Process and plant for producing metal oxide from metal compounds

A technology of metal compounds and oxides, applied in aluminum compounds, chemical instruments and methods, oxygen/ozone/oxide/hydroxide, etc., can solve problems such as difficulties in calcining devices, and achieve the effect of prolonging process conditions
CN1759066BInactive Publication Date: 2010-10-06OUTOKUMPU OY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
OUTOKUMPU OY
Publication Date
2010-10-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a process for producing metal oxide from metal com pounds, in particular metal hydroxide or metal carbonate, in which the metal compound is conveyed into a reactor (25) with fluidized bed, heated there to a temperature of 650 15 to 1150 DEG C by combustion of fuel, and metal oxide is generated, as well as to a corre-sponding plant. To improve the utilization of energy, it is proposed to introduce a first gas or gas mixture from below through a gas supply tube (26) into a mixing chamber (20) of the reactor (25), the gas supply tube (26) being at least partly surrounded by a stationary annular fluidized bed (27) which is fluidized by supplying fluidizing gas, and 20 to adjust the gas velocities of the first gas or gas mixture and of the fluidizing gas for the annular fluidized bed (27) such that the Particle-Froude numbers in the gas supply tube (26) lie between 1 and 100, in the annular fluidized bed (27) between 0.02 and 2, and in the mixing chamber (20) between 0.3 and 30.
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Description

technical field

[0001] The invention relates to a process for the production of metal oxides from metal compounds, especially metal hydroxides or metal carbonates, wherein the metal compounds are fed into a fluidized bed reactor in which the temperature to generate metal oxides, and the present invention also relates to corresponding devices. Background technique

[0002] Known from EP0861208B1 is a method for the production of anhydrous alumina from aluminum hydroxide in a circulating fluidized bed, wherein first the aluminum hydroxide is dried, partially calcined in several preheating sections, and introduced under preheating conditions due to fuel Firing a fluidized bed reactor at a temperature in the range of 800-1000°C produces alumina. The exhaust gas from the fluidized bed reactor obtained during the combustion process is supplied to the preheating section for energy utilization. The metal oxides discharged from the reactor are subjected to multi-stage cooling while...

Claims

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