Shahsavari, Procedure for determination of Bond ball work The grindability experiments was carried out on the four typical index in the commercial operations, Min. Eng. 22 (2009) 104–106. samples of copper, lead–zinc, manganese and iron ore in specified [13] L. Tavares, R. Carvalho, J. Guerrero, Simulating the Bond rod-mill grindability ...
Bond Work Index Procedure and Method. grinding cycles. The Bond Work Index is calculated using the formula: 𝑖=1,1 44,5 𝑃𝑐 0,23𝐺,82(10 √𝑃80 −10 √𝐹80) (1) where W i – Bond work index (kWh/t) P c – test sieve mesh size (µm) G – weight of the test sieve fresh undersize per mill revolution (g/rev) F 80 – sieve mesh size passing 80% of the feed before ...
Bond Work Index an overview ScienceDirect . The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 336 mm (6 mesh) to product size in the range of 45150 µm (325100 mesh), thus determining the ball mill work index (Wi B or BWi) The work index calculations across a narrow size range are conducted using the appropriate laboratory work index ...
Bond Impact Crushing Work Index Procedure and Table of. Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond Third Theory of Comminution, the work/energy input is proportional to t. View Details Send Enquiry
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 the ...
Work Index (kWh/t) 20.12 6.32 18.85 9.68 14.95 11.59 16.73 14.03 23.04 12.42 62.50 11.90 8.42 9.15 Table of Materials Reported by Fred Bond1 3 Material Number Tested Ferro-silicon Flint Fluorspar Gabbro Glass Glass Gneiss Gold ore Granite Graphite Gravel Gypsum rock Iron ore – hematite Hematite-specularite 13 5 5 4 4 4 3 197 36 6 15 4 56 3 1
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 80% passing size P of the broken rock must be measured by size analysis or must be estimated to obtain the blasting work index. Two blasting tests (Bond, 1954) on Taconite iron ore in Minnesota five years ago gave work index values of 14.5 and 13.5, or an average of 14.0, which compares with 14.7 recently obtained in crushing this ore in ...
commonly used parameter to measure ore grindability is the bond work index, [11]. The bond ball mill index test is a standard test for determining the ball mill work index of a sample ore, [8] [10]. The work index expresses the resistance of the material to crushing and grinding. Numerically, work index is …
This 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. Source 1
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 ...
Bond Work Index an overview ScienceDirect Topics. 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 kWht 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 ...
The results obtained show that weight retained varies from confirmed that particle size analysis using sieves is 36.71 g to 183.1 g for granite while that of iron‐ore vary from one of the oldest and most widely employed methods 9.65 g to 87.78 g. In addition, it was observed that granite today. As a result of comminuting iron ore and granite ...
World consumption of iron ore grows 10% per annum on average with the main consumers being China, Japan, Korea, the United States and the European Union. This entry was posted in Uncategorized. Bookmark the permalink .
Grinding iron ore licture ore has a magnetite content of around 90 he bond work index w i of the ore is 9kw hthe second ore is from mertainen, a potential new mine, about 30 km away from kirunaickr discussing iron ore grinding machine in large dec 28, 2005 grinding is a powdering or pulverizing process using the rock mechanical forces of ...
Grinding is a process of reduction of lumps to powder depending on the requirement of particle size and particle shape. The present investigation involves the identify the physical properties of three different types of iron ores by using Bond ball mill. The result shows that the maximum Bond work index of 14 KWh/mt was obtained for `A' type iron ore sample.
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 [Bond 1961].
1.. IntroductionA Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. It was developed by Fred Bond in 1952 and modified in 1961 (JKMRC CO., 2006).This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding, and for ball mill ...
For ball mill, Bond (1958) was proposing an empirical formula giving the top size of balls (make-up balls) DM function of the feed size xG (80% passing size - µm), the ore true specific gravity sg, the ore Bond Work Index Wi (kWh/st), the fraction of critical speed fc and the inside mill diameter D (m):
Key words: Grinding; Bond work index; Population balance model. 1 Technical contribution to the 6th International Congress on the Science and Technology of Ironmaking – ICSTI, 42nd International Meeting on Ironmaking and 13th International Symposium on Iron Ore, October 14th to 18th, 2012, Rio de Janeiro, RJ, Brazil.
Determination of the energy consumption for ore grinding in a Bond ball mill requires samples of standard size, because changes in the size of the samples cause the change of the Bond work index ...
The work index of 20.39 Kwh/s ton value obtained when granite was a reference ore is within the limit of work index of some iron ores in Nigeria (Weiss, 1965 and Thomas, 2007). 4. CONCLUSION AND RECOMMENDATIONS The study shows that work index of Birnin –Gwari iron ore can be taken as 28.66 Kwh/ston i.e.
Grindability. by Ames. Ore grindabihty refers to the ease with which materials can be comminuted and data from grindability tests are used to evaluate crushing and grinding efficiency.Probably the most widely used parameter to measure ore grindability is the Bond work index W; The work index, Wi, is calculated kWh per ton applied in reducing ...
A bench test was developed for dry grinding to determine the Bond work index and to know the PSD and hematite liberation in all the three iron ore product samples obtained from the BBM. For each iron ore sample, 700 cc of feed was weighed and added into the BBM. The BBM was set for 100 revolutions in the first iteration.
Bond Grinding Work Index Of Indian Iron Ore High efficiency aluminium ore crusher with ce milling equipment we offer advanced rational solutions for any size reduction requirements including quarry aggregate grinding production and complete stone crushing plant home gt products azeus aluminium.
The bonding index for iron ore, low grade and high grade limestone and pozzolan were calculated to be 14.75, 11.61, 11.87 and 10.80 Kwh/t, respectively. ... Bond work index (BWI) values of clinker ...
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,
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 ...
The mineralisation is particularly soft for crushing and grinding, with a Bond work index of 6.3 and an overall comminution power requirement of 6.7 kWh/t of ore. This equates to 39 kWh/t of concentrate which is significantly less than for similar projects. The mineralisation fractures easily, preferentially along grain boundaries.
12%A bench test was developed for dry grinding to determine the Bond work index and to know the PSD and hematite liberation in all the three iron ore product samples obtained from the BBM. For each iron ore sample, 700 cc of feed was weighed and added into the BBM. The BBM was set for 100 revolutions in the first iteration.
