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Low-temperature catalytic denitrification method for aluminum ash final ash

A technology of low-temperature catalysis and aluminum ash, which is applied in chemical instruments and methods, aluminum compounds, alkali metal aluminate/aluminum oxide/aluminum hydroxide preparation, etc. It can solve the problems of high temperature, reduce energy consumption, avoid threats, Effect of Improving AlN Conversion Efficiency

Pending Publication Date: 2020-11-17
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method needs to remove nitrogen by high temperature roasting, the temperature is as high as 1300 ℃

Method used

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  • Low-temperature catalytic denitrification method for aluminum ash final ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] S10 pretreatment, the final ash of aluminum ash is first sieved to remove slag, then ground and passed through a 150-mesh sieve.

[0030] S20 Wash the final ash of aluminum ash after grinding to remove soluble salt.

[0031] S30 Mix sodium fluoride, potassium hydroxide, sodium metaaluminate, and sodium carbonate in proportion to obtain a catalyst, mix the catalyst with aluminum ash final ash ball mill for removing soluble salts, and place them in a crucible to obtain a first mixture, Wherein the catalyst is 10% of the dry weight of the aluminum ash.

[0032] S40 Place the crucible containing the first mixture in a resistance furnace at 500° C. for 5 hours, and after the calcination, take it out and grind it to complete the catalytic denitrification process. The nitrogen content of the aluminum ash slag after denitrification treatment is tested to be less than or equal to 1%.

Embodiment 2

[0034] S10 pretreatment, the aluminum ash final ash is first screened to remove slag, then ground and passed through a 120-mesh sieve. S20 Wash the final aluminum ash after grinding to remove soluble salt

[0035] S30 Mix cryolite, sodium peroxide, sodium hydroxide, and sodium carbonate in proportion to obtain a catalyst, mix the catalyst with aluminum ash final ash ball mill for removing soluble salts, and place them in a crucible to obtain a first mixture, wherein The catalyst is 40% of the dry weight of the aluminum ash.

[0036] S40 Place the crucible containing the first mixture in a resistance furnace at 600° C. for 4 hours and roast it. After the roasting, take it out and grind it to complete the catalytic denitrification process. The nitrogen content of the aluminum ash slag after denitrification treatment is tested to be less than or equal to 1%.

Embodiment 3

[0038] S10 pretreatment, the final ash of aluminum ash is first sieved to remove slag, then ground and passed through a 150-mesh sieve.

[0039] S20 Wash the final ash of aluminum ash after grinding to remove soluble salt.

[0040] S30 Mix sodium fluoride, sodium peroxide, potassium hydroxide, and sodium carbonate in proportion to obtain a catalyst, mix the catalyst with aluminum ash final ash ball mill for removing soluble salts, and place them in a crucible to obtain a first mixture, wherein The catalyst is 50% of the dry weight of the aluminum ash.

[0041] S40 Place the crucible containing the first mixture in a resistance furnace at 700° C. for 2 h, take it out and grind it after the calcination, and complete the catalytic denitrification process. The nitrogen content of the aluminum ash slag after denitrification treatment is tested to be less than or equal to 1%.

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PUM

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Abstract

The invention provides a low-temperature catalytic denitrification method for aluminum ash final ash. The method comprises the following steps that S20, aluminum ash final ash generated after grindingtreatment is washed with water to remove soluble salt; S30, the aluminum ash final ash with the soluble salt removed is uniformly mixed with a catalyst to obtain a first mixture; and S40, the first mixture is roasted in a resistance furnace of 500-700 DEG C for a certain period of time, after roasting is finished, the first mixture is taken out to be ground, and the catalytic denitrification process is completed. The catalyst comprises villiaumite, sodium carbonate, alkaline substances and a strong oxidant. According to the low-temperature catalytic denitrification method for aluminum ash final ash, the mixture of the villiaumite, the sodium carbonate, the alkaline substances and the strong oxidant is used as the catalyst, a special atmosphere similar to O<x>F<2x> can be generated in theroasting process, the AlN conversion efficiency can be remarkably improved, and the energy consumption is remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of aluminum ash denitrification, in particular to a low-temperature catalytic denitrification method for aluminum ash final ash. Background technique [0002] Aluminum ash comes from various processes of industrial smelting aluminum and aluminum alloys, and the annual output is huge. At present, the main methods of processing aluminum ash are stacking, landfill and primary resource utilization. Therefore, harmful components in aluminum ash enter the soil and float to into the atmosphere, thereby polluting the environment. The "National Hazardous Waste List (Revised Draft)" (Draft for Comment) in December 2019 also clearly identified recycled aluminum ash as hazardous waste, and its hazardous characteristic is R (reactivity). The main components in aluminum ash are alumina, aluminum nitride and several soluble salts, etc., and aluminum nitride will produce NH in a humid environment 3 Therefore, before the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C01F7/04
CPCB09B3/00B09B5/00C01F7/0693B09B3/40
Inventor 倪红军张煜吕帅帅汪兴兴郑泽斌高煜孟奇周昆阳李松元张福豹朱昱
Owner NANTONG UNIVERSITY
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