Density, if you recall is the ratio of ore to water and is measured as a percent of solids in the water It will control the grind in two ways It affects retention time and helps distribute the ore through-the mill so each piece of rock will come in contact with the surface of the rods To maintain a proper balance between these two is critical What water does is kind of provide a mode of ,

Sales OnlineEffect on Rod Mill Power Efficiency Because of loss of line contact between the rods, any factors which tend to increase the amount of broken rod pieces in the charge will also tend to decrease operating efficiency In cases reviewed by Bond (1960) and Rowland (1972), associated losses in efficiency were stated to be as high as 20 to 40%

Sales OnlineIMPLEMENTING STRATEGIES TO IMPROVE MILL CAPACITY AND EFFICIENCY THROUGH CLASSIFICATION BY PARTICLE SIZE ONLY, WITH CASE STUDIES N J Barkhuysen Corporation Abstract , Primary Rod Mill followed by Secondary Ball Mill Figure 4 Two Ball Mills ,

Sales OnlineThis update describes the most important findings from investigations carried out since the previous review, as well as developments in the techniques used to evaluate the grinding efficiency of rod millsRod Mill Power DrawA series of power draw versus charge level measurements were taken on the rod mills at Leg Mines Selbaie and Kidd Creek ,

Sales OnlineNov 27, 2015· Good figures for rod and bar mills are 90 % to 93 %, for structural mills, the good mill utilization figures are 75 % to 78 % If a mill rolls 80 % of the calendar year, that is 365 x 24 x 080 = 7008 hours If the mill rolls 800,000 tons per year, it runs ,

Sales OnlineFeb 01, 1992· The effects of mill feed size reduction on wet rod grinding has been studied by Strohl [2]: when the percent passing 13 mm in the mill feed was increased from 84% to 98% in rod grinding, the fineness of ground products increased from 85% to 94% passing 05 mm, while there was a 10% increase in mill capacity and a 15% decrease in wear of the rods

Sales OnlineRod Mill Coal mill Rod grinder Pin crusher Ore dressing It can make sand with high efficiency and low energy consumption and is the most advanced sand making equipment in the world performance features of rod mill in the ore grinding process, the grinding media contact the ores in a linear state, so that it has the function of selective grinding

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Sales OnlineRod Mills are particularly useful, if you run a low tonnage operation and are looking for coarse product Our Rod Mills are available in multiple diameters to fit the needs of your operation Grinding, primarily by attrition, Rod Mills require comparatively low levels of power to operate

Sales OnlineRod mill products are generally coarser than those produced in a ball mill Because of these characteristics, the rod mill has also found wide acceptance by manufacturers of fine concrete aggregates, where rigid state or federal specifications must be met Rod mills are also used extensively in the grinding of chemicals, coke, limestone, slag, etc

Sales OnlineRods are placed parallel along the length of the rod mill Rods are 150mm shorter than the mill length Breakage occurs more from cascading than cateracting The product size distribution is narrower than a ball mill but significantly coarser Most are overflow discharge type Length-to-diameter= 14 to 23 Mill length = 7 meters Rod Mill ,

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Sales OnlineThe aim of the research was to evaluate the efficiency of grinding in a drum mill dependably on the grinding media used (balls, rods) for various feed parameters - ie particle size distribution ,

Sales OnlineOleg D Neikov, in Handbook of Non-Ferrous Metal Powders, 2009 Tumbling Ball Mills Tumbling ball mills or ball mills are most widely used in both wet and dry systems, in batch and continuous operations, and on a small and large scale Grinding elements in ball mills travel at different velociti Therefore, collision force, direction and kinetic energy between two or more elements vary ,

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Sales OnlineBond Test WI’s (kWh/t): Rod Mill: Ball Mill: 95 kWh/t8 9 kWh/t Bond Standard Circuit Work Index: Assume the rod mill Work Index of 95 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ

Sales OnlineAnalysis of process of grinding efficiency in ball and rod mills with various feed parameters D Foszcz 1 , D Krawczykowski 1 , T Gawenda 1 , E Kasińska -Pilut 2 and W Pawlos 2

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Sales Online8-3 Centrifugal force outward Fc mp& 2 Dm 2 (81) & is the angular velocity, mp is the mass of any particle (media or charge) in the mill and Dm is the diameter of the mill inside the liners Gravitational force Fg mpg (82) The particle will remain against the wall if these two forces are in balance ie

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Sales Onlinedynamics in the mill gives very valuable information to the operator The evolution of media angle (βynamic) could probably help the operator to optimize the mill efficiency (plan a liner change and/or change mill speed if possible) Studying the complete evolution of the media angle (βynamic) through the liner lifetime can lead to an ,

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Sales OnlineRod mills are less common than ball mills for grinding minerals The rods used in the mill, usually a high-carbon steel, can vary in both the length and the diameter However, the smaller the rods, the larger is the total surface area and hence, the greater the grinding efficiency [5]

Sales OnlineQuantifying Grinding Efficiency Grinding If the rod mill feed will consistently be 80% passing ½" or finer, such as produced with closed circuit crushing, do not apply a rod mill inefficiency factor The other milling efficiency factors also must be applied to the calculated grinding power

Sales OnlineABSTRACT In this paper the effects of flow rate, slurry solid content, and feed size distribution on the rod mill efficiency have been investigated It is difficult to achieve highest grinding efficiency without sufficient information on operating parameters and their effects on the system Several experiments were performed on a continuous rod milling circuit Two flowsheets arrangements were ,

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