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: 10.1016/j.conbuildmat.2005.01.020 ...
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 ...
Cement kiln dust (CKD) is a by-product of cement production, which has the shortcomings of low utilization and high-temperature activation. This study combined CKD and slag as precursors for preparing pastes through quicklime activation under ambient conditions. The effects of quicklime and CKD content on the workability (flowability and setting time), …
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. Increase in …
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 ...
To eliminate the negative effects caused by nonferrous metals when using copper slag in the steelmaking industry, a new scheme was proposed to treat copper slag, involving nonferrous metal removal via chlorination, iron oxide reduction, and remaining slag …
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 content of 6% …
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 potential or temperature gradients …
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 analysis was performed on the substance inputs, and the life cycle impact assessment (LCIA) model was applied. A detailed comparative analysis was conducted of the …
In this paper, a study of processing pyrite cinder and metallurgical slag using a 'one step' technology in strand grate–rotary kiln at a laboratory scale is presented, which aims to …
Effect of CKD content on compaction properties. The experimental loess compaction curves, and the deduced variations in OMC (w opt) and MDUW (γ d, max) with increasing CKD content, are shown in Fig. 3pared to the unamended loess soil (w opt = 14.4% and γ d, max = 18.96 kN/m 3), increasing the CKD content causes a progressive …
This paper provides a thermodynamic analysis of the copper flash smelting process which was done based on calculation with the FactSage thermodynamic software …
Abstract: 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 …
Moses and Saminu (2012) had also studied the effect of cement kiln dust (up to 16%) on . ... Havanagi et al. (2006) had mixed Copper slag (a waste generated during the manufacture of .
Thus, implementing technologies of slag treatment is a complex and challenging task. Within this paper, application options, the environmental behavior, and ways to treat …
The cement kiln by-pass dust replacement of cement was 0.7% and 1.7%, to satisfy the Cl- ions content in cements: lower than or equal to 0.1%, following the demand of PN-EN 197-1:2012 standard ...
Copper slag is characterized by its high hardness and decent spray de-rusting effect, indicating its suitability as a de-rusting abrasive. Therefore, copper slag is used as an abrasive for steel …
Abstract. Global copper slag (CS) emissions reached 57.2 million tons in 2021. Despite the increasing reuse of CS, the treatment of CS is still dominated by landfill so far, …
The harmless treatment of historical lead smelting slag (LSS) is of significance to ecological and environmental protection, but it is still challenging in terms of the economic feasibility of alone processing due to the low content of valuable metals. Here, we performed an industrialized test with a co-treatment of LSS and zinc oxide ore in a rotary kiln to evaluate the …
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 mixture was fed into a rotary kiln, into which pulverized coal was blown. At different temperature regions in the rotary kiln, some oxides in the feedstock were chlorinated to form chlorides (such as ... Effect of the fineness of copper slag on the early hydration properties of cement–copper slag binder. J. Therm. Anal. Calorim., 138 ...
Annually more than 400 Mt of metallurgical slags are produced worldwide [1,2,3,4,5].From the annual Cu concentrate smelter production capacity, which is equal to around 21 Mt of copper metal in 2021, it can be estimated that more than 45 Mt of CUS were produced from primary sources assuming a slag to copper ratio of 2.2 [3, 4].Only 15% of the CUS …
A thermodynamic model of the copper Peirce-Smith (P-S) converter has been developed to predict the behaviour of magnetite in the converter slag, the amounts of slag and matte, the compositions of ...
The slag leaves the kiln at the opposite end and is granulated. ... Thermodynamic modeling has been used to simulate copper smelting [7-8 ... Length of Waelz Kiln, m Figure 5. Effect of extra coal ...
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 ...
According to Abdulabbas 8, the effect of replacing portions of ordinary Portland cement and sulphate resisting Portland cement in concrete mix using certain percentage of cement kiln dust was ...
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 reduction process, …
Then, I fire it using my kiln at around 790 degrees Celsius. You can also fire it using a torch. Depending on what flux and brand of enamel you are using the time and temperature you need to fire your piece can be different. ... In copper, you might see some greenish spots appear. Again, you might use over-firing intentionally, like what I did ...
The injection of air into the slag and the temperature profile along the kiln have been modeled. The effect of (CaO+MgO)/SiO2 on the solidus temperature of slag has also been predicted and ...
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 ...
DOI: 10.1016/j.fuel.2024.130875 Corpus ID: 266828541; Negative effect of industrial waste residue additives (IWRA) on NO reduction by selective non-catalytic reduction (SNCR) in cement plant: A comparison between copper slag and iron-ore slag
This is 25–30% of copper fed from the concentrate. The high content of copper in the slag results from the significant oxidation of the concentrate components in the furnace reaction shaft. This procedure is necessary to obtain a lead concentration below 0.3% in blister copper. Flash smelting slag also contains lead in an amount of 2.5–4% ...
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 cement. The …
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 mainly in the form of …
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 91.55%, and the Fe recovery …
