Grinding kinetics of steady-state feeds in locked-cycle dry ball milling

Acar, Cemil; Hoşten, Çetin

doi:10.1016/j.powtec.2013.08.032

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…As seen in Figure 6, the size-normalized breakage distribution curves of the size fractions of either the HPGR feed or the HPGR product do not fall onto a single curve, indicating non-normalizable B i1 values. This non-normalizable breakage phenomenon is typical of narrow-size fractions of larger particles of hard minerals, such as quartz and cement clinker, exhibiting nonlinear breakage rates (Austin et al 1984;Acar and Hosten 2013). Furthermore, the B i1 values increase with increasing starting particle size, producing more fines upon breakage.…”

Section: Kinetic Breakage Parameters Of Hpgr-treated Clinkermentioning

confidence: 96%

Ball-Mill Grinding Kinetics of Cement Clinker Comminuted in the High-Pressure Roll Mill

Camalan

Hoşten

2015

Mineral Processing and Extractive Metallurgy Review

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The use of high-pressure grinding rolls (HPGR) prior to ball mills has become a common practice in cement clinker grinding due to significant energy savings in comparison to ball milling alone. The energy savings has been attributed to higher energy efficiency of HPGR at low reduction ratios, smaller particle top sizes in the ball mill feed, and the weakening of particles resulting from compression of particle bed by HPGR. This study attempts to show how the weakening effect changes the kinetic breakage parameters of the HPGR-treated clinker. For this purpose, batch ball mill experiments were conducted with three narrow-size fractions (À3.35 þ 2.36, À1.70 þ 1.18, and À0.85 þ 0.60 mm) of the feed and product samples of an industrial HPGR, and the breakage rate and breakage distribution parameters of the samples were compared. The results show that the weakening effect leads to nonlinear breakage rates for all sizes, coupled with abnormal breakage at the two coarsest sizes. The weakening effect leads to increased breakage rates of the HPGR product relative to particles of the HPGR feed. The increased breakage rates are accompanied by coarser progeny distributions for the two coarsest size ranges relative to that of the HPGR feed. The progeny distribution of the finest size of the HPGR product, however, is finer than that of the HPGR feed. Ball milling of size-distributed feeds prepared from the HPGR product and feed samples for the same grinding time produces self-similar size distributions when the size is normalized with respect to the median size.

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Section: Kinetic Breakage Parameters Of Hpgr-treated Clinkermentioning

confidence: 96%

Ball-Mill Grinding Kinetics of Cement Clinker Comminuted in the High-Pressure Roll Mill

Camalan

Hoşten

2015

Mineral Processing and Extractive Metallurgy Review

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“…The grinding kinetics are traceable through the charge movement within the grinding cylinder, where the charge is dragged from the mill toe position to the critical height position at the mill shoulder, and the periodic circular path and parabolic path are adapted through means of particulate movements to study and develop the critical mill speed relation [9], [14], [16], [17], [18]. Circulating coal charge material are interchangeably subjected to the vertical drag force provided by the kinetic potential energy powered through centrifugal force in lifting the material toward the critical height position and the downward gravitational potential energy which thrust that material to the mill toe where majority of fragmentation is achieved.…”

Section: Mechanical Grinding Modelmentioning

confidence: 99%

Coal Sampe Preparation Strategy using the TENCAN GQM series Ball Milling device.

Gaesenngwe,

RAGHUPATRUNI,

MAMVURA

et al. 2024

Preprint

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The application of Semi Autogenous Grinding strategy in mineral beneficiation engineering is well defined and established unit operation that is qualified for liberation of valuable final products from various rock ores of various kinds. The TENCAN GQM series Ball Mill equipment was deployed throughout our investigation to learn on optimum setting factors that are crucial in achieving effective product quality outcome during coal beneficiation. Therefore, a Semi-autogenous grinding methodology was deployed for grinding five (5) different coal samples into a product stream ranging in particle size from below [−600μm, +38μm] through an optimized procedure that syndicate three(3) control parameters being the {A − powder filling (fc), B − ball loading (JB) and C − residence time or grinding duration (t)}. Moreover, to analyse the grinding kinetics during interaction to produce coal mass recovery at desirable particle size specification relevant for specific manufacturing industry. However, initially the coal sample material was acquired and characterized via three spectroscopy techniques {x – ray diffraction (XRD), x – ray fluorescence (XRF), scanning electron microscopy (SEM)}, to establish contrast of each sample material in composition, morphology, hardness, and the relative abundance of occurring species entrenched within the coal structure (inorganic matter). Hence using the Proximate testing, Ultimate testing, and petrography analysis the examination was possible for each sample type collected. The coal samples that were initially collected were assorted in particle sizes classification and were grouped as run-of-mine coals (−200mm), Cobbles (−75mm, +40mm), Nuts (−40mm, +25mm), Peas (−32mm, +14mm) and fines (−14mm) according to our laboratory sieve specifications. However, the acquired coal species were initially subjugated to a hardness testing using the Hardgrove grindability Index device that reported a variable coal grindability index value with material hardness increased from Nuts (60.37), Cobbles (64.58), ROM (66.84), Fines (66.99) to Peas (67.37) which are relatively soft compared to other coal samples. Process engineers, researchers and students in different organizations studying metallurgy and coal beneficiation etc., must be informed about factors affecting coal material preparation innovations and the health-safety risk encounter by the mineral engineer personal during handling and processing. Moreover, production efficacy is significantly improved through adopting optimized model functions that accurately increase the product recovery at lower power rating for the cumulative production path hence relevantly reducing the cost(s) of exacerbated by tedious and unnecessary methods.

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“…On the other hand, laboratory-scale experimentation that simulate continuous closed-circuit grinding can provide detailed information which might be extended to predicting the response of fullscale comminution systems under dynamic conditions [4][5][6][7]. Locked cycle grinding tests are widely used for assessing the grindability of industrial minerals and ores, for the design and scale up of industrial mills, and for studying the likely behavior of industrial grinding circuits under different operating conditions [8][9][10][11]. These tests experimentally simulate on the laboratory scale a tumbling mill operating under plug flow conditions in a closed loop with a classifier which may or may not be perfect.…”

Section: Introductionmentioning

confidence: 99%

Study of the Behavior of Binary Mixture Grinding Using the Fixed-Time Locked - Cycle Tests”.

rizk

2020

JES. Journal of Engineering Sciences

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Grinding kinetics of steady-state feeds in locked-cycle dry ball milling

Cited by 10 publications

References 12 publications

Ball-Mill Grinding Kinetics of Cement Clinker Comminuted in the High-Pressure Roll Mill

Ball-Mill Grinding Kinetics of Cement Clinker Comminuted in the High-Pressure Roll Mill

Coal Sampe Preparation Strategy using the TENCAN GQM series Ball Milling device.

Study of the Behavior of Binary Mixture Grinding Using the Fixed-Time Locked - Cycle Tests”.

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