JK Bond Ball Mill Test JKTech
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 • Grindability as indicated by the bond ball mill work index (BWi) ranged from 10–35 kWh/t, with the majority between 15 and 27 kWh/t. No clear relationships in terms A*b JKTech Technical Article
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Comparison of Ore Hardness Measurements for Grinding Mill
• SAGDesign (SAG to T80 12 M followed by Bond BM Wi on SAG ground ore) • Bond Ball Mill Work Index (Crushed Feed) • Specific Gravity (part of the The ball mill grindability test is used for describing ore hardness and it is so widespread that the Bond Work Index generated from the test is often referred to as A new methodology to obtain a corrected Bond ball mill work
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Block diagram of standard Bond test (left) and JK BBL
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...Modified Hardgrove test to predict the Bond Ball Mill Work Index (BBMWI). Predicts the BBMWI using 30 cm 3 (∼40 to 60 g) of −3.35 + 0.600 mm Development of a simplified test for the determination of the
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JKTech Comminution Analyst travels to Santiago to present paper
Since first being introduced by F Bond in 1952, the Bond Work Index, derived from the Bond Ball Mill (BBM) Test, is a measure of the resistance of the material to crushing 20 Nov 2017 After offering the JK Bond Ball Mill (JKBBM) Test in house for some years, and with over 500 tests performed, JKTech is pleased to announce the JKBBM is now available to be licenced to other JK Bond Ball Mill Test now able to be licenced to more
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JKTech Technical Article
• Grindability as indicated by the bond ball mill work index (BWi) ranged from 10–35 kWh/t, with the majority between 15 and 27 kWh/t. No clear relationships in terms A*b and/or BWi was identified with geological aspects logged from the drill core such as weathering, lithology, alteration, alteration intensity, veining or combinations of these.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. SMC Test® Minerals Processing Comminution Testing
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An Overview Of the SmAll-ScAle teStS AvAilAble tO chArActerize
world. It shows that the ball mill work index is normally distributed with an average of 14.6 and a median of 14.8 kWh/t. bOnd rOd mill GrindAbility The Bond Rod Mill Grindability Test is performed similarly to the ball mill test. The feed sample is stage-crushed to ½” and the test is run under a 100% circulating load. As in the ball millThe 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 Bond Work Index an overview ScienceDirect Topics
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A new methodology to obtain a corrected Bond ball mill work index
The “ Y ” component is given in Eq. (12) and includes the same exponent of −0.82 on the G term as is observed in the Bond ball mill grindability Eq. (10).The exponent was empirically tested against the database and found to be robust. A “raw” work index is an uncorrected work index computed using Eq.samples and perform the rod mill test on the samples blend. 2.2. Bond Ball Mill (BBM) Standard Test The procedures to carry out the Bond grindability tests in ball mills and rod mills are outlined in Sections2.2and2.3. They are usually referred to as the standard tests, but it must be highlighted that the procedures haven’t been defined byVariability Study of Bond Work Index and Grindability Index on
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Bond Work Index Procedure and Method 911 Metallurgist
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 Bond ball mill work index where BWi= Bond work index, X 1 = Rockwell hardness value, X 2 = abrasion value (gm/cm 2), X 3 = compressive strength (MPa), and X 4 = modulus of elasticity (GPa). Swain and Rao in 2009 have proposed alternative approaches for the determination of BWi [34].Using Rock Geomechanical Characteristics to Estimate Bond Work Index
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Evaluation of rock characterization tests as geometallurgical
The SAG mill circuit is designed to produce an 80% product passing size, P 80, of 200 µm for an ore hardness A*b (JKTech parameter) of 31.4. The ball mills are designed for a BWI of 13.3 kWh/t to achieve a target P 80 grind size of 90 µm. Bond ball mill work index (BWI) boxplots for the principal components analysisThe bond work index test obtained high work index 52.60 kw.h/t The grinding process in industrial ball mills is the basic unit Protodyakonov's strength index and rebound hardness numberCharacterization and Bond Work Index Determination of Low
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about smc test rev 1 911 Metallurgist
DWi and point load index (IS50) making it valuable in Mine-to-mill studies as well. For power-based calculations the SMC Test® also provides the comminution indices Mia, Mih and Mic,which are routinely reported when a test is carried out (see Table 1 below). In conjunction with the Bond ball mill work index they can be used toWiBM Bond Ball Mill Test Work Index (kWh/t) Wic Bond Impact Crushing Test Work Index (kWh/t) WioACT Actual Operating Bond Work Index determined from measurements on the circuit (kWh/t) WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy Determining the Bond Efficiency of industrial grinding circuits
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BOND'S WORK INDEX: WHAT IT IS AND WHAT IT
The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work index methodologySection snippets Material and experimental Bond tests. Samples of dacite and basalt from Serbia, copper ore from a South American meta-sedimentary copper mine, and copper porphyry ore from Canada, of different feed sizes, were used to determine the Bond ball mill work index according to the standard procedure.A standard Bond A new methodology to obtain a corrected Bond ball mill work index
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Bond Tests SGS Canada
* Bond F. C., “Crushing Tests by Pressure and Impact”, Trans AIME, Vol 169, 1947, pp 58-66. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied.Fig. 1. Ores for the work index test: a) type and b) feed size 2.2. Ball mills and operation conditions Fig. 2(a-d) shows the ball mills used in the determination of the Work Index (standard mill BBM and non-standard mills BM-1 to BM-3, all ball mills without lifters). Bond standard ball mill (Fig 2(a);Bond´s work index estimation using non-standard ball mills
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JKTech Mining Technology
JK Bond Ball Mill Test; Our flotation ore characterisation test is the JKTech Floatability Index (JKFi) Test. JK Drop Weight Test and SMC Tests® are licenced to 48 metallurgical laboratories globally. To date, over 55,000 JKTech accredited A x b tests have been completed across more than 32 different commodities.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 functionDevelopment of a methodology and validation of the Geopyörä
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AXB JK Reliability-of-Some-Ore-Characterization-Tests PDF PDF Mill
The standard Bond ball mill work index test is conducted under dry milling conditions. For ores with Bond work indexes greater than 12 kWh/t, dry locked cycle tests are suitable as they have low difference in hardness between wet and dry milling.The Bond Work Index (Wi) is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this technique is time-consuming (close to 5 hours(PDF) Variability Study of Bond Work Index and Grindability Index
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