A study on the structural analysis of aluminium drosses and processing of industrial aluminium salty slags

Abstract

In aluminium‐melting operations, a dross layer containing 85% metallic Al forms on the surface of the molten aluminium bath. Therefore, a significant amount of metal is removed from the furnace with the dross. Melt losses are one of the most important economical points in the melting operations. In the first part of the present study, a series of reverbaratory furnace drosses received from several aluminium plants located in Turkey were examined to determine their compositional and structural characteristics. Following crushing and grinding operations, drosses were dimensionally classified into 5 groups. Metallic Al, Mg, Zn, Fe and SiO2 contents of each group were analyzed separately. The metallic aluminium content of the group +4 mm is found to be approximately 75% while that of −0.5 mm group is 25%. Another fundamental finding is the high Mg content present in the drosses. Furthermore, Fe and SiO2 contents increase with decreasing particle size of the dross. In the second part of the investigation, experiments were carried out on the treatment of the salty slags to obtain salt, aluminium and non‐metallic products which can be used for various purposes. Leaching and crystallization in an evaporator is employed to determine the optimum conditions for the recovery of flux from the salty slag.

Recycling of aluminum dross for producing calcinated alumina by microwave plasma

“…When the aluminum nitride in aluminum dross reacts with water vapor in rain or the air, ammonia odor is generated and emitted, thereby causing air pollution [12,13]. Flammable gases, such as hydrogen and methane, are also released [14]. Moreover, when the aluminum dross contains hazardous heavy metals, such as chromium, copper, lead, cadmium, mercury, barium, arsenic, and selenium, rainfall could wash these hazardous materials present in the aluminum dross into the soil, which leads to soil or water pollution.…”

“…Moreover, when the aluminum dross contains hazardous heavy metals, such as chromium, copper, lead, cadmium, mercury, barium, arsenic, and selenium, rainfall could wash these hazardous materials present in the aluminum dross into the soil, which leads to soil or water pollution. Skin irritation and pulmonary disease could also be induced or aggravated [14]. Inhaling the SAD particles suspended in the air may induce serious Alzheimer's disease, silicosis, and bronchitis [8].…”

Sustainable Management of Salt Slag

“…Most of the processes described for the treatment of salt slag consist of milling and sieving of the as-obtained salt slag to recover metallic aluminum [22][23][24][25]. The rejected finest fraction is then subjected to a leaching process to dissolve and recover the salt content [17,26,27].…”

Evaluation of morphological, rheological, mechanical, and dielectric properties of aluminum dross filled polyoxymethylene (POM) composites

“…[ 5–7 ] In both production methods, oxidation occurs on the surface of the melt‐state Al due to high temperature, and aluminum dross (Al‐dross), composed mainly of Al 2 O 3 , is formed. [ 8–11 ] Besides metallic Al and Al 2 O 3 , Al‐dross includes different inorganic compounds such as magnesium spinel (MgAl 4 ), magnesium oxide (MgO), SiO 2 , AlN, aluminum carbide, and aluminum nitride components at much smaller ratios. [ 12 ] Sodium chloride is also added to the melting pot to minimize the amount of Al‐dross released during aluminum production.…”