Removal and Mechanism of Aluminum Nitride from Secondary Aluminum Ash by Hydrolysis
The removal of aluminum nitride is one of the keys processes of the harmless treatment of secondary aluminum ash.The removal of aluminum nitride from secondary aluminum ash in calcium oxide-glucose hydrolysis system was studied.The effects of calcium oxide addition amount,glucose addition amount,hydrolysis temperature,hydrolysis time and liquid volume to solid mass ratio on the removal rate of aluminum nitride were examined.The mechanism of aluminum nitride hydrolysis removal promoted by additives was investigated.The results show that under the optimum hydrolysis conditions of hydrolysis temperature of 90 ℃,hydrolysis time of 2 h,liquid volume to solid mass ratio of 10 mL/1 g,calcium oxide addition amount of 10％,glucose addition amount of 0.75％,the removal rate of aluminum nitride reaches 95.42％.Through analysis and characterization,it is determined that in the calcium oxide-glucose hydrolysis system,glucose acts as a retarder,which can inhibit the formation of calcium aluminate coating layer on the surface of aluminum nitride particles,make the hydrolysis of aluminum nitride thoroughly,and improve its removal rate.
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