Hardness

Bond Rod Mill Work Index Equipment & Apparatus Review

Commentary on the apparatus of the Bond rod mill Work Index

by Alex Doll
December, 2015
alex.doll@sagmilling.com

The Bond “Third Theory” of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators) were gathering the information to

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By | 2017-09-22T18:24:00+00:00 March 31st, 2016|Categories: Hardness, Laboratory Procedures, Rod Mills|Comments Off on Bond Rod Mill Work Index Equipment & Apparatus Review

Peripheral Discharge Ball Mills -Theory and Practice

These notes are based on observations made while on a recent trip through the West, for the purpose of studying the practical operation of the ball-mill. The writer takes this opportunity to express his thanks for courtesies extended at the many plants visited as well as for the valuable data received.

While there are several types of ball-mill on

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By | 2017-03-17T19:31:07+00:00 March 14th, 2016|Categories: Ball Mills, Hardness, Laboratory Procedures|Comments Off on Peripheral Discharge Ball Mills -Theory and Practice

Rock Crushing Theory and Formula using Kick & Rittinger’s Law

Rittinger’s theory and law of the energy expended in crushing of rock is that the work of crushing is proportional to the reduction in diameter; or, as I have more fully expressed it:

“The work done in crushing is proportional to the surface exposed by the operation; or, better expressed for this purpose, the work done on a given mass of rock

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By | 2017-03-19T03:48:31+00:00 March 11th, 2016|Categories: Crushing & Screening, Hardness, Laboratory Procedures|Comments Off on Rock Crushing Theory and Formula using Kick & Rittinger’s Law

Calculating DWi from Axb Drop Weight Test Results

The drop weight test is a common laboratory measurement used to determine the comminution characteristics of rock samples. A common metric derived from a drop weight test is a value “A×b”. Another common metric that is derived from the SMC Test™ variant of a drop weight test is a “Drop Weight Index”, abbreviated as DWi. This work looks

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By | 2017-03-19T05:58:43+00:00 February 1st, 2016|Categories: Crushing & Screening, Hardness|Tags: |Comments Off on Calculating DWi from Axb Drop Weight Test Results

Standard Bond Ball Mill Grindability Test Method-Procedure

Here is the old Allis-Chalmers Bond Work Index Grindability Test Procedure.

The standard feed is prepared by stage crushing to all passing a 6 mesh sieve, but finer feed can be used when necessary. It is screen analyzed and packed by shaking in a 1000-cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground dry at 250 per cent

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By | 2017-03-19T07:13:56+00:00 December 14th, 2015|Categories: Concentrator Manuals/Procedures, Grinding, Hardness|Comments Off on Standard Bond Ball Mill Grindability Test Method-Procedure

Table of Bond Abrasion Index for Varied Minerals-Materials

Table Abrasion Index of Minerals

The Bond Abrasion Test determines the Abrasion Index, which is used to determine steel media and liner wear in crushers, rod mills, and ball mills. Bond developed the following correlations based on the wear rate in pounds of metal wear/kWh of energy used in the comminution process.

Bond_Abrasion_Test_determines_the_Abrasion_Index SGS

Determining rock abrasivity in the laboratory

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By | 2017-03-19T13:08:37+00:00 October 8th, 2015|Categories: Grinding, Hardness|0 Comments

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