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Process and plant for producing metal oxide from metal salts

A technology of metal salts and oxides, applied in the direction of oxide/hydroxide preparation, aluminum compounds, chemical instruments and methods, etc., to achieve the effect of reducing energy consumption and energy loss

Active Publication Date: 2013-11-06
METSO OUTOTEC (FINLAND) OY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conventional process requires about 3000kJ / kg of energy consumption to produce alumina

Method used

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  • Process and plant for producing metal oxide from metal salts

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Embodiment Construction

[0023] According to the flow diagram of the process of the present invention shown in the figure, wet filtered aluminum hydroxide (Al(OH) 3 ) are charged at charging station 1. Through conduit 2, aluminum hydroxide is introduced into hydrate dryer 3, where the hydrate is heated to about 100 to 110 by indirect heat exchange with a liquid heat transfer medium, especially water. ℃ temperature, and continue to be almost completely dried from a humidity of, for example, 6%. The dried hydrate is then supplied to the suspension heat exchanger 4 of the first preheating stage and preheated to a temperature of 100 to 200°C. The temperature control in the hydrate dryer is achieved according to the humidity of the supplied hydrate, making it possible to react quickly to fluctuations in the feed without reducing the energy efficiency of the plant.

[0024] A partial flow of hydrates can be fed directly to the suspension heat exchanger 4 via a bypass conduit 5 bypassing the hydrate dryer ...

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Abstract

A process for producing metal oxide from a metal salt includes supplying a first part of the metal salt to a hydrate drier so as to indirectly heat the first part of the metal salt in the hydrate drier using a heat transfer medium from a first stage of a multi-stage indirect cooler so as to dry the first part of the metal salt in the hydrate drier and so as to control a waste gas temperature of the process. A second part of the metal salt is guided as a partial stream past the hydrate drier. The metal salt is preheated in a first preheating stage and precalcined in a second preheating stage. The metal salt and a fluidizing gas having a temperature of 150° C. or less are supplied to a fluidized bed reactor so as to calcine the metal salt to form a metal oxide product. The metal oxide product is cooled in at least one suspension heat exchanger and then in the multi-stage indirect cooler.

Description

technical field [0001] The present invention relates to the production of metal oxides from metal hydroxides or other metal salts, in particular aluminum hydroxide, wherein the metal salt is preheated in a first preheating stage, precalcined in a second preheating stage and The metal oxides are calcined in the reactor, and the products obtained therein are then cooled in at least one suspension heat exchanger and subsequently in multistage indirect coolers. Background technique [0002] Metal hydroxides are raw materials for the production of metal oxides, which represent important building blocks of inorganic chemistry. In their actual presence, metal hydroxides are mainly present in mixed form, so that the raw material must be cleaned. [0003] Aluminum hydroxide is produced, for example, by the so-called Bayer process, in which mined ore (mainly bauxite) is crushed and impregnated with a sodium hydroxide solution. Thus, insoluble residues, such as red mud mainly compris...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/18C01F7/44B01J6/00B01J8/00B01J8/26C01F7/444C01F7/445
CPCC01B13/18C01F7/444C01F7/445B01J6/004B01J8/0055B01J8/006B01J8/24B01J8/00B01J8/26C01F7/44
Inventor M·米萨拉P·希尔图嫩R·布莱E·施米德鲍尔C·克勒特G·施奈德
Owner METSO OUTOTEC (FINLAND) OY