Abstract
A process consisting of ball milling followed by NaOH leaching was developed to selectively dissolve alumina from black dross. From the ball milling treatment, it was found that milling speed greatly affected the leaching behavior of silica and the oxides of Ca, Fe, Mg, and Ti present in dross. The leaching behavior of the mechanically activated dross was investigated by varying NaOH concentration, leaching temperature and time, and pulp density. In most of the leaching conditions, only alumina and silica were dissolved, while the leaching percentage of other oxides was negligible. The leaching percentage of silica decreased rapidly to nearly zero as pulp density increased to 100 g/L. At the optimum leaching conditions (5 M NaOH, 50 °C, 2 h, pulp density of 100 g/L), the purity of Al in the leaching solution was higher than 98%, but the leaching percentage of alumina was only 35%.
Highlights
IntroductionAluminum metals are produced from ores such as bauxite and other secondary resources [1]
Aluminum is lightweight, high specific strength, and high corrosion resistance
In order to recover pure alumina from black dross, a process consisting of ball milling treatment followed by NaOH leaching was developed
Summary
Aluminum metals are produced from ores such as bauxite and other secondary resources [1]. Of energy can be saved by recycling secondary resources instead of producing Al metal from ores [2]. Aluminum dross is produced by treating secondary resources containing Al metal. This dross consists of a mixture of free Al metal and nonmetallic substances such as aluminum oxide, nitride, carbide, salts, metal oxides, and other elements [3]. The small amount of Al metal present in dross is recovered and black dross results from this treatment. Some Al metal and oxides of several metals are still present in black dross. The recovery of valuable components in black dross is important in light of environmental concerns
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