Bu çalışmada, Niğde ilinde faaliyet gösteren yedi farklı kırmataş ocağında delme-patlatma sonrası oluşan yığındaki iri blokların (patar) ufaltılmasında kullanılan hidrolik kırıcıların performansına kayaçların fiziksel ve mekanik özelliklerinin etkileri araştırılmıştır. Bu amaçla, yığın malzemesi parçacık boyutlarının belirlenmesi için görüntü işleme yöntemi kullanılarak boyut...
Temporary support of the gob side entry is of great significance to the safety mining. Taking the 1206 transportation tunnel of Shuguang Coal Mine as the engineering background, firstly, the key technical parameters of roof cutting to release pressure were given, the bolt and cable support parameters before entry retaining and the large deformation constant resistance cable...
In this work, the dissolution properties of a dolomite containing zinc carbonate (smithsonite) ore sample having 24.22% ZnO were determined in sodium hydroxide solutions using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermal (TG/DTA) and chemical analyses methods. It was observed that the dissolution efficiency value of zinc continuously increased...
The extraction of lanthanum (La) and cerium (Ce) from a bastnasite ore by direct acidic leaching was investigated. The effects of acid concentration and leaching temperature on the extraction of La and Ce from the ore were tested. Using nitric (NHO3), more than 85% of the La and Ce were simultaneously extracted into leach solution whereas the La and Ce dissolutions were...
Underground mines are known as mines of particular importance, for the production difficulties, production cost, safety factor and workforce number. Ore is mined from the depths of the underground with a preliminary justification on the amount of ore at the source, the quality of the ore and general reserves and then based on them the daily, monthly or annual production is...
Kalsitin dolgu malzemesi olarak kullanıldığı sektörlerde yapıya uyumluluk ve kazandırdığı avantajlar açısından yüzeyinin modifiye edilmiş (kaplanmış) olması istenmektedir. Hem laboratuvar çalışmalarında hem de endüstriyel ölçekte mikronize kaplanmış kalsit üretimi öncesinde, sırasında ve sonrasında cevheri karakterize etmek için birçok yöntem ve süreç uygulanabilmektedir...
Endüstriyel bir hammadde olan kalsit, birçok sektörde dolgu minerali olarak kullanılmaktadır. Genellikle, mikronize boyutlara ufalanan kalsit bir yüzey modifikasyon (kaplama) işlemine tabi tutularak hidrofilik (su sever) yapısı hidrofob (su sevmez) yapıya dönüştürülmektedir. Böylelikle, mikronize+kaplanmış üretilen kalsitin ürün fiyatı yükselirken, kullanıldığı alanlarda ise...
Kobalt, jet motorları, süper alaşımlar, şarj edilebilir piller gibi özellikle ileri teknoloji ürünlerinde kullanılan bir metaldir. Yüksek ekonomik önemi ve temin riski göz önüne alınarak Avrupa Birliği (AB) tarafından “kritik hammadde” olarak tanımlanmıştır. Birincil kaynaklardan üretilen kobaltın %84’ü bakır ve nikel üretiminin yan ürünü olarak sağlanmaktadır. Özellikle...
Bu çalışmada, mikrodalga enerjili ısıtmanın, refrakter özelliği gösteren düşük tenörlü altın konsantresine olan etkileri, Box-Behnken deney tasarımı yardımıyla kızdırma kaybı üzerinden modellenerek incelenmektedir. Mikrodalga enerji uygulandığında, ısıtma veya bölgesel kavurma prosesinin etkili parametreleri olarak güç (Watt), süre (dakika) ve kütle (g) bağımsız değişkenleri...
Schmidt çekici ile sertlik tayini maden, jeoloji ve inşaat mühendislerince uygulanan disiplinler arası bir deney yöntemidir. Yüzey pürüzlülüğü Schmidt sertliğini etkileyen önemli bir parametredir. Bu çalışmada doğal, taşlama yapılmış ve kesilmiş yüzeylerin olduğu blok numunelerde ve karot örneklerde ölçümler yapılmış ve sonuçları karşılaştırılmıştır. Ayrıca her yüzeyin pürüzlülük...
