# Sag Mill And Ratio Of Bond Ball And Rod Work Index

## Calculate a Mill's Operating Work Index

Calculate a Mill’s Operating Work Index As defined, this value should never exceed 100%, but in some cases – particularly in Grate Discharge Mills – it could be lower than 100% Note that this interstitial slurry does not include the overfilling slurry derived from the difference between the Charge and Ball Filling

## Bond Work Index Formula-Equation - 911metallurgist

## Testwork: Bond ball mill work index - SAGMILLINGCOM

## Application of Operating Work Indices in Autogenous

The apparent difference between ball mill and AG/SAG mill efficiency is an artefact of Bond’s implicit assumption that the particle size distributions can be defined by one point, the 80% passing size In fact, Bond noted that this convenient assumption was valid only in cases where the cumulative particle size distributions were roughly parallel

## Testwork: Bond rod mill work index - SAGMILLINGCOM

Rod mill work index is used in the SAGMILLINGCOM Bond/Barratt specific energy consumption model The work index is used to calculate the energy requirement to grind rocks in the medium size range, from 10 mm - 20 mm down to about 2 mm

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

using Bond rod mill work index (RMWI), and Bond ball mill work index (BMWI) However, the author has developed a relationship between the Bond third theory SE values and the AG/SAG SE values to enable the additional power required for AG/SAG milling to be determined AG/SAG inef ciency varies according to the transfer size ﬁ

## Comparison of UCS to Bond Work Indices

FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 05 1 15 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 UCS; no trend is apparent

## Orway Mineral Consultants Canada Ltd Mississauga, ON

the final product size The prediction of the SAG mill transfer size used in the formula is made by comparison with pilotplant data and operating plant data for similar ore types (Barratt, 1989) The approach acknowledges grinding efficiency as the ratio of operating work index to that for a single-stage ball mill

## SAG Mill Testing - Test Procedures to Characterize Ore

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 should be with both the rod mill and ball mill …

## Mill (grinding) - Wikipedia

SAG is an acronym for semi-autogenous grinding SAG mills are autogenous mills that also use grinding balls like a ball mill A SAG mill is usually a primary or first stage grinder SAG mills use a ball charge of 8 to 21% The largest SAG mill is 42' (128m) in diameter, powered by a 28 MW (38,000 HP) motor

## GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY OF

two Results of Bond ball mill tests conducted with closing screens of 75 µm or finer are to be treated with caution The Bond Work Index relationship has been noted to apply down to approximately 70 m, and perhaps no finerµ , without making qualifications Calculations: First, calculate the actual Operating Work Index, WloACT-, of the

## GeolabsGlobal | South Africa | Comminution

The work index is then used to calculate the specific energy requirements for sizing rod mills or determining their throughput for a target grind Sample Requirements: 15kg -125mm The Bond Ball Work Index Test determines the resistance of ore to grinding in a ball mill, expressed as a work index kilo Watt hour per ton (kWh/t)

## Bond Rod Mill Work Modified - tenutadelgustobe

Testwork: Bond rod mill work index - SAGMILLINGCOM 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 apparatusThe SAGMILLINGCOM models expect a mill with a "wave liner", and is not compatible with mills …

## Testwork: Bond abrasion index - SAGMILLINGCOM

The Bond Abrasion Index is a measure of how readily a rock sample will wear away steel that comes into contact with it It is conventionally used to estimate the liner and media wear rate in rod mills, ball mills and crushers This is a batch test and returns a result in units of grams (the amount of metal that wears off the test coupon)

## AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill

Ball Mill Design A survey of Australian processing plants revealed a maximum ball mill diameter of 524 meters and length of 884 meters (Morrell, 1996) Autogenous mills range up to 12 meters in diameter The length-to-diameter ratios in the previous table are for normal applications For primary grinding, the ratio could vary between 1:1and 18:1

## SAGMILLINGCOM : Home

Sagmilling is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations Grinding circuit design tools, including for SAG mill-ball mill circuits, and geometallurgy energy models are available to subscribers

## A quick method for bond work index approximate value

The Bond work index, Wi, is defined in a Bond ball mill on the samples of standard size − 3327 + 0 mm

