2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP Ball-mill scale up Bond s Law Data zBond work index w i zFeed D f and product d size both 80 cumulative passing Result The specific grinding energy w Mill power draw P = wT where T the mill capacity Mill dimensions from Tables or charts
At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill The Rod Mill Work Index RWI is used for particle size determination in a size range from 25 mm down to 2 1 mm whereas Ball Mill Work Index BWI is used for the range from 2 1 mm down to 100 µm Adjustment of grinding parameters
Keywords Ball mills grinding circuit process control I Introduction Grinding in ball mills is an important technological process applied to reduce the size of particles which may have different nature and a wide diversity of physical mechanical and chemical characteristics Typical examples are the various ores minerals limestone etc
Jan 21 2015· bond crushing work index Liming heavy industry is specialized in the design manufacture and supply of crushing equipment used in mining industry The product range of our company comprises mobile crushing plant jaw crusher cone crusher impact crusher milling equipment ball mill vibrating feeders screens and equipment for washing sand
A quick method for the Bond work index approximate value determination which is based on the first order grinding kinetics is presented in this paper high velocity impact breakage of long
At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill The Rod Mill Work Index RWI is used for particle size determination in a size range from 25 mm down to 2 1 mm whereas Ball Mill Work Index BWI is used for the range from 2 1 mm down to 100 µm Adjustment of grinding parameters
A comparison of wear rates of ball mill grinding media pdf A comparison of wear rates of ball mill grinding media pdf ta and ball mill work index The research findings allow passing
A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill s and the associated grinding circuit s Sample Requirements A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred JKTech would stage crush the sample to minus 3 35 mm as required for the Bond Ball Mill Work Index test feed
Ball mills are industrial crushing tools that are characterized by their use of loose crushing media Ball mills are just one of many size reduction equipment varieties Ball mills along with grinding mills impact crushers and a variety of other equipment are used for the reduction of all kinds of materials for all kinds of purposes
W is the work index measured in a laboratory ball mill kilowatt-hours per metric or short ton P 80 is the mill circuit product size in micrometers F 80 is the mill circuit feed size in micrometers Rod mill A rotating drum causes friction and attrition between steel rods and ore particles
This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples These equation application methods are used to process 1 2″ ore samples in a Ball Mill using a standard ball charge Below describes in general terms the Bond Work Index Procedure used by a Professional Metallurgical Testing Laboratory If you
Bond Work Index Tests Grinding Solutions offers a range of Bond Work Index Testing from crushability and abrasion to ball and rod mills For more information on the tests please see below Bond Low Energy Impact Test The Bond Low-Energy Impact test can be used to determine the Crusher Work index CWi also known as the Impact Work Index
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The types of mills are distinguished by their working principles by pressure impact hammer or shear Mills could be equipped with a screen for grain size control and separation The FAM product range includes impact mills roller mills hammer mills ball mills and rod mills…
First 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 …
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The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100 passing 3 36 mm 6 mesh to product size in the range of 45-150 µm 325-100 mesh thus determining the ball mill work index Wi B or BWi The work index calculations across a narrow size range are conducted using the appropriate laboratory work
No 1 rod mill ball mill circuit was operating very efﬁ ciently when comparing the combined operating work indices for both mills with the rod mill and ball mill laboratory work indices Note in Figure 1 that the rod mill product slope is less than 0 5 due to an extra amount of …
First 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 …
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Describe the components of ball mill Explain their understanding of ball mill operation Explain the role of critical speed and power draw in design and process control Recognize important considerations in ball mill selection Reading Lecture In ball mills steel balls or hard pebbles to break particle based on impact and attrition
Ball mills designed for long life and minimum maintenance Metso overflow ball mill sizes range from 5 ft x 8 ft with 75 HP to 30 x 41 and as much as 30 000 HP Larger ball mills are available with dual pinion or ring motor drives Our mills incorporate many of the qualities which have made the Marcy name famous since 1913
The amount of feed was set at 1175 g which was proportional to industrial scale The ball mill speed was constantly set at 76 8 Cs Experiments were conducted at different ball sizes between 20 and 40 mm grinding time 10 30 min solids content 65 80 and work index …
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the work index depending on the grind size In this way work index values are usually obtained for some specific grind size that characterizes the grinding operation to design or under evaluation This study was carried out in a standard bond ball mill 305 mm x 305 mm size
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work indices for the AG SAG mill and ball mill can be re-organised as 7 and 8 where B Wio and A Wio are the corrected operating work indices and WAG SAG WBM are the respective power draw of AG SAG and ball mills Note that the ball mill operating work index is applied only on the portion that needs the additional grinding Q2
Oct 24 2018· The work index can either be measured in the laboratory the Bond ball mill work index determination is a common example or it can be calculated from the operating performance of …
A ball mill is a type of grinder used to grind blend and sometimes for mixing of materials for use in mineral dressing processes paints pyrotechnics ceramics and selective laser sintering It works on the principle of impact and attrition size reduction is done by impact as the balls drop from near the top of the shell A ball mill consists of a hollow cylindrical shell rotati
grindability is Bond s work index which is defined as the resistance of the material to grinding The standard equation used by them for the ball mill work index Bond work index is as follows 230 82 1 10 80 10 80 44 5 1 P G P F W i bg i u 4 In designing and optimizing a milling circuit using Bond