Step 1: Aluminum ash raw materials are dispersed and gravity winnowed: The aluminum ash in the production process of electrolytic aluminum and recycled aluminum is dispersed at the feed port of the gravity separator through the metering and belt conveying system, and separated by gravity and wind. The coarse particles of aluminum ash and metal aluminum are sorted and discharged from the lower discharge port, and the medium and fine powder and fine particles are carried out by the air flow;
Step 2: Fine crushing and regrinding: After sorting the metal aluminum, the coarse-grained aluminum ash in step 1 is transported into the high-pressure roller grinding system for roller grinding. The materials after roller grinding enter the gravity air separation system again, and the coarse-grained aluminum ash is The ash returns to the high-pressure roller mill to form a closed loop;
Step 3: Separation of metal aluminum: The aluminum ash after being rolled by the high-pressure roller mill system in step 2 is sorted by a gravity air separator. The metal aluminum flakes are recovered from the medium-grained discharge port of the gravity air separator, and the fine particles are Grade aluminum ash enters the medium to fine powder dynamic separator with the wind;
Step 4: Recycling of medium and fine particles: Discharge the fine particles in step 3 from the upper part of the gravity wind separator, and transport them to the dynamic powder separator by wind. The discharge port of the dynamic separator collects and recovers the medium and fine aluminum ash. , recycle, store and reuse or return to the roller mill system depending on the application;
Step 5: Fine-grained denitrification: The fine-grained aluminum ash in step 4 is discharged from the dynamic powder separator and enters the aluminum ash denitrification reaction tower. The fine-grained aluminum ash enters the lower part of the denitrification reaction tower for denitrification treatment. The final aluminum ash is discharged from the upper part of the reaction tower;
Step 6: Recover fine-grained denitrification aluminum ash: The aluminum ash and steam discharged from the denitrification reaction tower enter the cyclone dust removal and settling chamber for dust collection. The fine-grained denitrification aluminum ash is recovered at the dust removal port, and the dust-containing gas enters the lower chamber. step processing;
Step 7: Pass the dusty gas in step 6 through the dust collector to complete gas-solid separation. The dust collector collects ultra-fine-grained denitrification aluminum ash. The dust-purified gas is sent by the fan to the aluminum plant or carbon plant for desulfurization and desulfurization. After comprehensive processing in the system, it is discharged.