Samples were taken from the cyclone feed, overflow and underflow streams and their solid/water ratios determined as, and, respectively. Calculate the circulating load of the circuit. An iron ore company milled ore at the rate of 150 t/h in a ball mill in closed circuit with a classifier.
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[Show full abstract] modified Bond test procedure is based on using the standard Bond ball work index test but changing the circulating loads (350%, 250%, 150%, ). The comparative tests with ...
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F80 is the feed size to the primary BM; T80 is the transfer size (prim mill product size), P80 is the final product (cyclone overflow) The F80 is the feed to the primary ball mill. The T80 (is the P80 of the primary ball mill and the F80 to the secondary ball mill circuit) is measured at the pipe departing the primary ball mill.
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Introduction Comminution is defined as a process covering the size reduction activities in mining, mineral processing and in a range of other industries as well for both crushing and grinding operations of materials for different purposes, mostly size liberation.
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Contribute to crush2022/mill development by creating an account on GitHub.
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For a closed circuit ball mill flowsheet as represented in Figure 2, a simplified relationship (Equation 1) for relative capacity at different circulating load and classification efficiencies was ...
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The first function determines the number of mill revolutions N 250 % (revolutions) required to obtain the undersize mass, such that the circulating load is 250%. Based on the values of N 250 % (revolutions) and the determined functional dependencies, the parameters G (g/rev) and P 80 (μm) are estimated, and Equation (32) can be used to ...
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The adopted hydrocyclone flow split parameter was %. This indicates that % of the hydrocyclone feed returns to the mill as circulating load. Considering the new feed is equal to 482 t/h, the calculated circulating load was equal to 2, t/h, being necessary 177 iterations for the calculation.
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The calculations indicate that in order to obtain overload with smaller mills at a constant circulating load, the L/D ratios would have to increase progressively from the initial /1 value for a n diameter mill, to a /1 L/D value for a throughput reduction to 10 percent of the original value. This high an L/D ratio is without precedent.
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Based on experience acquired over the years and the investigative work conducted by Bond, it was established that the optimum circulating load for a closed ball mill cyclone circuit is around 250%. This value is used as guideline for the design of new circuits as well as to assess the performance of existing circuits.
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Based on the standard procedure defined by Bond, the ball mill work index is determined by simulating a closed cycle dry grinding in a laboratory Bond ball mill until a stable circulating load of 250% is established (Bond, 1949, Bond, 1952, Bond, 1961). The ball mill work index is determined by Eq. (10). The recommendation is the ball mill ...
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The flow rate selected at range of t/h, slurry solid content at range of 2761% and feed size distribution at range of 1230 mm. Results showed that the lowest grinding efficiency ...
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The SAG mill discharge and the overflow and underflow of both cyclone stages are the only streams that can be suitably sampled. The assay results of a sampling survey are included on the figure. If the SAG mill feed conveyor measures 250 tph solid treatment rate, calculate the circulating tonnage to the ball mill (ball mill feed).
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As a review, the Functional Performance Equation, well documented and industrially validated (McIvor 2006, Bartholomew 2014), is shown below: QQ = 䝂ꈪMM × 㻨誧CC㻨誨 × GG × 䝂ꈪ GG Where: = metric tonnes per hour of new fines (
Circulating load calculate Most factories the purpose of control Effective factors for circulating load Test design Conclusion References Slide 2 f circulating load ratio circulating load ratio : As the ratio of the amount of solids going through the ball mill divided by the amount of solids going through the circuit. Circulating load
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Ball Mill Circulating Load Mineral Processing . Pulp samples collected around the ball mill or rod mill and hydrocyclones, screen or classifier (classification system) are screened and the cumulative weight percentage retained is calculated for several mesh sizes to obtain the Ball Mill Circulating Load.
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1 Comment / downloads, Excel sheets downloads / By admin. Exclusively for Cement Process Engineers Cyclone efficiency calculator Eng Nael Shabana Cyclone efficiency checking by using Standard Efficiency Formula you will have to input Cyclone data : Entry area dimension Immersion tube dimensions: Cylindrical part dimension: Conical part ...
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A modified equation has been proposed to calculate the Bond Ball Grinding Index (BWI), that considers the ratio of the MSL14K mill net grinding power to the net grinding power of Bond ball mill.
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relationship which can be used to calculate the reduced recovery. This recovery, along with the bypassed solids, is used to predict the complete size distribution for the underflow product. R r = e 4X 1 (eq. 1) e4X + e4 2 Where R r = Recovery to underflow on corrected basis. X = Particle diameter /D50 C particle diameter.
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The relative capacity of a closed ball mill circuit as function of circulating load was calculated for three different classification arrangements: 1. cyclones with 38% of fine material reporting (bypass) to coarse product (cyclone underflow), 2. screens with 20% of fine material reporting to coarse product (screen oversize), 3.
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An iron ore company milled ore at the rate of 150 t/h in a ball mill in closed circuit with a classifier. The underflow (course) stream was recirculated to the mill till a steady value was obtained in the cyclone overflow stream. The specific gravities of each stream were measured as: a) Mill discharge stream to classifier = SG(md)
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The test is a standardized methodology that ends when a circulating load of 250% is obtained. In this paper, a new method based on the Population Balance Model (PBM) is proposed and validated to estimate the results of the Bond ball mill work index test (Wi B). The model presented in this study combines the first cycle of the Work Index test ...
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Re circulating load ratio L ; 4 4 7 4 4. If the feed stream slurry contains 35% solids by volume and 40% of the water is recycled, calculate lids in hydro cyclon roducts. Density of solid tons/m 7. an low+ volume of solid in overflow . concentration of so e p
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