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Method and system for thermal treatment of granular solids

A granular and solid technology, applied in chemical instruments and methods, chemical/physical processes, aluminum compounds, etc., can solve problems such as air dust, loss of valuable products, etc.

Active Publication Date: 2019-07-16
METSO OUTOTEC (FINLAND) OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this will lead to air dust, which must be removed from the process and lead to loss of valuable products

Method used

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  • Method and system for thermal treatment of granular solids
  • Method and system for thermal treatment of granular solids
  • Method and system for thermal treatment of granular solids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] In accordance with Image 6 In the equipped system, 50,000 kg / h of aluminum hydrate (ie, aluminum hydroxide) with a moisture content of 7% by weight of water is fed into the system at ambient temperature. In the first preheating stage 304, the hydrate is brought to a temperature of 170°C. Next, it is heated to 370°C in the second preheating stage 320, and then calcined in the reactor 332 at 1000°C. In the second warm-up phase The classification of particles below 45μm size depends on the heating process from 170°C to 370°C for a given time:

[0099] Table 1:

[0100]

[0101] Test V1 shows traditional heating: In contrast, tests V2, V3, and V4 show that this particle classification can be greatly reduced by clearly slower heating. Test V5 shows that even with the first rapid heating with the first ramp and the subsequent stabilization by the second ramp (which is much slower), the effect according to the invention is still produced, which can be It is understood as the i...

Embodiment 2

[0103] In accordance with figure 1 In the equipped system, 250,000 kg / h of aluminum hydrate (aluminum hydroxide) with a moisture content of 7% by weight of water is fed into the system at ambient temperature. In the first preheating stage 10, the hydrate is brought to a temperature of 165°C. Then it is heated to 330°C in the second preheating stage 20, and then calcined in the reactor 30 at 1000°C.

[0104] In the first run, the stagnation time of the particles in the second preheating stage 20 is ≤ 2-5s. As the temperature rises by 165°C (=330°C-165°C), the heating rate is between 33 and 82.5K / s, and therefore> 15K / s. As a result, about 5% by weight of particles having a diameter ≤ 10 μm are obtained.

[0105] In contrast, the use of image 3 system. Once again, 250,000 kg / h of aluminum hydrate with a water content of 7 wt% water is fed into the system at ambient temperature. In the first preheating stage 10, the hydrate is brought to a temperature of 165°C. In the second pre...

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Abstract

The invention relates to a method and a corresponding device for the thermal treatment of granular solids, in particular for the production of aluminum oxide from aluminum hydroxide, wherein the solids are heated in at least one preheating stage and then heated in a reactor at 700- React at 1400°C. During at least one preheating stage, the average temperature gradient of the solid is <15 K / s and the residence time of the solid is ≥15 s.

Description

Technical field [0001] The present invention relates to a method for the heat treatment of particulate solids, in which the solids are first heated in at least one preheating stage, and then reacted in a reactor at 700-1400°C. The invention also includes a system for implementing the method. Background technique [0002] In the production of metals and their salts, the heat treatment of raw materials is usually part of various production processes, such as the calcination process of ore. The heat treatment of the solid is also necessary in the production of metal oxides, especially since this is usually produced by calcination from another metal salt, for example a mixed rutile phase from titanium dioxide hydrate (see for example DE 26 05 651 A1). [0003] For example, the production of alumina from aluminum hydroxide (Al 2 O 3 ) (As known from EP 0 861 208 B1) is of special economic importance. In this method, moist aluminum hydroxide is first dried in the first suspension heat ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/44C01F7/445
CPCC01F7/445B01J8/0055B01J8/1836B01J8/1863B01J8/26B01J8/388
Inventor M·斯特罗德P·斯塔姆M·米萨拉C·科勒特
Owner METSO OUTOTEC (FINLAND) OY