Ore grindability is represented by the Bond work index value [6] and Mucsi et al [5] have summarized the most widely known and utilized grindability tests as Bond Hardgrove and Zeisel methods [7
Bond work indices are 18 kwhr/t at 300 microns and 21 kwhr/t at 200 mesh The slightly higher iron and sulfur levels PW Overbeek and LB McRae The recovery of platinum group metals from
The bond work index test obtained high work index /t and consumed power /t to grind one ton of low grade iron ore and this attributed to the high concentration and hardness of
size distribution of each ore with which the work index was evaluated In all tests the size 80 is below 2000 µm Fig 1 Ores for the work index test a type and b feed size Ball mills and operation conditions Fig 2 a d shows the ball mills used in the determination of the Work Index standard mill BBM and
The word Bond is synonymous with grinding circuit design Bond Grindability and Bond Work Index Fred Bond s work on circuit design occurred from the late 1930s to the mid 1960s and it changed the method of design completely In the pre Bond era the prediction of the power required per tonne to grind material to a known product size was
A higher Bond work index value was found for the BHJ ore kWh/ton than for the BHQ ore kWh/ton A decrease in the product particle size was associated with an increase in the work
Bond work index and the consumed energy [6] Berry and Bruce 1966 discovered new method for determining the work index the concept of this method depended on the use of a reference ore of known work index[7] Iron ore is one of the important industrial minerals used in steel industrials Magnetite hematite and goethite are considered the
A higher Bond work index value was found for the BHJ ore kWh/ton than for the BHQ ore kWh/ton A decrease in the product particle size was associated with an increase in the work
Thus iron ore related bonds and steel markets are interrelated Analyzing the dynamic 1 spillovers and correlations between iron ore prices bond yields of related industries and steel prices aids in understanding the impact of iron ore supply and demand for related finance on steel prices
eral shows modest grindability values Thus it is worth emphasizing that the Bond work index tries to characterize the ore grinding behavior in a closed circuit encompassing the ore mechanical behavior before the mill action whatever the type of the mill and its
DOI / Corpus ID 99402495; Prediction of Bond s work index from field measurable rock properties article{Chandar2016PredictionOB title={Prediction of Bond s work index from field measurable rock properties} author={Karra Ram Chandar and S N Deo and Ashwin J Baliga} journal={International Journal of Mineral Processing} year={2016}
Relation of Bond ball mill work index and rod mill work index The Bond rod mill and ball mill work indices are the most similar in size classes both being fed material crushed to relatively fine sizes Both test are also locked cycle tumbling tests where the charge of ore in the mill is brought to a steady state over the duration of a test
Table of Bond Work Index by Minerals Free download as PDF File pdf Text File txt or read online for free
• SAGDesign SAG to T80 12 M followed by Bond BM Wi on SAG ground ore • Bond Ball Mill Work Index Crushed Feed • Specific Gravity part of the SAGDesign test The results from this work are presented below and are discussed in this paper The SAGDesign results were compared to JK Drop Weight analysis of results by analyzing the SAGDesign
The result shows that the maximum Bond work index of 14 KWh/mt was obtained for A type iron ore sample The Bond work index for B and C type iron ore sample are of 11 and 10 KWh/mt
The Bond work index W i is an indicative parameter for ores grindability It is used for mill design and estimation of grinding energy It is affected by different parameters some of which are
Maxson et al 1933 It was extended by Bond 1952 to provide a work index result that was empirically calibrated to make a laboratory work index match the corresponding work index measured in an industrial grinding mill The fitted equation in metric form is given as Equation 1 1 𝑊𝑖= × 𝑃100 × À× 10 √
The Bond s equation was then used to calculate the work index of the Muro iron ore which was found to be kWh/ t when marble was used as reference ore and kWh/ t when granite was used
An improved method using less mass compared to the Bond Ball Mill Work Index test The JK Bond Ball Mill JKBBM test is a locked cycle grindability test conducted using a standard laboratory Bond Ball Mill with the same steel ball charge and material feed size 100% passing mm as the Bond Ball Mill Work Index test The test requires
Bond index is useful in designing of grinding system in mineral processing In this study the Bond work index of Birnin Gwari iron ore in northern Nigeria is determined using modified Bond s method using reference ore Samples of iron ore were sourced using random method reference minerals; marble and granite of known weight and iron ore of known weight were ground using
FIGURE 8 ROD MILL/BALL MILL WORK INDEX RATIO v UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS MPa 0 1 2 WiRM/WiBM metric Siddall et al 1996 identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore s compentency Figure 8 plots this ratio versus UCS; no trend is apparent
Bond work index of Birnin Gwari iron ore in northern Nigeria is determined using modified Bond s method using reference ore Samples of iron ore were sourced using random method
The result shows that the maximum Bond work index of 14 KWh/mt was obtained for A type iron ore sample The Bond work index for B and C type iron ore sample are of 11 and 10 KWh/mt The variation of BWI of three iron ore sample may be varied during the geological formation of each iron ore sample The output product of three
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