals of 99.7% purity were obtained. Block flowsheet of this process was proposed.
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