Increasing the Performance of Wet Grinding Circuit of the Golgohar Iron Ore Complex
Message:
Abstract:
Wet separation circuit of the Golgohar iron ore plant includes comminution by overflow ball mills and separation by low intensity magnetic separators. The average sulfur content of the concentrate is more than 1. 2 %، which is higher than allowable limits for de-sulfurization and pelletizing plants (0. 8 % and 0. 1%، respectively). This problem is due to the low liberation degrees of sulfur bearing minerals (Pyrite) discharging the ball mills. In this research، the optimum product size (P80; 80% passing size) to achieve the acceptable level of sulfur in the product by Davis tube test was found to be 100 microns. In order to increase the grinding efficiency and to achieve the desired degrees of freedom، the ball charge level and percent solids were used as the main manipulated variables. At the 33% ball charge and percent solids of 68، mill product size reached 106 microns from the original value of 137 microns. Changes، which were implemented in whole circuit، included increasing percent solids from 47 to 65، increasing ball charge level from 27 to 33 volumetric percent and adding 20 mm diameter steel balls in to mill No. 2 with the usual 30mm balls. Mean residence time of materials in ball mill were determined by tracing method to be about 8 minutes and was used to determine the time needed to achieve stability. Sampling over a period of a few months in the plant indicated that the product size decreased to 110 microns with 95 % confidence. After implementation of changes in the plant، due to finer mill discharge، the sulfur reduction criterion (ratio of feed sulfur content and wet concentrate) increased by 19% (relative).
Language:
Persian
Published:
Journal of Mining Engineering, Volume:10 Issue: 27, 2015
Pages:
61 to 67
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