May has shown that the SAG/Bond Wi Ratio, that is, the SAG mill hardness (kWh/t to grind the ore from F80 152 mm to T80 1.7 mm) divided by the Bond Ball Mill Work Index (also in kWh/t) for any ore, is a key property that should be used in the design of a SAG/ball mill grinding circuit.

Sag Mill And Ratio Of Bond Ball And Rod Work Index ; Bond Work Index an overview ScienceDirect Topics. The rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing 127 mm (½ inch, the original test being developed in imperial units) to a product size of approximately 1 mm (in the original and still the …

10 mm), the crushing work index SWI is applicable; for me-dium size particles (from 100 mm to 2100 μm) — rod milling work index RWI; for finer particles — ball milling work index BWI (Table). These indexes are readily obtained using the special-purpose laboratory equipment (Fig. 1). Finding the total specific energy consumption

Unrelated 'entertaining' image. 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 ...

The metal Bond ball mill is 30.5 cm inside diameter and. 30.5 cm inside length, with rounded corners. It is smooth except for the door hole used for charging. The grinding charge consists of 285 iron or steel balls (43 @ 36.8 mm diameter, 67 @ 29.7 mm diameter, 10 @. 25.4 mm diameter, 71 @ 19.1 mm diameter, and 94 @.

A Bond Ball Mill, 12" x 12" of fabricated construction comes with electric motor and gear reducer drive, digital counter, jogging button to provide positioning of drum for loading and unloading, emergency stop button, 44 ½ lb ball charge, stand and receiving pan. Perform Fred C. Bond's grindability tests with this standard BWI test ball mill.

different grinding media of ball mills, rod mills and SAG mills. Crushing ratio Comparison. The biggest feature of SAG mills is the large crushing ratio, which can crush and grind the materials to 0.074mm at one time, accounting for more than 20% to 40% of the total product. The crushing ratio can reach 4000 ~ 5000, which is more than …

A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed.

The SAG mill product is then crushed to passing 3.35 mm and is subjected to the Bond ball mill work index (S d-BWI) grindability test to provide the total pinion energy at the specified grind size for mill design purposes, herein reffered to as micro ore hardness.

This characteristic of ball media wear rate vs the bond index was investigate at part of the AMIRA P9L project 1996-1999. It was found the systems dominated by corrosive wear mechanisms (ie: mild steel media) had wear rate in the 100-159g/kwh range and the systems that did not have corrosive wear mechanisms (Cr media or non-corrosive ores) …

2.2 Bond Ball/Rod Mill Work Index. Bond ball mill work index (BBMWI) test is a standard test used to measure the ball mill work, which is calculated in accordance with the procedure proposed by the Bond [21]. ... using the standard procedure proposed by Bieniawski and Bernede [25]. In this test, the core's height to diameter ratio …

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 …

Where, WiSTDis the Standard Circuit Bond Work Index (kWh/t) and WioACTis the Actual Operating Bond Work Index (kWh/t). • If the Wi Efficiency Ratio is 1.0 or , the …

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

The P 80 of a ball mill work index test can be estimated if the P 100 is know based on this equation: Estimate grams per revolution when only P100 is known. NI43-101 reports …

Database for all tests done to date for SAG Pinion Energy (to T80 1.7 mm) and Bond Work Index on SAG ground ore. To data 63 SAGDesign tests have been done and this allowed the Tenke ... Bond rod and ball mill work indices are readily converted to pinion energy for rod and ball mills but not for SAG mills. Reproducibility, while not …

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 …

Ball mill work index adjustment parameters, also adjustments for Morrell Mib; Laboratory tests of grindability, impact, abrasion and compression. wibm: Bond ball mill work index (sometimes called "BWI") wirm: Bond rod mill work index (sometimes called "RWI") wic: Bond crushing work index (low energy impact, sometimes called "LEIT", "IWI" or "CWI")

The working principles of a SAG mill involve the crushing and grinding process of the ore particles. As the mill rotates, the ore and grinding media are lifted and dropped, causing the ore particles to be crushed and ground. The impact between the ore and grinding media results in the reduction of the ore size.

Similar to the ball mill work index, the rod mill work index is a tumbling test that includes both attrition and abrasion breakage mechanisms. Unlike the ball mill work index, the size of the feed to a rod mill test (10 mm–12 mm) is closer to the size of the crushing test. Plotting the database of … See more

an average work index of 15.5 kWh/t. A very broad range of results was received, characterising the 'standard ore' from medium to very hard. A disappointing result considering the reliance on this test globally for design and optimisation. An improved method using less mass compared to the Bond Ball Mill Work Index test.

A "Bond" rod mill work index is to be determined in an apparatus with a wave liner. The author is aware of six laboratories that offer a rod mill work index test …

The 'pilot plant' sample, where the ratio of rod mill work index to ball mill work index is more "normal" gives an Optimized Bond/Barratt T 80 prediction of 540 µm which is much closer to the survey than the Lowes West sample. The Raw Bond/Barratt model also gives a … Ver artículo

includes a Bond Ball Mill Work Index test on SAG ground ore from the first stage of the test. The ratio of SAG pinion energy to Bond BM Wi is a key parameter in a SAG mill grinding circuit design, because this ratio controls the power split between SAG and ball mills at the target T80 transfer size( ). INTRODUCTION

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). ... The Frederick C. Bond has several grinding indices (ball, rod, abrasion), one of which has been a significant guide for ball mills. ... Mortars and ...

rock mechanics practitioners. This paper examines potential relationships between UCS and Bond Work Index values (crushing, rod mill and ball mill). Data from 11 mines …

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 …

Analysis of Bond Work Index test results for crushing, rod milling and ball milling will indicate uniformity or otherwise of breakage characteristics in different size ranges. Very often one is much higher (or lower) than the others and such variations can govern the power distribution between primary and secondary stages of grinding.

Bond Work Index an overview ScienceDirect Topics. 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 example, SPI (Chapter 5) Flotation design needs a valid measure of kinetics for each sample, including the maximum attainable recovery and rate …

operating work index) is also presented a product of for each simulation. For Greenfield design of an AG/SAG-ball mill circuit with JKSimMet, the additional power requirement in the ball mill(s) is determined with the Bond ball mill work index and the phantom cyclone technique. COMMINUTION Trusted Bench Scale and Pilot Scale