A denser fraction with heavy minerals having densities greater than g · cm −3 and that are of economic importance ores Detailed physical properties of these heavy media along with other less common dense organic and inorganic liquids are described in Chap 20
Definition and Function of Ore Types The fate of any rock in a mine is predetermined before the shovel touches it It has already been classified as a particular ore type a numerical tag that describes what path it will be routed on waste mill leach stockpile ore type serves as a guide to what operations will be performed how much recovery can be
Geometallurgical modeling of the production benches is an attempt to estimate the geometallurgical variables of the different ore domains which leads to a better understanding of the ore and its properties Having geometallurgical variables results in a more accurate prediction of ore characteristics an improved drilling and blasting operation and better
than average for such ores The ore irrespective of domain is unlikely to pose any significant problems with abrasiveness Comparison Sissingu Primary blend1 Bond Work Index Ball Mill BWi The Bond Ball Mill Work Index BWi is used to calculate the power requirements to grind
In general Bond s work index is used to determine the grinding efficiency and also to calculate the power requirement The process is very time consuming and it requires skilled labor and specialized mill A systematic investigation was carried out to predict Bond s work index using simple field measurable properties of rocks
Bond work indices were and kWh/t for sulphide 1 sulphide 2 and oxide ore respectively is sugges ted that the chalcopyrite rich ore is the hardest while the malachite rich
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 Below describes in general terms the Bond Work Index Procedure used by a
Bond s work index is one of the mostly widely used metrics of mineral grindability In spite of its ubiquity users typical breakage characteristic from a large and diverse data set Method it is useful to classify three types of work indices 1 A grindability measurement made in a laboratory work index apparatus such as a ball mill
The Bond rod mill grindability test is a widely used tool to estimate the response of ores to rod milling However the mass of ore required to conduct the test which can typically vary from about 8 to as much as 20 kg may represent a challenge when sample availability is present work proposes an alternative procedure which is based on the size mass
The authors compared the relationship between two indices bond work and grindability and the grinding size of different critical metal ores Results show that the grindability index is more relevant than the bond work index This work can provide guidance for the study of the correlation between ore grindability and rock mechanical parameters
INFLUENCES ON BOND WORK INDEX USING HPGR To assess the energy efficiency effect of HPGR various Bond ball mill test series were performed see also Brüggemann 2019 all of them following the stipulations of Bond The feed material for the Bond tests was a medium grained granodiorite from Kindisch Germany with a
The work indices are important for determination of crushing energy requirements and the abrasion index is important for estimating equipment metal wear and grinding media consumption The hardness according to Mohs scale of Gibbsitic and Boehmitic bauxites are typically 1 3 while it ranges from 6½ 7 for Diasporic bauxites
This paper presents significant correlations of the Bond parameter work index Wi and grindability G and the breakage parameters specific rate of breakage Si and the fineness value γ with
A schematic flowsheet of the Newman Hub is provided in Fig showing the ores from the three sources are combined into the coarse ore stockpile COS which then feeds the crushing and screening plant Blending of the three ores is an important function performed by the coarse ore stockpile as the Newman Hub only treats the blended ore
Over the years alternative procedures to the Bond grindability test have been proposed aiming to avoid the need for the standard mill or to reduce and simplify the grinding procedure Some of them use the standard mill while others are based on a non standard mill or computation techniques Therefore papers targeting to propose a better alternative claim to
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
The typical Bond work indices for ores processed in the mineral industry may vary through a range from below 10 kWh/t to over 30 kWh/t; the larger value indicating the more competent ore Type of media steel or ceramic is also important in applications where contamination of product is a problem There are three important media criteria
Definition and Function of Ore Types The fate of any rock in a mine is predetermined before the shovel touches it It has already been classified as a particular ore type a numerical tag that describes what path it will be routed on waste mill leach stockpile ore type serves as a guide to what operations will be performed how much recovery can be
Four different ore samples were acquired for the grindability experiments according to Table 1 The jaw crusher JC2000 200 × 130 mm jaw crusher Labtech Essa Pty Ltd Australia the standard Bond rod mill Labtech Essa Pty Ltd Australia and ASTM sieves ASTM Laboratory Sieves were used in the process to determine all Bond rod mill work indices
What is the Bond Work Index Formula Equation In case you had forgotten here is a classic You can read all the details of this now Biblical grinding power requirement calculation formula in Fred Bond s original You can also review the step by step Bond Work Index Test Procedure I posted See this useful summary Table of Bond Work Index
The test is an important part of the Bond work index methodology for designing and measuring In spite of being called Bonds Law the work index equations are not a law of nature; but rather an empirically Levin 1989 used to investigate fine grinding of ores and the Mib value used in the context of Mi specific energy consumption
As a fast method the determination of the Bond index from the Hardgrove index by calculation is almost matching with measured Bond s work index The Bond s work index of the above rock samples calculated from the Hardgrove index value has shown a variation from to kWh/ A correlation is found between the friability value and
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