In order to achieve single recovery of Fe, Cu and Si in copper slag and deep removal of impurities in products, the activated reduction combining directional oxidation are adopted to improve the separation limit of target components, which mineral constituent as well as chemical composition at different stages are investigated through XRD and chemical analysis. …
Abstract The response characteristics of iron smelting reduction of copper slags were studied in this paper. With the molten slag basicity of 1·4, the γ (FeO) takes nearly a maximum value equalling to 4·27. The diffusion of (FeO) through the molten slag boundary layer to the molten slag–iron interface is found to be the rate-limiting step for the process of (FeO) …
Herein, the copper slag through CaO-thermal treatment was used as a heterogeneous catalyst to activate H 2 O 2 into free radicals to remove NO x and SO 2.The NO x removal capacity of modified copper slag exhibited a volcano-type tendency with increased calcination temperatures. Because of the iron phase transformation and decrease in surface …
According to the mechanism of sulfur removal easily through oxidation, the process of smelting oxidation desulfurization of copper slags is studied, which supplies a new thinking for obtaining the molten iron of lower sulfur content by smelting reduction of copper slags. Special attention is given to the effects of the holding temperature, the holding time and CaF 2, CaO …
A new process is proposed for recovering copper from smelting slag using waste cooking oil as a green reductant. ... Smelting oxidation desulfurization of copper slags. J Iron Steel Res Int 19(12):14–20. Article CAS Google Scholar Guo Z, Zhu D, Pan J, Wu T, Zhang F (2016) Improving beneficiation of copper and iron from copper slag by ...
The removal of sulfur from copper slag can produce copper slag with low sulfur content. The use of air, oxygen, and other oxidants because of the strong oxida-tion can achieve the rapid removal of sulfur from slag [11, 12]. Despite the good desulfurization effect, it will also lead to the problem of slag overoxidation [13].
A large amount of copper smelting slag (CSS) containing valuable elements such as copper and iron is produced through smelting. ... Mao et al. (2021) proposed a two-step process of oxidative desulfurization and smelting reduction of CSS treated with waste cathode carbon. Waste cathode carbon could be used not only as reducing agent, but also as ...
Secondary copper smelting is an effective means of treating waste resources. During the smelting process, the viscous behavior of the smelting slags is essential for smooth operation. Therefore, the effects of Fe/SiO2 ratio and Fe2O3 contents on the viscous behavior of the FeO−Fe2O3−SiO2−8 wt%CaO−3 wt%MgO−3 wt%Al2O3 slag system were investigated. The …
According to the mechanism of sulfur removal easily through oxidation, the process of smelting oxidation desulfurization of copper slags is studied, which supplies a new thinking for obtaining …
Copper smelting slags are difficult to achieve harmlessness and reduction because of the presence of abundant of fayalite (Fe 2 SiO 4).This work proposed a novel strategy for harmlessness and reduction of copper smelting slags by alkali disaggregation of Fe 2 SiO 4 coupling with acid leaching. The disaggregation changed the Fe 2 SiO 4 phase by NaOH and …
According to the mechanism of sulfur removal easily through oxidation, the process of smelting oxidation desulfurization of copper slags is studied, which supplies a new thinking for obtaining the ...
However, unlike the manganese smelting and magnesium oxide manufacturing industries, there are few studies on the desulfurization about copper smelting. Therefore, it is important to develop an efficient flue gas desulfurization method for the copper smelting industry. ... Copper slag as a catalyst for mercury oxidation in coal combustion flue ...
In this study, to improve the flue gas desulfurization performance and the utilization of copper tailings, SO2 removal from smelting flue gas by using copper tailings combined with MnSO4·H2O was ...
In the reduction smelting process of copper slag, sulfur content is an important factor affecting metal recovery. In the thermodynamic calculation under ideal conditions, the increase in S content is beneficial to the recovery …
The results mdicate that the rate of copper slags smelting oxidation desulfurization depends on the matte mass transfer rate through the slag phase After the oxidation treatment, sulfur of copper ...
Complete removal of phenol was achieved within 30 min in the copper slag/H 2 O 2 /UV system, whereas the same result was obtained in the copper slag/H 2 O 2 system within 90 min. Copper slag/UV and H 2 O 2 /UV were used as controls to be determine that UV interaction with copper slag or H 2 O 2 did not enhance phenol oxidation. In the copper ...
The slag phase is made up primarily of FeO, Fe 3 O 4, and SiO 2 with trace quantities of copper and is considered as waste in the copper smelting process. The matte phase (copper percent by weight) is primarily made up of Cu 2 S and FeS [9]. Then matte and slag are tapped out through the holes located at the side of the setter. A comprehensive ...
According to the mechanism of sulfur removal easily through oxidation, the process of smelting oxidation desulfurization of copper slags is studied, which supplies a new thinking for obtaining the ...
