This study addresses the influence of material variations on the grindability of crankshaft steel. Most previous studies on the effect of material microstructure on grindability involve comparisons of significantly different steel grades.
The objective of this work was to determine how grindability was affected by preheating. The method was to use population balance grinding models to interpret results of grinding coal before and after a heat treatment. Simulation of locked cycle tests gave a 40% increase in grindability. Approximately 40% grinding energy saving can be expected.
The process consisted in a heating treatment at moderate temperature (240, 260, 280 C) under an inert atmosphere. The grindability of raw biomass and the treated samples was compared and an improvement in the grindability characteristics was observed after the torrefaction process.
This study addresses the influence of material variations on the grindability of crankshaft steel. Most previous studies on the effect of material microstructure on grindability involve comparisons of significantly different steel grades. This study, in contrast, is focused on batch-to-batch grindability variations for one steel grade, a …
The present study initially investigates the kinetics of microwave-assisted grinding and flotation in a porphyry copper deposit. Kinetic tests were conducted on untreated and microwave-irradiated samples by varying the exposure time from 15 to 150 s. Optical microscopy, energy-dispersive X-ray spectroscopy, and scanning electron …
It is well known that experimental data adjustment quality depends on the model characteristics. Mosher and Tague (2001) concluded that the repeatability and reproducibility of Bond's grindability test could be improved significantly by ensuring closure criteria tests and accurate determining of the feed and product size distributions.
Wang et al. [ 97] investigated the influence of torrefaction on the grindability of bark, stump, and stem wood. Based on their results, the grindability of the biomass materials was significantly enhanced after torrefaction treatment.
Grindability index of coal is an important technological parameter to understand the behaviour and assess the relative hardness of coals of varying ranks and grades during comminution. This is usually determined by Hardgrove Grindability Index (HGI), which involves requirement of a costly grinding equipment and accessories not …
Although it is known that electroplated bond is hard (prevents pull out of abrasive) compared to resin bonded wheel, during grinding, the resin bonded diamond wheel will enable self-sharpening of the diamond abrasive, enabling better grindability.
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 response, in this study, we have systematically investigated how certain grinding parameters (i.e., mill speed, ball filling ratio, ball size distribution, powder filling ratio, grinding aid ratio, and grinding time) of conventional dry ball mills affect the grindability of gypsum ore.
SINCE the last publication of tabulated results of grindability tests by the authors1 the total number of ball-mill tests made has more than doubled, and rod-mill tests have becomeincreasingly important. Nearly all of the standard closed-circuit ball-mill and rod-mill tests made to date are included in the present tabulation, together with additional …
Grindability is considered as an important factor that affects the grinding efficiency of a mineral. Thus, improving the grindability of VBS is an effort to reduce the energy consumption of grinding. At the same time, it may also have a potentially positive effect on the leaching efficiency of vanadium.
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]. ...
The process consisted in a heating treatment at moderate temperature (240, 260, 280 °C) under an inert atmosphere. The grindability of raw biomass and the treated samples was compared and an improvement in the grindability characteristics was observed after the torrefaction process.
Similarly, the inclusion of filtration and drying processes increases the fuel flexibility of biomass. The residence time of hydrothermal torrefaction is generally minutes, and an energy-dense product is obtained in such a short time [40]. The short residence time is the consequence of a faster heat transfer rate in aqueous media [41].
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, the influence of the chemical composition and mineral composition of steel slag on the grindability is reviewed, and the methods of improving the grindability of steel slag, such as the modification of steel slag, the addition of grinding aids and composite grinding, are introduced.
Request PDF | Influence of grinding wheel conditioning on the grindability of Ti-6Al-4V alloy | In the aeronautical industry, many components are subjected to abrasive machining processes to ...
This paper investigates the fuel characteristics and grindability of pine chips and logging residues torrefied at temperatures ranging from 225 °C to 300 °C and 30 min residence time.
Semantic Scholar extracted view of "Influence of Heat Treatment on Grindability of Carbon Steel : Fundamental Experiment by Single Point Tool" by et al.
The grindability of this steel was investigated and compared to that of conventionallyproduced material. Despite differences in microstructure and mechanical properties, the characteristics of the grinding process were comparable in terms of most of the tested grindability assessment criteria, such as specific grinding energy and surface …
The grindability of these fuels was then determined using a laboratory ball mill and by adapting the Hardgrove Grindability Index (HGI) test for hard coals. After grinding, two sets of results were obtained. Firstly a determination similar to the HGI test was made, measuring the proportion of sample passing through a 75 μm sieve and …
These newly developed microstructures pose significant challenges in terms of grindability and component distortion. This fundamental study sheds light on the grindability of microstructure ...
This paper presents briefly the standard grindability testing methods such as Bond- and Hardgrove process. Then the study shows two relatively fast alternative way for the determination of specific grinding work and Bond work index of brittle materials.
The influence of Triethanol amine and ethylene glycol on the grindability, setting and hydration characteristics of Portland cement
Given the previous influences of a significant number of parameters, and the lack of detailed knowledge on the effect of each parameter on grindability, development of a predictive model needs large quantities of input data and a large number of observations.
This paper investigates the fuel characteristics and grindability of pine chips and logging residues torrefied at temperatures ranging from 225 °C to 300 °C and 30 min residence time.
influence clink er grindability. These parameters include the size, content, morphology and colour of
The objective of this work is to give an overview of the influence of torrefaction temperature and residence time on important fuel parameters like chemical composition, heating value and grindability. Additionally, the energy demand of the torrefaction reactor is measured to determine the heat of reaction, which is an important …
This research was undertaken to determine the dependence of the Hardgrove grindability index on selected physicochemical properties of coal. The Hardgrove grindability index was determined using the available methods described in the standards, and the dependence on selected parameters was examined.
