28 April 2016. Answer THREE out of the FOUR questions. Each question carried 25 marks. . Do not answer more than three questions. QUESTION 1 Comminution. A milling circuit consists of a primary SAG mill that is in open circuit. This is then followed by 2. secondary ball mills in parallel.
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of the secondary ball mill using an online ball and pulp ... industrial overflow ball mill as a function of load ... a m x m ball mill in open circuit was assumed to process a feed of ...
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Crushed ore is reclaimed from the fine ore bin and is fed into the 10′6″ diameter x 13′0″ long single stage overflow ball mill. Leaching is designed to begin in the grinding circuit by the addition of recycled barren solution for repulping. The grinding circuit is a very efficient leaching unit with violent agitation and good aeration.
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In order to investigate the breakage behavior of the feed in industrial secondary ball mills, the breakage characteristics of fine magnetite were analyzed. Magnetite particle breakage produces a bimodal particle size distribution that is consistent with the typical breakage characteristics of abrasion. The secondary ball mill can increase the surface area by reducing the diameter of steel ...
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The work index of the material is 13kWh/t, and the universal hardness is f=8~12; the working condition of the overflow ball mill is continuously feeding. Energy consumption index Under the specified standard working conditions, the ratio of the measured power to the processing capacity of the overflow ball mill is expressed in kWh/t.
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Following primary/secondary crushing, the material is processed through a rod/ball mill grinding circuit ahead of rougher/scavenger flotation that produces a copper concentrate.
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Here are some of the key features and advantages of overflow wet ball mills: Features: 1. Grinding Medium: Overflow wet ball mills use steel balls as the grinding medium. The size and type of ...
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that to get a cyclone overflow with minus say, 200 microns we must cut much finer than this. It has been agreed that the best way to describe a cyclone's cut point is the d50. This is the size of particle which has a 50:50 probability of reporting to either the underflow or overflow. Please note that the d50 cutpoint only describes the ...
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Objectives. At the end of this lesson students should be able to: Explain the grinding process. Distinguish between crushing and grinding. Compare and contrast different type of equipment and their components used for grinding. Identify key variables for process control. Design features of grinding equipment (SAG, BALL and ROD MILLS)
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secondary overflow ball mill. Introduction Overflow type ball mill is the key equipment for mineral materials secondary grinding after crushingThe feeding material size ranges from 0mm to 35mm Application It is widely applied in the industries of cement, silicate products, new building materials, refractory materials, fertilizer, etc Also suitable for nonferrous metals, ferrous metals, and ...
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The product from the SAG mill is fed to the ball mill, with the product from the ball mills being classified in cyclones. The underflow from the cyclones is recycled, with the overflow forming the feed to the flotation circuit. The milling circuit has a feed rate of 1500 t / hr. Consider two size classes, above and below 75 microns.
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Grinding mills, including SAG (semiautogenous grinding) mills and ball mills, consume approximately 6070% of the total energy cost of the entire mining operation. The mills are installed with large motors, up to 20+MW, which impart the required energy to successfully process many tonnes per hour and grind the rock to a powder size suitable ...
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AG Autogenous Grinding. The third type of mill that I mentioned was an AUTOGENOUS MILL, this type of mill uses a completely different type of grinding media; the rock itself. In conventional milling, the ore is crushed to, plus or minus, 3/8 of an inch, before it is put into a mill for grinding. In a autogenous mill the ore is fed directly into ...
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The following figure shows the assembly drawing of 2700x3600mm grate ball mill produced by Henan Deya Machinery Co., Ltd. 2700x3600mm grate ball mill. 2. Flange 4. Screw 5. Manhole 7. Quill shaft end cover 8. Combination drumscoop feeder 9. End cover liner 10.
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Large overflow ballmills allow a slurry pool to develop in the mill up to a total volume filling of 40%, to allow for discharge through the trunnion ... Interestingly, many operations have their secondary ballmills fitted with trommels, with the aperture size typically between 10 mm and 12 mm, for removal of ore and ball scats.
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the AG/SAG mill (because there is no recycle), but loads the ball mills instead. Often an existing plant that observes their SAG mill is limiting throughput, but the ball mills are underloaded can opencircuit the primary mill to better balance the grinding load with the secondary mill.
