Aluminum ash hydrolysis denitrogenating device control method

Abstract

The invention discloses an aluminum ash hydrolysis denitrogenating device control method, which comprises the following steps that aluminum ash hydrolysis reaction is performed in a reaction kettle; an exhaust opening of the reaction kettle is connected with a primary absorption tank; ammonia gas and ammonia water containing steam are exhausted into the primary absorption tank; a concentration detection device arranged in the primary absorption tank detects liquid concentration in the primary absorption tank; a controller receives the detection value of the concentration detection device; whether the detection value is greater than the concentration set value or not is compared; if the detection value is greater than the concentration set value, the operation enters the next step; otherwise, the steps are repeated; the controller controls corresponding valves to be opened; liquid in the primary absorption tank is discharged into a liquid storage tank; then, the liquid in the secondaryabsorption tank is discharged into the primary absorption tank; a water supply device supplies water to the secondary absorption tank. The technical scheme provided by the embodiment has the advantages that through the arrangement of multi-stage absorption tanks, ammonia gas after reaction and ammonia water containing steam are effectively absorbed; nitrogen elements are recovered, stored and utilized; the resources are saved.

Description

technical field [0001] The present disclosure generally relates to a recycling device for aluminum ash slag, in particular to a device for denitrifying aluminum ash slag by hydrolysis. Background technique [0002] Aluminum ash (aluminum ash / aluminum slag) is a common waste in the aluminum industry with a huge output. Its main source is the infusible inclusions, oxides, and additives floating on the surface of the aluminum melt during the smelting of aluminum and the production of aluminum alloys. And the reaction products produced by physical and chemical reactions with additives, etc., are produced in all production processes where aluminum is melted. [0003] During the aluminum smelting process, it is usually necessary to fill the furnace with nitrogen to accelerate purification and purification. A part of the nitrogen is absorbed by the aluminum ash floating on the surface of the aluminum water when it evaporates, so the aluminum ash contains nitrogen; and aluminum nitr...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many methods for utilizing nitrogen in aluminum ash slag, which basically stay at the theoretical level, but there are very few recycling devices for nitrogen in aluminum ash slag

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