Location:Home > Engineering science > Metallurgical Engineering > Non-ferrous metallurgy > Study on Recovery of Valuable Metals in Cobalt-bearing Converter Slag from Chambishi Copper Smelter
Details
Name

Study on Recovery of Valuable Metals in Cobalt-bearing Converter Slag from Chambishi Copper Smelter

Downloads: []
Author
Tutor: FengNaiXiang
School: Northeastern University
Course: Non-ferrous metallurgy
Keywords: cobalt-bearing converter slag,valuable metal,Cu-Co-Fe alloy,depletion,recovery
CLC: X758
Type: Master's thesis
Year:  2012
Facebook Google+ Email Gmail Evernote LinkedIn Twitter Addthis

not access Image Error Other errors

Abstract:
During the pyrometallurgy process of copper sulfide concentrate, associated cobalt in raw ore is usually beneficiated in converter slag, valuable metals (such as Cu and Co) in which can be extracted by further processing. A cobalt-bearing converter slag was obtained from Chambishi Copper Smelter in Zambia. The chemical composition and phase structure of the slag sample were analyzed. And then the preparations of Cu-Co-Fe alloys from the slag using direct reduction smelting process and pre-depletion-reduction smelting process were studied.From the results of chemical analysis, the chemical composition of the slag were Cu26.100%、Co0.516%、 Fe31.500%and SiO222.740%. And X-ray diffraction (XRD) analysis showed that the main phases of the slag were magnetite (Fe3O4), metal copper, quartz (SiO2) and a small quantity of fayalite (Fe2SiO4). It showed higher contents of copper and magnetite than that of common converter slag due to its production under overblowing conditions.(1) Direct reduction smelting processThe effects of reduction smelting parameters, including reductant (coke or pulverized coal) addition, slag modifier (CaO) addition, smelting temperature and time, on the recoveries of valuable metals and the beneficiation rate of cobalt were investigated. The viscosity-temperature curves of slag were measured; and the depletion slag and Cu-Co-Fe alloys were characterized by XRD, metallographic microscope (MM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Under the optimal conditions: CaO addition of5%, smelting temperature of1350℃and time of2.5h, the recoveries of Cu and Co reached93.32%and90.45%respectively, and the contents in the alloys were64.370%and1.640%respectively with coke addition of7.0%; In addition, the recoveries of Cu and Co reached92.58%and91.02%respectively, and the contents in the alloys were65.880%and1.670%respectively with pulverized coal addition of10.0%. (2) Pre-depletion for copper recoveryThe slag viscosity decreased as the reduction of Fe3O4in slag by reductant addition; and the layered performance can also improved with sulfurization agent addition. Therefore, copper recovery from the overblowing slag can be conducted by a pre-depletion process while most cobalt remains in the slag. The effects of reductant (coke or pulverized coal) addition, sulfurization agent addition, smelting temperature and time on the copper recovery were investigated. The viscosity-temperature curves of slag were measured; and the pre-depletion slag, alloys and matte were characterized by XRD, MM, SEM and EDS. With coke addition of1.0%or pulverized coal addition of2.5%, the copper recoveries was91.59%and90.54%respectively, Co recoveries was90.02%and97.32%respectively in the pre-depletion slag.(3) Reduction smelting process of pre-depletion slagThe reduction smelting of pre-depletion slag was conducted with coke or pulverized coal as reductant. The effects of reductant addition, slag modifier (CaO) addition, smelting temperature and time were investigated. The depletion slag and alloys were characterized by XRD, MM, SEM and EDS. Under the optimal conditions:CaO addition of6%, smelting temperature of1500℃and time of1.0h, the recoveries of Cu and Co were82.55%and92.83%respectively, and the contents in the alloys were7.340%and3.460%respectively with coke addition of4.0%; In addition, the recoveries of Cu and Co were84.66%和95.73%respectively, and the contents in the alloys were6.640%and3.230%respectively with pulverized coal addition of9.0%.
Related Dissertations
Last updated
Sponsored Links
Home |About Us| Contact Us| Feedback| Privacy | copyright | Back to top