Process of producing magnesia

Details Process of producing magnesia Process of producing magnesia

C - Chemistry, Metallurgy

01

F

53/260, 23/280

C01F 5/06 (2006.01) C01F 5/12 (2006.01)

Patent

CA 1044871

ABSTRACT OF THE DISCLOSURE: A process for producing magnesia from magnesium- containing carbonate ores, which comprises leaching the ores with sulfuric acid, neutralizing the obtained solution with magnesia, separating the undissolved impurities, crystallizing magnesium sulfate and thermally decomposing the latter to form magnesia and SO2, recovering sulfuric acid from the sulfur dioxide produced in the decomposition step and recycling the sulfuric acid to the leaching stage, wherein a) the crystalli- zation is effected under superatmospheric pressure and at temperatures above 150°C, b) the resulting crystals are separa- ted from the mother liquor under such conditions that the sub- sequent cooling results in a magnesium sulfate which contains 1.5-4 moles of water of crystallization, c) the magnesium sul- fate in such a fineness that it is suitable for being decomposed in a fluidized bed is dewatered and/or heated in a suspension- type-heat-exchanger, and fed through a separator to the fluidized-bed reactor, the exhaust gases of which are used to operate the suspension-type, heat exchanger, d) the reaction product is taken from the fluidized-bed reactor and is fed to a multi-stage fluidized-bed cooler, which is operated with air as fluidizing gas, e) the fluidizing air leaving the fluidized-bed cooler is fed to the fluidized-bed reactor, and f) the heat required for the reaction is generated by an approximately stoichiometric combustion of fuel, which has been charged into the fluidized-bed reactor. Such a process has a high throughput rate and can be carried out in a particularly simple manner,with a high heat economy, in comparison to the known processes.

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