Method for preparing light porous sintered material from aluminum ash

A technology of sintered materials and aluminum ash, which is applied in the field of preparing porous sintered materials by using waste aluminum ash, can solve the problems of low utilization rate and inability to do a large amount of aluminum ash, and achieve low production cost, rich pore structure, and simple production process Effect

Active Publication Date: 2021-03-02
郑州中科新兴产业技术研究院 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention proposes a method for preparing porous sintered materials by using waste aluminum ash, which solves the problems that the current aluminum ash cannot be doped in large quantities and the utilization rate is low

Method used

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  • Method for preparing light porous sintered material from aluminum ash
  • Method for preparing light porous sintered material from aluminum ash
  • Method for preparing light porous sintered material from aluminum ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this example, primary aluminum ash (see Table 1 for specific components) is used as raw material. Since the primary aluminum ash has a relatively high content of metallic aluminum and a high recovery value, it is prioritized for recycling and separation.

[0035] Table 1 Chemical composition of primary aluminum ash (dry basis)

[0036]

[0037] Concrete preparation method comprises the following steps:

[0038] (1) Raw material pretreatment: Weigh 3.0kg of primary aluminum ash raw material, and after several times of graded grinding-screening, 2kg of fine aluminum ash with a particle size of less than 150μm is sorted out; the large particle samples separated by grinding are mainly metallic aluminum , can be recycled by smelting;

[0039] (2) Compounding of silicon raw materials: Weigh 1.0kg of quartz sand raw materials and grind them until the particle size range reaches D 90 <75μm; then mix the pulverized silicon raw material with fine aluminum ash evenly;

[...

Embodiment 2

[0047] The present embodiment adopts primary aluminum ash as a raw material, and the specific preparation method comprises the following steps:

[0048] (1) Raw material pretreatment: Weigh 3.0kg of primary aluminum ash raw material, and after several times of graded grinding-screening, 2kg of fine aluminum ash with a particle size of less than 150μm is sorted out; the large particle samples separated by grinding are mainly metallic aluminum , can be recycled by smelting;

[0049] (2) Compounding of silicon raw materials: Weigh 2.0kg of micro-silica powder as a raw material. Since the particle size of micro-silica powder itself is very small, this step does not need to be ground, and it is directly mixed with fine aluminum ash;

[0050] (3) Dry pressing molding: put the compounded mixture in a pressure mold for dry pressing molding, the molding pressure is 6.0Mpa, and demold after holding the pressure for 1min to obtain a dry billet;

[0051] (4) High-temperature sintering: p...

Embodiment 3

[0054] In this example, the secondary aluminum ash (see Table 2 for specific components) is directly used as the raw material. Due to the small particle size of the secondary aluminum ash, the low content of aluminum in it, and the low recovery value, the preparation process no longer considers the composition of the aluminum metal. to recycle.

[0055] Table 2 Chemical composition of secondary aluminum ash (dry basis)

[0056]

[0057] Concrete preparation method comprises the following steps:

[0058] (1) Raw material pretreatment: Weigh 2.0kg of secondary aluminum ash raw material and grind it to make the particle size range reach D 90 <75μm;

[0059] (2) Compounding of silicon raw materials: Weigh 0.5kg of quartz sand raw materials and grind until the particle size range reaches D 90 <75μm; then mix the pulverized silicon raw material with fine aluminum ash evenly;

[0060] (3) Dry pressing molding: put the compounded mixture in a pressure mold for dry pressing mold...

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Abstract

The invention provides a method for preparing a light porous sintering material from aluminum ash. The method comprises the following steps: (1) carrying out graded grinding and crushing treatment onwaste aluminum ash to remove large-particle components such as metal aluminum and the like in the waste aluminum ash to obtain fine aluminum ash; (2) fully grinding a silicon source to prepare a finesilicon source material; (3) compounding the fine aluminum ash and the fine silicon source material according to a mass ratio of 1-4:1, and fully mixing; (4) adding the mixture into a mold, and carrying out pressure molding to prepare a dry blank; (5) putting the dry blank into a high-temperature furnace, and carrying out calcining treatment to obtain a sintered blank; and (6) cutting and shapingthe sintered blank to prepare a porous material product. According to the invention, the raw materials are wide in source, only a high-silicon material is adopted as an additive, the whole preparationprocess is a dry method, and the environmental problems that aluminum nitride is hydrolyzed when encountering water to generate ammonia gas, fluoride is dissolved out to pollute a water body and thelike are solved.

Description

technical field [0001] The invention relates to the technical field of recycling aluminum ash, in particular to a method for preparing a porous sintered material by using waste aluminum ash. Background technique [0002] Aluminum ash is solid waste discharged during the production of electrolytic aluminum, aluminum processing and secondary aluminum production. According to estimates, the amount of aluminum ash discharged in my country is as high as more than 2 million tons every year. According to different production links, aluminum ash can be divided into primary aluminum ash and secondary aluminum ash. The primary aluminum ash contains high metal aluminum content and has a high utilization value; the waste residue after the primary aluminum ash is extracted from metal aluminum is called secondary aluminum ash. , its valuable components are low, and it contains a large amount of toxic components such as aluminum nitride, fluoride, and chloride salts. On December 30, 2019,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B35/10C04B35/622
CPCC04B38/08C04B35/10C04B35/62204C04B2235/3418C04B2235/3208C04B2235/3206C04B2235/3272C04B2235/3201C04B2235/3865C04B2235/5427C04B2235/5436C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96
Inventor 郭强田登超李永利付明波张灵丁敏
Owner 郑州中科新兴产业技术研究院
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