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Processing reusing method for industrial sludge solid waste containing aluminum hydroxide

A technology for industrial sludge and solid waste, applied in solid waste removal, alumina/hydroxide preparation, dehydration/drying/thickened sludge treatment, etc., can solve environmental pollution problems, achieve simple operation, save calcination The effect of low cost and energy consumption

Inactive Publication Date: 2010-01-13
袁昧生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of industrial sludge containing aluminum hydroxide existing in the prior art, such as simple treatment and environmental pollution, the present invention provides a method for processing and reusing industrial sludge containing aluminum hydroxide solid waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: A method for processing and reusing aluminum hydroxide-containing industrial sludge solid waste, first drying the material, and then calcining the material:

[0015] In the material drying step, the temperature in the kiln for loading and drying is 120°C, the holding time is 48 hours, and the dehydration rate of the material is 65%-75%. Collect and store dried materials.

[0016] The material loaded into the drying kiln is naturally loose and should not be compacted to ensure the porosity of the material during the drying process, so that the water vapor can evaporate as soon as possible and ensure the circulation of water vapor. The thickness of the kiln material: 350mm at the side and 500mm in the middle.

[0017] In the material calcination step, kiln loading: material packing density 1.0g / cm 3 , the overall kiln capacity in the kiln is 80%, and the flame injection space is 15m 3 .

[0018] Specifically, ① free water is excluded, the temperature in t...

Embodiment 2

[0028] Embodiment 2: A method for processing and reusing aluminum hydroxide-containing industrial sludge solid waste, first drying the material, and then calcining the material:

[0029] In the material drying step, the temperature in the kiln for charging and drying is 150° C., the holding time is 36 hours, and the dehydration rate of the material is 70%. Collect and store dried materials.

[0030] In the material calcination step, kiln loading: material packing density 1.4g / cm 3 , the installed kiln capacity is 85%, and the flame injection space is 10m 3 .

[0031] Specifically, ① free water is excluded, the temperature in the kiln is 150 ℃, and the holding time is 12 hours.

[0032] Observe the change of flue gas, control the discharge of water vapor, and ensure the safe operation of the calcining kiln.

[0033] ②Primary crystallization dehydration, the heating rate is 20°C / hour, reaching the dehydration temperature of 450°C, and holding for 5 hours.

[0034] ③Dehydrat...

Embodiment 3

[0038] Embodiment 3: A method for processing and reusing aluminum hydroxide-containing industrial sludge solid waste, first drying the material, and then calcining the material:

[0039] In the material drying step, the temperature in the kiln for loading and drying is 130° C., the holding time is 42 hours, and the material dehydration rate is 68%. Collect and store dried materials.

[0040] In the material calcination step, kiln loading: material packing density 1.2g / cm 3 , the installed kiln capacity is 84%, and the flame injection space is 13m 3 .

[0041] Specifically, ① free water is removed, the temperature in the kiln is 125°C, and the holding time is 14 hours. Observe the change of flue gas, control the discharge of water vapor, and ensure the safe operation of the calcination kiln.

[0042] ②Primary crystallization dehydration, the heating rate is 22°C / hour, reaching the dehydration temperature of 475°C, holding for 4 hours,

[0043] ③Dehydration of gibbsite, the ...

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Abstract

The invention relates to a method for processing industrial waste, in particular to a method for processing and reusing the solid waste containing aluminum hydroxide industrial sludge. The method can solve the problems of the prior art of simple treatment and environment pollution of the industrial sludge containing the aluminum hydroxide. The method includes the steps: material is put in a drying kiln and then put in a calcining kiln; in particular to that free water is excluded; primary crystallization is dehydrated; gibbsite is dehydrated; secondary crystallization is dehydrated; crystal form of the aluminum hydroxide is transformed to Gamma-Al2O3 and Alpha-Al2O3. By adopting calcination measures of gradient elevation of temperature and stage heat preservation to process the industrial sludge containing the aluminum hydroxide, the method for processing the industrial waste has simple operation and low consumption and can save calcination cost by 15 percent with a good calcination effect, improve transformation rate of the crystal form of the aluminum hydroxide by 20 percent; the Alpha-Al2O3 is larger than 84 percent; water content is less than 0.5 percent; furthermore, the method improves volume density of the calcination material by 25 percent with the volume density more than 3.2g / cm<3>; the processing technology is secure and reliable.

Description

technical field [0001] The invention relates to a method for treating industrial waste, in particular to a method for processing and reusing industrial sludge solid waste containing aluminum hydroxide. Background technique [0002] During the processing of aluminum alloys, aluminum-magnesium alloys and aluminum-containing workpieces, chemical methods are used to process the surface of metal materials, thereby forming industrial sludge containing aluminum hydroxide. The main ingredient is aluminum hydroxide, and the current treatment method is to bury it in a special garbage dump. This treatment method apparently eliminated industrial waste pollution, but did not fundamentally solve the problem of industrial waste. It is an important development direction for my country's sustainable development to further process and reuse industrial sludge solid waste containing aluminum hydroxide, turn waste into treasure, solve industrial solid waste, and realize recycling. Contents of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30B09B3/00C02F11/12
Inventor 袁昧生刘效文
Owner 袁昧生
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