Ball mills may be primary or secondary grinders. Primary grinders are fed from crushers such as a jaw crusher. Secondary grinders are fed from other grinders a rod mill. ... Ball mills may operate in a closedcircuit, or opencircuit. Closed circuits return a certain amount of the ball mill's output back to the ball mill for further size ...
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The SAG mill circuit also includes a singledeck screen and a cone crusher while the ball mill circuit utilizes hydrocyclones. ... (BGM) process plant was designed such that, after secondary ...
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The speed of mills depends upon their diameter; a ballmill of 3 feet revolves 35 times a minute, and one of 5 or 6 feet, 29 or 27 times. Tubemills run at a revolution or two faster (see Fig. 117). Some ores require much finer grinding than others to liberate the minerals, and this increases the milling cost. Ball Mill Product Classifying
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Ball Mills In all ore dressing and milling Operations, including flotation, cyanidation, gravity concentration, and amalgamation, the Working Principle is to crush and grind, often with rod mill or ball mill, the ore in order to liberate the minerals.
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The grinding circuit used for processing of gold, platinum and base metal ores typically consists of SAG primary mills, followed by ballmills. The power drawn by the ballmills is about the same as that of the SAG mill for high capacity milling circuits. Table 1 is an example of data for this type of circuit.
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As shown in Figure 3, the grinding and classifying system of Zhangzhuang iron is a traditional twostage with a closed circuit; the primary mill is MQY4060 and the secondary ball mill is MYS4060, whose parameters are shown in Table 4, with the classification equipment of both grinding stages being hydrocyclone. Hydrocyclone is gravity ...
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Sampled points for Secondary ball mill circuit Determination of Optimum Top Ball Size and Energy Requirement PSD Results Variability Particle Size Distribution Plot (PBM 1 Discharge) PBM1 Discharge (t=0) PBM1 Discharge (t=30) PBM1 Discharge (T=60) PBM1 Discharge (Averages)
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A control system to maximize water addition to the cyclone feed pump (subject to pump capacities and downstream densities constraints) is often used successfully to maximize ballmill circuit grind. The efficiency of ballmill secondary milling circuits is often evaluated by the operating work index, which is back calculated using the Bond work ...
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Analysis of particle size distribution for open and closedcircuit ball mills feed and product showed that d 90 value of feed and product of opencircuit mill is and microns ...
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Now the maximum capacity of SAG mills reached to 5000 t/h or 3537 million t/y. But unfortunately (or fortunately) this maximum achieved by precrushing. The secondary crusher has additional provisions: increased nu ball mills, increasing the size of balls in SAG mill, increasing ball load in SAG mill, etc.
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The method is referred to as 'composite secondary milling', or CSM. The method entails replacing a fraction of the volume of steel balls in ballmilling by criticalsize pebbles emanating from a SAG mill, which are normally crushed and recycled. The method was tested for milling a silicate ore (F 80 = mm, BWI = 15 kWh/t) and a platinum ...
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The effect of scats on ballmill productivity was tested and it was concluded that scats may not have an adverse effect on productivity in secondary ballmills and composite mills, if large balls are present. The use of a trommel on the ballmill is suggested to solve related problems in the classification circuit.
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This paper compares the performance of a 25/75 pebble/ball (volume ratio) composite charge to ballmilling, under conditions typical for a ballmill in SABC circuits, a large ball top size ...
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SAG mill compared to crusher and ball mill product size distributions (Powell et al 2014) ... primary gyratory crusher and then crushed in a n ope n circuit secondary crusher. T he SAG mill has pe ...
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of the SAG mill, which were mill filling, ball filling, ball size and mill speed. The AR technique graphically presented the results which indicated the best operating conditions to minimise pebble formation. The effects of mill filling on a SAG mill indicate that a higher filling produces lower pebbles.
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This simplifies to EGL = 100 000 ÷ 6741 = Round this off to a SAG mill effective grinding length of 15 feet. To compare to a vendor table, add 2 feet to con . vert the EGL to a flangetoflange length: 17 feet. Set the ball mill motor to MW, and look for a motor of a similar size in the vendor literature.
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Secondary milling to between 67 and 72% passing 75 µm, with natural fines grits. Comminution Circuit Description The KP1 plant consists of two primary ball mills converted from rod mills, which are running in parallel, and a secondary ball mill. Figure 1 shows the primary milling circuit, and Figure 2 the secondary milling
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Ball milling capacity can be justified if the incremental decrease in specific power consumption for the primary mill, for example between 500 and 1000 microns for primary mill circuit product. It is important therefore that a metallurgical engineer's judgement should be obtained in such circumstances, which is independent from any given by ...
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The reference point is a conventional ball mill circuit in closed circuit with cyclones operating at 250% circulating load and having 38% of fine material reporting to cyclone underflow, resulting in a classification efficiency of 50%. ... In mineral processing, ceramic balls have first been applied in secondary mill of the twostage grinding ...
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Balancing operating conditions between primary (SAG milling) and secondary (ball milling) stages are thus the key factor for maximizing the grinding circuit capacity [5,6,7]. Sossego Grinding Circuit. ... from the ball mill circuit feed (underflow). Accordingly, the spiral classifier underflow from the AG/SAG circuit was later homogenized ...
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Secondary grinding two Ball mills with size 31ft x 45ft, power motor 28MW (each). F80 2mm, P80 250microns. ... Cerro Verde actual data shows that the HPGR circuit energy consumption was 3 kWh/t less than the SAG/Ball mill circuit that was considered in the trade off studies. The initial trade off studies were expecting to have kWH/t of ...
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The material passing in 12 mm will feed the milling circuit consisting of the primary and secondary ball mills. Due to soft nature of the ore product from the primary mill undergoes two stages of classification. Cyclone underflow from the first stage goes to second stage cyclones, cyclone overflow from both stages are reported to the final ...
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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. The product from the SAG mil is fed to the ball mills, with the product from the ball mills being combined and classified in cyclones.
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Conical Ball Mills differ in mill body construction, ... Characterisation of Separator Efficiency in a Ball Mill Circuit 18. ... Maintaining purity of the powders is essential for avoiding the formation of a secondary phase during sintering. Wet ball or attrition milling techniques can be used for the synthesis of homogeneous powder mixture.
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