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Bond Rod Index Mill, 12" x 24" consisting of a one (1) piece cast shell complete with integral wave, 1 Hp 3/60/220 volt motor/gear reducer drive, support frame which allows the mill to tilt +/- 5 degrees during operation and 45 degrees for discharge (manual operation), receiving pan, rod charge and control panel complete with digital revolution counter, start/stop buttons and emergency ...
Milling – Rod / Ball Mills including Bond Ball Work / Grindability Index . MARC manufactures a wide range of ball and rod mills to suit most metallurgical laboratory applications. Our range extends from small 6L jar-type mills that are manually positioned on rollers to large 30L size mills.
The design of rod and ball mills is still carried out with the Bond ball mill and rod mill grindability tests. As discussed earlier in this paper, it is important in this case to match the reduction size of the test to that desired from the industrial mill. As such, primary ball mills should be designed with the rod mill work index, and single ...
stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method. Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 0.5 slope when plotted on log-log paper. This is because the particle size distribution (PSD), these mills
Relationships between comminution J energy and product, determination of the work index for ball and rod mills in 1952 and modified it in 1961 The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load The standard procedural outline of the test is stated in (Bond) 1961 The work index for a ball mill, Wi, is then calculated from the ...
<100 poor =Bond Standard >100 good 7 Bond Standard Circuit: No Correction Factors • Crushing in closed circuit with screens ahead of rod milling to 16 mm • Wet, open circuit rod milling to 1mm • Wet, closed circuit ball milling to final P80 • 2.6 m inside diameter mills 8
BENCH SCALE COMMINUTION TEST WORK qBond Work Index Testing Bond Ball Work Index Bond Rod Work Index Bond Crushability Work Index Bond Abrasion Work Index qJK Tech Testing JK Drop weight Test SAG Milling Comminution Test (SMC) COMMINUTION PILOT PLANT qAG/SAG Pilot Milling Mill dimensions: Ø1.7m x 0.6m length Typical throughput 0.5 -3.5 t/h ...
F 80 is the mill circuit feed size in micrometers. Rod mill. A rotating drum causes friction and attrition between steel rods and ore particles. [citation needed] But note that the term 'rod mill' is also used as a synonym for a slitting mill, which makes rods of iron or other metal. Rod mills are less common than ball mills for grinding minerals.
The ore fed to a rod mill has a Bond Work Index of 17.5 kWht-1. The p80 of feed to the mill is 4.25 cm and the p80 of the product from the mill is 0.185mm. Calculate the work required to grind the ore to the product size as well as the reduction ratio.
Oct 03, 2015· The Titan Bond Work Index Rod Mill is one-piece cast construction with integral wave liners of a form described by Bond. This mill is used to perform the necessary metallurgical testing to determine the grinding characteristics of ores and power requirements for operating production-size rod mills.
The Bond Index conforming rod charge consists of: 6 rods of 1.25" diameter and 21" length; 2 rods of 1.75" diameter and 21" length; 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.
Comparison of UCS to Bond Work Indices Alex Doll, Alex G Doll Consulting Ltd, Edmonton, Canada Derek Barratt, DJB Consultants Inc, North Vancouver, Canada Ken Wood, Fluor Mining & Minerals, Vancouver, Canada Abstract Unconfined Compressive Strength (UCS) is a commonly used rockmass strength measurement used by
USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE ... which in conjunction with the Bond ball work index test, enable the prediction of the specific energy of comminution circuits where such circuits include combinations of any of the following equipment: AG and SAG mills Ball mills Rod mills Crushers High Pressure Grinding Rolls ...
Bond Rod Mill Index Test. Measuring ore grindability in rod mills. The Bond Rod Mill Work Index is a measure of the resistance of the material to grinding in a rod mill. It can be used to determine the grinding power required for a given throughput of material under rod mill grinding conditions. It is a 'locked cycle' test conducted in closed ...
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
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.
8.3.4. Reduction Ratio in Rod Mills. The reduction ratio, R, in rod mills varies from 2 and 20 depending on the characteristics of the ore. The usual reduction ratio is about 8. According to Bond, the reduction ratio is a function of length and diameter of the mill.
The Bond rod mill grindability test is a widely used tool to estimate the response of ores to rod milling. However, the mass of ore required to conduct the test, which can typically vary from about 8 to as much as 20 kg, may represent a challenge when sample availability is critical.
Apr 03, 2018· A reduction in the Bond ball mill work index as 1. 1 ...A method of investigating rod motion in a laboratory rod mill A method of investigating rod motion in a ... gives the effect of J in the ...
The Titan Bond Work Index Rod Mill is one-piece cast construction with integral wave liners of a form described by Bond. This mill is used to perform the necessary metallurgical testing to determine the grinding characteristics of ores and power requirements for operating production-size rod mills.
Bond's approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. The full suite of Bond comminution tests provide the Ball Mill Work Index (BWi), the Rod Mill Work Index (RWi), the Crusher Work Index (CWi) and the Abrasion Index (Ai).
Rod tangling is a problem that should be avoided by using straight rods. Rods < 6 meters are generally never straight. Rods should be 152mm shorter than mill length. Rod life is maximized of rod length-to-mill diameter is maintained between 1.4 to 1.6. Rods wear unequally with thin rod formed at the feed end and forming an elliptical shape.
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 test was originally developed in the mid 1930s by F.C. Bond.
Commentary on the apparatus of the Bond rod mill Work Index by Alex Doll December, 2015 alex.doll@sagmilling The Bond "Third Theory" of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators) were gathering the information to calibrate comminution models.
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