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Bond ball mill work hardness jktech steampotin. bond ball mill work hardness jktech. jktech laboratory services.jktech laboratory servicesthe standard bond rod mill work index test procedure is firstly to stage crush the feed to pass 127 mm and sie a representative sample the test then involves a series of batch grinds in a standard bond rod mill a bond rod.
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The Bond Ball Mill Work Index can be used in the design calculations and simulations of a new grinding circuit. A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample Requirements: A minimum of 10 kg of – 3.35 mm.
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The Bond ball mill work index test has been used for ore hardness characterization for more than 80 years. Nevertheless, the test suffers from significant disadvantages when compared with other characterization methods. It is expensive, labour …
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A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed.
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JK Bond Ball Mill Test Since its introduction in the 1960s, the Bond Ball Mill Work Index (BBMWi) parameter has been extensively used in predicting ball mill power draw. Use of Work Index Along with comminution circuit design the work index parameter is widely used in tracking mill performance. Due to the age and lack of controls for the test,
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The Bond Index conforming rod charge consists of: 6 rods of 1.25" diameter and 21" length. 2 rods of 1.75" diameter and 21" length. The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.
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The work index (Wi) is calculated in a laboratory-scale ball mill with Bond equation. The Bond work index has been widely used in designing full-scale mills but the Bond test is rather complex, lengthy susceptible to procedural errors and this is why attempts have been made to abbreviate and simplify Bond test procedure (Weiss, 1985).
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The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure 3.10), a question arises as to whether this practice will alter the ball mill work index (BW i) of the …
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Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond's Third Theory of Comminution, the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent to the work represented …
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standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu. (See reference 8 below). The comparison of these results gives context to how the various measurements relate to each
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Introduction of the Bond work index w i to the above equations Hard ore 18.0 1.961 Medium ore 12.0 1.290 Soft ore 6.5 0.671 Coefficients k Bond work index (w i), kWh/short ton Denver ore-hardness Table. Relationship between the Bond work index (w i) and the ore hardness designated by Denver
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SMC Data Processing. The results from conducting the SMC Test® are used to determine the drop-weight index (DWi) which is a measure of the strength of the rock as well as the comminution indices Mia, Mih and Mic. In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of ...
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Catalog excerpts. BALL MILLS, ROD MILLS & BOND INDEX MILLS Labtech Essa manufacture a range of metallurgical laboratory sized ball and rod mills to suit most applications. Included in the range is a Bond index mill which has specific application in establishing the grindability of ores (see sheet 2 of this data sheet) The ball and the rod mill ...
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Axb: JK Drop Weight Test ore hardness index BBMWi: Bond Ball Mill Work Index C i: Crushing parameter COV: Coefficient of variation DWi: Drop Weight Index DWT: Drop Weight Test E: Young´s modulus of Elasticity Ecs: Specific Comminution Energy E is: Specific input energy F 80: 80% of the feed passing : Proprietary function
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operating work index) is also presented a product of for each simulation. For Greenfield design of an AG/SAG-ball mill circuit with JKSimMet, the additional power requirement in the ball mill(s) is determined with the Bond ball mill work index and the phantom cyclone technique. COMMINUTION Trusted Bench Scale and Pilot Scale
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hardness profile of a project relates versus other projects. Figures 2 and 3 plot the Bond rod mill work index versus the Bond ball mill work index for two different projects. The first project displays a much harder tendency at medium sizes (higher WiRM than WiBM) than the database,
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Bond Ball Mill Index - JKTech The BBMWI is a measure of the resistance of the material to crushing and grinding. ... Comparison of Ore Hardness Measurements for Grinding Mill ... standard Bond crushing, and rod mill work indices, abrasion indices ... The rod mill work index is computed with an equation very similar to that of the ball ...
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Energy and grinding efficiency for both the SAG and ball mills were foremost in design considerations. A large number of ore samples were tested for hardness using the Bond work index and the MacPherson autogenous work index. Gross pinion power necessary to grind to specific sizes was estimated from the results. Electrical and mechanical losses ...
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The Bond ball mill, rod mill, and impact work indices provide industry recognised standards for the determination of ore "hardness" and "competency". The JKTech Dropweight test also provides a determination of competency and can be combined with the autoabrasion test to provide parameters for circuit modelling using JKSimmet.
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Bond ball mill work index test. Sample selection· Inquire Now; Bond Ball Mill Index Test JKTech. Measuring ore grindability in balls mills. The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. Inquire Now; bond grinding index of clinker crusherasia
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For full details, refer to the original Bond paper (Ref: Bond, F.C. 1961. "Crushing and Grinding Calculations Part I and II", British Chemical Engineering, Vol 6., Nos 6 and 8). A Bond Ball Mill Work Index test may be required for the design of a …
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At fine size (Bond ball mill work index and modified Bond tests), the bulk of the test results fall within the hard to very hard range with an average BWi of 21 kWh/t. The Bond low-energy impact test is the exception; the test uses the coarsest rocks, but the sample tested were categorized as moderately hard to hard with an average CWi of 14 ...
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Thorough sie depends entirely on the hardness of the material you are grinding and the time the ball mill is running. Details. Bond Ball Mill Index Test Jktech. The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. It can be used to determine the grinding power required for a given ...
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The Bond Ball Work Index Test determines the resistance of ore to grinding in a ball mill, expressed as a work index kilo Watt-hour per ton (kWh/t). The work index is then used to calculate the specific energy requirements for sizing ball mills or determining their throughput for a target grind. Sample Requirements: 10kg -3.35mm
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(Axb value) and ore hardness (Bond ball mill work index), including allowances for plant ramp up. Table 1 - Estimates of Maximum Plant Capacity . Ore Type Maximum Mining Rate, t/h Year 0.5 1 2 4 to 6 7 ; Hypogene 2000 2300 2550 2550 3000 Supergene 2500 2850 3167 3167 3167 Skarn 2500 2850 3167 3000 3167 ...
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Ball mill wio, bwio 8.6 circuit wio, owio 14.6 bond ball mill work index, bwi, kwht 13.4 bond rod mill work index, rwi, kwht 18.1 table 1. example of agsag ball mill circuit wio calculations 1 2 abstract optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on.
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JKTech Laboratory Services JKTech JKTech. A Bond Ball Mill Work Index test may be required for the design of a new mineral processing plant Where possible it is carried out on a sample of ore that is typical of the proposed feed to the plant The BBMWI is then used in the design calculations of the new grinding circuit.
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Safety is a prime consideration for all Alsto equipment and the Bond Index Ball Mill is supplied equipped with acoustic enclosure. The ball mill is designed to accept a ball charge in accordance with F. C Bond's standard. This ball charge consists of 286 balls as follows: 44 x 35mm balls. 67 x 30mm balls. 10 x 25.4mm balls, 71 x 19.05mm balls ...
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This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge.. Below describes in general terms the Bond Work Index Procedure used by a …
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A systematic investigation was carried out to predict Bond's work index using simple field measurable properties of rocks. Tests were conducted on Basalt, Slate and Granite using a laboratory scale ball mill and rock properties namely density, Protodyakonov's strength index and rebound hardness number were determined.
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