In this study, Faujasite (Na-LSX) (3.5(Ca0.3)3.5(Na0.6)3.5(Mg0.1)Al7Si17O48•32(H2O)) type zeolites and Ca-Filipsite (CaK0.6Na0.4Si5.2Al2.8O16•6(H2O)) type zeolites were produced from Sugözü Thermal Power Plant and Çatalağzı Thermal Power Plant fly ashes by alkali fusion method followed by water leaching, respectively. In these methods, fly ashes and sodium hydroxide (NaOH) were...
Fatal accidents in underground coal mines in Turkey are common and experienced frequently. The major accident categories for underground coal mining in Turkey are gas related accidents (firedamp and outbursts), roof falls, flooding, fire and transport. In recent years, coal mine gas related accidents in Turkey, which are usually caused by firedamp and outbursts, are still...
In this study, the detailed mineralogy and beneficiation possibilities of a lateritic nickel ore from Mihalıççık-Eskişehir region was investigated. Quantitative mineralogical analysis of the ore was performed using MLA (Mineral Liberation Analyzer); ernienickelite and pimellite minerals were determined as nickel bearing minerals. Heavy liquid test was performed to determine the...
In this work, the selective dissolution of zinc and manganese in the waste alkaline battery powders was investigated by applying two-stage leaching method. In the first-stage of leaching, zinc in the battery powder was dissolved using NaOH solutions. The solid residue containing manganese was separated from the solution by filtration and used in the second leaching step. Sulfuric...
In this study, open circuit single and two stage industrial scale vibrating ball mill (VBM) grinding performance of raw (uncrushed) cement clinker was investigated using different mill feed size distributions and grinding ball size configurations. The mill was modelled for the test cases using perfect mixing mathematical modelling approach. Different ball size configurations were...
Modelling of grinding circuits is crucial for circuit design and optimization. Determination of breakage distribution function of the materials is important for accurate and reliable modelling. In this study, the model structure was focused on using separate breakage tests for each chamber. Within the study, sampling studies were performed around the grinding circuit containing 2...
With the developing technology in recent years, the variety and production of electronic products has increased rapidly. The amount of unused products increases with high consumption rate, these products are disposed as scrap. These types of scrap, called electronic waste, cause serious damage to the environment and livings due to the harmful elements and components. Apart from...
In this study, the detailed mineralogy and beneficiation possibilities of a lateritic nickel ore from Mihalıççık-Eskişehir region was investigated. Quantitative mineralogical analysis of the ore was performed using MLA (Mineral Liberation Analyzer); ernienickelite and pimellite minerals were determined as nickel bearing minerals. Heavy liquid test was performed to determine the...
In this work, the selective dissolution of zinc and manganese in the waste alkaline battery powders was investigated by applying two-stage leaching method. In the first-stage of leaching, zinc in the battery powder was dissolved using NaOH solutions. The solid residue containing manganese was separated from the solution by filtration and used in the second leaching step. Sulfuric...
In this study, open circuit single and two stage industrial scale vibrating ball mill (VBM) grinding performance of raw (uncrushed) cement clinker was investigated using different mill feed size distributions and grinding ball size configurations. The mill was modelled for the test cases using perfect mixing mathematical modelling approach. Different ball size configurations were...
Modelling of grinding circuits is crucial for circuit design and optimization. Determination of breakage distribution function of the materials is important for accurate and reliable modelling. In this study, the model structure was focused on using separate breakage tests for each chamber. Within the study, sampling studies were performed around the grinding circuit containing 2...
In this research, a series of characterization studies were carried out on Ayazini and Seydiler tuffs which are used as building stones around Afyonkarahisar. Petrographic-mineralogical (polarizing microscope, XRD), chemical analysis, porosity distribution and physico-mechanical properties of the mentioned rocks have been determined. Water is an important factor in the weathering...
In this study, selection of appropriate profile material and a profile section by using finite elements method during the design studies of the mine roadway support having a cross-section of 5,75 m2 was aimed. The support type was trapezoidal sectioned rigid steel support. In parallel with the aim of this study, load-profile section optimization studies were carried out by...
A fuzzy mean and range control charts were used to monitor the production process. Fuzzy control charts were validated through a case study at the aluminum production company by collecting data from the factory and comparing it to the traditional Shewhart control charts which have been already applied by the factory for monitoring the process. The results reveal that the proposed...
Considerable amounts of wastes are generated as a result of the production and processing operations in the natural stone sector. These wastes cause some environmental problems (topography change, surface/underground water pollution, air/visual pollution and so on). In this study, potential use of the granite wastes (coarse and fine size) as abrasive in natural stone cutting with...