what do bond mill work index tell you

Relationship between the Bond work index (w i ) and the ore hardness ...

The Ball Mill Abrasion (BMA) test was developed by the University of Queensland Materials Performance group to simulate the high stress abrasion conditions experienced in production ball mills.

XMGQ Bond Ball Mill Work Index - JXSC Machine

The Bond Ball Mill Work Index is a unique ball mill work index tester. It is used to determine the grind-ability of materials and help choose the most suitable type and grinding equipment. The grinding work index indicates the grind-ability of cement raw materials and mixtures. The principle of its measurement method is that after the materials ...

A public Database of tumbling mill grindability measurements and their ...

group as they do not have many related samples. • WiBM – The Bond ball mill work index, in metric units. • WiRM – The Bond rod mill work index, in metric units. • WiC – The Bond impact crushing work index, in metric units. • Density – The coarse particle density measured in either the Bond impact crushing work

Testwork: Bond ball mill work index - SAGMILLING.COM

The computation of a Bond ball mill work index was empirically calibrated by Fred Bond using a short ton basis. The modern (metric tonne) basis is the following equation: NI43-101 reports often provide P 100 and the work index. To estimate the other parameters, you can assume: the P 80 is 0.92 × (P 100, µm) 0.96 (see below for details)

Bond Index Testing Equipment - Abrasion, Impact & Flotation Test - RETSCH

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. The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work ...

A quick method for bond work index approximate value determination

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 ...

Modified Bond Ball Mill Work Index Test - What is this? - Grinding ...

The 1.2kg charge is milled with the standard Bond ball mill for a set time. A particle size analysis is performed on the feed and ground product, and a modified work index is calculated using a proprietary model. The Mod Bond results must be calibrated against sufficient standard Bond ball mill work indices, typically 10% of the total.

Procedure for determination of ball Bond work index in ... - ResearchGate

The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to ...

Determination of work index in a common laboratory mill

The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment. However, it must be obtained under restrained conditions, especially in regards to the Bond standard lab mill. The main objective of this study is to show how this index can be obtained using a Denver ball mill, which is present in most mineral processing laboratories. The methodology ...

Determination of work index in a common laboratory mill - ResearchGate

An analysis of the results shows a direct relationship between the Bond work index and the Denver work index when the Bond test is defined adequately to the Denver lab mill. Read more Article

Commentary on the apparatus of the Bond rod mill work index

The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond & Maxton (1943). It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load. The geometry of the grinding chamber is described as: • mill inside diameter of 12 inches

A new approach to the calculation of bond work index for finer samples ...

The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required grinding power. ... A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains. Int. J. Miner. Process., 165 (2017), pp. 8-14, 10.1016 ...

Procedure for determination of ball Bond work index in the commercial ...

A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. It was developed by Fred Bond in 1952 and modified in 1961 (JKMRC CO., 2006). This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required ...

[PDF] A quick method for Bond work index approximate value ...

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, timeconsuming and requires trained operating personnel and therefore is subjected to errors. A quick method ...

Comparison of UCS to Bond Work Indices - SAGMILLING.COM

FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 0.5 1 1.5 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore's compentency. Figure 8 plots this ratio versus UCS; no trend is apparent ...

Bond Tests | SGS Canada

Bond Ball Mill Grindability Test. The test determines the Bond Ball Mill Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements*. Various correction factors may have to be applied. W = Wi (10/√P – 10/√F) Where W = Net power consumption in kWh/t. Wi = Bond work index (either Imperial or ...

A new approach to the calculation of bond work index for finer samples ...

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 an ore characteristic. The ore resistance to grinding and energy consumption can be expressed using the work index and Bond's Third Theory.

what do bond mill work tell you - github.com

what do bond mill work tell you. In a Nutshell: Bond and Mill Levy Stand for Children. This November,many Colorado voters will be asked to approve bond and mill levies that will f

Correction of Bond Ball Mill Work Index Tests for Closing Sizes

This is because work index frequently changes as a function of the product size in comminution. If target grind size during a project is changed, or if the test is run at the wrong product size, then it is necessarily to provide a correction. The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis

Compare and Understand Rod/Ball/Impact-Crushing/Abrasion BOND Work Index

The Bond ball mill work index (Wi BM, or BWi) conducted from a feed size of approximately 2 mm to a product size on the order of 100 µm. The Bond rod mill work index (Wi RM, or RWi) conducted from a feed size of approximately 10 mm to a product size on the order of 1 mm. The Bond crushing (impact) work index (Wi C, CWi, LEIT or IWi) conducted ...

USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE

work index covering grinding of fine particles is labelled M. ib (Morrell, 2008). M. ia. values are provided as a standard output from a SMC Test ® (Morrell, 2004. a) whilst M. ib. values can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M. ic. and M. ih ...

Testwork: Bond crushing work index - SAGMILLING.COM

The Bond low-energy impact crushing work index (more informally, the Bond crushing work index) is not as common as the Bond ball mill work index, and it is a notoriously noisy test. The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus.

GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY OF INDUSTRIAL GRINDING ...

Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ mill (circuit) product size of 1,000 µm. W Total = 2.32 + 4.77 = 7.09 very large size (FkWh/t of . 9.70 ...

Using the Bond work index to measure operating ... - SpringerLink

Using the Bond work index to measure operating comminution efficiency Download PDF. Download PDF. Published: 01 ... C.A., 1978, "Determination and use of operating work indices in controlled grinding circuits–A proposed concept," Mill Operator's Conference and Exhibit, Northwestern Branch, Australasian Institution of Mining and ...

Technical Information - SMC Testing

The SMC Test® was developed to provide a range of useful comminution parameters through highly controlled breakage of rock samples. Drill core, even quartered small diameter core is suitable. Only relatively small quantities of sample are required and can be re-used to conduct Bond ball work index tests. The results from conducting the SMC ...

Bond Ball Mill Work Index (Grindability Tests) - YouTube

This video was put together by Joshua Wright and Aldo Vasquerizo as a supplemental lecture for University of Nevada Reno.If you have any questions, need advi...

Crushing Work Index and UCS - LinkedIn

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 ...

Ball mill work index adjustment - SAGMILLING.COM

The Bond ball mill work index test requires the operator to select an appropriate screen size to "close" the test. The procedure states that the closing screen size should be such that the product size of the test is the same as the expected product size of the operating plant. If the tests were done at the wrong closing screen size, then a ...

Rapid determination of Bond rod-mill work index by modeling the ...

To calculate the Bond work index ( Wi) in a standard laboratory scale rod-mill, Bond derived the following equation: (1) W i = 62 P i 0.23 G i 0.625 10 P - 10 F kw h sh t where F is 80% passing size of original feed, P is 80% passing size of circuit product and Pi is the test-sieve size in μm [1]. The standard procedure to determine all Bond ...