Comprehensive utilization method of aluminum ash
A treatment method and technology for aluminum ash, which are applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, the preparation/separation of ammonia, and the preparation of ammonium salt, etc. , long process flow and other problems, to avoid atmospheric dust pollution, ensure environmental safety, and achieve the effect of huge economic benefits
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Embodiment 1
[0026] A method for comprehensive utilization of aluminum ash, comprising the following steps:
[0027] Catalytic deamination step: take aluminum ash with a weight percentage content of less than 2% of metal aluminum, add water to the aluminum ash, form a paste under stirring, keep the water weight percentage in the paste at 5%, and add a catalyst Carry out catalytic decomposition and deamination, the catalyst used is sodium organic acid, and the catalyst dosage is 0.1% of the dry weight of aluminum ash. Ammonia gas absorption tower, adopts spray water to collect in the ammonia gas absorption tower, obtains ammonia water;
[0028] Forming step: add sodium hydroxide solution to the remaining paste after the catalytic deamination step, the weight of sodium hydroxide is 10% of the dry weight of aluminum ash, mix evenly, process and shape with a forming machine to obtain dispersed particles, dispersed particles The shape can be spherical, elliptical, cylindrical, cube, cuboid and...
Embodiment 2
[0032] A method for comprehensive utilization of aluminum ash, comprising the following steps:
[0033] The step of separating metal aluminum from aluminum ash: take the aluminum ash whose weight percentage of metal aluminum is greater than 2%, grind the aluminum ash, and sieve the aluminum ash. The flakes are collected, and the low-alumina aluminum ash enters the catalytic deamination step;
[0034] Catalytic deamination step: add water to the undersize low-aluminum aluminum ash, and form a paste under the action of stirring. The weight percentage of water in the paste is 50%, and then add a catalyst for catalytic decomposition and deamination. The catalyst used is It is sodium aluminate, the amount of catalyst used is 100% of the dry weight of aluminum ash, the temperature of catalytic decomposition and deamination reaction is 20°C, and the reaction time is 2h, and the ammonia gas generated by catalytic decomposition and deamination is collected in an ammonia gas absorption ...
Embodiment 3
[0039] A method for comprehensive utilization of aluminum ash, comprising the following steps:
[0040] The step of separating metal aluminum from aluminum ash: take the aluminum ash whose weight percentage of metal aluminum is greater than 2%, carry out wet grinding on the aluminum ash, and sieve. , the metal aluminum flakes are collected, and the low-aluminum aluminum ash enters the catalytic deamination step;
[0041] Catalytic deamination step: the undersieve low-aluminum aluminum ash slurry is precipitated and concentrated to form a paste. The weight percentage of water in the paste is 15%, and then a catalyst is added for catalytic decomposition and deamination. The catalyst used is sodium acetate The mixture with sodium aluminate, the amount of catalyst used is 3% of the dry weight of aluminum ash, the temperature of catalytic decomposition and deamination reaction is 50°C, the reaction time is 1h, and the ammonia gas generated by catalytic decomposition and deamination...
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