This result suggests that, when performing correlation studies among ore grindability and rock mechanics parameters, it is advised to use the grindability index …
The relationship between wi and grinding size did not show a clear correlation, while the grindability index (gpr) and the grinding size showed a robust correlation, fitting in all cases to a quadratic curve with a very high regression coefficient.
A very good correlation coefficient was found between the experimental HGI values and the HGI values determined with the new model presented.
eproduced by Sab inetG a tew ayunder licence gran ted by thePub lisher (da ted 2012 .) 638. Journal of the South African Institute of Mining and Metallurgy. July, 1965. The grindability and abrasive properties of South African coals— A. A. Meintjes. o. Z. O'. Q.
This indicates the existence of threshold moisture value above which the grindability of the samples declines. Overall, the results indicated a good correlation between residual moisture and HGI with correlation coefficients of 0.5 to 0.9 depending on the type of coal seam or blend.
Finally, the relationships between the Bond grindability (Gbg) with chemical analysis values (calcium oxide, silicon dioxide and loss on ignition) and modulus of a mixture of raw materials were ...
The Bond work index (W i ) is an indicative parameter for ores grindability. It is used for mill design and estimation of grinding energy.
Analysis indicates high values of the correlation coefficient (0.918–0.983) and coefficient of determination (84.2–96.6%) for the equations derived. Hence, the …
Torrefaction of biomass improves the grindability of raw biomass by the transformation from a fibrous structure to a more brittle and friable, coal-li…
It is possible that advanced explorations of the correlation between the physical and mechanic features of materials and their Bond work index could give the correct answer to the question on how to determine the Wi of samples of materials of non-standard size (Deniz and Ozdag, 2003; Ozkahraman, 2005, 2010).
Approximate correlation between HGI and BWI found for some biomass samples. a b s t r a c t With increasing quantities of biomass being combusted in coal fired power stations, there is an urgent need to be able to predict the grindability of biomass in existing coal mills, but currently no standard bio-mass grindability test exists.
This result suggests that, when performing correlation studies among ore grindability and rock mechanics parameters, it is advised to use the grindability index …
The purpose of this study was to show the correlation between grindability and dynamic parameters obtained using dynamic methods, rather than …
Friability of rocks and ores can be determined by brittleness tests. A test apparatus to determine friability value has been designed to suit limestone strength characteristics used in cement production. The friability values of barite, marble, limestone and bauxite have been determined and compared with the corresponding Bond work …
The Hardgrove grindability index was determined using the available methods described in the standards, and the dependence on selected parameters was examined.
Three Bond work index tests are commonly used in the industry. This essay discusses some observations from SAGMILLING database of published grindability results about relationships, and lack …
The relationship between wi and grinding size did not show a clear correlation, while the grindability index (gpr) and the grinding size showed a robust correlation, fitting in all cases to a quadratic curve with a very high regression coefficient.
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.
This work evaluates, analyzes, and predicts the grindability and abrasive behavior of coal blends. Three binary coal blends with common low-grade coal were first prepared at various ratios.
The purpose of this study is to determine the correlation between the elastic parameters of materials, obtained with dynamic methods, and grindability, and to find …
In order to determine the correlation between the mineral composition and grindability characteristics of the ores, a polished sections of ore samples from the three hydrothermal Pb-Zn deposits ...
Download Citation | Schmidt Hammer Rebound (SHR) values as a guide for the initial estimates of limestone uniaxial compressive strength (UCS) and Hardgrove grindability index (HGI) | In this study ...
(1) The correlations of the Hardgrove grindability index with the composition, structure, and properties of coal from Ukraine, Russia, Canada, Australia, the Czech Republic, …
Semantic Scholar extracted view of "A meaningful expression between bond work index, grindability index and friability value" by H. T. Ozkahraman
The Hardgrove grindability index was determined using the available methods described in the standards, and the dependence on selected parameters was examined. A clear positive correlation with calorific value and smaller (also positive) correlations with moisture content and free swelling index was obtained.
Absolute grindability is the grindability value of the ore measured under the specified test method and test conditions. The two differ in test methods and the …
The grindability study also included the establishment of the correlation between the grindability and conventional grinding practices. The above goals were achieved.
Approximate correlation between HGI and BWI found for some biomass samples. a b s t r a c t With increasing quantities of biomass being combusted in coal fired power stations, there is an urgent need to be able to predict the grindability of biomass in existing coal mills, but currently no standard bio-mass grindability test exists.
Referring to graphical demonstrations of the correlations obtained (Figs. 7 – 12 ), significant correlation coefficients are obtained between SHR values and mechanical and grindability test results.
