Coal mine floor limestone aquifers are a major source of water inrush from the coal seam floor and a serious threat to the safety of coal mining. In order to reduce and avoid the occurrence of water inrush within the coal mine, we use multiple detection techniques, which are geophysical exploration technology, drilling technology, water inrush accidents and tracer test, to...
Noise has many negative physical and mental effects both in working life and in daily life. These effects differ according to the frequency, intensity, exposure time and noise level of the noise. Ignoring the noise problem in working life creates irreversible and untreatable hearing loss on employee health. As a result, working efficiency is negatively affected. In this study...
Aggregate production is a vital element in the sustainable development of countries where urbanization is rapidly increasing. With the urban population rise, the demand for aggregates which are the basic raw material for the construction and maintenance of buildings needed by cities is increasing. It is possible to estimate this increase in demand in the long run with multiple...
Waste segments generated by the abrasion of diamond-impregnated cutting segments used in natural stone cutting processes have a high content of base and precious/critical metals (20-92% Cu, 10-38% Co and 0.1-0.9% Ag, 0-75 Fe) as well as synthetic diamonds. In this study, recovery of critical and precious metals (Co, Cu, Ag) from waste segments (0,91% Ag, 15,8% Co, 51,9% Cu...
Since 2012, low commodity prices have forced many mining companies to suspend or cease operations. To remain in business, some mine managers are exploring strategies to reduce operational costs. Given its importance as a cost element, increasing bench drilling efficiency and performance in open-pit mines has the potential to generate considerable savings. Efficiency and...
Recent advances in high-tech applications have highlighted the growing demand on highly pure silicates like quartz. Therefore, purification of quartz ore was determined as the subject of this study performed by pyrometallurgical followed by hydrometallurgical processes. In this research, the effect of thermal treatment (TT) followed by oxalic acid (OA) bleaching of quartz was...
Underground exploitation of lead (Pb) and Zinc (Zn) metal ore is one of the issues that requires safety during the exploitation and professional solutions for economic issues, moreover, the complicated exploitation of ore in great underground depths is imposed by the various geological mass layers that limit the production volume. In the ore exploitation process, drilling and...
In this study, it was aimed to recover metallic values by gravity methods from the floor sweeping waste with high gold and silver contents, which are produced as a result of various activities in the jewelry workshops. In addition, the metallic values that remains in the slag phase after thermal process of the floor sweeping wastes were concentrated by centrifugal separators. As...
In this study, the potential of reducing the iron content in an olivine sample obtained as the final tailing in chromite enrichment was examined via magnetic separation methods. Within this scope, the as-received sample was firstly divided into three fractions as +212, -212+150 and -150 µm. Dry magnetic separation was then applied to the coarse fractions and wet magnetic...
This study compares the efficiency of different methods in beneficiation of iron ore from Doğanşehir (Malatya) region. It is a low grade ore with 27.43 % Fe content that requires concentration to meet the specifications of blast furnace feed. The ore mainly contains magnetite, ferro-actinolite and magnesioferrite. The collected samples were classified into different size...
Recovery of gold from copper-rich gold ores has proved challenging. Dissolved copper in cyanide-deficit leach solutions severely interferes with adsorption of gold resulting in low recoveries onto activated carbon or ion exchange resins. This study reports the efficiency of different adsorbents for selective recovery of gold from the copper-containing cyanide leachate. Activated...
In this study, studies were conducted to remove impurities such as iron, titanium, and aluminum from quartz sand with low SiO2 content for use in industry. Physical, physicochemical, and chemical methods were applied on silica sand containing 82.03% SiO2, 3.13% Al2O3, 0.48% Fe2O3, and 0.17% TiO2 obtained from Camiş Madencilik A.Ş. Magnetic separation was performed as a physical...
In this study, artificial neural networks (ANN) were used as a tool for estimation of blast-induced vibrations. For this purpose, the blast shots carried out in a quarry in Istanbul were monitored and the blast-induced vibrations were recorded. Peak Particle Velocities (PPV) and Scaled Distances (SD) of 24 events were recorded in the first 12 shots, subjected to statistical...
The modulus of elasticity is used as the basic input parameter in the design and analysis of rock engineering structure. The design and construction of underground caverns in salt domes is important for rock engineering. It is necessary to determine the rock properties in order to adjust the solution mining parameters applied during the design and construction of underground...
