Abstract. Copper slag (CS) and cement by-pass dust (CBPD) are by-products of the production of copper and cement, respectively. In the Sultanate of Oman, large quantities of copper slag (60,000 tons/year) and cement by-pass dust (25,000 tons/year) are produced every year, most of which is not effectively utilized and …
The Fe3O4 and Fe2SiO4 in copper slag were successfully reduced to metallic iron by coal-based direct reduction. Under the best reduction conditions of 1300 °C reduction temperature, 30 min reduction time, 35 wt.% coal dosage, and 20 wt.% CaO dosage (0.75 binary basicity), the Fe grade of obtained iron concentration achieved …
Copper slag is a residue from the copper smelting process that not only takes up large amounts of space, but also contains harmful elements that can cause environmental pollution. In this paper, zinc in copper slag is sulfide-roasted using pyrite as a vulcanizing agent and anthracite and K2CO3 as additives, thus leaving zinc in the slag …
Cement kiln dust (CKD) can be defined as a particulate material consisting of raw material, clinker entrained particles, and some calcined raw materials collected from the exhaust gases of ...
This paper provides a thermodynamic analysis of the copper flash smelting process which was done based on calculation with the FactSage thermodynamic …
Cement kiln dust (CKD), a fine powdered material, is one of the byproducts collected from exhaust gases emitted during PC production. According to Portland cement association (PCA) survey in 2006 ...
This fraction is significant because it affects heavily on the copper recovery during the slag cleaning phase. Basically, the fraction of oxide copper is dependent on the amount of sulfur present, which was kept fixed at 0.9%. The higher the oxidation degree and thus the copper content in slag, the higher the oxidized copper content as a ...
Higher copper slag (13.5%) replacement for cement resulted in adverse effects on concrete strength. This is expected since copper slag has a low free lime …
UCS test was done on soil–copper slag–fly ash mix and soil–copper slag–cement kiln dust mixes on 0, 7, 14, 28 days of curing to study strength development which occurs over ages. ... 4.3.1 Effect on Compaction. When cement kiln dust was added to soil–copper slag mix at 4% increments, OMC decreased and MDD increased. …
This study aimed to investigate the environmental impact of modified granulated copper slag (MGCS) utilization in blended cement production at a representative cement plant in China. Sensitivity …
Metal Losses to the Slag in Smelting and Converting. 80% of the copper produced from ores worldwide originates from sulfide ores. The copper concentrate which results from flotation of the ore is typically smelted and converted to blister copper [].During smelting S and Fe are oxidized, where SiO 2 is added to form a liquid ferric or ferrous …
Effect of copper slag and cement by-pass dust addition on mechanical properties of concrete. Constr. Build. Mater. (2006) ... Brick kiln co-treatment is a novel industrial hazardous wastes (IHWs) utilization process. However, the effects of chlorine (Cl) in wastes on heavy metals (HMs) during this process are overlooked. ...
The model predicts the chemistry and viscosity of slag during slag blow and copper blow. The effects of oxygen potential, charge of dirty reverts, slag carry-over, under-blowing, over-blowing, and ...
As shown in Fig. 2.2, the higher the direct reduction temperature, the smaller ΔG Ө, indicating that the reduction reaction is more likely.Fe 3 O 4 in copper slag can be easily reduced to metallic iron, and Fe 2 SiO 4 can also be reduced to metallic iron when the direct reduction temperature is higher than 1036.7 K. If CaO is added in the direct …
Generally, copper loss in slag includes mechanical entrainment loss and chemical dissolution loss [2–5]. Mechanical entrainment is the copper loss entrained in the slag in …
One of the important aims in slag cleaning process is to decrease the liquidus temperature so that solid phase in the slag can be reduced. It has been shown that oxygen partial …
Copper slag is an industrial waste discharged in the process of smelting copper. At present, copper is the second largest non-ferrous metal material in the world in terms of annual output and consumption [12], [13]. The global annual output of copper slag reaches as high as 70 million tons [14], but its utilization rate remains very low.
This research was undertaken to study the effect of copper slag (CS) and cement by-pass dust (CBPD) addition on concrete properties. In addition to the control mixture, two different trial ...
The cleaning of copper slag is an important way to realize the sustainable development of the copper metallurgy industry. CaO is a commonly used additive in the process of slag type regulation and has an important impact on the physicochemical properties of copper slag. However, there are few studies on the mechanism of the …
Many industrial-wastes/clays, such as ground granulated blast-furnace slag (GGBFS), fly ash (FA), cement kiln dust (CDK), and metakaolin (MK), are employed in developing geopolymeric materials ...
The clinker that formed in the kiln was cooled down using air quenching devices, where additional heat was recovered into the pre-heater and ... Al-Hashmi A., Al-Harthy A. Effect of copper slag and cement by-pass dust addition on mechanical properties of concrete. Constr. Build. Mater. 2006; 20:322–331. doi: …
As curing time increases, new cements such as C-S-H, C-A-H, and C-A-S-H gradually form. By mixing cement kiln ash, copper slag, fly ash, phosphogypsum, and lime, cation exchange can be promoted; …
2.1. Materials. The materials used in this study were CKD, slag, and quicklime. CKD was obtained from the Daying cement factory in Fuxin, Liaoning Province, China; the S95 grade slag was produced by the Borun Casting Material Limited Company located in Gongyi, Henan Province, China; and the quicklime was obtained from a local …
Cement kiln dust or a combination of limestone and kiln dust had no effect, while fly ash and blast-furnace slag significantly reduced the chloride ingress. ... copper slag, steel slag, fly ash ...
The extent of matte entrainment depends on turbulence in the furnace, slag fluidity (viscosity/density), operating temperature [], and surface and interfacial tension of matte and slag, as described by Nakamura et al. [].Bellemans et al. summarize the following reasons for metal entrainment in slag: charging of the furnace, oxygen …
Slag and Zinc-Bearing Material in Rotary Kiln. Sustainability 2022, 14, ... and solidification effect of harmful elements. The results revealed that more than 70% of Zn and ... (EAF) [43], copper ...
The main objective of this research is to investigate the potential use of copper slag and cement by-pass dust in concrete as partial replacements for Portland …
A new concept for cleaning copper slag flotation tailings. • Low temperature metallisation of iron volatilises harmful impurities from the slag. • Methane can metallize …
Therefore, as the effect of the partial pressure of gaseous products was considered, Zn and Pb in the copper smelting slag could be completely recovered from the chlorination roasting process [34]. ... 1712âˆ'1720. (in Chinese) [11] WANG H Y, SONG S X. Separation of silicon and iron in copper slag by carbothermic reductionâˆ'alkaline ...
The electric furnace method, the vacuum depletion technology, and the electric field enrichment method are all physical ways to separate the copper in the copper slag; they have an effect on the metal droplets only but are not applicable to the copper oxide and copper sulfide in the copper slag.