Geometallurgy - Wikipedia

Geometallurgy relates to the practice of combining geology or geostatistics with metallurgy, or, more specifically, extractive metallurgy, to create a spatially or geologically based predictive model for mineral processing plants. It is used in the hard rock mining industry for risk management and mitigation during mineral processing plant design. It is also used, to a lesser extent, for ...

Crushing Law And Work Index - greenrevolution.org.in

bonds crushing law and work index. 20131254 epeat steps 2 and 3 heory and Analysis The minimum energy required for crushing of the sample is smaller than it onds law is often written in terms of the work index …

Investigation into the applicability of Bond Work Index ...

Oct 15, 2015· In this study, the applicability of the Hardgrove Grindability Index (HGI) and Bond Work Index (BWI) as standard grindability tests for biomass were investigated for commercially sourced wood pellets, steam exploded pellets, torrefied pellets, sunflower pellets, eucalyptus pellets, miscanthus pellets, olive cake and Colombian La Loma coal.

DEVELOPMENT OF COMMINUTION TEST METHOD FOR …

be used to calculate Mergan work index, but this Mergan work index differs from the Bond work index. Therefore, it is needed to analyze if the Mergan work index correlates with Bond work index. All the testwork was conducted using Outotec Mergan and Bond ball mills at Outotec Research Center, located in the city of Pori, Finland.

CPE: Lesson 15. Empirical laws of Size Reduction

The Bond Work Index is material specific and is obtained from laboratory crushing tests on the feed material. Hard and brittle materials have a work index in the range 4 × 10 4 − 8 × 10 4 J/kg. Bond's law holds reasonably well for a variety of materials undergoing coarse, medium and fine size reduction. (Eq. 14.3a) can also be reduced to

MECHANICAL OPERATION LAB MANUAL - WordPress.com

To determine the energy required for crushing the given feed and thus obtain the work index for the same. Also determine the reduction ration and critical speed of the mill. THEORY: The ball mill is classified as an intermediate and fine grinder where the action of …

Bond Tests | Mining | SGS

* Bond F. C., "Crushing Tests by Pressure and Impact", Trans AIME, Vol 169, 1947, pp 58-66. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied.

FM 306: SIZE REDUCTION AND SIEVING

FM 306: SIZE REDUCTION AND SIEVING ... Bonds law is often written in terms of the work index (Wi) as, Where the work index is defined as the energy required per unit mass in kWh/ton to reduce an infinitely large particles to D80 = 100 μm.

Comparison of UCS to Bond Work Indices

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

Bond Index Ball Mill / Rod Mill BT 100 XL - RETSCH

A clear definition of the required crushing capacities and the desired product quality can be precisely determined by using the Bond Index test methods. Using the Bond Index test procedures it is possible to calculate crushing / abrasion behavior of mineral samples. This knowledge is essential to define the required ball mill layout and ...

Bond Abrasion Index Test Machine - YouTube

Mar 29, 2017· The abrasion test is mainly used to assess hammer wear in an impact type crusher (e.g. a hammer mill), hence the much higher rotational speed, whereas the Bond abrasion …

11 Crushing and classification - particles.org.uk

terms. The index is defined as the energy required to crush from infinite size down to 100 µm, hence the 10 inside the brackets. Bond's Work Index values, in kWh per short ton: i.e. 2000 lbs or 907 kg, roughly follow the Moh's scale of hardness, see Table 11.1. In Summary, Kick's law …

bonds equation crushing

What is bond's law of crushing - Wiki Answers Where Kb is a constant that depends on the type of machine and on the material being crushed. To use this equation, a work index Wi is …

The Best Bond Index Funds to Buy From Vanguard and Fidelity

Jan 24, 2019· When investors mull the best index funds, Vanguard Investments usually come to mind. The investing community considers the firm to be the king of low-cost investing, and many of the best bond index funds are in the Vanguard lineup.A handful of good choices are available at other fund companies as well, primarily from Vanguard rival Fidelity Investments.

QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE …

Abstract: 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 comminution plants designing. Determining the Bond work index …

Wear and materials Wear parts application guide

Bond work index [kWh/t] Crushability [%] Los Angeles value Ai-8mm product Shatter index ... crushing applications the work hardened layer is thinner and hardness is usually around 350-500 HV. The Mn/C ratio and amount of Cr is not only relevant when it comes to the wear resis-

Bond Impact Crushing Work Index -Procedure and Table of ...

Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond's Third Theory of Comminution, the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent to the work represented by the product – the feed.

Relationships between comminution J energy and product ...

where W is the work input (kWh/t); Wi is the work index (kWh/t) which expresses the resistance of the material to crushing and grinding; and F80 and P80 are the 80% passing size of the feed and the product ( m), respectively. Bond developed a standard laboratory test for the determination of the work index for ball and rod mills in

CORRELATION BETWEEN BOND WORK INDEX AND …

CORRELATION BETWEEN BOND WORK INDEX AND MECHANICAL PROPERTIES OF SOME SAUDI ORES Gamal S. Abdel Haffez KAU, Jeddah, KSA E-mail: [email protected] Lecturer, Mining Engineering Dept. ±Faculty of Engineering- Assiut ... The Bond work index is regarded as one of the crushing

Chemical Engineering Stop: Bond's law

May 14, 2010· Where Kb is a constant that depends on the type of machine and on the material being crushed. To use this equation, a work index Wi is defined as the gross energy requirement in kilowatt-hours per ton of feed needed to reduce a very large feed to such a …

Orway Mineral Consultants Canada Ltd. Mississauga, ON ...

MacPherson correlated Autogenous Work Index (AWi). A particle size analysis of the mill ore charge at the end of the tests provides insight into the build up of critical sized material within the mill. The AWiis used in conjunction with other Bond Work Indices (CWi, RWi, BWi) to determine power requirements using Bond's Third Law of Comminution.