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Process and system for thermal treatment of granular solids

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

Active Publication Date: 2018-02-16
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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  • Process and system for thermal treatment of granular solids
  • Process and system for thermal treatment of granular solids
  • Process and system for thermal treatment of granular solids

Examples

Experimental program
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Effect test

Embodiment 1

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

[0099] Table 1:

[0100]

[0101] Test V1 shows conventional heating: compared to this, tests V2, V3 and V4 show that the particle fractionation can be substantially reduced by decidedly slower heating. Test V5 shows that even a first rapid heating with a first ramp and a subsequent stabilization by a second heating ramp, which is much slower, still produces the effect according to the ...

Embodiment 2

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

[0104] In the first run, the residence time of the particles in the second preheating phase 20 was ≦2-5 s. Due to the temperature rise of 165°C (=330°C-165°C), the heating rate is between 33 and 82.5K / s, and thus >15K / s. The result is about 5% by weight of particles with a diameter < 10 μm.

[0105] In contrast, using the image 3system. Again, 250,000 kg / h of aluminum hydrate with a moisture content of 7% by weight of water was fed into the system at ambient temperature. In a first preheating stage 10, the hydrate is brought to a temperature of 165°C. In the second preheating...

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Abstract

The invention relates to a process and the respective installation for thermal treatment of granular solids, in particular for producing aluminum oxide from aluminum hydroxide, wherein the solids areheated in at least one preheating stage and then reacted in a reactor at 700 to 1400 degree. In at least one preheating stage, the average temperature gradient of the solids amounts to <15K / s and thedwell time of the solids amounts to >=15 s.

Description

technical field [0001] The present invention relates to a process for the thermal treatment of granular solids, wherein 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 carrying out the method. Background technique [0002] In the production of metals and their salts, the thermal treatment of raw materials is usually part of the respective production process, such as the calcination of ores. Thermal treatment of the solid is also necessary in the production of metal oxides, especially since this is usually produced from another metal salt by calcination, for example from titanium dioxide hydrate to produce a mixed rutile phase (see eg DE 26 05 651 A1). [0003] For example, the production of aluminum oxide (Al 2 o 3 ) (as known from EP 0 861 208 B1) is of particular economic importance. In this method, moist aluminum hydroxide is first dried and preheated to a temperature of...

Claims

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Application Information

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Patent Type & Authority Applications(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
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