Home / Bonds Work Index Ball Mill Manufactuering Design And Bonds
Aug 01 2005 the bond work index is one of the most useful and interesting parameters used in designing grinding equipment however it must be obtained under restrained conditions especially in regards to the bond standard lab mill the main objective of this study is to show how this index can be obtained using a denver ball mill which is present in most mineral processing laboratories.
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Bond f c crushing tests by pressure and impact trans aime vol 169 1947 pp 5866 bond rod mill grindability test the test determines the bond rod mill work index which is used with bond’s third theory of comminution to calculate net power requirements when sizing ball mills various correction factors may have to be
21 conclusions continued in the present work equations were also derived giving zthe ballmill power drawp as a function of its dimensions internal mill diameter d and length l zthe ballmill power drawp as a function of the feed d f mm and the product size d mm the bond work index w i kwhshort ton and the mill throughput t short tonh zthe ballmill dimensions d and l when
A bond ball mill work index is then performed on the mill product for the design of sagball mill circuits this is important because it was found that there was a 115 kwht higher ball mill work index if the 335 mm ball mill test feed size is obtained
A bond ball mill 12 x 12 of fabricated construction comes with electric motor and gear reducer drive digital counter jogging button to provide positioning of drum for loading and unloading emergency stop button 44 lb ball charge stand and receiving pan perform fred c bonds grindability tests with this standard bwi test ball
Aug 01 2005 the bond work index is one of the most useful and interesting parameters used in designing grinding equipment however it must be obtained under restrained conditions especially in regards to the bond standard lab mill the main objective of this study is to show how this index can be obtained using a denver ball mill which is present in most mineral processing
Ball mill design requires a bond work index bwi for ball mills at the correct passing size sag mill design requires an appropriate sag test for example spi chapter 5 flotation design needs a valid measure of kinetics for each sample including the maximum attainable recovery and rate constants for each mineral chapter 12 take care to
Ball mill wio bwio 86 circuit wio owio 146 bond ball mill work index bwi kwht 134 bond rod mill work index rwi kwht 181 table 1 example of agsag ball mill circuit wio calculations 1 2 abstract optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have a large effect on
Bond ball mill work index figure 2 ball mill for determining bond ball mill work index 1 for the purists there were two models in existence at the time the von rittinger and kick models neither of these gave results that matched the observations of specific energy consumption from tumbling
Bond test wi’s kwht rod mill ball mill 95 kwht8 9 kwht bond standard circuit work index assume the rod mill work index of 95 applies from the actual rod mill feed sizeof 19300 m although some of this work might ideally be done by crushers to achieve a rod mill f80 of 16000 m to a rod
Bond work index value of these components mixtures is greater than the bond work index of harder components clinker oner 2000 have conducted a research of clinker and blast furnace slag mixture bond work index in different mass proportions he found out that these values are always lower than the bond index
Bondbarratt specific energy consumption sabc model this is a sag or ag mill plus ball mill model that estimates the overall circuit specific energy consumption using the classical bond work index equation for multistage crushing and singlestage ball milling e ssbm including rowland efficiency factorsthe circuit e total is equal to the e ssbm plus an inefficiency factor cf related to
Bonds work index ball mill manufactuering design and bonds milling equipment bonds work index ball mill manufactuering design and bonds a class of machinery and equipment that can be used to meet the production requirements of coarse grinding fine grinding and super fine grinding in the field of industrial grindingthe finished product can be controlled freely from 0 to 3000
Design type standard bonds work index ball mill ask price being one of the leading companies we are engaged in manufacturing providing services and supplying a wide range of ball mills our products are exclusively designed and are highly demanded by our customers these mills are easy to operate and needs low power
Determination of the bond work index using an ordinary batch ball mill al mular gv jergensen eds design and installation of comminution circuits aime new york 1982 pp 176
Effect of bond work index on ball mill design insmart bonds ballmill work index is a measure of the resistance of the material to grinding in a ball mill this index is widely used in the industry for comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill
Figure 8 rod millball mill work index ratio v unconfined compressive strength 100 200 300 400 ucs mpa 0 05 1 15 2 wirmwibm metric siddall et al 1996 identified the ratio of bond rod mill work index and ball mill work index as being indicative of an ore’s compentency figure 8 plots this ratio versus ucs no trend is apparent
First a jar mill grindability test requires a 5 lb 2 kg sample and produces a direct measured specific energy net hphrt 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
In conjunction with the bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing ag and sag mills ball mills rod mills crushers high pressure grinding rolls
