-Average surface bulk temperatures and measured Bond work index
Bond work index grindability values decreased for the vein type copper ore (ore 2) in which fusing of particles was not observed. The largest decrease, i.e. improvement, in the work index (by 13% ...
EFFECT OF OPERATING VARIABLES ON BOND'S WORK INDICES …
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial ...
[PDF] Alternative Approaches for Determination of Bond Work Index …
PLK (Partially Laterised Khondalite) rock is a general terminology used in this paper for those rocks which are in general associated in bauxite mining such as Partially Altered Khondalite (PAK) rocks, Partially Kaolinised Khondalite (PKK) rocks and Lithomerge. This paper deals with the Bond's work index, Hardgrove index and Brittleness tests on six typical rock …
Characterization and Comminution Studies of Low-Grade Indian Iron Ores
A higher Bond work index value was found for the BHJ ore (15.4 kWh/ton) than for the BHQ ore (12.4 kWh/ton). A decrease in the product particle size was associated with an increase in the work index value. ... Characterization studies play an important role in the processing of ores. These studies help to identify the major and minor minerals ...
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 Professional …
SAG Mill Testing
Bond Rod Mill 0.305 12.7 Any 1.18 15 10 Locked-cycle Y Y Bond Ball Mill 0.305 3.35 Any 0.149 10 5 Locked-cycle Y Y Mod Bond 0.305 3.35 Any N/A 2 1.2 Batch N Y 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.
Effect of mineralogy on grindability -A case study of copper ores
Sulphide 1 contained more than 80% (w/w) of quartz compared to about 70% in the other two ores. The Bond work indices were 13.8, 21.6, and 17.3 kWh/t for sulphide 1, sulphide 2, and oxide ore ...
Bond´s work index estimation using non-standard ball mills
The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
Heating Pre-Treatment of Copper Ores and Its Effects on the Bond Work Index
This is supported by the work of Cisternas et al. [6], who heated copper ores prior to grinding and measured the response using the Bond Work Index. Heating the ores before grinding is believed to ...
Studying the effect of ore texture on the Bond Work …
The maximum difference in the Bond work index for the five tested gold ores was 11% (e.g. Whereas, an average interval between the two-sequence types of the tested ore was approximately 2.5%. (e.g. ).
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
The commonly used grindability tests included in the database are the Bond work indices for ball milling, rod milling and crushing; the drop weight test results A, b, A×b, DWi, Mia, Mic, Mih and ...
A new methodology to obtain a corrected Bond ball mill work index …
The presented model is valid only for ores with a typical Hukki exponent. ..., however, none of them is considered fully satisfactory (Wills and Atkinson, 1993), nevertheless, they are viewed as important for certain ... Variations in the Bond work index as a function of initial sample size are often less than the random variations expected ...
Comparison of UCS to Bond Work Indices
Traditional measurements of ore grindability are the Bond Work Index (Wi) values (Bond, 1952), divided into a low energy crushing work index (WiC) for coarse rocks (75-50 mm), a rod mill …
Bond Work Index Formula-Equation
For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was …
Bond Work Index Report Matrix House
The grindability test determines the hardness of the ore and the Work Index obtained is important in the design of a grinding circuit. The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability
Comparison of Ore Hardness Measurements for …
standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu. (See reference 8 below). The comparison of these results gives context to how the various measurements relate to each
Compare and Understand Rod/Ball/Impact …
BOND RWi, BWi, CWi, Ai Work Index: What's the difference. Three Bond work index tests are commonly used in the industry. This essay discusses some observations from SAGMILLING database of published …
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
Examples of the variation in work index at Centerra's Mount (Mt.) Milligan mine and the implications for mill operation and design will be discussed. A revised definition of work index is offered that makes clear the distinction between specific energy consumption and work index. Keywords Bond, work index, specific energy, power model
Table of Bond Work Index by Minerals
97 rowsThis Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table.
Using Rock Geomechanical Characteristics to Estimate Bond Work Index
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 efficiency of the …
Indicators of grindability and grinding efficiency
indices provide the same information as the Bond indices; whether one type of index is more accurate or more useful than the other; whether there are limitations to the ~s indices similar to those to the Bond Wi indices. Information on these questions is presented here from work done on Witwatersrand gold ores. However, the principles relating
Ball Mill Design/Power Calculation
The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of …
Determination of work index in a common laboratory …
The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment. However, it must be obtained under restrained conditions, especially in regards to ...
Characterization and Bond Work Index Determination of …
The bond work index test obtained high work index 52.60 kw.h/t and consumed power 11.72 kw.h/t to grind one ton of low grade iron ore and this attributed to the high concentration and hardness of ...
Variability Study of Bond Work Index and Grindability …
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 (i.e., whatever the type of the mill and its
Comparison of the measured Bond work index and the Bond work index …
The brittleness indices of the ores were calculated using the chemical composition of the gangue, and a good correlation between brittleness indices and Bond work indices was observed, which ...
Comparison of UCS to Bond Work Indices
grindability well in advance of when ore are actually mined. Traditional measurements of ore grindability are the Bond Work Index (Wi) values (Bond, 1952), divided into a low energy crushing work index (Wi C) for coarse rocks (75-50 mm), a rod mill work index (Wi RM) for intermediate sized particles (25-3 mm), and a ball mill work index (Wi
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT …
Understanding your ore's variation of work index by size is particularly useful for SAG mill troubleshooting and production forecasting. Examples of the variation in work index at...
Hardgrove grindability index and approximate work …
Knowing the average Hardgrove index, a calculated work index of 12.88 kW/STPH was estimated using Aplan's empirical formula. This average work index was less comparable to those of feldspar ores given in the literature. Therefore, the method of Berry and Bruce was used to determine the specific energy and approximate work index.
Correlation of crushing work index and drop-weight index.
Ore hardness can be estimated using commercially available standard techniques such as the SAG Power Index (SPI), Bond Work Index (BWI), and JK Drop Weight (JKDW) tests (Bailey et al., 2009 ...