According to the mechanism of sulfur removal easily through oxidation, the process of smelting oxidation desulfurization of copper slags is studied, which supplies a new thinking …
uses is for molten steel de-oxidation process. The production of ferro-silico-manganese alloy uses man- ... copper smelting slag used in this study was supplied by PT. Smelting, Gresik, East Java ...
The results mdicate that the rate of copper slags smelting oxidation desulfurization depends on the matte mass transfer rate through the slag phase After the oxidation treatment, sulfur of copper slags can be removed as SO2 efficiently.
According to the mechanism of sulfur removal easily through oxidation, the process of smelting oxidation desulfurization of copper slags is studied, which supplies a new thinking for obtaining the ...
In this study, the thermodynamics of sulfur oxidation and decomposition were calculated by Factsage to evaluate the feasibility of sulfur removal from copper slag during the …
In order to reasonably utilize the iron resources of copper slags, the smelting chlorination process was used to remove copper from copper slags. Higher holding temperature and O2 flow rate are beneficial to increasing copper removal rate. However, the Cu2O mode is formed by the reaction of surplus O2 and CuCl with O2 flow rate increasing over 0.4 L/min, …
We study the oxidative desulfurization of copper slag at temperatures ranging from 1250 °C to 1450 °C using experimental copper slag as raw material. This is significantly different from the oxidative desulfurization process of low sulfur slag (wS < 0.2 pct) at temperatures > 1500 °C compared with the literature. Based on thermodynamic equilibrium calculation and an …
The high desulfurization capacity has been obtained in the wet process when using industrial waste solids as novel ... with the achieving the goal of resource reuse [16], [17]. Owing to a liquid-phase catalytic oxidation effect on the oxidation of S (IV) ... Copper smelting slag and gypsum residue are by-products in copper making processes, and ...
The copper slag oxidation roasting is a gas–solid reaction; the sulfur was adsorbed and consolidated by the CaO coating layer when sulfur oxide gas volatilized. ... Chen L., Ma F. Recovery status of copper recovery by flotation from copper smelting slag. Compr. Util. Miner. Resour. 2017; 1:16–20. [Google ... Chen Q.-Z., Zhu R., Wu J.-D ...
Keywords Desulfurization Copper-iron Calcium oxide Calcium carbide Ferromanganese Introduction With the development of copper smelting process, strong oxidation process is put into practice. Copper matte grade is higher, and copper element in smelting slag is also higher [1]. At present, the most common use of copper slag is that copper slag ...
According to the mechanism of sulfur removal easily through oxidation, the process of smelting oxidation desulfurization of copper slags is studied, which supplies a new thinking …
Desulfurization rate of oxidation furnace reached 99.5%. The ... smelting process. Since 1976, this process has been widely used for copper and nickel smelting in the former Soviet Union. China has conducted the improvement ... reacts strongly with oxygen to form lead alloy and slag. The heat required in the smelting process comes from the ...
the rate of copper slags smelting oxidation desulfurization depends on the matte mass transfer rate through the slag phase. After the oxidation treatment, sulfur of copper slags can be removed as S0 2 efficiently. Amount of CaZ+ of copper slags affects the desulfurization rate greatly, and the slag desulfurization rate is reduced by adding a ...
Li et al. studied the process the smelting oxidation-reduction process of copper slags with air blowing. And results show that the sulfur content can be reduced from 0.52 wt.% to less than 0.01 wt.% with this method. ... Li L., Hu J.H., Wang H. Smelting oxidation desulfurization of copper slags. J. Iron Steel Res. Int. 2012; 19:14–20. doi: 10 ...
In the experiment of desulfurization, the copper slag (150.0 g) was placed in the weighed alumina crucible (φ40 mm × 90 mm). ... the sulfur in slag was oxidized as SO 2 and the oxidation of slag ... George-Kennedy DP, Hayes PC, Jak E (2010) Investigation of liquidus temperatures and phase equilibria of copper smelting slags in the FeO-Fe 2 O ...
A recovery ratio of 97.47% Cu in the copper phase was obtained at a lower temperature and shorter duration compared to the pyrometallurgy methods. Wang et al. [104, 105] also attempted to separate fine copper droplets from copper matte smelting slag by utilizing super-gravity. The investigation resulted in a cleaner approach to efficiently ...
Copper smelting slag usually contains 1–6 wt% copper, which can be recovered by pyrometallurgical and flotation processes. However, the tailing slags still consist of 0.3–0.7 wt% Cu and 35–45 wt% Fe equivalents to those in the copper and iron ores, respectively. Most of the research was focused on the recovery of iron from the tailing slags. Copper can increase the …
Yun Wang also pointed out the influence of sulfur content on reducing Ni-containing slag in previous research [20,21] and put forward the idea of oxidation desulfurization and reduction for copper recovery . Previous studies have also tried to remove sulfur from copper slag by oxidation . Although the oxidative desulfurization process will ...