MODULE 5 FUNCTIONAL PERFOMANCE OF BALL. Effective mill power draw 24 Ball mill specific grinding rate 29 Ball mill grinding efficiency 33 equation for ball mill circuits Define and calculate the classification system efficiency of a ball product fines produced per unit of effective energy
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read moreMODULE 5 FUNCTIONAL PERFOMANCE OF BALL. Effective mill power draw 24 Ball mill specific grinding rate 29 Ball mill grinding efficiency 33 equation for ball mill circuits Define and calculate the classification system efficiency of a ball product fines produced per unit of effective energy
get priceWI Work Index specific energy per ton, kwh/metric ton (characterizes the ore) F80 80% passing size of the circuit feed, in microns. P80 80% passing size of the circuit product, in microns. Example. The dry feed of a ball mill circuit is 300 t/h. The power at the pinion of the ball mill is 1800 kW.
get priceEspecic energy modelling SAG mills operation data abstract Comminution, particularly milling, is on average the largest consumer of energy in mining. Actual com-minution circuits consist in most of the cases in coarse crushing, SAG milling, pebble crushing and sec-ondary ball milling. In these circuits the SAG mill is the largest energy ...
get pricefactors for feed size and pebble ing are applied to the AG/SAG specific energy, as well as specific crush energy adjustment from 1.7 mm to the mill transfer size T 80 using Bonds Law (Starkey amp Larbi, 2012). The Bond equation is used to calculate ball mill specific energy from T
get pricethe ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction). Hence from equation 7, to crush to the ball mill circuit feed size (x. 2) in open circuit requires specific energy equivalent to f x f x 2. 1 W c ic. 1.19* 4 2 M x x. 1 (10) For closed circuit crushing the specific ...
get priceOct 19, 2017 Wi specific energy consumption, kW*h/ton C the mill drum rotational speed,% of the critical speed D the mill internal diameter, m. At result B 25mm or less necessary to use the correction factor 1.3, i.e. the grinding balls average diameter should be 32.5 mm in the feed mixture.
get priceTarget energy efficiency 58 EE Em(SP)/Em(Mill)X50 100 (8) EE-energy efficiency, Em(SP)-specific energy used to generate a product with a given average dimension X50, and Em(Mill)X50-net ...
get priceC.2.4 Fine Particle Tumbling Mill Specific Energy 11 C.2.5 Total Net Comminution Specific Energy 12 C.3 Conventional Crushing/Ball Mill Circuit 12
get priceend the energy Ei (Joules) is recorded and the specific energy ei Ei/m (Joule/kg) is calculated. Dividing by 3600 the specific energy can be transformed to (kWh/ ton). Finally the product is wet screened to find the size d80. 2.2. Ball Mill Batch Process The mill
get priceThe Bond Ball Mill WI Test Equipment and Procedure (Revised March 26, 2015) Introduction and Background ... Calculate W, the specific work or energy input, from the size reduction equipment power (kW) and circuit tonnage (t/h). (Auxiliary equipment power is excluded.)
get priceSemi-autogenous (SAG), rod and ball mills. As well as the total specific energy it will also predict the specific energy of the crushing section, the HPGR section and the tumbling mill section separately. Hence, for example, in the case of an SABC circuit the total specific energy of the entire
get priceOct 24, 2018 Specific Energy Consumption is the power draw of a mill ... (the Bond ball mill work index determination is a common example) ... To calculate the operating work index of a
get priceCalculate the Bond specific energy of each ball mill test, E ball 10 Wi (P80-0.5 - F80-0.5). If you are going to use Morrell equations, then also calculate the Morrell specific energy for each ball mill test, E ball 4 Mib (P80-0.295-P80 10-6 - F80-0.295-F80 10-6). Fit the specific energy results for all BM tests, E ball K P 80-a.
get priceSpecific comminution energy of ball mills crushers specific comminution energy of ball mills social-safety.nl. Optimizing The Control System Of Cement 2014-3-21Ball Mill Cyclones Weight Feeders Recycling Elevator Sep. Feed Mill Feed Sep. Return Final
get priceAbstract We propose a new model for the prediction of the specific grinding energy, which proved to approach very well the values calculated with the help of the Denver slide rule. The proposed model, combined with a model giving the ball-mill power draw, is used for the ball-mill
get priceDec 18, 2013 where W is the specific grinding energy (kWh/t), W i is the Bond ball mill work index (kWh/t), F80 is the feed 80 pct passing size (m), and P80 is the product 80 pct passing size (m). It can be seen that in the regime in which the Bond equation is valid, energy use increases exponentially as product size decreases with constant feed size ...
get priceFirst, a Jar Mill grindability test requires a 5 lb. (2 kg) sample and produces a direct measured specific energy (net Hp-hr/t) to grind from the design feed size to the required product size. The second test, a Bond Work Index determination, results in a specific energy value
get priceIn contrast, when the SSE75 was calculated, it showed the SAG mill consumed 20% less energy to produce final product material than the ball mill. Since the aim of a comminution circuit is to generate final product material, the SSE methodology gives a fairer indication of energy efficiency.
get priceTECHNICAL NOTES 8943 . Figure 8.15 Residence-time distribution function for solids in a continuously operating ball mill.into the mill and examining how the specific power input varies with mill size and with design and operating1.35 (8.114) To size a ball mill or rod mill that must process W tons/hr it is necessary to calculate...
get priceBall mill capacity tends to increase with larger circulating loads, but this increase is restricted due to limitations in classification efficiency. Classification efficiency is defined as the percent of final product size material recovered to the classifier fine stream. ... The calculated specific energy consumption per ton of new product ...
get price2.5.2 Replacing a Ball Mill with a Vertical Roller Mill, High-Pressure Grinding Rolls, ... ENERGY EFFICIENCY PROJECTS IN INDUSTRY ... Table 1 Specific Thermal Energy Consumption by Rotary Kiln Type ..... 4 Table 2 Production Gains Achieved ...
get priceFeb 08, 2017 Therefore, the work of the mill with partial load conditions is unprofitable. Energy consumption for ball mills is a function of many factors the physical properties of the ground material its specific gravity and hardness the degree of drum filling by grinding balls the number of drum rotations, etc. Ball mills have low efficiency ...
get pricemill production near optimum, with little operator intervention. The main principle of the concept is that maximum production is obtained from a ball mill when the mill motor power is at a maximum and consequently the specific energy consumption is at minimum. The maximum power point is dependent upon the feed material characteristics,
get priceSpecific Energy Consumption Conversion Factors S. No Description Units Base Line Year (BY) Assessment Year (AY) 1 Total Specific Energy Consumption (Writing Printing ) kcal/Tonne 3534198.26 3261280.66 2 Total Specific Energy Consumption (Paper Board) kcal/Tonne 3028398.973 3002746.136 4 Total Specific Energy Consumption (Speciality)
get priceJul 01, 2003 The specific energy is ultimately determined through actual product testing, but there are a few indicators to predict which mill will be the most efficient. Grinding Media Size Effect The ability to operate a mill with smaller-diameter grinding media greatly increases the mills efficiency and can overall further increase the quality of ...
get priceBM Ball mill specific energy from T 80 1.7 mm to final product P 80, using Bonds Law, (kWh/t) W T Total grinding mill circuit specific energy (kWh/t) Note that K BM is the composite of EF3, EF4 and EF5 factors for ball milling (Rowland, 1982). Get Price
get priceThe well-known American author, Bill Bryson, once said Physics is really nothing more than a search for ultimate simplicity, but so far all we have is a kind of elegant messiness.
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