| INVESTIGATION OF SELECTIVE DISINTEGRATION FEASIBILITY OF GOLD-BEARING ORES Nadezhda Nikolaeva1; Tatyana Aleksandrova2; 1NATIONAL MINERAL RESOURCES UNIVERSITY, St. Petersburg, Russian Federation; 2NATIONAL MINERAL RESOURCES UNIVERSITY, Sain-Peterburg, Russian Federation; PAPER: 356/Nonferrous/Regular (Oral) SCHEDULED: 17:10/Tue. 29 Nov. 2022/Arcadia 2 ABSTRACT: New ore-processing plant projects often face problems in processing more complex and fine-grained minerals, resulting in additional costs and lengthening the crushing and grinding schemes to sufficiently unlocking. This trend could lead to an increase in energy consumption by a factor of 4 or more by 2030 compared to today. Already today about 2% of the electricity produced worldwide is used for this purpose. Thus, reduction of specific electric power consumption in processes of disintegration and enrichment of mineral raw materials is the actual task, taking into account the tendency to economy of natural resources, and also decrease impact on environment at processing of mineral raw materials [1-2]. One of decision way of problem is selective disintegration. A reasonable application of selective disintegration would not only allow the rock mass to be broken down to the required size, but also preconcentration at the classification stage to produce a pre-concentrate and to discharge the waste rock to the tailings [3-4]. Gold ores from the Bamskoe deposit were chosen as the object of study. Analysis of the material and chemical composition was carried out using atomic absorption, X-ray fluorescence method (Shimadzu EDX-7000). For mineralogical studies, optical methods of analysis, electron microscopy etc. were used in the work. Morphometric indicators were studied using computed tomography (SkyScan-1173 microtomograph). Experimental investigations were carried out on various installations: jaw crusher, roller crusher, impact crusher, ball mill, JK Drop Weight tester, Bond impact test, Bond ball and rod mill, Mastersaizer laser diffractometer, etc. Based on the strength and disintegration test data on mineralogical, textural and structural and physical properties of the minerals and on studies of ores crushing from the Bamskoe deposit in different types of crushers, it was found that rock-forming minerals are concentrated in large classes, especially in product of impact crushers (up to 81.85% of silica minerals in class - 4 + 2 mm). Based on the data obtained on testing of strength properties and disintegration indices from mineralogical, textural and structural and physical-technological properties of minerals and studies conducted on crushing ores of the Bamsky deposit in different types of crushers, it was found that the products of all crushers are characterised by a predominance of -4+2 mm class. As silica-minerals are the main rock-forming minerals, it was decided to look at the distribution of Si by size classes. In analysing the distributions of silica minerals, it was found that the extraction of silica minerals was maximised for the -4+2 mm grain size class. However, the impact crusher products are characterised by the highest recovery of silica minerals in this class (up to 81.85%). These results suggest that the impact crusher at the crushing stage can selectively break down this type of mineral at the fusion boundaries. This work was supported by the Russian Science Foundation (Рroject No. 19–17–00096). References: [1] Aleksandrova, T. N., Nikolaeva, N. V., Lvov, V. V., & Romashev, A. O. (2019). Ore processing efficiency improvements for precious metals based on process simulations. Obogashchenie Rud, 2019(2), 8-13. doi:10.17580/or.2019.02.02. [2] Morrell,S., 2008, A method for predicting the specific energy requirement of comminution circuits and assessing their energy utilisation efficiency, Minerals Engineering, Vol. 21, No. 3. [3] Hopunov E. A. Selective destruction of mineral and anthropogenic raw materials (in beneficiation and metallurgy). - Yekaterinburg: UIPC LLC, 2013. - 429 p. [4] Hesse, M., Popov, O., & Lieberwirth, H. (2017). Increasing efficiency by selective comminution. Minerals Engineering, 103-104, 112-126. doi:10.1016/j.mineng.2016.09.003. |