During the production of electrical energy from coal-fired thermal power plants, calorific and unit power values are the most important indicators for evaluating the productivity of the process. These values are measured periodically, and the resulting measurements are monitored to detect root causes of variation that may occur in production process. As this application is...
Bu çalışmada Sivas Kangal linyit kömürü ile Gebze MDF ve Yonga Levha Gazlaştırma Tesisi ön çalışmalarında elde edilen odun atığının adsorban olarak kullanılma olanakları araştırılmıştır. Böylelikle hem atıkların değerlendirilmesi hem de daha ucuz ve kolay elde edilen malzemeler ile çevre kirliliğinin önlenmesi amaçlanmıştır. -75 μm boyutuna kırılıp öğütülen ve adsorban olarak...
The production of gold from refractory gold ores has been increasing due to the exhaustion of free milling gold ores. The presence of cyanicides (e.g., copper minerals) and encapsulation of gold in minerals such as pyrite and arsenopyrite are common reasons for refractoriness of gold ores. In this study, the amenability of a copper-rich gold ore (108 g/t Au, 1.60% Cu) to cyanide...
Tricone bit is the most common used type of rotary drilling bits in surface mining. Even though IADC is usually used to select these bits, there are many parameters which affect drilling rate and durability of them. Users have tendency to select bits with higher IADC codes, since unqualified productions are becoming widespread in these days. This causes decreasing drilling rates...
Suspicions of diverse pollution of groundwater in the villages of Dremjak, Talinoc i Muhaxherve, Softaj, Gërlicë and Varosh of the Ferizaj municipality motivated the investigation of empirical quality of the water wells from which the inhabitants of the villages provided drinking water. Considering that drinking water is the basic element for humans to live, its testing prior to...
Gelişen ülkeler veya şehirlerde artan nüfus ve yapılaşma ile birlikte inşaat sektörünün temel yapı taşı durumunda olan agregaya ihtiyaç artmaktadır. Yapıların ihtiyacını karşılamak amacı ile yerleşim yerlerine yakın taş ocakları açılmakta ve ocaklardan elde edilen malzemeler her ne kadar inşaat sektöründe büyük oranda kullanılabilse de; arta kalan ince taneli malzeme atık olarak...
Bu çalışma kapsamında bir triboelektrik ayrım düzeneği tasarımı ve bu düzeneğin ülkemizdeki belli başlı kömür cevherlerinin ince boyda zenginleştirilmesinde kullanımı incelenmiştir. Deneysel çalışmalarda kullanılmak üzere Tunçbilek ve Soma bölgelerinde konumlanmış, işletmesi devam eden dört farklı lavvardan kömür numuneleri temin edilmiştir. Deneysel çalışmalarda kullanılmak...
Bu çalışmada kalker, mermer artığı, kil taşı, tras, alçı taşı ve klinker üzerinde Hardgrove ve Bond öğütülebilirlik testleri yürütülmüştür. İki farklı tesise ait klinker örnekleri üzerinde 35 ve 45 dakika öğütme süresi sonunda klinkerlerin incelik değerleri karşılaştırılmıştır. Endüstriyel ölçekte farklı tesislere ait özdeş iki değirmende Cem I 42,5 R ve Cem IV/B 32 R çimentoları...
Son yıllarda hızlı bir gelişim gösteren ulaşım ağı projeleri kapsamında inşa edilen tünellerin en çok karşılaşılan sorunlarından biri portal şevlerinin duraylılığıdır. Portal şevlerinde meydana gelen yenilmeler zaman zaman tünelde de duraylılık problemlerine sebep olmakta ve sorunu büyütmektedir. Bu çalışma kapsamında, buna tipik bir örnek olan Ankara-Sivas Yüksek Hızlı Tren...
The existing blast fragmentation models were investigated in a sandstone quarry for bench blasting operations. It was tried to present different perspectives for evaluation of blast fragmentation. Size distribution curves were created for each blast. KuzRam model provided successful results. Kuznetsov-Cunningham-Ouchterlony (KCO) model was useful especially for the fine size...
When the cement grinding is performed in the ball mill, the grinding efficiency decreases due to the aggregation of the particles by the electrostatic phenomenon. Therefore, a lot of techniques for preventing agglomeration using various grinding aids have been introduced. In this study, for mineral grinding, the grinding aid composition including a water-soluble aluminate...