## bond work index ball mill - monalieu

Bond Ball Mill Work Index, BWi, kWh/t 134 Bond Rod Mill Work Index, RWi, kWh/t 181 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 Get price

## MODELING THE SPECIFIC GRINDING ENERGY AND BALL …

zFrom the distribution of the points around the line of comparison the good agreement of the results received is obvious 0 200 400 600 Ball mill power draw predicted from the Denver slide rule, kW 0 200 400 600 Calculated ball-mill power draw from the m odel derived, kW Data compared Line y=x Fig

## JK Drop Weight Test | JKTech

For diamond drill core samples, the core must be un-split and have a diameter of at least 50 mm Slightly more material is preferred if Bond Rod Mill and/or Ball Mill work index testing is also required

## A Method of Calculating Autogenous/Semi-Autogenous

In 1991 the Canadians developed the SAGPower Index (SPI), test using 2 kg of material in a 300 mm diameter mill This test has been further developed by Starkey, Hindstrom and Orser (2006) This test now includes a Bond Ball mill work index test

## Bond Work Index - an overview | ScienceDirect Topics

The rod mill work index stoneoratory 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 standard, 14 mesh; see Chapter 4 for definition of mesh), thus determining the rod mill work index (Wi R or RWi) The ball mill work index stoneoratory test is conducted …

## A Method of Calculating Autogenous/Semi-Autogenous

In 1991 the Canadians developed the SAGPower Index (SPI), test using 2 kg of material in a 300 mm diameter mill This test has been further developed by Starkey, Hindstrom and Orser (2006) This test now includes a Bond Ball mill work index test

## AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill

Ball Mill Design A survey of Australian processing plants revealed a maximum ball mill diameter of 524 meters and length of 884 meters (Morrell, 1996) Autogenous mills range up to 12 meters in diameter The length-to-diameter ratios in the previous table are for normal applications For primary grinding, the ratio could vary between 1:1and 18:1

## Mill (grinding) - Wikipedia

SAG is an acronym for Semi-Autogenous Grinding SAG mills are autogenous mills but use grinding balls like a ball mill A SAG mill is usually a primary or first stage grinder SAG mills use a ball charge of 8 to 21% The largest SAG mill is 42' (128m) in diameter, powered by a 28 MW (38,000 HP) motor

## SAGMILLINGCOM : Home

Sagmilling is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations Grinding circuit design tools, including for SAG mill-ball mill circuits, and geometallurgy energy models are available to subscribers

## Tubular Rod Mills - ScienceDirect

The internal diameter and length of a dry rod mill measured 274 m × 36 m, respectively The mill was loaded to 40% of its internal volume with rods weighing 361 t The density of the rod material was 78 t/m 3 The work index of the material to be ground was estimated in a stoneoratory as 128 kWh/t

## RoM BALL MILLS - A COMPARISON WITH AG/SAG MILLING

SAG mills SAG mills are normally operated with ball loads ranges from 5 – 18 % volumetric filling while RoM ball mills are operated with ball loads ranging between 25 and 40% volumetric filling

## SAGMILLINGCOM : Articles

Effect of core diameter on the Bond impact crushing work index test The Bond low energy impact (crushing) work index test is specified to be performed on rock specimens between 50 mm and 75 mm in effective diameter

## Grinding mills – Energy efficient solutions to maximize

liming offers AG mills, SAG mills, ball and pebble mills, and stirred mills to your needs By continuing to use the site, you agree to the use of cookies You can find out more by reading our cookie policy By continuing to use the site, you agree to the use of cookies You can find out more by …

## SAGMILLINGCOM

Grinding Circuit Modelling Documentation This documentation describes the operating and underlying mathematics of the SAGMILLINGCOM grinding circuit modelling program It is intended to be used by the model users who want to operate and understand the functioning of grinding models

## Geometallurgy - Wikipedia

The Bond ball mill work index test is thought to be additive because of its units of energy; nevertheless, experimental blending results show a non-additive behavior [18] The SPI(R) value is known not to be an additive parameter, however errors introduced by block kriging are not thought to be significant

## Comments of Sag Mill And Ratio Of Bond Ball And Rod Work Index

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