The paper by Angove Dunne (1997) reports a standard deviation in crushing work index tests across laboratories as 4.5. The laboratory CWi value of 27.4 (metric) is almost within 4.5 units of the 22.4 value I calculated, so what you are observing is probably the natural variation in the crushing test.
Crushing mill work index is used in the SAGMILLING.COM Bond/Barratt specific energy consumption model. The work index is used to calculate the energy requirement to break rocks in the coarse size range, from 100 mm down to about 10 mm - 20 mm.
Calculations involving Bonds work index are generally divided into steps with a different Wi determination for each size class. The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 mm, determining the crushing work index ( WiC, CWi or IWi (impact work index)).
Jun 19, 2015 Table of Bond Work Index by Minerals. Post navigation. Previous. Next. This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on around the world sample. You can find the SG of each mineral samples on the other table. Source 1 Source 2 Source 3 Source 3 Source 4 Source 5 Source 6 Source 6 KWh/t Source 6
Apr 07, 2020 It is not recommended to use UCS as a proxy for the Bond crushing work index, or vice versa. If you insist on doing so, there are several potential regression equations above that you may choose ...
energy impact work index (a.k.a. crushing work index) is conducted only on coarse specimens placed one at a time in the testing apparatus. With respect to the crushing work index test, F.C. Bond (1946) specifies that In the standard method of testing only broken pieces that pass a 3-in. square opening and are retained
Ammtec. Values of Bond crushing work index will vary from a 8 kWh/t for laterite hardcap through to 22 kWh/t for banded iron formation to 46 kWh/t for fresh greenstone.
bauxite crushing bond work index rock crusher and. The Crusher Work Index in kWh/ton is a function of the materials impact strength and is defined by an argillite type of rock, which has a work index of 16.5 bond crushing work index equipment.
Abstract The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial comminution plants designing. Determining the Bond work index value is quite complicated, time-
Nov 01, 1998 Rowland, C.A., 1973, Comparison of work indices calculated from operating data with those from laboratory test data, Proceedings Tenth International Minerals Processing Congress, The Institution of Mining and Metallurgy, London, UK, pp. 4761.
Jan 01, 2016 Bonds crushing work index of gypsum. 3.4. A sample of granite passing a 7.5 cm square opening screen was suspended in a Bonds pendulum test. The length of the pendulum was 413 mm and the mass of hammers is 13.6 kg each. The sample was completely crushed when the initial position of the pendulums made an angle of 30 with the vertical.
Oct 24, 2018 The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) or it can be calculated from the operating performance of a milling ...
crushability or grindability, also cal led work index and the wear profile, c alled abrasion index. 4.0 Crushing of rock and minerals Crushing is the largest process operation in ...
Crushing and Screening Handbook f METSO MINERALS Metso Minerals in brief Whether you need a single crusher, a multi- stage process or a complete plant, we assist you To be successful in todays quarry and sand and with the right design for the most cost-efective gravel operations, you need a partner to sup-
Work Index Ball Mill, alluding to the grind ability list of Metals, is utilized to demonstrate the granulating trouble of the material. It is measured by a rule that to compute the work file ball plant in light of yield of every unrest of the factory after the material is ground to an adjusted state by the predetermined plan.
Impact Crushing Work Index. The impact crushing work index mainly includes rotor speed and productivity. (1) Impact Crusher Rotor Speed. The calculation formula of impact crusher rotor speed is n60v/D, in which v refers to the linear speed of the rotor (m/s) and D refers to the diameter of the rotor (m).
Apr 07, 2020 Crushing Work Index and UCS Published on April 7, 2020 April 7, ... So this approach of segregating labs by type of apparatus wont work for the purposes of this article ...
The work index in Bonds law for crushing of solids has the following dimensions. A. No units (dimensionless) B. KWh/ton. C. KW/ton. D. KWh.m 1/2 /ton. Answer Option B.
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The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to 100% passing size of 3.35 mm. Any screen size below 600m can be used for the testwork depending on your requirements.
Hardgrove index and brittleness test can be carried out easily on only those ores or rocks or materials, which are soft, friable and brittle 1-3. Indices with which the crushing resistance or the grindability in a wide meaning is expressed include the Rittinger number, crushing resistance, Hardgrove index and Bond work index.
Indeed, by means of work index value some crushing and grinding characteristics of the taken sample were assessed by which comminution circuit would be designed much better. View full-text Article
Feb 25, 2015 Bond Work Index 10 1 1 W Power required in KWH to crush 1 short tonne ( 2000 pound) of material Wi is the work index of the material p is the 80 % passing size of the product f is the 80 % passing size of the feed 2/25/2015 65805 AM 23 24.
The work index is useful in comparing the efficiency of milling operations. A certain crusher accepts a feed of rock having diameter of 0.75 in and discharge a product of diameter 0.2 in. the power required to
MCQs The work index in Bonds law for crushing of solids has the following dimensions_____? - Chemical Engineering Mcqs - Mechanical Operations Mcqs for Chemical
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bond work index uses in gold processing - crusher in India. bond crushing work index of copper slag ... Values of Bond crushing work index will vary from a 8 kWh/t
For over 30 years, Chamney Crushing Ltd has been family owned and operated, offering aggregates for commercial and residential use. We crush our own gravel and create our own sand mixes, ensuring the finished product is of high quality and the precise consistency you need. We also provide screening, stockpiling, backhoe, dozer, and loader work.
bonds crushing law and work index. 20131254 epeat steps 2 and 3 heory and Analysis The minimum energy required for crushing of the sample is smaller than it onds law is often written in terms of the work index (Wi).
Apr 29, 2013 crushing experiments show that the capacity of a jaw crusher is dependent .. they are empirically based laws that only fit experimental data over a limited range of .. free to pass through the crushing chamber at any time, the breakage process the most utilized for jaw crushers, compressive strength and the work index. More detailed.