During the reduction roasting, additive CaO reacted with Fe 2 SiO 4 of copper slag, forming CaO·SiO 2 and 2CaO·SiO 2, which ameliorates the separation between iron and …
In the current study, the selective reduction and magnetic separation technique was adopted to recover iron from copper slag. Calcium salts were used as an additive because studies reported that iron in the slag is difficult to reduce via the reduction method and it is mainly present in the form of Fe 2 SiO 4 in slag; that is why in order to enhance the recovery of iron from Fe 2 …
Copper slag is a solid waste during pyrometallurgical production of copper from copper sulphide concentrates, about 2.2 tonnes of which being generated per tonne of metal copper production. ... In order to recover iron from copper slag, the technology of carbothermic reduction and magnetic separation was developed. During the reduction roasting ...
After establishing the magnetic separation parameters for the magnetic separation tube, the calcine was ground to the appropriate particle size and introduced into the XCGS-50 Davis magnetic separation tube. ... Innovative methodology for comprehensive and harmless utilization of waste copper slag via selective reduction-magnetic separation ...
Approximately 80% of global copper production relies on pyrometallurgical processes, and mainstream techniques such as flotation (Stirbanovic et al., 2022; Liu et al., 2020), leaching (Muravyov et al., 2012; Kierczak and Hullebusch, 2016), and reduction magnetic separation (Yuan et al., 2020a, 2020b; Jiang et al., 2020) all use copper slag that ...
In summary, the Fe 3 O 4 and Fe 2 SiO 4 in the copper slag could be reduced to the metallic iron by coal-based direct reduction and recovered by magnetic separation. The best reduction conditions were those in which the reduction temperature was 1300 °C, the reduction time was 30 min, the dosage of coal addition was 35 wt.%, and the dosage of ...
Iron extraction from copper slag by additive-free activation …
Iron grain growth during deep reduction roasting is important for iron enrichment from copper slag (CS) through magnetic separation. In this work, a novel method of additive …
Direct reduction refers to the process of reducing iron minerals in copper slag to metallic iron particles below the melting temperature of copper slag [].Using direct reduction–magnetic separation technology to recover iron resources in copper slag has fair recovery effect and short reaction time, which is the development trend of comprehensive …
The beneficiation of copper slag employing gravity concentration and froth flotation, with particular emphasis on different collector systems, has been reviewed thoroughly. ... A novel process to upgrade the copper slag by direct reduction-magnetic separation with the addition of Na2CO3 and CaO. Powder Technol., 347 (2019), pp. 159-169. ISSN ...
Before doing dry magnetic separation, the waste copper slag reduced by the reduction reaction step was first crushed to a particle size of 75–104 μm in diameter. This is to liberate the iron-rich parts contained in the reduced waste copper slag from the remaining silicon-rich parts, as shown in Fig. 3 (b). And then, several dry magnetic ...
Therefore, concentrated solar power (CSP) could be used in the treatment of copper slag to transform fayalite into magnetite and copper sulfides and oxides into copper nodules. This is the objective of this paper. The results …
This is helpful for the magnetic separation of iron and silicon. The thermodynamic and experimental results were preliminarily confirmed to be available in the innovative process. ... Guo Z., Xu J., Chou J. A novel process to upgrade the copper slag by direct reduction-magnetic separation with the addition of Na 2 CO 3 and CaO. Powder Technol ...
An innovative technology for direct reduction-magnetic separation with the addition of Na 2 CO 3 and CaO was studied to upgrade copper slag assaying 40.33% Fe total and 0.65% Cu.
Copper smelting slag (CSS) is a by-product of modern copper production. In this study, iron resources were extracted from copper smelting slag using chlorine roasting and magnetic separation techniques for the first time.
