Cyclones and fabric filters dusts from secondary aluminium flue gases: a characterization and leaching study

Abstract

The present work aims at the characterization and leachability examination of aluminium dusts, generated during the secondary aluminium production from scrap. Two different types of dusts were examined: a cyclone aluminium dust and a fabric filter aluminium dust, derived from the waste gases de-dusting system, produced during the Al scrap meltdown. The characterization of both dusts was carried out using particle size distribution analysis, chemical analysis, X-ray diffraction and thermogravimetric/differential thermal analyses. Their microstructure and morphological characteristics were examined by scanning electron microscopy and transmission electron microscopy. The results showed that the basis of the examined dusts was different, as they consisted of different mixtures of metallic aluminium, salt flux constituents, aluminium oxide and aluminium nitrides. Their behaviour during leaching was determined by the toxicity characteristic leaching procedure test and the EN 12457-2 compliance leaching test. The results revealed that both dusts should be treated as hazardous wastes and in case of landfilling they should be disposed of at appropriate, regulation-prescribed waste dumps, after removing the watersoluble phases, such as chlorides or nitrides.

Application of Industrial Wastes from Chemically Treated Aluminum Saline Slags as Adsorbents

“…These two equations have been employed to explain the adsorption of aqueous pollutants on adsorbents. ,− …”

Substantiation of choosing the design of a reactor­dust collector with two colliding flows

“…The analysis of the conducted studies showed that stable operation of the reactor can occur at a maximum Δ value of not more than 1.2¸1.5, that is, at a dust concentration in the gas-dispersed flow, which does not exceed 1.0 kg/nm 3 . As we know, the dust content in the gas flow, which enters purification, should not exceed 0.2¸0.4 kg/nm 3 for modern cyclone constructions [15].…”

Development of a highly efficient combined apparatus (a combination of vortex chambers with a bin) for dry dedusting of gases

“…The study [17] focused on dust characteristics. This work has more fully described and complemented the issue solution with the study of physicochemical characteristics of dusts like it was considered in [6].…”

“…This work has more fully described and complemented the issue solution with the study of physicochemical characteristics of dusts like it was considered in [6]. Two different types of dust were studied in [17]: cyclone aluminum dust and aluminum dust. Dust characterization was performed using analysis of particle size distribution, chemical analysis, X-ray diffraction and differential thermal analysis.…”