Recycling using method of aluminum ash at last time

Abstract

The invention discloses a recycling using method of aluminum ash at the last time. The recycling using method has the steps that 1, water and a catalyst are added to the aluminum ash at the last timeunder stirring and turning over conditions, a pasty fluid is formed, heating and catalytic decomposition deamination are conducted on the pasty fluid, and escape ammonia generated by catalytic decomposition deamination enters an ammonia absorption tower; 2, in the ammonia absorption tower, spraying water or dilute acid are used to conduct collection to the escape ammonia, and ammonia water or ammonium salt serous fluid are obtained; ammonia water is in cyclic utilization, the generated ammonium salt serous fluid falls into a settling pond in the bottom of the ammonia absorption tower, the ammonium salt serous fluid is sent into a filter press through a pump to be conducted filter pressing dehydration; and the ammonium salt solid obtained after dehydration is recycled and used; 3, drying isconducted; the obtained materials after deamination in the step 1 are added to shoe cover materials, the obtained materials after deamination in the step 1 and the shoe cover materials enter into anelectrolytic cell together; calcinations is conducted by using the electrolytic cell temperature, and calcinations material mixture is formed; and 4, after the calcinations material mixture is crushed, the calcinations material mixture enters into the electrolytic cell to be used as raw materials.

Description

technical field [0001] The invention relates to the technical field of recycling of industrial aluminum ash, in particular to a method for recycling the last aluminum ash. Background technique [0002] Aluminum ash is the slag and floating skin produced in the process of aluminum liquid, aluminum ingot, and secondary aluminum smelting and refining aluminum. The last aluminum ash is a kind of scum produced in the casting production of the aluminum industry, which is in the form of loose ash. The last aluminum ash is a kind of industrial waste residue with large output and serious pollution. It mainly comes from the casting process of electrolytic aluminum plants, aluminum processing plants and the smelting and casting process of secondary aluminum plants. According to statistics, about 20-40 kg of aluminum ash is produced for each ton of raw aluminum processed. The amount produced is less when the aluminum liquid is directly melted and cast, and the amount is more when the al...

AI Technical Summary

Problems solved by technology

[0004] The aluminum ash recycling technology of the prior art has the following deficiencies: (1) all need to be provided with special refining equipment to extract pure aluminum and alumina, the equipment investment is too large, the process flow is long, the refining cost is high, the refining difficulty is large, and the energy Serious waste and secondary pollution; 2. The recycling of ammonia and chloride in aluminum ash is not considered; 3. There is no effective recycling of the last aluminum ash, which is likely to cause environmental pollution