Scopus İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/395
Browse
3 results
Search Results
Conference Object Modelling of Rock Comminution Using Statistical and Soft Computing Analyses – A Case Study on a Laboratory-Scale Jaw Crusher(Baski, 2022) Köken, E.The present study encompasses a quantitative investigation on rock comminution using statistical and soft computing analyses. For this purpose, physical and mechanical rock aggregate properties were determined for nine different rock types (R1-R9) in Turkey. Then, crushability tests were performed to determine the size reduction ratio (SRR) using a laboratory-scale jaw crusher. Based on statistical and soft computing analyses, five different predictive models (M1 to M5) were established to estimate the SRR in this study. Consequently, the SRR values are associated with water absorption by weight (w<inf>a</inf>), dry unit weight (γ<inf>d</inf>), and aggregate impact value (AIV) of the investigated rocks. However, the individual use of these independent variables results in undulating SRR estimations. Therefore, among the established predictive models, the empirical formulation based on artificial neural networks (ANN) (M5) was found to be the most reliable model with a correlation of determination value (R2) of 0.88. However, the predictive models stated in this study should be implemented to several portable jaw crushers to observe the similarities or difficulties in quantifying SRR as a function of rock properties in future studies. © 2022 Elsevier B.V., All rights reserved.Conference Object Citation - Scopus: 2Leaching of Yahyali Non-Sulphide Pb-Zn Flotation Tailing Using Organic Acids(Baski, 2019) Hussaini, Shokrullah; Kursunoglu, Sait; Kaya, MuammerThe laboratory scale leaching of Kayseri-Yahyali non-sulphide lead (Pb)-zinc (Zn) flotation tailing using two organic acids was experimentally investigated. The effect of citric and oxalic acid on the dissolution of Zn, Pb, iron (Fe) and arsenic (As) was individually investigated under the following conditions: citric or oxalic acid concentration of 0.5-1.0M, temperature of 60-80°C and leaching time of 30-180 min. at 1/10 solid-to-liquid (S/L) ratio. 90.1% Zn dissolution was achieved using 0.5 M citric acid at 80°C leaching temperature for 180 min leaching time. The Fe, Pb and As dissolutions were determined as less than 20% under the conditions tested. 95.5% Fe and 68.8% As were removed from the flotation tailing along with less than 5% of Zn and Pb using 1.0 M oxalic acid for 180 min. leaching time at 60°C leaching temperature. It was found that citric acid is more prominent than oxalic acid for the selective leaching of zinc from the flotation tailing whereas a substantial amount of iron and arsenic removal can be achived by oxalic acid leaching. The use of NaCl along with citric acid was not useful for higher Zn dissolution. Based on the experimental results, an appropriate process will be improved for the selective leaching of valuable metals from the Pb-Zn non-sulphide flotation tailing in the near future. © 2020 Elsevier B.V., All rights reserved.Conference Object An Experimental Investigation on Rock Crushability Using Jaw and Cone Crushers(Baski, 2019) Köken, E.; Bilen, Mehmet; Özarslan, Ahmet; Baris, KemalThis study covers the investigation of rock crushability using laboratory-scale cone and jaw crushers for five types of hardrocks. For this purpose, physico?mechanical properties of the investigated rocks are determined. Aggregate samples with a particle size range of 10.00 - 14.00 mm are prepared for crushability tests. After performing crushability tests, crushed particles are sieved and considering sieve analysis results, crushability indices are identified for each rock and crusher type. The performance of the crushers concerning their experimental setup is investigated by Taggart method. It is achieved from crushability tests that, the performance of the cone crusher is approximately two times better than the one of the jaw crusher for their experimental setups. The crushing time (Tc) seems to increase with increasing in rock strength properties. Furthermore, remarkable relationships are obtained between several rock properties and crushability test results. It can be claimed that crushability of rocks are dependent upon crusher type, setup of crushing process, rock strength as well as the mineral hardness. Considering these types of variables, higher achieving benefits of aggregate production could be satisfied at lower costs. © 2020 Elsevier B.V., All rights reserved.