scholarly journals INFLUENCE OF PARAMETERS OF EXPLOSIVE DESTRUCTION OF MINING BLOCKS OF COMPLEX GEOLOGICAL STRUCTURE ON THE PREPARATION OF THE MINING MASS FOR PROCESSING

2018 ◽  
pp. 68-74
Author(s):  
К.V. Babii
Keyword(s):  
Particle Size ◽  
Rock Mass ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Iron Ore ◽  
Geological Structure ◽  
Contact Zones ◽  
Complex Geological Structure ◽  
A Charge ◽  
Explosive Destruction

Purpose: to investigate the influence of the parameters of explosive destruction of mining blocks of complex geological structure on the production processes of mining and processing of iron ore. Determine the stability of the escarpment slopes during excavation of rocks in ore mining blocks with barren layers. Results. The analysis of geophysical methods for studying the structure of deposits. It is proposed to use the magnetic susceptibility method for well logging. The structure of mining blocks of a complex geological structure with contact zones "ore - host rocks" was investigated. It has been proven that for the effective use of equipment for the pre-enrichment of ore in a quarry there are conditions: the regulation of the granulometric composition of the rock mass and the reduction of ore splices with overburden rocks. It is proposed to use a charge design of an explosive with inert gaps or a charge section of a cumulative action in the explosive destruction of rocks with contact zones. The influence of parameters of explosive destruction of mining blocks of complex geological structure on the formation of technological complexes of ore beneficiation in quarries is established. The dependence of the factor of stability of slopes of slopes during excavation of rocks, depending on the geological parameters. Scientific novelty. The regularities of changes in the parameters of the ore mass flow (medium piece and oversize) are established depending on the diameter of the drilling-blast wells, which allows you to adjust the particle size distribution. Practical significance. Based on the established patterns and improvement of the design of well charges, their influence on the quality of the blown-up rock mass in the ledges of a complex geological structure has been substantiated, which makes it possible to form the corresponding technological complexes of ore dressing in quarries. The result is a significant increase in the productivity of the technological equipment of the mining enterprise and the profitability of iron ore mining. Key words: quarry, ledge, complex geological structure, downhole charge structures, particle size distribution.

Influence of particle size distribution of iron ore fines on liquefaction during marine transportation

2020 ◽  
Vol 373 ◽  
pp. 301-309
Author(s):  
Debora Dias Costa Moreira ◽  
Charles Aran Sabel dos Santos ◽  
André Luiz Amarante Mesquita ◽  
Davi Carvalho Moreira
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Iron Ore ◽  
Marine Transportation ◽  
Iron Ore Fines

Influence of nature and particle size distribution on granulation of iron ore mixtures used in a sinter strand

2003 ◽  
Vol 30 (6) ◽  
pp. 447-460 ◽  
Author(s):  
A. Formoso ◽  
A. Moro ◽  
G. Fernández Pello ◽  
J. L. Menéndez ◽  
M. Muñiz ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Iron Ore ◽  
Sinter Strand

scholarly journals Particle Size Distribution of Cemented Rockfill Effects on Strata Stability in Filling Mining

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 407 ◽  
Author(s):  
Jiangyu Wu ◽  
Meimei Feng ◽  
Jingmin Xu ◽  
Peitao Qiu ◽  
Yiming Wang ◽  
...  
Keyword(s):  
Particle Size ◽  
Rock Mass ◽  
Particle Size Distribution ◽  
Coal Seam ◽  
Size Distribution ◽  
Longwall Mining ◽  
Poisson Ratio ◽  
Triaxial Compression ◽  
Friction Angle ◽  
Economic Benefits

It is of great significance for engineering safety, economic benefits, environmental protection, and sustainable development to investigate the strata stability in filling mining with cemented rockfill. Consequently, this paper is based on a specific coal mine where we applied the fully-mechanized longwall mining and filling and designed a cemented rockfill material for which the particles satisfied the Talbot gradation. Uniaxial and triaxial compression experiments were carried out on the cemented rockfill specimen, which obtained the relations between the mechanical parameters (Poisson ratio, elastic modulus, compressive strength, cohesive force, internal friction angle, and tensile strength) and the particle size distribution of the aggregate. The excavation and filling processes in the coal seam were simulated based on the numerical software FLAC3D. The characteristics of the displacement and stress fields of the strata when the goaf was filled by cemented rockfill with different granule gradations were discussed. The influences of the particle size distribution and mining distance on the maximum subsidence displacement of the coal seam roof, internal stress of the backfill, and the stress of the rock mass in the coalface were analyzed. The feasibility and effectiveness of the filling mining with cemented rockfill to protect the integrity of the overlying strata were discussed. The results showed that optimizing the particle size distribution of the aggregate in cemented rockfill could increase the loading capacity of the backfill to improve the filling effect, effectively control the strata movement, and decrease the stress of rock mass in the coalface to reduce the potential danger.

scholarly journals The Application of Numerical Taxonomy Technique in the Iron Ore Flotation to Determine Appropriate pH and Particle Size Distribution

2020 ◽  
Vol 13 (4) ◽  
pp. 827-836
Author(s):  
Rasoul Khosravi ◽  
Fahimeh Dehghani ◽  
Hossein Siavoshi ◽  
Amir Pazoki ◽  
Reza Jahanian ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Numerical Taxonomy ◽  
Iron Ore

Justification of parameters and technology of drilling and blasting operations to ensure the required lumpiness

2021 ◽  
pp. 110-115
Author(s):  
V.V. Egorov ◽  
A.N. Volokitin ◽  
N.V. Ugolnikov ◽  
A.V. Sokolovsky
Keyword(s):  
Particle Size ◽  
Rock Mass ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Design Stage ◽  
Production Cycle ◽  
Lump Size ◽  
Optimal Technology ◽  
Average Size ◽  
The Cost

The practice of mining and blasting operations both during the development of a mineral deposits, and at the mine design stage, often involves the question of selecting the technology options and operation parameters. Virtually all recommendations for selecting the best production option are based on minimizing the total costs for the entire technological cycle of mining activities. In most cases the optimal technology and parameters of mining and blasting operations depend on the commercial, maximum permissible and average size of the blasted rock mass, which are determined by the type and capacity of the mining haulage equipment. Therefore, the total costs will mainly depend on the commercial or average lump size and the cost of mining transport equipment. The article presents a methodology to select the best technological option for the drilling and blasting operations to obtain the optimal lumpiness (particle-size distribution) of the blasted rock. The optimal range of lumpiness is defined by the total minimum costs for the entire production cycle of mining and processing of minerals. In order to select a rational technology of drilling and blasting and to calculate their parameters it is proposed to take into account the integral criteria of lumpiness in addition to the average lump size. For this purpose, we studied the particle size distribution in the rock mass and in the muck piles.

Investigation on Iron Ore Grinding based on Particle Size Distribution and Liberation

2020 ◽  
Vol 73 (7) ◽  
pp. 1853-1866
Author(s):  
Harish Hanumanthappa ◽  
Harsha Vardhan ◽  
Govinda Raj Mandela ◽  
Marutiram Kaza ◽  
Rameshwar Sah ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Iron Ore

Particle size distribution of metallic iron during coal-based reduction of an oolitic iron ore

2014 ◽  
Vol 31 (3) ◽  
pp. 169-174 ◽  
Author(s):  
Yuexin Han ◽  
Yongsheng Sun ◽  
Peng Gao ◽  
Yanjun Li ◽  
Yufan Mu
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Metallic Iron ◽  
Iron Ore ◽  
Oolitic Iron Ore
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