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(PDF) Grindability tests in heated Bond mill

to grindability testing required for the design of a plant for Adanac Moly Corp. to include SAG and Ball milling. The hardness of each sample was measured in terms of SAG power index, SPI (for SAG grinding) and Bond Ball mill work index, BWi (for ball mill grinding). A further measure, the Minnovex crusher index, Ci was also measured for use in

Authors: John Starkey, Starkey & Associates Inc. and Mike ...

The SAG Grindability Index or SAG Power Index (SPI™), The SAGDesign test. • Three Bond ball mill work index tests at different closing sizes on representative sub-samples of material crushed to -3.3 mm: The first test should be at the closing mesh size suitable to …

THE VALUE OF DAILY HIT ORE HARDNESS TESTING OF …

The generic SAG Grindability Index (SGI) and specific energy formula published by Aminpro: Amelunxen, P., Berrios, P. & Rodriguez, E. ; The SAG grindability index test, Minerals Engineering 55 (2014) Pg 42-51.

Bibliography: Specific energy consumption models ...

to grindability testing required for the design of a plant for Adanac Moly Corp. to include SAG and Ball milling. The hardness of each sample was measured in terms of SAG power index, SPI (for SAG grinding) and Bond Ball mill work index, BWi (for ball mill grinding). A further measure, the Minnovex crusher index, Ci was also measured for use in

The SAG Power index also known as the Starkey SAG Test ...

scale comminution (grindability) testing, and these test results are used to design comminution circuits. Several grindability tests have been developed for different crushing and grinding applications, and each test has its own strengths and weaknesses. Proper selection of sample(s) for grindability testing is a vital

MacPherson Autogenous Grindability Test | Mining | SGS

The test is a closed circuit, dry grindability test run in a small standard SAG mill using mill charge level control and air classification to give a minus 14 mesh product. The test is run continuously, similar to a small pilot plant, for a minimum …

Benchmarking: Yanacocha Single

2014 - The SAG Grindability Index Test - Free download as PDF File (.pdf), Text File (.txt) or read online for free.

Statement of Capabilities for Iron Ore

SAG Mill comminution test. 16 Grindability tests This is a continuous test performed in a 46 cm semi-autogenous mill with an 8% ball charge. The pilot plant consists of a feed hopper, cyclone, screen and dust collector with a control system to regulate the charge volume and circulating load.

Designing an optimal comminution sampling program for ...

The flagship SAGDesign test is the most accurate grindability test available. The SAGDesign test measures the pinion energy to grind ore from 80% passing 152 mm to 80% passing mm (W SDT).). The 2 nd stage of the test measures the Bond Ball Mill Work Index on SAG ground ore, S ore feed is prepared from a minimum of 10 kg of split or whole ...

The SAG grindability index test

The SAG variability test was selected because it more closely replicates the complex environment existing in an AG or SAG mill with its combination of abrasion and impact breakage. The problem of friable cores was not specifically addressed within this work, but the SVT allowed estimating grindability down to ~1 kwh/t from which some samples ...

Testwork: SAG grindability index

Also "Significant slurry pooling was observed in the Yanacocha SAG mill during both of the surveys." Grindability test results. Grindability measurements of survey samples are are given as: Bond ball mill work index is reported as: 17.53 kWh/t (106 µm closing screen, assume P 80 =75 µm), 16.52 kWh/t (212 µm closing screen, assume P 80 =155 µm).

sag grinding ore

The Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes. He produced a correlation between the mass of test screen undersize per …

causes of poor grindability in ball mill line mining

plan of the 130 million ton Ruby Creek orebody together with a mine plan of . hardness of each block in terms of both SAG and Ball milling with allowance for . nor does it allow for the lack of precision . to grindability testing required for the .. the grate aperture causes an increase .. harder to ball mill (BM line lower than.

The SAG grindability index test

Also "Significant slurry pooling was observed in the Yanacocha SAG mill during both of the surveys." Grindability test results. Grindability measurements of survey samples are are given as: Bond ball mill work index is reported as: 17.53 kWh/t (106 µm closing screen, assume P 80 =75 µm), 16.52 kWh/t (212 µm closing screen, assume P 80 =155 µm).

The SAG grindability index test

The SAG grindability index test. In this paper, the authors undertake a critical review of the Starkey test and the publicly available information related to the test equipment, procedures, and scale-up methodology. The following recommendations are proposed to improve the test method: 1. The test should be conducted for a fixed grinding time ...

(PDF) 8

• Mib, the "fine" size class grindability measurement in a Morrell Mi equation. Based on Morrell's re-interpretation of the results of a Bond ball mill work index test. Results from a bench-scale SAG test: • SGI, the SAG Grindability Index, the time …

causes of poor grindability in ball mill line mining

The SAG Grindability Index (SGI) test, or alternatively the trademarked SAG Power Index (SPI), is a SAG-specific test involving a small batch SAG mill that is charged with a two kilogram ore sample and ground until the product has achieved an 80% passing size of 1.7 mm.

Starkey & Associates Inc.

Dec 05, 2008· In this paper this SAG circuit dynamic model is used to test a method for detecting changes and identifying the grindability of the ore being processed by the SAG circuit. The method used — based on the variance of the continuous wavelet transform of measured circuit variables — incorporates improvements of a previous method.

Testwork: Bond ball mill work index

SAG MILL TESTING - AN OVERVIEW OF THE TEST PROCEDURES AVAILABLE TO CHARACTERIZE ORE GRINDABILITY AUTHOR: F.O. VERRET, G. CHIASSON AND A. MCKEN - SGS KEYWORDS Comminution, grindability, grinding, SAG mill, AG mill, milling, HPGR, work index, pilot plant INTRODUCTION The resistance of ore samples to breakage (or …

IMPACT ON MILL DESIGN AND FLOTATION CONTROL OF …

Dec 05, 2008· In this paper this SAG circuit dynamic model is used to test a method for detecting changes and identifying the grindability of the ore being processed by the SAG circuit. The method used — based on the variance of the continuous wavelet transform of measured circuit variables — incorporates improvements of a previous method.

Publications | Starkey and Associates Inc.

testing and design is used. SGS Minerals Services can complete the following grindability tests: • SPI (Sag Power Index) Test • Bond Ball Mill Grindability Test • Bond Impact Test • Abrasion Test • JK Drop-Weight Test • MacPherson Autogenous Grindability Test • MacPherson 18" Mill Test Well-instrumented pilot-scale autogenous

The SAG grindability index test | Request PDF

Jan 16, 2021· patented by Outotec. The SAGDesign test involves crushing an ore sample to 80% passing 19mm, and grinding it in stages in the 0.5m diameter SAG mill to measure the revolutions of the mill required to achieve a product size of 80% passing 1.7mm. The SAG ground ore is then tested using a standard Bond