Aluminum ash recycling method

A technology of aluminum ash and secondary aluminum, which is applied to the preparation/separation of alumina/hydroxide and ammonia, which can solve the problems of low recovery rate of aluminum slag treatment, large energy consumption, and large waste, so as to avoid atmospheric dust Effects of pollution, avoidance of pollution, avoidance of air pollution

Active Publication Date: 2017-06-13
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the recovery rate of aluminum slag treatment in our country is low, and the energy consumption and waste are large. We should vigorously develop new technologies and adopt advanced equipment to change this backward state

Method used

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  • Aluminum ash recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 2 As shown, the primary aluminum ash is recycled, including steps:

[0033] S1: Separation of aluminum ash and metal aluminum: Grinding and sieving the aluminum ash, the oversieve is metal aluminum flakes, and the undersieve is aluminum ash powder. The metal aluminum flakes can be collected directly or washed with water before being collected. Aluminum ash The powder enters the following deamination step;

[0034] S2: Deamination treatment, the aluminum ash powder and water are mixed in the mixing tank according to the mass ratio of 1:1~1:4, the mixing time is 5~15h, and the temperature is kept at 78~82°C. Ammonia gas, the ammonia gas is absorbed by strong acid through the absorption tower to make ammonium salt, and the slurry after pulping is pumped to the pressurized reaction kettle;

[0035] In the above-mentioned deamination treatment, the aluminum ash powder and water are mixed according to a certain mass ratio, and the slurry is mixed at a certain t...

Embodiment 2

[0042] like image 3 As shown, the secondary aluminum ash is recycled and reused, including steps:

[0043] S1: Separation of aluminum ash and metal aluminum: Grinding and sieving the aluminum ash, the oversieve is metal aluminum flakes, and the undersieve is aluminum ash powder. The metal aluminum flakes can be collected directly or washed with water before being collected. Aluminum ash The powder enters the following deamination step;

[0044] S2: Deamination treatment, mixing aluminum ash powder and water in a mixing tank at a mass ratio of 1:1 to 1:3 for 5 to 10 hours, and keeping the temperature at 68 to 72°C. Ammonia gas, the ammonia gas is absorbed by strong acid through the absorption tower to make ammonium salt, and the slurry after pulping is pumped to the pressurized reaction kettle;

[0045]In the above-mentioned deamination treatment, the aluminum ash powder and water are slurried according to a certain mass ratio, and the slurry is slurried at a certain tempera...

Embodiment 3

[0055] like Figure 4 As shown, when recycling the three-time aluminum ash, it includes: S1: fully mix the three-time aluminum ash and alkali solution and let it stand for 3-5 hours, the ammonia gas generated is absorbed through the absorption tower, and the insoluble impurities are filtered out; The aluminum ash is directly washed three times with alkali, so that alumina, aluminum, etc. are fully dissolved, and ammonia gas is generated during the alkali washing process, which can be absorbed through the absorption tower; the ammonia gas can be made into ammonium salt for recycling, and the reaction equation is as follows as shown,

[0056] al 2 o 3 +2NaOH=2NaAlO 2 +H 2 O;

[0057] 2Al+2NaOH+2H 2 O=2NaAlO 2 +3H 2 ;

[0058] 2AlN+3H 2 O=Al 2 o 3 +2NH 3 ;

[0059] al 2 o 3 +2NaOH=2NaAlO 2 +H 2 O;

[0060] S2: Add equimolar hydrochloric acid, let it stand for a period of time to fully react to form aluminum hydroxide precipitate and filter, calcinate the precip...

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Abstract

The invention discloses an aluminum ash recycling method. The aluminum ash recycling method comprises the following steps: deamination: aluminum ash powder and water or aqueous alkali are subjected to pulp mixing in a certain mass ratio, ammonia is produced in the pulp mixing process and absorbed by an absorption tower with strong acid, ammonium salt is prepared, and pulp obtained through pulp mixing is delivered by a pump to a pressurized reactor; preparation of aluminum oxide: the pulp is pickled according to different aluminum contents in aluminum ash, then aqueous alkali is added or alkali washing is performed, an acid solution is added for treatment, precipitates are produced, filtered and calcined, aluminum oxide powder is formed, a filtrate is heated to be concentrated, and industrial salt is obtained. When the aluminum ash is recycled with the technical scheme, useful components in the aluminum ash can be recovered to the greatest extent, environmental pollution caused by aluminum ash processing is avoided, the recovered ammonia can be directly applied to flue gas desulfurization and denitrification forelectrolytic aluminum or aluminum fabrication enterprises, and harmlessness, recycling and benefits of aluminum ash treatment are realized.

Description

technical field [0001] The present disclosure generally relates to the field of recycling aluminum ash, and in particular to a method for recycling aluminum ash. Background technique [0002] Aluminum ash is an important solid waste in the aluminum industry with a huge amount. It is mainly derived from infusible inclusions, oxides, additives, and reaction products produced by physical and chemical reactions with additives floating on the surface of aluminum melt during the production process of smelting aluminum and aluminum alloys. It is produced in all production processes where aluminum is melted. process. The composition of aluminum ash varies slightly due to different raw materials and operating conditions of various manufacturers, but usually contains metal aluminum, aluminum oxides, nitrides and carbides, salts, other metal oxides (such as Si0 2 , MgO) and some other components. In addition, the covering agent used in the casting or refining process leads to a cert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01C1/02
CPCC01C1/02C01F7/02
Inventor 倪红军刘朋胡妙关汪兴兴吕帅帅朱昱黄明宇
Owner NANTONG UNIVERSITY
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