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ABSTRACT The Hardgrove Grindability Index (HGI) is a measure of coal's resistance to crushing. HGI is influenced by many factors due to the complex structure of coal. This study examines the effect of the proximate and ultimate analysis and maceral content on HGI, based on 329 samples of Polish coals. In this study, a machine learning …
Specific surface, average grain diameter Table 1: Characteristics of the grindability of ETP slag No. Grinding Residue on Specific Bulk density, Average grain Intergranular time, min sieve No. surface, g/cm3 diameter, μm hollowness 008, % cm2/g 1 45 20,4 1967 1,27 10,9 0,48 2 60 7,3 2611 1,19 8,2 0,52 3 75 4,4 3344 1,13 6,4 0,54 The specific ...
Wide use of grinding process has become an important feature of manufacturing process in modern industries. To fully understand the grinding …
Grinding trials have been carried out with electroplated diamond wheel and resin bonded diamond wheel. Relative parametric influence on tangential (F x) and normal components (F z) of grinding force for both resin bonded and electroplated diamond wheels are illustrated in Fig. 3a, Fig. 3b, Fig. 4a, Fig. 4b, respectively.It can be seen that mostly …
As mentioned previously, the lack of an accurate description of the rock, the rock factor, is problematic. Cunningham related this to a blastability index proposed by Lilly ().This index is related to the rock mass description, joint spacing and orientation, rock density influence and a hardness factor using an empirical formula and coding …
Pereira et al. studied the effects of grinding wheel conditioning on the grinding efficiency of titanium alloys. An aggressive dressing strategy reduced surface roughness by 53.74%, along with a ...
Grindability as a material characteristic must indicate the suitability for size reduction. Its value has to give the result of the grinding operation as a result of unit energy expenditure. And here we meet a difficulty: the result of the operation is a new particle...
Nickel-based superalloy is a typical hard-to-machining material in the aero-engine manufacturing industry. The grindability difference of two kinds of nickel-based superalloys, i.e., equiaxed cast nickel-based superalloy K4125 and wrought nickel-based superalloy Inconel718, are discussed in this article. The influence of grinding …
In the mining industry, rock blasting can be considered as the first phase of comminution. The downstream phases of comminution are mechanical, and consist in consecutive stages of crushing and milling for grain size reduction. The total energy of mechanical comminution depends on grain size and on the resistance of the material to grindability. Usually, the …
Journal Article: The influence of mineralogical, chemical and physical properties on grindability of commercial clinkers with high MgO level ... This research investigates various methods able to identify possible mineralogical, physical and chemical influences on the grindability of commercial clinkers with high MgO level. The aim of …
Performed an experimental work by grinding of Al/SiC composites. The effect of cylindrical grinding parameters including speed of the wheel, the speed of workpiece, …
1. Introduction. While the Hardgrove grindability index (HGI) is a long-established test for the evaluation of coals for combustion and, compared to many of the chemical tests of coal, the equipment is cheap and relatively easy to maintain, the test is inherently inaccurate owing to the simple fact that the test fraction is generally not …
The influence of microwave pretreatment on grindability of lead-zinc ore was studied through comparison analysis on the changes of particle size distribution, percentage of below 0.074 mm, ... Figure 11 showed the influence of different ball milling time on the grinding fineness of lead-zinc ore after microwave pretreatment.
The Influence of Stirred Mill Orientation on Calcite Grinding Serkan Cayirli1 & Hasan Serkan Gokcen2 Received: 28 September 2020/Accepted: 7 April 2021 # Society for Mining, Metallurgy & Exploration Inc. 2021 Abstract The purpose of this study was to investigate the dry grindability of calcite powders in a vertically and horizontally orientable
Grindability is normally measured by determining the number of revolutions in a pulverizer that are required to achieve a given size reduction. This is an indirect measure of the …
Grindability as a material characteristic must indicate the suitability for size reduction. Its value has to give the result of the grinding operation as a result of unit energy expenditure.
The influence of microwave pre-treatment on grindability of iron ore (Orissa, India) was investigated by grindability tests. SEM analysis characterized the micro-fractures in microwave treated sample. ... The mass retained in the original size class after a specific time in the mill was determined and then the under size and over size …
The influence of thermal treatments on the grindability of low-grade hematitic iron ores from Michigan and Minnesota was examined in bench-scale tests. Treatment factors were roasting temperature, roasting atmosphere, and ore cooling conditions. Bond ball mill grindability and work indices were used as response indicators in evaluating the ...
In the grinding process too, the research work includes ecological elements such as reducing the consumption of cutting fluids through minimum quantity lubrication, utilizing cryogenics, hybrid …
The time of grinding was . constant and equa l to 13 minu tes. ... physical and chemical influences on the grindability of commercial clinkers with high MgO level. The aim of the study is to ...
The influence of Triethanol amine and ethylene glycol on the grindability, setting and hydration characteristics of Portland cement 82 Corig 2019 asem e al Citation: Hashem FS, Hekal EE, Wahab MAEI. The influence of Triethanol amine and ethylene glycol on the grindability, setting and hydration characteristics of Portland cement.
Torrefaction is a promising pre-treatment for improving the fuel quality of biomass. This study examined the effect of a mild torrefaction (from 160 to 230 °C) on the heating value, elemental composition, and thermogravimetric analysis of wood from eight Eucalyptus species (E. botryoides Sm., E. globulus Labill., E. grandis W.Hill ex Maiden, E. maculata …
The grindability of raw biomass and the treated samples was compared and an improvement in the grindability characteristics was observed after the torrefaction process.
In this paper, a theoretical model for the grinding force of SiCp/Al composites was established. The model introduces a novel approach by integrating the SiC particle …
Generally speaking, grindability is not an absolute but a fineness dependent characteristic. With growing fineness, grindability decreases. Data in manuals are related to moderate …
This study investigates the influence of wood pellet properties on the grindability of pellets in a lab-scale disc mill. The pellet properties investigated included wood type, moisture content, internal pellet particle size distribution, particle density, and durability. Two pellet qualities for industrial use (designated I1 and I2 as per ISO 17225 …
Enormous quantities of coal must be ground as feed to power generation facilities. The energy cost of grinding is significant at 5 to 15 kWh/ton. If grindability could be increased by preheating the coal with waste heat, energy costs could be reduced. The objective of this work was to determine how grindability was affected by preheating. …
The time required for complete grinding of the samples was recorded. During grinding, the instantaneous power consumption data with respect to time was recorded and used for energy consumption calculation. ... Influence of torrefaction on the grindability and reactivity of woody biomass. Fuel Processing Technology 89 (2), 169–175. M ...
The maintenance at high temperature for a long time and the cooling process are also reported as affecting factors to grindability since it is related to the size and shape of the crystals [53]. ...
It was observed that clinker A presents a higher lime saturation factor (LSF) than B and C, but a lower silica ratio (SR). The alumina ratio (AR) can influence the grindability [6]; normally clinkers with a high AR have high grindability. AR values for the studied clinkers are 1.52 (clinker A), 1.57 (clinker B) and 1.46 (clinker C).