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The Bond low energy impact (crushing) work index test is specified to be performed on rock specimens between 50 mm and 75 mm in effective diameter. NQ-diameter drill core, frequently used in ...
Bond defined the work index W i as a comminution parameter which expresses the resistance of the material to crushing and grinding. The work index can be determined in two ways.
11 Crushing and classification. Estimates vary, but it is generally accepted that of all the energy used in the World something like between 1 and 10% is in comminution, i.e. the processes of crushing, grinding, milling, micronising, etc. Changing the size of the particles by crushing creates many important industrial products.
Compared with compression crushing, impact crushing will create more fines within the circuit, which will cause greater wear if processing abrasive material. This is why rocks with lower silica …
The Bond's work index of the above rock samples calculated from the Hardgrove index value has shown a variation from 7.7 to 10.3 kWh/sh.t.
Bond's work index is one of the mostly widely used metrics of mineral grindability. In spite of its ubiquity, users are often not aware of the nuances of the work index family: what are its ...
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Very important -- there are five types of work index. This equation for crushing must use the "crushing work index" and not a "ball mill work index". If the work index you were given was determined using a ball mill test, then you don't have the correct information.
For each ball mill grinding step, a Bond ball mill grindability test for Work Index at one mesh size coarser than the desired 80% passing size and at the mesh size of or just finer than the 80% passing size. If 50 mm x 75 mm (2″ x 3″) ore lumps are available an impact crushing Work Index test. If 30 mm x 20 mm (1-1/4″ x 3/4″) ore is ...
The commonly used grindability tests included in the database are the Bond work indices for ball milling, rod milling and crushing; the drop weight test results A, b, A×b, DWi, Mia, Mic, Mih and ta; SAG grindability index, SGI or SPITM; and other values such as Mib and point load index.
For tests performed at SGS laboratories, companion determination of the SPI is the CI (Crusher Index), which should not be confused with a Crushing Work Index. The CI is used as a parameter in determining the feed size of a sample in the CEET2 model, and can be thought of as an "amenability to crushing" index. Higher values indicate finer …
Crushing the tablet and rinsing it with water once resulted in an average. of 24% drug loss, depending on the crushing device used, but a second rinse with water. Fig 2. Comparison of one and two ...
A Comparison of Test Procedures for Estimating the Bond Ball Work Index on Zambian/DRC Copper-Cobalt Ores and Evaluation of Suitability for Use in Geometallurgical Studies.
THE GROWING demand for renewable fuels and changing diets in South-east Asia is driving increased investment in Australian canola-crushing facilities. Currently, Australia has a tiny canola crush capacity, estimated by USDA to sit at 1.2 million tonnes (Mt), compared to the global output predicted to be 81.1Mt in 2023-24.
The Bond low energy impact (crushing) work index test is specified to be performed on rock specimens between 50 mm and 75 mm in effective diameter. NQ-diameter drill core, frequently used in ...
the impact work index, also called Bond crushability index, continues to be much used for crusher selection. The present work shows the. application of a model that combines measurements of ...
Bond Work Index Procedure and Method. 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 …
Perhaps the key finding to emerge from his early work was that the sounds produced by chewing or crushing different foods varied in terms of their amplitude, frequency, and temporal ...
Operating efficiency: The operating efficiency com pares the operating work index of a comminution machine to the Bond work index of the ore, as deter mined from bench-scale crushing and grindability tests or pilot-plant tests.
The work indices are important for determination of crushing energy requirements and the abrasion index is important for estimating equipment metal wear and grinding media consumption. The hardness according to Mohs scale of Gibbsitic and Boehmitic bauxites are typically 1–3, while it ranges from 6½–7 for Diasporic bauxites [ 3 ].
The Bond impact crushing work index test provides the coarse size work index for the WiSTD calculation, specifically the work index of sizes coarser than 16,000 μm.
The accompanying table gives typical outputs for our range of machines, based on dry, free flowing material with a Crushing Work Index of 16 and a bulk density of 1600 kg/cu m (100 lbs/cu ft).
The finer feed size distribution for the GAL-IC ore resulted in almost halving the fSAG index, thus demonstrating an improved advantage in comparison to the traditional crushing-ball milling circuit.
Here we see the coarse fractions are not competent, the crushing work index is in the range of 5 to 10 metric units, but this ore has very high ball mill work index values, over 20 units.
Fred C. Bond made an enormous impact on the science of ore crushing and grinding with his development of the Bond Theory of Comminution and Work Index. For many years, it was the standard method for calculating the energy input necessary for crushing rock.
Table of ContentsBOND RWi, BWi, CWi, Ai Work Index: What's the differenceIntroductionRelation of Bond ball mill work index and rod mill work indexRelation of Bond ball mill work index and crushing work indexRelation of Bond rod mill work index and crushing work indexRelation of Bond abrasion index versus the work …
This result suggests that, when performing correlation studies among ore grindability and rock mechanics parameters, it is advised to use the grindability index instead of the Bond work index.
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 Pendulum Tester / Bond Impact Crushing Work Index Tester. Working principle Crushing by impact. 76 mm maximum feed size. Test repetition: At least 10, preferably 20 test runs. Adjustable crushing angle Repeatable crushing results Safe two-hand operating buttons The Bond Crushing Work Index (CWI) describes the competency of the ore at …
A quick diagnostic of whether an ore is "complex" or "simple" is to compare the three Bond work indices: "simple" ores generally have the same value for all three work index values, whereas ...
Our crushing services business is dedicated to providing world-class, tailored, build-own-operate crushing, screening and processing plants for some of the world's largest and most profitable …
The Bond low energy impact (crushing) work index test is specified to be performed on rock specimens between 50 mm and 75 mm in effective diameter. NQ-diameter drill core, frequently used in ...
This article considers one of such methods allowing determination of mill characteristics based on the Bond work indexes of crushing, rod milling and ball milling. The authors exemplify the described method application and compare the obtained estimates with the factual field test data.
Six samples were tested by Hazen Research, Inc. (HRI) to obtain the JK parameters using the JK Drop Weight Test, 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 …
For the advanced media competency test, rocks from the Rowland and Kjos competency test, ranging between –75 mm and +19 mm, are subjected to a Bond impact crushing work index determination. A rod or ball mill work index test is also carried out and the data used to determine the autogenous or semi-autogenous mill required [24].
Ore Feed Size * Work Index Hardness: Crushing & Mill Tonnage. The single most common reason for an increase or drop in the production of fines is the WORK INDEX of the ore. If you remember, the work index of the ore is a method of measuring the degree of hardness. As the ore becomes harder the fracture lines in the rock become …
The work index equation for a ball mill test was generated by Fred Bond to empirically predict the operating work index of an industrial ball mill (8 ft dia by 8 ft effective grinding length ...
