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A review on the recovery of copper from waste copper slag. • Discussion on physical beneficiation, pyro- and hydrometallurgical routes. • Critical aspects of froth flotation discussed. • Flowsheet for copper recovery from copper slag proposed.
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Copper smelting slag contains 1%âˆ'4% Zn and 0.2%âˆ'0.6% Pb [10]. However, it is difficult to recover Zn and Pb from copper smelting slag by traditional metallurgical processes because the slag has a stable structure and complicated multi- component system [11,12].
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A maximum recovery of more than 90% copper re- quired a roasting temperature of 900 and quantities of CaC1E-2H20 and coke 10 wt.% and 5 wt.% respectively. For treatment of the dump copper slags by segregation roasting it is necessary to use calcium chloride as the chloridiz- ing agent.
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Ladle furnace slag is used to treat heavy-metal-containing tannery sludge (Pantazopoulou and Zouboulis, 2018), ... which limits this application. Wet desulfurization is not conducive to recovering the thermal energy from the ladle furnace slag. Therefore, the development of an efficient high-temperature method to remove S from hot ladle furnace ...
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The slags produced from the NCS furnaces (TSL furnace, copper converter, reverberatory furnace) contain copper ranging between 0.8 to 5% w/w. Due to this high content of copper, the slags are milled and floated to recover the copper. The main drawback in the current process is that the final flotation tailings grades are in …
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Duan et al. proposed a multi-stage blast furnace slag waste recovery system for effective recovery of the waste heat of blast furnace slag and they evaluated the environmental and economic impacts of the proposed method in comparison with OCP (water quenching-open circuit process and DSG (dry slag granulation) methods.
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The results show that the residual iron concentration of the quenched glass is less than 1.43 mass% and Fe concentration in recovery of copper slag is more than 96.6 mass%, highlighting that the ...
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In this work extraction of copper and iron from a reverberatory furnace slag was studied. A two-step extraction procedure was followed. The first step was roasting of the slag in the presence of ...
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A comparison of the two tables shows no significant difference in results obtained from slags cooled in air or in the induction furnace. Recovery of copper in concentrates from slags cooled in the induction furnace and ground for 30 minutes ranged from 87.1 to 96.2 percent with the best recovery obtained on the highest grade slag sample.
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Converter copper slag can be viewed as an important secondary resource for valuable metals, considering its high commercial value. The current research investigates the recycling of copper by a combination of theoretical and experimental methods. Based on a modified Stokes equation, it was determined that copper droplets in the molten …
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Recovery of copper in concentrates from slags cooled in the induction furnace and ground for 30 minutes ranged from 87.1 to 96.2 percent with the best recovery obtained on the highest grade slag …
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The maximum recovery of copper in alloy phase was obtained with 5% (by weight) initial carbon in the feed, 2% (by weight) CaO addition to the slag and a reducing temperature of 1573 K. A higher ...
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Methods for metal recovery from copper slagA number of methods for metal recovery from copper slag were reported. Basically, they can be classified into three categories, namely flotation, leaching and roasting. Barnes et al. (1993) described an industrial flotation process of the copper slag at Mount Isa Mines Limited. The slag is …
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Fig. 1 displays XRD patterns for the copper slag, steel slag, chlorinated sample, and reduced sample. The copper slag mainly comprises fayalite (Fe 2 SiO 4), ferrous oxide (FeO) and magnetite (Fe 3 O 4); the steel slag is mainly composed of dicalcium silicate (Ca 2 SiO 4), tricalcium silicate (Ca 3 SiO 5) and calcium ferrite (Ca 2 …
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Slag cleaning is important from both an economical and environmental perspective. Dump slags from copper smelting prove to be a valuable source of base metals, but the abundance of iron in the ...
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Three homogenized samples were obtained from a reverberatory furnace slag, top submerged lance (TSL) slag and a converter slag, respectively. Laboratory tests were then carried out on these samples as well as on the combined slag, with the aim of recovering copper minerals. 2.2.
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Abstract. The recovery of copper from reverberatory furnace slag utilizing flotation has been studied. The effective factors such as particle size, pH, the amount and type of collector and ...
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The metals in smelting and converting slags are present either dissolved, present mostly as ions (e.g., for copper slag as Cu + ions) or as entrained droplets of matte. The dissolved metals is associated either with O X− ions (i.e., Cu 2 O) or with S X− ions (e.g., Cu 2 S). Electric slag-cleaning furnace uses coke as a reductant.
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During ISA copper smelting process, ISASMELT furnace discharges a large amount of matte and slag mixture and the separation of them has an important influence on the recovery of valuable metals. This paper presented a reduction-sulfurization sedimentation process for recovering copper and cobalt from the matte–slag mixture of …
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The residual aluminum in secondary copper feed entering the furnace will have an influence on the slag properties and, therefore, on the success of the entire copper smelting process. The black copper smelting process includes reduction and oxidization smelting stages carried out in either order at the same furnace or consecutive furnaces, …
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This paper firstly reviews the main methods for the recovery of valuable metals from copper slag, such as beneficiation method, pyrometallurgical approach, and …
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White Pine reverberatory furnace slags contained economically recoverable amounts of copper for a variety of reasons. Among them: White Pine concentrates yield …
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Full size image. The copper content of copper slag is 0.5–4.5% or even higher, which is much higher than the 0.2–0.3% mining grade of copper mines in China. The total iron content in copper slag is about 40%, which is significantly higher than the mineable grade of iron ore in China (TFe > 27%) [ 10 ].
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The recovery of copper and cobalt from ancient copper slags from the Küre region of T urkey was investigated. A fayalitic-type of ancient copper slag containing 1.24% Cu, 0.53% Co and 53.16% Fe ...
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The function of the blast furnace is to economically smelt miscellaneous residues, e.g., slags and copper, utilizing low energy while minimizing metal loss to the final slag …
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The temperature of copper slag derived from furnaces is >1300 °C, indicating the potential for recovering a large amount of potential energy. Combined waste heat and metal recovery can be adopted ...
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Slags are valuable by-products of iron- and steelmaking processes. Their efficient reutilization and the recuperation of their thermal energy are key for improving the overall efficiency of these processes. With the innovative approach presented in this work, it is possible to recover thermal heat from liquid slags. The process concept consists of a …
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Composition: Compared with blast-furnace slag, copper slag contains large amounts of iron, copper, and other metals. ... The amount of energy absorbed by the reaction and the rate at which the energy is absorbed during the waste heat recovery directly affect the equipment design, which must also be addressed. 4. Copper slag as …
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The use of an electric arc furnace for recovery of metal values from slag generated in a secondary copper smelter has been successfully demonstrated and commercialized. Blast furnace slag containing about 1.5% Cu, 1.0% Pb, 3.5% Zn, 1.0% Ni, 40% FeO and 1.0 opt Ag was retreated to recover better than 75% of the metal values. The addition of ...
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The reverberatory slag is produced from the reverberatory smelting furnace and usually produces the slag that is more dilute in copper of about 0.6% and is discarded without slag recovery treatment (Davenport et al., 2002). The smelter slag is produced from the smelting furnaces and contains copper with average of 1.2%.
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