文件号 C20111216003913
标题 COMPARATIVE STUDIES ON BALLS VERSUS SPHEROIDAL TETRAHEDRONS WORKING MEDIA TO ORE GRINDING IN AN INDUSTRIAL DRUM MILL
A new working media for drum mills has been tested, composed of spheroidal tetrahedrons. The mass of the spheroidal tetrahedrons grinding media was equal to the mass of spherical grinding media of ? 80 mm. Because the working medium is a new one and it is a subject of patent, the authors will present only technological results of its action. The experimental work took account of the influence of various technological and structural parameters and properties of the material being milled. The most important of these are: 1. Filling the mill with working media – 40 per cent; 2. Uniform supply and maintaining a constant output consistent with the list data (specification) of the drum mill; 3. The raw material for milling was copper porphyry ore from Assarel mine (Bulgaria), taken from the stream feeding the mills in the concentration plant; 4. Density of the slurry in the mill was over 70 per cent; 5. Milling was carried out in an open circuit (no circulating load); 6. The grinding media of balls and spheroidal tetrahedrons were obtained by die forging (hot volume stamping); 7. Elements in both grinding media differ in mass not exceeding one per cent; Two series of five runs were done using each grinding media. Besides permanent monitoring of the technological parameters, representative samples were collected of the feeding ore and of the slurry flowing out of the mill. A sieve analysis was made of each survey sample. Results are averaged for each of the working media. Results were compared by: 8. newly formed size fraction – 0.08 mm, which is the difference between the percentage of this fraction in the ore feed and the slurry; 9. percentage of particles with a particle size suitable for flotation, size fraction – 0.2 mm, similarly defined as the difference between their contents in ore feed and slurry; 10. degree of milling/crushing, which is recorded by formula: S =(D_(av))/(d_(av)), where: S – degree of grinding; D_(av) is the average measured diameter of particles in the mill feed ore with particle size + 0,2 mm; d_(av) is the average measured diameter of particles in the slurry with particle size + 0.2 mm. Experimental data show that under equal other conditions, grinding media composed of spheroidal tetrahedrons ensures higher technological performance in the milling process compared to grinding media composed of balls. The newly formed estimated size fraction – 0.08 mm is averagely higher by 2.32 per cent, and flotation size fraction – 0.2 mm is higher by 5.868 per cent. The extent of milling was higher by two units (milling with balls is 10.1, while milling with spheroidal tetrahedrons it is 12.1). These positive results justify the extension of the research in view of optimising the technological parameters and increasing the efficiency of the working media of spheroidal tetrahedrons.
关键词 spheroidal tetrahedrons;;balls;;grinding;;drum mill
分类号 TD9
语种 eng
起始页 1299
结束页 1307
总页数 9
文章类型 C
作者 L Tzotzorkov;T Penchev;P Bodurov;L Kuzev
作者单位 ASAREL MEDET JSC, 4500 Panagyurishte, Bulgaria. Email: l.tsotsorkov@asarel.com;Sofia Technical University, 8 Kl Ohridsky Boulevard, 1797 Sofia, Bulgaria. Email: tzpenchevi@abv.bg;Sofia Technical University, 8 Kl Ohridsky Boulevard, 1797 Sofia, Bulgaria. Email: pbodurov@yahoo.com;Mining and Geological University, 1700 Sofia, Bulgaria. Email: lubokuzeve@yahoo.com
ISBN号
国际刊号
会议录/文集名Smarter processing for the future
出版者 Australasian Institute of Mining and Metallurgy (AusIMM)
会议名称 International mineral processing congress
会议时间 20100906-10
会议地点 Brisbane(AU)
会议次数 25th
会议主办者
处理单元 CN111001
库的源代码 CN111001
保留号 CDC02965000

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