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Harmless treatment method and device for aluminum ash residues

A harmless treatment and aluminum ash slag technology, applied in the field of aluminum ash treatment, can solve the problems of poor nitrogen removal effect, inability to be widely used, environmental and human hazards, etc., and achieve the effect of improving nitrogen removal rate

Inactive Publication Date: 2019-07-19
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above aluminum ash slag nitrogen removal process, on the one hand, because the generated ammonia gas directly flows into the air, it is harmful to the environment and the human body; Coating the unreacted aluminum nitride, which leads to poor nitrogen removal effect, cannot be widely used in industry. Therefore, it is a research hotspot for those skilled in the art to seek a method and device for harmless treatment of aluminum ash slag.

Method used

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  • Harmless treatment method and device for aluminum ash residues
  • Harmless treatment method and device for aluminum ash residues
  • Harmless treatment method and device for aluminum ash residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] 100 parts by mass of aluminum ash slag are processed, and the main chemical components of the aluminum ash slag are: elemental aluminum 3±2%, aluminum oxide 19±2%, aluminum nitride 9±2%.

[0092] (1) Mechanical ball milling of aluminum ash to 80-200 mesh;

[0093] (2) Take 2 parts by mass of calcium oxide and 0.5 part of sodium carbonate and mix them evenly with aluminum ash. Weigh 2 parts of 30% concentration of hydrogen peroxide, 5 parts of 18% concentration of peracetic acid, 2 parts of acetic acid, 1 part of 30% concentration of dilute sulfuric acid, and mix to obtain solution A;

[0094] (3) Heat 500L of water to 60°C, pour in aluminum ash, add solution A immediately, carry out mechanical stirring, and react for 1.5h;

[0095] (4) Filter the mixed solution after the reaction is completed, select a 300-mesh filter screen for the first filtration, the filtration speed is fast, the aqueous solution is turbid, and a large amount of precipitation is left to stand, and ...

Embodiment 2

[0098] 100 parts by mass of the aluminum ash slag are processed, and the main chemical components of the aluminum ash slag are: elemental aluminum 21±3%, aluminum oxide 5±2%, aluminum nitride 44±3%.

[0099] (1) Mechanical ball milling of aluminum ash to 80-200 mesh;

[0100] (2) 1 part by mass of calcium oxide and 1 part of sodium carbonate are uniformly mixed with aluminum ash. Weigh 3 parts of hydrogen peroxide with a concentration of 30%, 8 parts of peracetic acid with a concentration of 18%, 5 parts of acetic acid, and 1.5 parts of dilute sulfuric acid with a concentration of 30%, and mix them to obtain solution A;

[0101] (3) Heat 800L of water to 70°C, pour in aluminum ash, add solution A immediately, carry out mechanical stirring, and react for 1 hour;

[0102] (4) Filter the mixed solution after the reaction is completed, select a 500 mesh filter screen for the first filtration, the filtration speed is fast, the aqueous solution is turbid, and a large amount of prec...

Embodiment 3

[0105] 100 parts by mass of aluminum ash slag are processed, and the main chemical components of the aluminum ash slag are: elemental aluminum 16±2%, aluminum oxide 18±2%, aluminum nitride 21±2%.

[0106] (1) Manually crush aluminum ash to 80-200 mesh;

[0107] (2) 2 parts by mass of calcium oxide and 1 part of sodium carbonate are mixed evenly with aluminum ash. Weigh 1 part of 30% concentration of hydrogen peroxide, 3 parts of 18% concentration of peracetic acid, 5 parts of acetic acid, 2 parts of 30% concentration of dilute sulfuric acid, and mix to obtain solution A;

[0108] (3) Heat 600L of water to 50°C, pour in aluminum ash and immediately add solution A, carry out mechanical stirring, and react for 2.5 hours;

[0109] (4) Filter the mixed solution after the reaction is completed. For the first filtration, select a 500-mesh filter screen. The filtration speed is fast, but the aqueous solution is turbid. There will be a large amount of precipitation when left standing....

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Abstract

The invention discloses a harmless treatment method and device for aluminum ash residues, wherein the aluminum ash residues comprise aluminum nitride. The harmless treatment method comprises the stepsthat water and a reactant are added into the aluminum ash residues for a nitrogen removal reaction to obtain aluminum ash residue turbid liquid, wherein the aluminum ash residue turbid liquid comprises ammonium salts and aluminum ash residues subjected to nitrogen removal, and the reactant comprises one or more of hydrogen peroxide, peracetic acid, calcium oxide, sodium carbonate, acetic acid anddilute sulfuric acid. According to the harmless treatment method and device for the aluminum ash residues, ammonia gas is avoided, the phenomenon that aluminum nitride is coated with aluminum hydroxide is avoided, the nitrogen removal rate is increased, and then the aluminum nitride in the aluminum ash residues is efficiently removed in a low-cost and harmless mode.

Description

technical field [0001] The present disclosure generally relates to the technical field of aluminum ash treatment, and in particular to a method and device for harmless treatment of aluminum ash slag. Background technique [0002] Aluminum ash slag is a kind of industrial waste. The aluminum ash slag produced in the industry contains a large amount of nitrogen, and its main chemical composition and content are: elemental aluminum 2-15%, alumina 15-30%, aluminum nitride 10% ~40%, and other oxides and salts, etc. Aluminum ash slag in a humid environment, aluminum nitride is prone to hydrolysis reaction with water to generate ammonia gas with a pungent smell, which seriously affects human health. According to the "National Hazardous Waste List" in the 2016 edition, aluminum ash slag belongs to non-ferrous metal smelting waste (HW48). The storage, transportation and disposal of aluminum ash slag are required to be implemented in accordance with the system and procedures of hazar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/30A62D101/45
CPCA62D3/30A62D2101/45
Inventor 倪红军唐伟佳汪兴兴吕帅帅李志扬朱昱黄明宇廖萍周宇翔杜凯峰孟月陈科倪威顾涛
Owner NANTONG UNIVERSITY
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