Method for preparing beta-SiAlON from aluminum ash residues

A technology of aluminum ash and aluminum elements, which is applied in the field of preparing β-SiAlON materials, can solve problems such as low purity, difficult process control, and complex raw material components, and achieve the effects of reducing resource waste, reducing environmental burden, and simple process

Active Publication Date: 2019-09-06
NORTHWEST A & F UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum ash + blast furnace slag + metal silicon system, synthesized Ca-α-SiAlON-AlN polytype composite ceramics, due to the high content of CaO, it is easy to form a glass phase, which is not conducive to the synthesis of SiAlON phase; aluminum ash + pulverized coal Ash + carbon black system, the main phase prepared by the optimized carbothermal aluminothermic composite reduction nitriding process (1450 °C, Si/Al ratio of 1, 1.5) is β-SiAlON and AlN polytype, but must pass two The preparation of the material can only be realized by the single-step method; t...

Method used

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  • Method for preparing beta-SiAlON from aluminum ash residues
  • Method for preparing beta-SiAlON from aluminum ash residues

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Experimental program
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Effect test

Embodiment 1

[0025] 1. Aluminum slag treatment: aluminum slag is ground and passed through a 60-mesh sieve. According to the analysis results of the X-ray fluorescence spectrometer, the aluminum element in the aluminum slag used in this embodiment (from aluminum, aluminum oxide in the aluminum slag, Aluminum nitride, etc.) the mass fraction is 37.4%;

[0026] 2. Ingredients: According to the element molar ratio of Si powder and Al in aluminum ash slag is 1:1, the total weight of raw materials is 2g, after calculation, weigh 1.40g of aluminum ash slag, 0.54g of Si powder, and Si 3 N 4 0.06g (Si 3 N 4 Consumption is 3wt.% of raw material gross weight);

[0027] 3. Ball milling: Add the raw materials obtained in the previous step into a ceramic ball milling dish, the mass ratio of zirconia ceramic balls to raw materials is 3:1, and grind on a planetary ball mill at 500r / min for 10min;

[0028] 4. High-temperature nitriding reaction: Spread the uniformly ball-milled raw material in a cera...

Embodiment 2

[0031] 1. Aluminum slag treatment: the aluminum slag is ground and passed through a 60-mesh sieve. According to the analysis results of the X-ray fluorescence spectrometer, the mass fraction of aluminum in the aluminum slag used in this embodiment is 37.4%;

[0032] 2. Ingredients: According to the element molar ratio of Si powder and Al in aluminum ash slag is 2.5:1, the total weight of raw materials is 2g, after calculation, weigh 0.98g of aluminum ash slag, 0.96g of Si powder, and Si 3 N 4 0.06g (Si 3 N 4 Consumption is 3wt.% of raw material gross weight);

[0033]3. Ball milling: Add the raw materials obtained in the previous step into a ceramic ball milling dish, the mass ratio of zirconia ceramic balls to raw materials is 3:1, and grind for 15 minutes on a planetary ball mill at 500r / min;

[0034] 4. High-temperature nitriding reaction: Spread the uniformly ball-milled raw material in a ceramic (zirconia) crucible, send it into a tubular atmosphere furnace, and fill ...

Embodiment 3

[0037] 1. Aluminum slag treatment: the aluminum slag is ground and passed through a 60-mesh sieve. According to the analysis results of the X-ray fluorescence spectrometer, the mass fraction of aluminum in the aluminum slag used in this embodiment is 37.4%;

[0038] 2. Ingredients: According to the element molar ratio of Si powder and Al in aluminum ash slag is 5:1, the total weight of raw materials is 2g, after calculation, weigh 0.66g of aluminum ash slag, 1.28g of Si powder, and Si 3 N 4 0.06g (Si 3 N 4 Consumption is 3wt.% of raw material gross weight);

[0039] 3. Ball milling: add the raw materials obtained in the previous step into a ceramic ball milling dish, the mass ratio of zirconia ceramic balls to raw materials is 3:1, and grind on a planetary ball mill at 500r / min for 20min;

[0040] 4. High-temperature nitriding reaction: Spread the uniformly ball-milled raw material in a ceramic (zirconia) crucible, send it into a tubular atmosphere furnace, and fill it wit...

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Abstract

The invention relates to a method for preparing beta-SiAlON from aluminum ash residues. The method comprises the following steps: grinding the aluminum ash residues, adding a Si powder and a diluent Si3N4 powder in proportion, performing uniform mixing by a ball mill, adding the obtained mixture into a zirconia crucible, placing the crucible in a tubular atmosphere furnace, introducing nitrogen, carrying out ohmic heating to reach a reaction temperature, cooling the furnace to room temperature after a nitridation reaction is completed, and taking out the obtained product. The industrial solidwastes which are aluminum ash residues are used as the raw material to prepare high-purity beta-SiAlON powder, so the method has the advantages of simple process, realization of recycling of the aluminum ash residues, reduction of the environmental burden, and reduction of resource waste.

Description

technical field [0001] The invention relates to resource utilization of industrial solid waste and preparation of nitrogen oxide ceramic powder, in particular to a method for preparing β-SiAlON material by using aluminum ash. Background technique [0002] Aluminum ash is a kind of industrial waste, which is generally produced in the aluminum processing and production processes such as aluminum electrolysis and aluminum smelting. The composition of aluminum ash slag is complex, mainly containing metals (Al, Fe, Ca, Mg, etc.), alumina, silica, nitrides, carbides, etc., among which aluminum and alumina are the most abundant, up to 10-50%. In order to make full use of aluminum resources and avoid waste of resources, it is necessary to carry out the research and development of high value-added recycling technologies for aluminum ash slag and further improve the comprehensive utilization efficiency of aluminum ash slag. [0003] In the comprehensive utilization of aluminum ash sl...

Claims

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Application Information

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IPC IPC(8): C01B21/082
CPCC01B21/0826C01P2002/72C01P2002/74
Inventor 衣雪梅李青达朱炜军
Owner NORTHWEST A & F UNIV
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