Yazar "Sis H." seçeneğine göre listele
Listeleniyor 1 - 3 / 3
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Effect of fly ash and marble powder on and flow properties and compressional strength of grouts(Baski, 2019) Sis H.; Kiyak T.; Fenerli C.; Genç M.Coal fly-ash and marble powders are two environmentally important industrial waste materials that should be utilized. It is known that they are used as additives in concrete production for many years. In this study, the usability of fly-ash and marble powder in grout production was investigated. Flyash and marble powder utilized in the tests were obtained from Soma (Manisa) power plant and Akçadag (Malatya) region, respectively. Pozzalanic fly-ash and reactive marble powder were used in grout mixtures as partial replacement materials for cement and aggregate, respectively. Flow and strength properties of the grouts prepared at different water/cement ratios were tested and the effect of the additives were determined. Rheological properties of the mixtures were tested at a wide range of shear stress-shear rate by utilizing a rheometer. Additionally, the prepared mixtures were cast into moulds and the 28 day strength of the cubes were determined by uniaxial compression tests. Test results showed that the increasing water/cement ratio increased the fluidity the grout mixtures, but inversely affected the strength of hardened grouts. The results showed that addition of fly ash decreased the 28 days strength of hardened grout by improved the fluidity of fresh grout to some extend. On the other hand, marble powder decreased the fluidity of mixtures but increased the strength of hardened grout significantly. Copyright © IMCET 2019 International Mining Congress and Exhibition of Turkey. All rights reserved.Öğe ENRICHMENT OF LOW-GRADE MAGNETITE ORE BY MAGNETIC AND GRAVITY SEPARATIONS: EFFECT OF PARTICLE SIZE(Chamber of Mining Engineers of Turkey, 2021) Sis H.; Karaağaç T.; Birinci M.; Kıyak T.This study compares the efficiency of different methods in beneficiation of iron ore from Doğanşehir (Malatya) region. It is a low-grade ore containing 27.43 % Fe which requires concentration to meet the specifications of blast furnace feeds. The main mineral composition of ore is magnetite and also contains magnesioferrite, ferro-actinolite and calcite minerals. The collected samples were classified into different size fractions after size reduction and then subjected to different gravimetric and magnetic separation methods for concentration. The results showed that particle sizes affected the concentrations to a large extent and generally cleaner concentrates were obtained at finer sizes for a certain separation method. On the other hand, wet magnetic separation yielded comparably better results than gravimetric methods. A concentrate assaying 65.66 % Fe and 0.38 % K2O+Na2O was obtained with 78.11 % recovery by wet magnetic separation. It was concluded that concentrates meeting blast furnace specifications could be obtained from this low-grade iron ore. It was also concluded that the proposed separation flow sheet can be applied to similar low-grade iron ores in the region. © 2021 Union of Chambers of Engineers and Architects of Turkey. All rights reserved.Öğe Investigating acid mine drainage potential and alteration properties of Zn-Pb wastes from Görgü (Malatya, Türkiye) region(Oficyna Wydawnicza Politechniki Wroclawskiej, 2023) Sis H.; Başaran B.Acid mine drainage (AMD) is one of the main causes of environmental threats resulting from mining activities, yet efficient characterization and prediction of AMD potential of wastes play an important role in preventing AMD. In this study, the chemical and mineralogical properties of fresh waste samples, collected from waste ponds of the Görgü (Malatya) zinc-lead ore processing plant, were determined and the results were used to explain its AMD potential. Alteration properties of the wastes in water was investigated by monitoring certain properties of the prepared suspension with respect time. Additionally, pyrite concentrate particles were added into the suspensions at certain proportions to evaluate its effect on the AMD generation and alteration. Analysis and test results showed that the raw waste was rich in carbonate and poor in pyritic sulfur, and hence did not have the AMD generation potential. The pH, electrical conductivity, and metal ions concentrations of the suspension medium were determined at regular intervals, and obtained data were found very beneficial to explain the time-dependent behavior of waste in water. After the depletion of liquid in the suspension, the remained solid residuals were chemically and mineralogically analyzed to compare with raw waste. It was concluded that sufficient aeration and stirring of suspension is required for noticeable alteration of the waste. © Wroclaw University of Science and Technology
