| 1. |
- Menad, Nourreddine, et al.
(författare)
-
Study of the presence of fluorine in the recycled fractions during carbothermal treatment of EAF dust
- 2003
-
Ingår i: Waste Management. - 0956-053X .- 1879-2456. ; 23:6, s. 483-491
-
Tidskriftsartikel (refereegranskat)abstract
- Carbothermal treatment tests of electric arc furnace dusts (EAFD) using the Waelz kiln process were carried out in pilot-scale for the production of zinc oxide. The association of halides in the EAFD, and the recycled products, such as zinc oxide fumes and high-grade iron contents fractions were examined by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) analysis. XRD reveals the presence of chlorine and fluorine in the dusts in the form of KCl, NaCl and CaF2. An ultra-pure fraction of zinc was obtained after the Double Leaching Waelz Oxide (DLWO) process was performed on the zinc oxide fumes. The halide contents were reduced to approximately 100 ppm Cl and 700 ppm F. The rest of these elements are in the form of CaF2. About 65% F is volatilised as lead and zinc fluorides, 15% is expected in the magnetic fractions and 20% in non-magnetic fractions as CaF2 and MnF2, respectively.
|
|
| 2. |
- Menad, Nourreddine, et al.
(författare)
-
Thermal treatment of dusts from non ferrous metallurgical industries
- 2000
-
Ingår i: Revista de metalurgia. - : Editorial CSIC. - 0034-8570 .- 1988-4222. ; 36:3, s. 159-164
-
Tidskriftsartikel (refereegranskat)abstract
- Three samples of dusts generated by the non ferrous metallurgical industries are treated between 200 and 800 °C in controlled oxidizing and reducing atmospheres. The objective of this study is to recover the valuable metals from these wastes. The treatments of these solids under oxidizing conditions at 700° are well adapted for two samples. The totality of valuable elements are concentrated in the treatments' residues. The use of hydrogen at 600° C, permits the removal of up to 100% of valuable metals contained in the treated industrial wastes. The recovery rate of valuable metals (Pb, Zn, Cu) as well as the Global Decontamination Factor are reported.
|
|
