WiBM Bond Ball Mill Test Work Index (kWh/t) Wic Bond Impact Crushing Test Work Index (kWh/t) WioACT Actual Operating Bond Work Index determined from measurements on the circuit (kWh/t) WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy …Web

rod milling, is fitted to a tumbling test, referred to as the Bond rod mill work index (WiRM, or RWi). The apparatus used to determine this work index was …Web

The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. ... 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 ...Web

world. It shows that the ball mill work index is normally distributed with an average of 14.6 and a median of 14.8 kWh/t. bOnd rOd mill GrindAbility The Bond Rod Mill Grindability Test is performed similarly to the ball mill test. The feed sample is stage-crushed to ½" and the test is run under a circulating load. As inWeb

The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill apparatus. The SAGMILLING models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners". Most laboratories outside of Australia use the wave liner style of machine – these ...Web

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 ...Web

machine to the Bond work index of the ore, as deter­ ... Bond work index, Grinding, Crushing, Ball mills, Rod Mills. Theoretical efficiency In their book Process Engineering of Size Reduction - Ball Milling, Austin, Klimpel and Luckie (1984) stated that, "We have tried throughout this book to avoid the use of theWeb

The Bond rod mill work index ( Wir) is measured using Bond´s standard rod mill grindability test, which is conducted in locked-cycle mode to emulate the continuous closed-circuit operation. Besides the labor-intensive conduct of the test, which typically requires from 5 to 10 cycles for reaching steady-state, it normally requires 8–20 kg of ...Web

The Frederick C. Bond has several grinding indices (ball, rod, abrasion), one of which has been a significant guide for ball mills. The Bond ball mill work index is an expression of the material's resistance to ground and a measure of the grinding efficiency. ... that the revolutions required in all the Bond Work index mill tests conducted ...Web

This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six …Web

A Non-standard rod mill result can be converted to a Bond rod mill work index by: Bond Wi RM = 0.49 × (Wi nonstandard)^1.17 Source: Dec 2021 Public Grindability Database Bond rod mill Wi versus A×b for copper …Web

It is a well-known fact that the value of the Bond work index (wi) for a given ore varies along with the grinding size. In this study, a variability bysis is carried out with the Bond standard grindability tests on different critical metal ores (W, Ta), ranging from coarse grinding (rod mills) to fine grinding (ball mills). The relationship between wi and grinding …Web

Rod mill power is dependent on mill capacity and work index. Mill power increases with: Increasing rod charge; ... Bond quantified the rod mill power draw as a function of the Work Index, capacity, and a series of correction factors: PM = …Web

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 to eachWeb

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 …Web

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 …Web

In the Bond ball mill test, the work index is finally obtained. by. w. P Gbp PF. i = ... [Show full abstract] different characteristics of rod mill and ball mill, solving the grinding problem of ...Web

• 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 index test or the drop weight test, t/m³.Web

Using the Bond work index to measure operating comminution efficiency ... "Selection of rod mills, ball mills, pebble mills, and regrind mills," in Design and Installation of Comminution Circuits, Andrew L. Mular and Gerald V. Jergensen, eds., SME, Chapter 23, pp. 393–438.Web

Bond Work Index – Rod Mill (RWi) The Bond Rod Mill index (RWi) is a measure of the resistance of the ore to grinding to a coarse product size. Table 4 shows the RWi for each composite – note that the oxide composite was not competent enough for measurement using the RWi test, and thereforeWeb

1. Calculate the Actual Operating Bond Work Index of the grinding circuit. • Estimate the F80 and P80. • Calculate the work or specific energy input from the size reduction …Web

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.The present work proposes an alternative procedure, which …Web

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 …

Bond Rod Mill Grindability: requires 25 kg of minus ½ in. material: $950. This test determines the Bond Rod Mill Work Index, which can be used with Bond's Third Theory of Comminution to calculate net power requirements of sizing rod mills. The test is a closed-circuit, dry grindability test, is run in a standard rod mill, and can be ...Web

The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and …Web

A Bond rod mill work index test (BRMWI) is a standard test for determining the rod mill work index of an ore sample [21]. The BRMWI is a measure of the …Web

The basic work index equation is: W = 10 Wi/√P – 10 Wi/√F………………………………………………………………………… (1) where W is the …Web