factors for feed size and pebble ing are applied to the AG/SAG specific energy, as well as specific crush energy adjustment from 17 mm to the mill transfer size T 80 using Bond’s Law (Starkey & Larbi, 2012) The Bond equation is used to calculate ball mill specific energy from T 80 to the final product P 80 size,

Get PriceCapacity (25% of total) Total Volume WET Working Capacity (60% of total) rpm DRY milling 60% of critical Gear & Pinnion Drive used on Larger Mills JH 3-2014 Talk with the Experts [email protected] pauloabbe _____ Since 1911 phone 6303503012 fax 6302387584 B , Ball Mill Capacity & Dimensions -2013indd

Get PriceInvestigations were carried out in a laboratory ball mill having the size of DxL = 160x200 mm with a ribbed inside surface of the drum The mill ball loading was 40% by volume, the rotation rate was equal to 85% of the critical speed Balls were made from steel: S4146, extra high quality, having hardness 62 ± 2 HRC according to Rockwell

Get Pricefurther reduced in size Water is added to the ball mill, in which a slurry that usually contains from about 20 to 55 percent solids is produced (Singh, 2010; International Mining, 2011) (see fig 2) The mill operates in a closed circuit with screens that size the ore and cyclones that sort the ore by size ,

Get Pricefeed for the rod mill, ie 10000 μm in accordance with Table The value of P 80 is accepted based on the required grain-size characteristics of the ball mill discharge Considering the Bond energy law and the correction factors by Rolland, the total specific energy E req required for comminution of mineral from the initial size F 80 (coarse

Get Priceness of the models For a given mill to have a combination of feed size, ball load, mill speed and % solids will represent the total load Ball Mill SAG Mill Scw Jb Pc % -6" +1" N/Nc Fresh Feed Water Water Pebble Crusher Screen Cyclones Sump Pump Fig 1 SABC A/B milling circuit

Get PriceA ball mill also known as pebble mill or tumbling mill is a milling machine that consists of a hallow cylinder containing balls; mounted on a metallic frame such that it can be rotated along its longitudinal axis The balls which could be of different diameter occupy 30 – 50 % of the mill volume and its size depends on the feed and mill size

Get PriceJan 02, 2017· I think you should download this spreadsheet because it offers better features that online calculation fro CheCalc The spreadsheet is simple You just input the data in dark yellow highlight; Pump sizing is calculated based on rated flow rate If you want to size based on normal flow rate, input 0 in percentage of rated flow rate

Get PriceDec 12, 2016· Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch (6350 ,

Get PriceKeywords: 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

Get Pricewas developed to assess the lost production that would result from running the mill at too high a load level It is an approximation or a best guess based on limited data This equation is: y = 225 – 194 x (1) Where x = the load in the mill expressed as measured % by volume and y = kg/h of feed

Get PriceThe specific rates of breakage of particles in a tumbling ball mill are described by the equation Si = axαi(Q(z), where Q(z) is the probability function which ranges from 1 to 0 as particle size ,

Get PriceFeed size is usually ½ inch or less; product size ranges from 500µ to below 5µ Ball mills work well on hard, brittle materials They are not as suitable for grinding elastic, ductile or fibrous materials, or for fine grinding in general Ball mills can blend and grind at the same time, yielding a fine, intimate mixture

Get PriceParticle Size distribution of all samples except mill fresh feed and scats reject was determined using 6730 to 38 µm screens Solids content of all samples was also determined Mill fresh feed particle size distribution was also determined using rod screens and laboratory screens Weight of

Get PriceHow Can I calculate new ball size and weight desing for , 4Tonnage of grinding media u can calculate on the basis of dialength and the filling degree of mill Thanks , Ball Mill Group No3 Calculation Feed capacity → Mill dimensions Filling ratio (30-45%), , How to Calculate Charge Volume in Ball or Rod Mill | ,

Get PriceA rod mill feed conveyor (4) accepts all of the ore from these feeder belts for ultimate transfer to the rod mill This conveyor is normally equipped with a weightometer (5) to monitor the flow rate of ore to the rod mill and ultimately to allow control of this flow

Get Pricethe SAG mill amounting to 512 t/h affecting mill capacity as this took space and limited the capacity for new feed Using ModSim simulator, incorporation of a 100 micron screen on the cyclone underflow stream was simulated The main purpose of the screen is to reduce the re circulating load

Get PriceNumber, size and mass of each ball size depends on mill load and whether or not the media is being added as the initial charge For the initial chargin of a mill, Coghill and DeVaney (1937) defined the ball size as a function of the top size of the feed, ie, dâ†“V = 040 KâˆšF dB = ball size (cm) F = feed size ,

Get PriceSpecial design to ball mill which will be selected on the basis of hardness, grindability index of material to be ground, feed size, particle size and hourly capacity, customized to the liner Selection of grinding ball and rod can improve grinding efficiency farthest and reduce the energy consumption

Get Priceshaft powers required to drive the mill at the specified capacity, and also to size the mill After the fabrication of the ball mill, grinding test was conducted with the mill, using limestone as the feed material This was followed by the particle size analysis of the ground product from the mill in order to determine the performance of the mill

Get Priceball mill feed having a fixed size distribution or com , This calculation indicated that a 25 inch ball would be necessary to break the largest particle of ore, 025 inch 7 Using the 25 inch ball as the maximum size, , The capacity of the feed hopper was about 100 pounds of ore The feed ,

Get Pricewhere d bmax is the maximum size of feed (mm); σ is compression strength (MPa); E is modulus of elasticity (MPa); ρb is density of material of balls (kg/m 3); D is inner diameter of the mill body (m) Generally, a maximum allowed ball size is situated in the range from D /18 to D/24 The degree of filling the mill with balls also influences productivity of the mill and milling efficiency

Get PriceThe Speeds and Feeds Calculator may be employed for calculations of estimated speeds and feeds (RPM and IPM) values on the basis of the parameters you ,

Get PriceSep 01, 2013· For the feed size of 90% passing 189 mm (Fig 6a), the maximum capacity was obtained with of a make-up ball size of 508 mm As the feed size is reduced to 134 mm, a 62:38 mix of 508 mm and 254 mm balls was found to be the optimum mix

Get PriceHigher capacity than A-G mill grinding; Primary, coarse grinding (up to 400 mm feed size) Grinding media is grinding feed plus 4-12% ball charge (ball dia100- 125 mm) High capacity (short retention time) Less sensitive to feed composition (critical size material) Semi-Autogenous Mill Note the size of the mill: Why does the diameter need to be ,

Get PriceOptimization of mill performance by using online ball and pulp measurements Soon after a stop, a mill is a dangerous place to enter for the personnel tasked with taking measurements or sampl Crash stops are difficult to handle The mill and all feed streams should be stopped simultaneously but, often, they are stopped around about the same time

Get Pricelaboratory work index of the ball mill feed, the standard Bond ball mill was implemented To estimate/predict the amount of consumed energy, and SAG mill feed hardness, Bond equation or Bond’s laboratory work index cannot be used, thus a Starkey mill was used to measure SAG mill power index [5] To determine efficiency of mills and size

Get Price127 for the rod mill and 067 for the ball mill The particle size distributions reported are shown in Figure 1 It follows that the 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 indic

Get Price2 is the 80% product passing size in 2 is the 80% feed passing size in microns 26 Plant Data Collation, Analysis and Computer Simulations Data from the month end reports of the Mine for six (6) months before the test work, were collected and collated The following plant data and parameters were collected on monthly basis and

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