A fundamental study of respirable dust generation in coal
Introduction The generation of fine fragments (respira ble dust) during various coal mining processes may lead to the incidence of coal workers'' pneumoconiosis (black lung disease). The hu man and direct cost of dustinduced illnesses in coal miners is very large. By several accounts [1,2], the Federal Government paid out about 12 billion to ...احصل على السعرWhatsApp
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Theories of interaction of rock cutting tools SlideShare
Mechanical Excavation Systems These basic cutting methods, defined in terms of tool type, are and include: bit cutting. Drag type 2. Pointattack bit cutting. 3. Disk cutting. 4. Roller cutting. Indenters 5. Button cutting. Fig: Rock Cutting Techniques Mechanical Excavation Systems Drag bit cutting and Pointattack bit cutting.احصل على السعرWhatsApp
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(PDF) Performance Analysis of Two Different Conical Picks Used in ...
This paper examines linear cutting operation of coal samples by using two kinds of conical picks, each made of different materials. The first one is the conventional pick. It has an abrasive ...احصل على السعرWhatsApp
Critical Analysis of Wear Mechanisms in Cemented Carbide ResearchGate
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Critical Analysis of Wear Mechanisms in Cemented Carbide
Wear phenomena of cemented carbide (94 wt.% WC, 6 wt.% Co) tip of conical picks have been observed by field emission scanning electron microscopy, energy dispersive xray spectroscopy (EDS), and xray diffraction analysis (XRD). The conical pick is one type of the cutters which are used to excavate soft structure like coal. It has a coneshaped abrasive part made of cemented carbide (CC). The ...احصل على السعرWhatsApp
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