Flow of materials in rod mills as compared to ball mills in dry systems

Abouzeid, Abdel-Zaher M.; Fuerstenau, D.W.

doi:10.1016/j.minpro.2011.09.013

Cited by 13 publications

(5 citation statements)

References 12 publications

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“…Roll mill, attrition mill and centrifugal roll mill are a class of roller rubbing (Phat et al ., ), which generally applied to all kinds of materials. The principle of this kind of machines is the impacting, crushing, shearing and rubbing forces generated between the inner bottom, grinding medium and material (Abouzeid & Fuerstenau, ). High‐speed air flow pulverisation is widely used in chemical industry as well as thermally sensitive biomaterials (Xu et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Superfine grinding improves the bioaccessibility and antioxidant properties of Dendrobium officinale powders

Meng

Fan

et al. 2017

Int J of Food Sci Tech

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In herbal markets, an overwhelming majority the D. officinale are sold in spiral or spring form, and this kind of product would lead to the incomplete release of some nutrients. To increase the bioaccessibility of D. officinale, we report a method of pulverisation treatments including general and superfine grinding to reduce the particle size. In comparison with coarse D. officinale, the superfine ground D. officinale with particle sizes of <18 lm resulted in significant higher bulk density, better flowability and greater hydration properties. The protein and polysaccharide solubility of D. officinale increased significantly as its particle size decreased. The extract of D. officinale with a particle size of <18 lm showed that highest total phenolic and total flavonoid contents accompanied with the best antioxidant activity through all antioxidant assays compared with coarse ground D. officinale and D. officinale products.Superfine grinding of Dendrobium officinale Q. Meng et al.1441 † Span was determined by the equation: span = (d (90) À d (10) )/d (50) . ‡ Values are means AE standard deviation of three replications. § Means values in the same column with different letters are significantly different (P < 0.05).

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Section: Introductionmentioning

confidence: 99%

Superfine grinding improves the bioaccessibility and antioxidant properties of Dendrobium officinale powders

Meng

Fan

et al. 2017

Int J of Food Sci Tech

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“…The critical rotational speed for centrifuging in ball and rod milling can be calculated as follows (Abouzeid and Fuerstenau, 2012):…”

Section: Grinding Testmentioning

confidence: 99%

“…Some researchers have paid attention to the differences in the grinding mechanisms of ball and rod mills, which commonly results in the following variations: the shape properties of ground particles (Hicyilmaz et al, 2004;Ulusoy, 2008b;Ulusoy and Kursun, 2011), the residence time distribution (RTD) of particles (Gupta and Patel, 2015), the size distribution of ground products (Foszcz et al, 2018), and the flow characteristics of the tracer particles (dolomite, magnetite, and galena) (Abouzeid and Fuerstenau, 2012). AbouzeidFuerstenau (2012) reported that rod mill products have a narrow size distribution compared to those from a ball mill, which is partly attributable to the plug flow mode of the material transport in the rod mill and partly to the well-known bridging action of the rods.…”

Section: Introductionmentioning

confidence: 99%

Selective comminution and grinding mechanisms of spent carbon anode from aluminum electrolysis using ball and rod mills

Chen¹,

Zhou²,

Gao³

et al. 2022

Physicochem. Probl. Miner. Process.

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The recovery of spent carbon anode (SCA) materials plays important roles in environment protection and resources recycling, while this cannot be efficiently achieved without liberation. In this study, grinding characteristics of spent carbon anode from aluminum electrolysis in both ball mill and rod mill were analyzed, and compared based on the utilization of the selective Fuerstenau upgrading curves. In addition, the different grinding mechanisms of ball and rod milling were evaluated by analyzing the shape factor and surface roughness of the ground samples. Results of mineralogical characterizations indicated that carbon particles (d50 = 46.86 μm) presented in the SCA were closely associated with cryolite particles. At 5 min grinding time, the maximum selective comminution factor (β) values of ball milling and rod milling were 2.00 and 1.63, respectively, indicating a higher degree of selective comminution of SCA was achieved from ball milling. Comparisons of the valuable component content (cv, cum) of -125 μm ground particles and the shape characterizations of 74-125 μm ground particles generated from ball and rod milling manifest that a direct relationship exists between the degree of selective comminution and the grinding mechanism.

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“…Currently, drum mills are the most popular facilities for ore grinding. Their global share is more than 80 per cent [14], [15].…”

Section: Introductionmentioning

confidence: 99%

The ways to enhance durability and bearing capacity of the open gear drum mills

Vynohradov¹,

Карпенко²,

Lahoshna³

et al. 2021

Min. miner. depos.

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Purpose is substantiating ways to enhance durability and bearing capacity of open gears of ore-pulverizing drum mills as well as efficiency of engineering solutions concerning the increase in their unit power at the expense of drive improvement. Methods. Results of continual experiments and theoretical studies have been generalized as for the abrasion of working surfaces of open gear teeth of drum mills and factors influencing load distribution in terms of a tooth rim width. Findings. Comparative analysis between domestic mills and the best world-class products has been carried out. Ways of solving problems to design large-capacity mills with a gearbox drive have been demonstrated. Influence of hardness of working teeth surfaces on their durability has been evaluated quantitatively. The factors, governing load distribution in terms of tooth rim width, have been analyzed. Use of self-adjusting gear drives for open gears has been evaluated. Originality. Functional relation between stress-strain properties of working surface of teeth; the number of running-in modes, determined by operational conditions; and durability of open gear has been identified. The factors, influencing load distribution in terms of tooth rim width, have been considered. Practical implications. It has been shown that use of such open gears, where hardness of working surface of gear teeth is (500-600) H1B1 and that of a tooth rim one is (260-300) H2B2, makes it possible to provide almost wear-free operation. Moreover, it is the required condition for the performance of a tooth rim with two drive gears.

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Flow of materials in rod mills as compared to ball mills in dry systems

Cited by 13 publications

References 12 publications

Superfine grinding improves the bioaccessibility and antioxidant properties of Dendrobium officinale powders

Superfine grinding improves the bioaccessibility and antioxidant properties of Dendrobium officinale powders

Selective comminution and grinding mechanisms of spent carbon anode from aluminum electrolysis using ball and rod mills

The ways to enhance durability and bearing capacity of the open gear drum mills

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