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May 19 2010nbsp018332how is coal formedltbr gtcoal is made up of carbon hydrogen oxygen nitrogen and sulphur the three main types of coal are anthracite bituminous and lignite anthracite coal is the hardest and has more carbon lignite is the softest and is.
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3 fossil fuel formation activity 3 coal ranks and their heating value powerpoint covers coal ranks and their heating value an option is provided so that this activity can be done in a laboratory classroom if coal specimens are available student worksheets are needed students will need to use a.
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Grinding Ex 1 1 You are grinding a steel which has a specific grinding energy u of 35 W smm3 The grinding wheel rotates at 3600 rpm has a diameter D of 150 mm thickness b of 25 mm and c 5 grains per mm2 The motor has a power of 2 kW The work piece moves v at 1 5 mmin The chip thickness ratio r is 10.
The cryogenic grinding lowers the thermal related problems Reduced grinding forces High M R R can be achieved Minimizing residual stress and micro cracks Retention of wheel grit sharpness i e low rate of grit wear Surface finish dimensional accuracy and tool life improved Difficult to machine materials can also be machined Moreover use of.
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