Method for co-processing secondary aluminum ash with converter slag

By synergistically treating the secondary aluminum ash with the converter steel slag, the FeO and MnO in the high-temperature converter steel slag eliminate the AlN reactivity in the secondary aluminum ash, and by adding expanded graphite as a catalyst and reducing agent, the steel slag conditioning reaction is optimized, and the harmless conversion of the secondary aluminum ash is achieved, solving the problem of secondary aluminum ash treatment in the prior art and the problem of insufficient resource utilization of the converter steel slag, achieving low-cost, safe and efficient treatment effect.

CN116356088BActive Publication Date: 2025-03-25CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Patent Information

Application Number
CN202310356234.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-06
Publication Date
2025-03-25
Estimated Expiration
2043-04-06

AI Technical Summary

Technical Problem

The prior art lacks effective methods to treat secondary aluminum ash from hazardous waste generated in the aluminum industry, and the resource utilization of converter steel slag has not yet been coordinated with secondary aluminum ash.

Method used

By synergistically treating the secondary aluminum ash with the converter steel slag, the AlN reactivity in the secondary aluminum ash is eliminated by using FeO and MnO in the high-temperature converter steel slag, and by adding expanded graphite as a catalyst and reducing agent, the steel slag conditioning reaction is optimized to achieve harmless conversion of the secondary aluminum ash.

Benefits of technology

The low-cost and harmless treatment of secondary aluminum ash is achieved, the performance of converter steel slag is optimized, the safety and efficiency of steel slag resource utilization is improved, and the carbon emissions of the metallurgical industry are reduced.

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Abstract

The invention discloses a method for co-processing secondary aluminum ash with converter steel slag. The method comprises the following steps: preparing secondary aluminum ash generated by an electrolytic aluminum enterprise, processing the tundish waste slag of a continuous casting machine generated by a steelmaking plant to a size below 1 mm, and purchasing expanded graphite with a particle size of less than 1 mm; uniformly mixing the secondary aluminum ash and the tundish waste slag of the continuous casting machine according to a mass percentage of 80:20 to form a mixture, adding expanded graphite in an amount of 3% to 5% of the mass of the mixture, using a high-pressure dry powder pelletizing machine to press the mixture after adding the expanded graphite into pellets with a diameter of 30 to 50 mm, and transporting the pellets to a converter production line and a hot smoldering slag production line for standby use; when pouring the furnace and slag before tapping the converter, the pellets are used as slag pressing and defoaming agents for a slag pot, are added to the slag pot along with the converter slag flow, and are added in an amount of 100 kg to 200 kg per ton of slag; or the pellets are added to a slag pot filled with converter liquid steel slag, and are processed according to a normal hot slag pouring or hot smoldering process.
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