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testwork

Testwork Programs That Deliver Multiple Data Sets

Mining projects are applying the age-old notion of "check your work" against comminution circuit design, mill ...[↓ read more ↓]

Alex Doll
testwork

Effect of Sample Dimensions on Comminution Testwork

Comminution tests on a particular project have displayed completely different breakage characteristics relativ...[↓ read more ↓]

Alex Doll
testwork

Comparison of UCS to Bond Work Indices

Unconfined Compressive Strength (UCS) is a commonly used rockmass strength measurement used by rock mechanics ...[↓ read more ↓]

Alex Doll
testwork

Testwork template spreadsheet

Blank spreadsheet that is pre-populated with the field names needed to import laboratory test results into the...[↓ read more ↓]

Alex Doll
testwork

Calculating DWi from a drop weight test result

The drop weight test is a common laboratory measurement used to determine the comminution characteristics of r...[↓ read more ↓]

Alex Doll
testwork

Commentary on the apparatus of the Bond rod mill work index

The Bond "Third Theory" of comminution was originally divided into three size classes reflecting the varieties...[↓ read more ↓]

Alex Doll
testwork

Database of public grindability testwork

Spreadsheet that accompanies the Procemin 2016 paper by Alex Doll. This spreadsheet contains a database of pu...[↓ read more ↓]

Alex Doll
testwork

A public database of tumbling mill grindability measurements and their relationships

This work presents a public database of over 800 grindability measurements and a set of equations for converti...[↓ read more ↓]

Alex Doll
static image

Example test database plot

Example database chart for the Subscriber Tools page...
sagmilling.com
static image

Example circuit model

Example flowsheet page of a circuit model...
sagmilling.com
modelling

Rosin Rammler Regression Spreadsheet

Spreadsheet calculation that fits the Rosin Rammler equation to a set of particle size data consisting of an a...[↓ read more ↓]

Alex Doll
modelling

Fitting a Rosin Rammler equation to a 2-value data set

Calculation provides a quick way to estimate the Rosin Rammler equation parameters by using two data values to...[↓ read more ↓]

Alex Doll
modelling

JK Ball Mill Model Notes

Review of the JKMRC Mineral Comminution Circuits textbook (Reference 1), and discussions with practitioners of...[↓ read more ↓]

Alex Doll
modelling

Sizing and Selection of Hydrocyclones

Provides a basis for first-pass hydrocyclone sizing for mineral processing applications. Method is based on Th...[↓ read more ↓]

Alex Doll
modelling

UBC MINE331 Lecture Notes

Memorandum describing the SAG mill & ball mill circuit sizing lecture delivered to the University of British C...[↓ read more ↓]

Alex Doll
modelling

Liner Effective Height

Determines the effective mill inside diameter of a given set of "top hat" lifters for use in mill volume and c...[↓ read more ↓]

Alex Doll
modelling

Liner Effective Height

Determines the effective mill inside diameter of a given set of "top hat" lifters for use in mill volume and c...[↓ read more ↓]

Alex Doll
modelling

MillFillingCalc

Backup to the Mill Filling Calculation spreadsheets that describes the geometry and mathematics....
Alex Doll
modelling

A simple estimation method of materials handling specific energy consumption in HPGR circuits

Multi-stage crushing plants, including high pressure grinding roll (HPGR) circuits, require more materials han...[↓ read more ↓]

Alex Doll
modelling

SAG power draw survey tabulation

This LibreOffice spreadsheet contains the raw data used to create Table 1 and Table 2 of the paper "An updated...[↓ read more ↓]

Alex Doll
Modelling

An updated data set for sag mill power model calibration

This paper expands the SAG mill survey database published by the Author at Procemin 2013. The new database in...[↓ read more ↓]

Alex Doll
modelling

Fine Grinding, A Refresher

Paper presented at CMP 2017. Many power-based grinding models exist, and most operators are familiar with ...[↓ read more ↓]

Alex Doll
modelling

Fine Grinding speaker notes

Speaker slides for CMP 2017 presentation "Fine Grinding, A Refresher"...
Alex Doll
mass balancing

Solving Mass Balances using Matrix Algebra

Matrix Algebra, also known as linear algebra, is well suited to solving material balance problems encountered ...[↓ read more ↓]

Alex Doll
mass balancing

Performing Metallurgical Calculations on Spreadsheets

Computerized spreadsheets are a commonly used tool in the engineering industry. Unfortunately, they are a very...[↓ read more ↓]

Alex Doll
drives

Motor Power Measurement and Efficiency Diagram

Grinding circuit power is commonly used as a defining parameter in circuit design and analysis. However, the c...[↓ read more ↓]

Alex Doll
drives

Choosing the Right Motors for your Mills

Slide presentation providing an overview of the process for selection motors for grinding mills. Motors are se...[↓ read more ↓]

Alex Doll
drives

The engineering and process effects of choosing a motor design speed

Many grinding mill owners choose a variable speed drive for their mill to cope with variations in ore hardness...[↓ read more ↓]

Alex Doll
testwork

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 5...[↓ read more ↓]

Alex Doll
modelling

Rosin Rammler Regression Spreadsheet

Spreadsheet calculation that fits the Rosin Rammler equation to a set of particle size data consisting of an a...[↓ read more ↓]

Alex Doll
modelling

Presentation at Universidad Privada del Norte, Cajamarca, Perú

Speaker slides from presentation made at the Universidad Privada del Norte, Cajamarca, Perú, November 25, 201...[↓ read more ↓]

Alex Doll, Dave Michaud