Basic tests and pilot scale plant tests have been conducted on the discarded copper slag from a Chinese copper smelting plant, by adopting a direct reduction in a RHF and …
The reductively roasted copper slag with mean particle size of 4.76 μm was separated at different magnetic intensities.The results are shown in Fig. 1b. The Fe recovery, SiO 2 content, and SiO 2 recovery in the concentrate increase with magnetic intensity, whereas the Fe content shows a decreasing trend. The independent metallic iron particles in reductively …
The precipitation of Fe 3 O 4 particles and the accompanied formation of Fe 3 O 4-wrapped copper structure are the main obstacles to copper recovery from the molten slag during the pyrometallurgical smelting of copper concentrates.Herein, the commercial powdery pyrite or anthracite is replaced with pyrite–anthracite pellets as the reductants to remove a …
In conclusion, we elucidate that this copper slag is a viable source of iron, which can be extracted and used as feed material in other processes. It can be concluded that iron …
Cu–Co–Fe matte obtained from copper converter slag by reductive-sulfidizing smelting was treated by magnetic separation-sulphuric acid leaching (MS-SAL) process to recover the metal values, copper and cobalt. ... As part of copper and iron remained in tailings during the magnetic separation and the copper in concentrate was almost not ...
Under the optimum conditions, 90.7 % of the copper in the CSS was effectively leached, other copper in the leaching slag mainly existed in the form of fine-grained embedded copper sulfide. The dominant phase of the leaching slag is magnetite, which could be further recovered by conventional magnetic separation.
Using the developed process, a magnetic product containing more than 65 wt.% iron was obtained from magnetic separation under a magnetic field strength of 0.03 T for the waste copper slag treated ...
However, the iron concentrate obtained through magnetic separation contains copper and cannot be directly used as raw ironmaking materials ... Characterization and recovery of copper from converter copper slag via smelting separation. Metall. Mater. Trans. B, 49 (5) (2018), pp. 2458-2468, 10.1007/s11663-018-1364-y.
The roasting-magnetic separation process is the route to convert the metals into a desired phase, which can be easily separated from the slag through mixing copper slag with calcium oxide as ...
Direct reduction of Fe 2 SiO 4 using reducing agents, followed by magnetic separation, is a typical pyrometallurgical process for iron recovery from copper slag and has attracted significant ...
Steel slag and reduced sample were ground in a vibration mill, and then metallic iron was removed through magnetic separation. The remaining powders, copper slag, and chlorinated sample were made into powder in a ball mill for chemical and phase composition analysis. Their chemical compositions were determined using an X-ray fluorescence ...
Attempts to economically and effectively treat copper slag (CS) and ferruginous manganese ore(FMO) using the traditional direct reduction–magnetic separation process have faced many challenges, such as low levels of metal recovery, poor cost-effectiveness and the need for a high proportion of additives.
Synergetic utilization of copper slag and ferruginous manganese ore via co-reduction followed by magnetic separation process J. Clean. Prod., 250 ( 2020 ), Article 119462, 10.1016/j.jclepro.2019.119462
Copper slag is a solid waste that has to be treated for metals recovery. In order to recover iron from copper slag, the technology of carbothermic reduction and magnetic separation was developed.
Various studies have been conducted to recover copper and cobalt using magnetic separation and sulfuric acid leaching of copper slag containing Cu–Co–Fe. The sample was subjected to wet grinding to allow magnetic separation, producing 95.75% cobalt, while 87.8% of copper and 44.39% of iron remained in the tailings [ 12 ].
Zeng and Xiao proposed a physical beneficiation method combining direct flotation with three times magnetic separation to recover copper and iron from copper slag. Under this condition, iron-bearing concentrate with an iron …
The presence of magnetic inert minerals (RO phase, Fe 3 O 4, Fe) in steel slag powder 13 enables the separation of these minerals from the slag to enhance its gelling properties and facilitate iron resource recovery, thereby improving the activity of steel slag powder. 14 However, during wet magnetic separation operations, hydrated active minerals, such as C 2 S, …