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This is then followed by 2 secondary ball mills in parallel. The product from the SAG mill is fed to the ball mills, with the product from the ball mills being combined and classified in cyclones. The underflow from the cyclones is recycled, with the overflow forming the feed to the flotation circuit. a) Draw the circuit, labelling items. (3)
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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 ...
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The secondary grinding circuits typically present circulating loads ranging from 400% to 550% . In the tracer tests, the maximum relative standard deviation of the feed flowrates to the SAG lines was %. ... Bwalya, Modeling the RTD of an industrial overflow ball mill as a function of load volume and slurry concentration. Miner. Eng ...
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The overflow type of Ball Mill is designed to overflow and discharge materials from the trunnion on the outlet side. By combining it with a mechanical classifier or wetprocessing cyclone, you are able to extensively use this type for grinding in closed circuit or for special applications such as regrinding in open circuit.
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where an approximate figure for the constant is for rod mills, for overflow ball or pebble mills and for grate discharge ball or pebble mills. ç is specific gravity of grinding media (for rods or balls normally ) q is the charge volume in fraction of mill volume (40 % = ) nc is the mill speed in fraction of critical speed
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The underflow of the secondary cyclone is recycled back to the ball mill for grinding and the final product is the overflow which goes to a flotation circuit as feed. Water is added to both sumps to facilitate the flow of the slurry smoothly within the circuit.
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The mills examined are the: airswept ball mill, roll or ball and race types of mills, airswept hammer mill, and wet overflow ball mill. The handbook is not intended to be an exhaustive guide to design and practice since separate books could be written on each system. ... Either during the processing of the mined coal or usually before the ...
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Most are overflow discharge type. ... Rod MillBall Mill Circuits Diagrams of mill circuits [image: (13582)] Rod Mill Operations. Designed to accept feed from a secondary crusher. Feed particle size = 6 25 mm. Peripheral speed = 85 146 m/min (280 480ft/m in) Reduction ratio = 2 20 depending on material. Typically R = 8.
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Product from the secondary ball mills is classified by cyclones and cyclone underflow is returned to ball mill feed and cyclone overflow reports to final product which has 80% passing 105 microns. After two stage of deslime cyclones, ore is sent for the reverse flotation to produce final product >65% iron for pallet production. ...
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Small Ball Mills Canada. We sell Small Ball Mills from 2′ to 6' (600 mm X 1800 mm) in diameter and as long as 10″ (3000 mm) in length. The mills are manufactured using a flanged mild steel shell, cast heads, overflow discharge, removable man door, spur type ring gear, pinion gear assembly with spherical roller bearings, replaceable roller bronze trunnion bearings, oil lubrication ...
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Ballmills are used widely for secondary grinding. Loveday (2010) ... The volume of pulp in some experiments was increased to mimic pulp filling in an overflow discharge ballmill. All the experiments in this phase were conducted using a silicate ore. The rate of production of material finer than 75 µm, when using a 25/75 mixture, was ...
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Simple repeatable work index tests are usually sufficient for rod mill and ball mill tests but pilot plant tests on 50100 tons of ore are frequently necessary for autogenous or semiautogenous mills. ... and one 5030 mm diameter x 8340 mm secondary ball mill driven by a 3730 kW synchronous motor. Four 1067 x 2400 mm vibrating feeders under the ...
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Overflow ball mills and grid ball mills have basically the same structure, consisting of shells, feeding ends, discharging ends, main bearings as well as drive and lubrication system. Differences ...
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The plant is set up in a mill float mill float (MF2) circuit with primary and secondary milling stages prior to primary and secondary rougher flotation respectively. The tests for this project were carried out on the secondary ball mill. The ball mill has a diameter of m and length of m (EGL) and has an overflow configuration.
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Introduction : Overflow type ball mill is the key equipment for mineral materials secondary grinding after feeding material size ranges from 0mm to 35mm. Application : It is widely applied in the industries of cement, silicate products, new building materials, refractory materials, fertilizer, etc. Also suitable for nonferrous metals, ferrous metals, and nonmetal separation.
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Original feed may be applied at the ball mill or the primary classifier. T—Tons of original feed. X—Primary circulation factor. Y—Secondary circulation factor. A—% of minus designated size in feed. B—% of minus designated size in primary overflow. C—% of minus designated size in primary sands.
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