Characterisation of aluminium black dross before and after stepwise salt-phase dissolution in non-aqueous solvents

Abstract

Highlights• The glycerol pre-treatment method is an effective way to assist in determining minor reactive phases.• The problematic mineral phases associated with AlN could be easily identified after pretreatment.• The existence of amorphous or turbostratic graphitic carbon in black dross has been confirmed.• The FT-IR allowed the successful identification of Al4C3 presence in industrial samples of black dross.

An alternative to cyanide leaching of waste activated carbon ash for gold and silver recovery via synergistic dual-lixiviant treatment

“…The concept of "green mining" has emerged in recent years as a powerful rationale for the adoption of industrial technologies and processes that minimise environmental impact and contribute to decarbonisation [7] Thus, there is a growing pressure on companies and institutions to reject precious metals produced from environmentally and socially destructive mining [8,9]. There is a concurrent increasing interest in secondary metal resources and reprocessing, with wasteforms such as metallurgical slags [10] and dross [11] receiving recent attention from researchers. This focus has clear benefits, as part of an overall shift to a circular economy.…”

Valorization of Al slag in the production of green ceramic tiles: Effect of experimental conditions on microstructure and crystalline phase composition

“…Nevertheless, the energy demand of the process is still high, which results in the use of alternative methods such as the production of aluminum through a recycling process. 3 Secondary production is the process of transforming remains and aluminum scrap (shavings, trimmings, devices, etc) into aluminum metal. It is an environmentally friendly process that is much more energy-efficient than primary production since it cuts out more than 90% of the energy that would be required to produce an equivalent quantity of aluminum from bauxite ores.…”

“…In recent years, the energy consumption for primary aluminum manufacture has been substantially reduced owing to both technological advances and the use of renewable hydroelectric energy. Nevertheless, the energy demand of the process is still high, which results in the use of alternative methods such as the production of aluminum through a recycling process 3 …”

Effects of Different CaO/Al2O3 Ratios on the Phase Composition and Desulfurization Ability of CaO-Based Desulfurizers in Hot Metal

“…However, aluminum dross, which is composed of Al 2 O 3 , aluminum nitride (AlN), a small amount of aluminum (Al), and a small amount of aluminum carbide (Al 4 C 3 ), is listed as hazardous waste in the EU, and most of it goes directly to landfills without treatment [18,19]. Aluminum will react with water, resulting in ammonia (NH 3 ), flammable gases (hydrogen (H 2 ), and methane (CH 4 )) [20,21], thereby causing stinky burning and serious harm to groundwater and ecosystems [22][23][24]. According to the studies of C. Y. Lin, F. H. Lu, and Z. Su et al [25,26], the AlN in AD will transfer to Al 2 O 3 when the temperature is higher than 1000 • C. Hence, many studies have investigated sintered calcium aluminate from aluminum dross [26][27][28].…”