In the design of a grinding circuit the work index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill 2 procedure 21 bond ball mill grindability the sample was crushed to 100 passing 6 mesh 335mm from this a 700 cc volume was measured and weighed to be used
Insmart bond’s ballmill work index is a measure of the resistance of the material to grinding in a ball mill this index is widely used in the industry for comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill
Jun 06 2015 bond work index for testing procedure cleaning and storing of ball mill charge after the bond work index procedure is done add about 500 g of silica sand into the mill containing the ball charge seal the mill rotate for 20 revolutions to clean empty the mill charge and sand into the ball try once grinding is
Mar 01 2001 wet bond milling and screening tests were carried out to avoid incomplete screening of the circulating load at fine sizes because the work index required for dry milling was greater than for wet milling in order to calculate the standard bond index the bond index obtained from wet milling had to be multiplied by
Mar 01 2003 the general characteristic of all these methods is the need for either a bond mill or a standard laboratory mill a different nonstandard method for determining the bond work index was presented using an experimental relationship between the bond work index and the mechanical and elastic properties of the material yap et al 1982 they
Micrometers in size according to the bond standard procedure the work index is determined by simulating a dry grinding in a closed circuit in the bond ball mill to achieve 250 circulating load bond 1949 1952 1961 the test is performed on a raw material approximately weighing 10 kg which coarseness is 100 3327
Mill type overview three types of mill design are common the overflow discharge mill is best suited for fine grinding to 75 – 106 microns the diaphram or grate discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 – 250 microns the centerperiphery discharge mill has feed reporting from both ends and the product discharges
Nov 01 1998 austin lg klimpel rr and luckie pt 1984 process engineering of size reduction — ball milling sme chapter 4 p76 google scholar bond fc 1952
Raw bond model this is a sag or ag mill plus ball mill model that estimates the specific energy consumption e sag using the 1979 barratt equation and the classical bond work index equation including rowland efficiency factorsthe model allows a manual calibration factor on both equations cf sag and cf ball respectivelythis formula usually gives higher total circuit specific energy
Sep 12 2019 however this requires a significant amount of ore samples a lot of labor and the pilot plants fred bond published an article in 1961 which described the procedure for testing ores for a bond ball index this parameter is still one of the most demanded tools in the design evaluation and optimization of ball grinding plants around the
Table i shows the bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after lims the concentrate weight recovery was in the order of 50–60 furthermore it may be observed that the bond ball mill work indices for
That for any ore the work index can be calculated from plant data and determined in a laboratory test fred bond is the posthumous 2015 inductee in comminution the word bond is synonymous with grinding circuit design eg bond grindability and bond work index bond’s work on circuit design occurred from the
The pilot plant sample where the ratio of rod mill work index to ball mill work index is more normal gives an optimized bondbarratt t 80 prediction of 540 m which is much closer to the survey than the lowes west sample the raw bondbarratt model also gives a
The bond work index is a measure of ore resistance to crushing and grinding and is determined using the bond grindability test its value constitutes ore characteristic and is used for industrial
The design of a ball mill can vary significantly depending on the size the equipment used to load the starting ma terial the work index of the material the mill shaft power and
The fc bond work index test ball mill was designed by f c bond for use in determining the bond index a measure of grindability and power required for grinding applications the fc bond mills are used in laboratories throughout the world a copy of fred c bond’s method of crushing and grinding for determination of the bond index is included with each
The grinding jar for the bond index rod mill is 12″ x 24″ in size and has a waveshaped design 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 21 mm whereas ball mill work
The proposed model combined with a model giving the ballmill power draw is used for the ballmill scale up comparisons with the bond procedure showed a good agreement for the prediction of the
The work index calculated from the testing can be used in the design and analysis of ball mill circuits the test requires a minimum of 10kg of sample that has been stagecrushed to 100 passing size of 335 mm any screen size below 600 m can be used for the testwork depending on your requirements bond rod mill grindability
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
Work index determination for high pressure grinding rolls cycle test akin to the bond ball mill work index determination the first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston
You need a twostage solution first stage opencircuit mill and then second stage closedcircuit mill first stage will be broken into two parts as well you use a bond rod mill work index for the coarse component of the ore 21 mm and the bond ball mill work index for the fine component 21
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