Bond Rod Mill Work Index Equipment & Apparatus Review
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: 1. mill inside diameter of 12 …
(PDF) Power-based comminution calculations using Ausgrind
databases which included JKDWT and Bond rod a nd ball mill work indices (Ma rks et al., 2001). For design of the circuit, the authors use d the FL in-house mill selec tion criteria.
Calculate Top Ball Size of Grinding Media
Although it was developed nearly 50 years ago, Bond's method is still useful for calculating necessary mill sizes and power consumption for ball and rod mills. This paper discusses the basic development of the Bond method, the determination of the efficiency correction factors based on mill dimensions and feed characteristics, and the …
Comparison of Ore Hardness Measurements for Grinding Mill …
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 …
Bond Work Index
The rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing 12.7 ... Ball mill design requires a Bond work index, BWi, for ball mills at the correct passing size; SAG mill design requires an appropriate SAG test, for …
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: W i = 62 P i 0.23 G i 0.625 10 P - 10 F kw h sh …
GMSG GUIDELINE: DETERMINING THE BOND …
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. W1 = 9.5 x [(10 / √ 1,000) – (10 / √ 19,300)] = 2.32 kWh/t
Compare and Understand Rod/Ball/Impact …
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 …
Operating work index is not the specific energy consumption
However, Bond Work Indeces are related to the type of equipment to be used (rod mill, ball mill, SAG uses Drop Ball parameter-Kwhr/m3-, so it is more complex than just specific energy consumption ...
A Method of C alculating Autogenous/ Semi-Autogenous …
No 1 rod mill/ball mill circuit was operating very effi ciently when comparing the combined operating work indices for both mills with the rod mill and ball mill laboratory work indices. Note, in Figure. 1, that the rod mill product slope is less than 0.5 due to an extra amount of nes present being fi fi ner than 650 μm.
A public Database of tumbling mill grindability measurements …
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.
Rod Mill Work Index Table
Here is a list presented in table form of Rod Mill Work Index as tested/presented by SME handbook of mineral processing, N.L Weiss Editor, N.Y. 1985. Rapid Determination of Bond Rod-mill Work Index by Craig Taylor on Scribd
Determining the Bond Efficiency of industrial grinding circuits
The Bond rod mill runs at 46 rpm, and has a revolution counter. In order to deal with material segregation at the ends, it is run in a level position for eight revolutions, tilted. 5 …
The essential grind
The Bond Ball Mill Work Index remains today as the only tool used for ball mill scale-up design. For an (only nominally, not at all materially modified) update on its use for industrial mill sizing, see …
DESIGN OF THE KUBAKA GRINDNG CIRCUIT USING SPI …
Where Wi is the work index, W is the work input (motor output) and F and P are the 80% passing sizes of the feed and product respectively, in micrometers. This relationship between feed and product energies and the calculation by difference of the required grinding energy is the basis for the two Bond Rod and Ball Mill Work Index …
GMSG GUIDELINE: DETERMINING THE BOND …
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 …
Rapid determination of Bond rod-mill work index by modeling the
The Bond rod-mill work index is used in conjunction with Bond's third theory of comminution to merely calculate net energy requirements for sizing rod-mills. This …
Ball Mills
One stage rod mill grinding is therefore suitable for preparation of feed to gravimetric ore dressing methods, certain flotation processes with slime problems and magnetic cobbing. Rod mills are frequently used as primary mills to produce suitable feed to the second grinding stage. Rod mills have usually a length/diameter ratio of at least 1.4.
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 & Maxson (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
An Overview Of the SmAll-ScAle teStS AvAilAble tO …
The Bond rod mill work index is used to calculate the power requirement to grind from ~½" to about 14 mesh. The test has been mainly used for the design of rod mills or primary ball mills, but it can also be used along with the other Bond tests (BWI and CWI) for SAG mill design using semi-empirical relationship [5]. bOnd lOw-enerGy imPAct teSt
Multi-Compartment Rod/Ball Mill Evaluation on Bauxite …
The Bond Rod Mill Work Index (BRMWI) test was only possible for Blend 5 (Table 2) due to excessive fines in the other blends. The calculated power required for the remaining blends only considered grinding the coarse fraction in the rod compartment. The Bond formula and power model were used to verify the effects of operational variables, hardness
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 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 …
Comparison of the Different Ways of the Ball Bond Work Index
D. Todorović Maja Trumić L. Andric V. Milošević Milan Trumić. Engineering, Materials Science. 2016. 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….
(PDF) Variability Study of Bond Work Index and
In the paper proposed by García et al. [5], a deep study on the Bond ball-mill and Bond rod-mill standard tests is shown with different ores. The most impacting result of this work is the ...
Bond Work Index Formula-Equation
See this useful summary Table of Bond Work Index by Minerals. For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was received crushed appropriately for the ball mill test.
Bond ≠ Ball
The Rod mill work index is one type of a Bond work index, applicable to the size range of rod milling (very roughly, 12 mm to 1 mm). The Low-energy Impact Crushing work index is another Bond work ...
Bond Work Index Tests | GSL
The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. ... GSL can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from 4.75mm to 212µm.
An Overview Of the SmAll-ScAle teStS AvAilAble tO …
The Bond rod mill work index is used to calculate the power requirement to grind from ~½" to about 14 mesh. The test has been mainly used for the design of rod mills or primary …
Bauxite grindability at elevated temperature in various mills
The Bond rod mill work indices obtained by this method were compared to those of standard Bond work indices. The comparison of both methods based on paired t -test showed that differences of mean values for the Bond work index, Wi, and the weight of the fines produced in one revolution grinding, Gi, are not significant at the 95% …
Grinding Mill Computer Model
3.2 Rod Mill Design A different approach is taken with the rod mill design where equations by Bond and Rowling are used to calculate the mill power draw. The Morgärdshammar equation and the IMM equations are shown for comparison. The method of use is similar to the AM section 3.3 Ball Mill Design