Hardgrove grindability index (HGI) - SlideShare

The Hardgrove Grindability Index (HGI) test is based on Rittinger's theory that ''the work done in grinding is proportional to the new surface produced'' [17,18] .

An index for quantifying the degree of torrefaction ...

May 01, 2013· Hardgrove grindability index (HGI) 1. PRESENTATION TOPICHARDGROVE GRINDABILITY INDEXAND EFFECT OF COAL BLENDIN ON ITPRESENTATED BYKOMAL AROOSH()DEPARTMENTCENTER FOR COAL TECHNOLOGYPUNJAB UNIVERSITY LAHORE 2. GRINDABILITY OF COALThe measure of the coal resistanceto crushing is said to be the …

Evaluation of the effect of coal chemical properties on ...

Experiments included the determination of grinding capacity, mill power consumption and laboratory analysis of coal characteristics and Hardgrove grindability index (HGI). The analysis of experimental results found that the grinding capacity has a negative correlation with the ash content in coal.

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Sep 01, 2014· Maceral/microlithotype analysis of the hardgrove grindability of lithotypes from the Phalen coal bed, Cape Breton, Nova Scotia. Minerals and Metallurgical Processing, 14: 49-54. Hower, J.C., Wild, G.D. 1988. Relationship between hardgrove grindability index and petrographic composition for high volatile bituminous coals from Kentucky.

Estimation of hardgrove grindability index (HGI) based on ...

Fakultas Teknik – Universitas Mulawarman p-ISSN : e-ISSN : PROSIDING SEMINAR NASIONAL TEKNOLOGI V Samarinda, 10 Oktober 2019 27 STUDI PENGARUH TINGKAT PEMANASAN TERHADAP NILAI HARDGROVE GRINDABILITY INDEX (HGI) PADA RANK BATUBARA Wita Rebekka Manalu 1*, Windhu Nugroho, Shalaho Dina Devy 1Program Studi S1 Teknik …

(PDF) Practical assessment of grinding capacity and power ...

Dec 22, 2020· The strength of the relationship varies in degree based on the value of the correlation coefficient. For example, a value of 0.2 shows there is a positive correlation …

hardgrove index limestone

Appendix A. Correlation to Estimate the Equivalent Hardgrove Grindability Index (HGIeq) To find an equation that helped to predict the grindability behavior (equivalent HGI index) of a torrefied biomass, a correlation of the HGIeq in function of the chemical composition of different biomasses was calculated, namely a proximate analysis.

Thermal Science - scientific journal [paper: Practical ...

The Hardgrove Grindability Index (HGI) test is based on Rittinger's theory that ''the work done in grinding is proportional to the new surface produced'' [17,18] .

(PDF) Investigation into the applicability of Bond Work ...

value, Hardgrove Index, total car-bon, etc.Theindependent variables Xl, X2,Xa,etc. may bepercentage moisture (H2O), percentage volatile matter (VM), or percentage ash (Ash)ontheir own,butalsopowers, functions, or any combination of these. Humphreys and Lawrence had considerable success using thesimp-lestpolynomial form,andthiswillbe adhered to.

Physicochemical characterization of torrefied wood biomass ...

Oct 15, 2015· Studies have shown an approximate correlation of HGI and BWI based on the findings of several studies for a wide range of materials, but biomass was not amongst the materials tested, . Bond proposed the following equation for finding the equivalent wet grinding work index (W i) from the Hardgrove Grindability Index : (1) W i = 435 / (HGI) ∧ 0.91

Hardgrove Grindability Index (HGI) | Mining | SGS

The Bond's work index of the above rock samples calculated from the Hardgrove index value has shown a variation from 7.7 to 10.3 kWh/sh.t. A correlation is found between the friability value and work index. The correlation coefficient of 0.93 between the friability value (S1) and Bond's work index, Wi = -18.193 Ln (S1) + 66.747 has been found.

Mohs Hardness Hardgrove Grindability Correlation Pulverizer

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 samples and its correlation.

Theestimation ofsomeproperties ofSouth African ...

Mohs Hardness Hardgrove Grindability Correlation Pulverizer. Grindability Index Cement hardgrove index for slag BINQ Mining Feb 23 2013 183 Mohs hardness hardgrove grindability correlation mineral Hardgrove Index The grindability of a coal is expressed as an index clean coal coke coal coal slag Coal. Send Email: [email protected]

Alternative Approaches for Determination of Bond Work ...

Statistical factors (correlation coefficient, mean square error, and variance accounted for) and differences between actual and predicted values demonstrated that the GA-ANFIS can be applied successfully, and provide high accuracy for prediction of those coal variables. Keywords: ANFIS, Genetic algorithm, Grindability index, Calorific value, Free

An assessment of chemical properties and hardgrove ...

Studying the correlation of rock properties with P Know More nbsp 0183 32 The correlations of V p with number of joints point load index UCS impact strength index S i and Schmidt rebound number were investigated by Kahraman 2001a Kahraman 2001b Ozkahraman et al 2004 were determined the thermal conductivity of rocks using the V p index...

(PDF) Estimation of some coal parameters depending on ...

Hardgrove grindability index (HGI) can be estimated from the test. A higher index indicates the coal is easier to pulverize. This is opposite to the pattern found with the Bond work in-dex where soft mineral ores generally have low work indices. Aplan, Austin, Bonner, and Bhatia (1974) and Aplan (1996) have shown a correlation between HGI and W i

Theestimation ofsomeproperties ofSouth African ...

Hardgrove index and brittleness test can be carried out easily on only those ores or rocks or materials, which are soft, friable and brittle [1-3]. Indices with which the crushing resistance or the grindability in a wide meaning is expressed include the Rittinger number, crushing resistance, Hardgrove index and Bond work index.

CORRELATION BETWEEN BOND WORK INDEX AND …

to find out the grindability index termed as Statistical Grindability Index (SGI) from that equation correlation coefficient of this relationship achived 0.93 ³. Ural. et al, E. Jorjani et al and H.B. Vuthaluru studied the effects of mineral matter content and elemental analysis of coal on HGI Turkish, Kentucky and Australia coals ...

Alternative Approaches for Determination of Bond Work ...

value, Hardgrove Index, total car-bon, etc.Theindependent variables Xl, X2,Xa,etc. may bepercentage moisture (H2O), percentage volatile matter (VM), or percentage ash (Ash)ontheir own,butalsopowers, functions, or any combination of these. Humphreys and Lawrence had considerable success using thesimp-lestpolynomial form,andthiswillbe adhered to.

Estimation of some coal parameters depending on ...

The Hardgrove Grindability Index (HGI) test is based on Rittinger's theory that ''the work done in grinding is proportional to the new surface produced'' [17,18] .

Hardgrove grindability index and approximate work index of ...

Studying the correlation of rock properties with P Know More nbsp 0183 32 The correlations of V p with number of joints point load index UCS impact strength index S i and Schmidt rebound number were investigated by Kahraman 2001a Kahraman 2001b Ozkahraman et al 2004 were determined the thermal conductivity of rocks using the V p index...

hardgrove index limestone

Grindability Index Cement hardgrove index for slag BINQ Mining Feb 23 2013 183 Mohs hardness hardgrove grindability correlation mineral Hardgrove Index The grindability of a coal is expressed as an index clean coal coke coal coal slag Coal. Send Email: [email protected] Get Price List Chat Online.