Comparative analysis of volumetric compression test data of unoxidized ferruginous quartzite

The study aimed to model and analyze effect of fine grinding with varied volumetric compression on physical, mechanical and processing (grindability, concentratability) properties of unoxidized ferruginous quartzite. Volumetric compression was performed on INSTRON 300DX compression testing machine. The test subject was unoxidized ferruginous quartzite of current production in Kursk Magnetic Anomaly, exposed to volumetric compression under varied specific pressure (3, 3.5 and 4 N/mm2). The compression testing machine mode simulated destruction by high-pressure grinding rolls (HPGR). From the experimentation evidence, no selective dissociation takes pace along the boundaries of intergrowth between ore metallic and nonmetallic phases in fine grinding products of unoxidized ferruginous quartzite. Grinding with volumetric compression ensures maximal reduction in weighted average diameter of particles by 1.34 mm and prevalence of fine sizes in fine grinding products. The hardness factor on Protodyakonov’s scale and the specific work of grinding decrease by 0.9 and 0.65 kg·m/cm3, respectively. The analysis of process properties (grindability) exhibits an increase in the specific grinding capacity at stage I by 16 % with size of 0.071 mm at the relative grindability ratio of 1.16. The concentrates are produce using a reference material and the fine grinding products having the commensurable final sizes. Regarding the reference material, the product of specific compression pressure of 3 N/mm2 features the higher mass fraction of total iron by 0.78% and the increased degree of dissociation of metallic phase by 0.009. Thus, the increased specific pressure of volumetric compression produces no desirable results.

Gzogyan T. N., Gzogyan S. R. Comparative analysis of volumetric compression test data of unoxidized ferruginous quartzite. MIAB. Mining Inf. Anal. Bull. 2022;(4):43-55. [In Russ]. DOI: 10.25018/0236_1493_2022_4_0_43.

T.N. Gzogyan¹, Cand. Sci. (Eng.), Head of Laboratory, е-mail: gzogyan_t@bsu.edu.ru,
S.R. Gzogyan¹, Senior Researcher,
¹ Belgorod State National Research Universitеt, 308015 Belgorod, Russia.

T.N. Gzogyan, е-mail: gzogyan_t@bsu.edu.ru.

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