Estimation methodology for Bond ball mill work index …
The Bond ball mill work index test is a standard procedure to determine the ore grindability in function of specific energy (kWh/ton). ... Impure minerals, Limestone (98% CaCO 3), fluorite (75% CaF 2), copper ore (2.5% Cu), and hematite (19% Fe) ores were used to run the tests. Initially, the sample (20 kg) is crushed to , passing at 3.327 ...
SAG Mill Testing
Table 1 – Summary of Grindability Test Procedures 1Weight requested for the test, for typical ores (S.G. = 2.8g/cm3). Denser samples require more weight, proportional to the S.G. 2Approximate weight consumed in the test for typical ores (S.G. = 2.8g/cm3). 3Minimum whole core size required for a complete test. Partial results can sometimes be ...
SAG MILL TESTING
Several grindability tests were developed over the years to design grinding circuits or optimize existing operations. Each test has its own strengths and weaknesses and it is imperative to select the proper test procedure(s) to meet project deliverables and minimize the risk of a project. Pilot plant testing of large bulk samples historically constituted the traditional approach for AG or …
Ore Grindability
The relative grindability is the ratio of the ore to be tested to the standard ore with known grindability under the same test method and test conditions, with limestone usually used as the standard medium hard ore. Absolute grindability is the grindability value of the ore measured under the specified test method and test conditions.
Effect of process mineralogy on grindability – A case study …
e e ect of mineralogy on the grindability was investigated using three copper ores – two sulphides and one oxide. e dominant copper minerals were identi ed by optical …
Ore Grindability
Ore grindability is mainly used to calculate and select the specifications, models, processing capacity, and number of grinding mills, and to determine whether the grinding mills …
Geometallurgical characterization of South Georgian …
each ore type was determined according to the standard Bond grindability test (Bond, 1961). Chemical and mineral composition of the ore types The copper and gold contents of the six samples range from 0.28 to 0.77% Cu and 0.19 to 0.75 ppm Au. The main copper minerals are chalcopyrite, and chalcocite-group minerals, which have the general ...
Effect of mineralogy on grindability
Ghanei (2020) investigated the relationship between ore texture and grindability in a variety of iron ores. Their work ignited the interest of the authors of this study to advance the understanding of the relationship between ore mineralogy and grindability using a copper deposit that contains multiple mineralized zones as a case study.
Using Rock Geomechanical Characteristics to Estimate Bond …
The second purpose is to estimate ore samples' geomechanical properties and Bond work index, as an indicator of grindability, for an extraction bench in the Sungun …
An Overview Of the SmAll-ScAle teStS AvAilAble tO …
The hardness of ore samples is measured through grindability testing. Several grindability tests, at various scales, have been developed over the years for different applications, from …
Grindability of binary ore blends in ball mills
The composition of the hold up and final product from the tests with blends involving mixtures with basalt and copper ore has been analyzed by partially dissolving the limestone phase, leaving an insoluble residue, from which the basalt and copper ore contents were estimated. ... The Bond ball mill grindability test is conducted as to reach 250 ...
Variability of the Ball Mill Bond's Standard Test in a Ta Ore …
There is no doubt about the practical interest of Fred Bond's methodology in the field of comminution, not only in tumbling mills design and operation but also in mineral raw materials grindability characterization. Increasing energy efficiency in comminution operations globally is considered a significant challenge involving several Sustainable Development …
A Comparison of Test Procedures for Estimating the
The Bond ball work index is widely used in the field of minerals processing as an indicator of ore grindability. The work index is determined by means of a locked-cycle test procedure that typically requires seven to eight cycles to stabilise at a re-circulating load of 250%. A typical test requires between three to four kilogram of ore sample and around eight hours of operator …
A new methodology to obtain a corrected Bond ball mill …
Samples of dacite and basalt from Serbia, copper ore from a South American meta-sedimentary copper mine, and copper porphyry ore from Canada, of different feed sizes, …
Effect of process mineralogy on grindability – A case study of copper …
PDF | On Apr 19, 2021, Godfrey Dzinomwa and others published Effect of process mineralogy on grindability – A case study of copper ores | Find, read and cite all the research you need on ...
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
Bond's work index model of quantifying mineral grindability was born out of the desire for a better way of scaling up laboratory grindability test results to industrial-scale grinding mills (Lynch & Rowland, 2005). The Allis-Chalmers company (now ) collected a great deal of operating and laboratory data during the 1930s
Determination of the Bond work index on samples of non …
1. Introduction. The Bond grindability test for determining the Bond work index, W i, is conducted in a Bond ball mill having the dimensions D × L = 305 × 305 mm and a speed revolution of 70 min − 1.The mill is loaded with balls from 15.5 up to 30.6 mm in diameter, having thus a total mass of 20.125 kg.. This test simulates a closed circuit of dry grinding of samples …
Secrets of the Bond Ball mill grindability test
The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work index …
Comparison of Ore Hardness Measurements for …
ABSTRACT. As part of the ongoing project development for the Tenke Fungurume Copper-Cobalt Project in the Democratic Republic of Congo, Phelps Dodge Corporation has …
SAG Mill Testing
The SAGDesign test was developed by the SAGDesign Consulting Group (Starkey, Hindstrom & Nadasdy, 2006) and consists of a batch grinding test conducted in a 0.488m diameter SAG mill. About 10kg of drill core is required for testing. The feed is prepared to 80% passing 19mm and …
Bond Grindability Test Procedure
The Bond Ball Mill Grindability test is designed to give a measure of the grinding characteristics of a material by finding the amount of size …
Standard Grindability Tests and Calculations
Tests are conducted at the mesh size to which the ore is to be ground in practice, and the cava.citv - to be expected from a given mill is calculated by the grindability with that of a similar …
Bond Work Index Procedure and Method
This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge.. Below describes in general terms the Bond Work Index Procedure used by a …
A new approach to the calculation of bond work index
et al. (1990) provided a mathematical algorithm that simulates the standard Bond test. Computer simulation is based on a mathematical algorithm. Aksani and Sönmez (2000) provided a computer simulation of the Bond grindability test that relies on a cumulative kinetic model (Ramirez-Castro and Finch, 1980).Some authors have proposed new smaller …