### Application of Operating Work Indices in Autogenous ...

Bond Rod Mill Work Index, RWi, kWh/t 18.1 Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability. Mill operators have long used operating work indices to evaluate grinding circuit efficiency, with great utility. Operating work ...

### Bond Work Index Tests - Grinding Solutions Ltd

Bond Rod Mill Grindability Test. Grinding Solutions 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. Abrasion Index Test

### Rod Mill - an overview | ScienceDirect Topics

Bond had used short tons to determine work index. To convert to metric tons the factor 1.1 has been used here, (62 × 1.1 = 68.2). 2. W i conforms to the motor output on an average overflow rod mill of 2.44 m internal diameter, wet grinding in open circuit.

### Rod Mill Work Index Table - 911metallurgist.com

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.

### Bond Rod Mill Index Test | JKTech

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 circuit with a laboratory screen. Sample Requirements: A minimum of 20 kg of ...

### Mill (grinding) - Wikipedia

W is the work index measured in a laboratory ball mill (kilowatt-hours per metric or short ton) P 80 is the mill circuit product size in micrometers; 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 ...

### JKTech Laboratory Services - JKTech | JKTech

JKTech Laboratory Services Bond Rod Mill Index Test (BRMWI) A Bond Rod Mill Index Test (BRMWI) is a standard test for determining the Rod Mill Work Index of a sample of ore. The BRMWI is a measure of the resistance of the material to crushing and grinding. It can be used to determine the grinding power required for a given throughput of material under rod mill grinding consitions. JKTech Pty ...

### Testwork: Bond rod mill work index - …

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.COM 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 results can safely be used in the models. Bond rod ...

### Bond Grinding Circuit Efficiency - ceecthefuture.org

Mill Closed circuit crushing to 16 mm Open circuit 8’ dia. rod mill to 1 mm Closed circuit 8’ dia. ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK INDEX ...

### Rod Mills for coarse grinding | FLSmidth

Find the perfect Rod Mill for your low tonnage operation Our Rod Mills are designed to meet your coarse grinding needs and are available in multiple diameters, tailored to your operation. What we offer. Grind coarse feed material with a reliable Rod Mill that wont over-grind. If you are in need of an application for coarse materials like limestone, potash, coal, phosphate and bauxite, you may ...

### Rod Mills, How Do They Work? - Mine …

Rod Mills, How Do They Work? Rod mills are very similar to ball mills, except they use long rods for grinding media. The rods grind the ore by tumbling within the the mill, similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at 1.4 to 1.6. Rod mills accept feed up to about 50 mm (2 in.) and produce a ...

### Tubular Rod Mills - ScienceDirect

The rod mill feeds a wet ball mill at a feed size of 1.0 mm (1000 μm) and produces a product with 80% passing a 150 μm screen. The rod mill is in an open grinding circuit. Determine: 1. the shaft power of the rod mill, 2. the size of the industrial mill. Data: Laboratory Standard Bond Test: Rod Mill: Grindability index at 10 mesh = 13.5 kWh/t ...

### A New Approach to the Calculation of Work Index and the ...

tory rod mill and the semi continuous process using the same rod mill as described below. In all cases the min- eral sample is crushed and screened to pass a predeter- mined size 3.5 or 4 mm. The feed sample undergoes a wet screen analysis and a certain quantity, usually 0.5 - 1.0 kg, is used at each grinding test. The grinding prod- ucts are also wet screened for their size distribution. 2.1 ...

### bcl_1780574271.htm

• Bond rod mill work index • Particle crushing strength • Green balling/batch balling • Pellet compression tests • Moisture content • Pulverizing • Blaine surface area • High-temperature heating • Particle degradation tumble testing • Compression tests. Laboratory-scale Testing. Understanding mineral behavior is critical to success in moving minerals through processing to ...

### Rod Mill - The Indian Steel & Wire Products Limited

Rod Mill . ISWPL-WRM is a subsidiary unit of TATA Steel Ltd. and is one of the oldest plants in India. It was established in 1935.The Mill has a capacity to produce 220000 MT of Finished Goods per annum. ISWP Rodmill is the only mill in India which produces 6mm Fe 500D TMT Rebars. With help of M/S Shloemann AG, Germany its roughing and intermediate section was modernized in 1960 whereas in ...

### Metallurgical Testing Services | Bureau Veritas ...

Metallurgical Testing Services Our Metallurgical Division offers the Mining Industry a full range of services from bench scale testing to continuous pilot plant operation. We offer a complete metallurgical testing investigative package from the early exploration phase through scoping, pre-feasibility and feasibility to process development for flowsheet design and bankable feasibility.

### Comminution Services - SGS

determines the Bond Rod Mill Work Index which is used to determine net power requirements for sizing rod mills. The test is a closed circuit, dry grindability test, run in a standard rod mill. It can be performed at mesh sizes ranging from 4 mesh to 65 mesh. • The Bond Impact Test determines the Bond Impact Work Index which is used to calculate net power requirements for sizing crushers ...

### A Method of C alculating Autogenous/ Semi-Autogenous ...

A rod mill work index ﬁ gure was not found but was thought to be in the 16 kWh/t to 18 kWh/t range. The Xstrata Zinc 22 ft ID × 40 ft EGL over ow ball mill ﬂ was installed at Mt Isa in 2009. This mill was put into single stage service due to the installation of the original circuit, including a 32 ft SAG mill, being put on hold. This mill has been operating inefﬁ ciently due to the hard ...