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The analysis of the influence of ball sizes in SAG grinding hasnt been developed in detail by considering the effect on process parameters inside the mill, grinding efficiency or internal classification. Historically a conventional grinding reference has been made on
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Sag mill response to feed particle size . semiautogenous mill performance is greatly affected by the proportion of coarse rocks in the feed that combine with the balls to impart breakage energy to the mill contents. to a lesser extent, the feed size distribution also determines the proportion of critical size material in the mill which ...
Regarding the e ects of ore size distribution on sag mills performance is needed. in other line, ore size distribution has been measured using modelbased soft sensors casali et al., 1998 apelt et al., 2002 and laser scanning kaartinen and tolonen, 2008. however, image processingbased sensors are
216 effect of sag mill feed size distribution and ore . 216 effect of sag mill feed size sag mill load ball charge sag mill power draw was the relationship demonstrated improved mill performance as the sag.
Sag mill feed size distribution. a nral network model for sag mill control sag specific power range of about 3 to 9 kwht for this site the design of the ore stockpiling and conveying system contributes to fluctuating size distribution with significant shortterm segregation occurring under certain operating situations depending on ore type and ...
Size distribution curve for sag mill in quezon philippines. evaluating the effect of feed particles size and their hardness on the particle size distribution of semimore info ball mill grinding and particle size distribution oiort.org. the particle size distribution the mill. this is called the ball size factor and particle size ...
Of gratepulp lifter design in agsag mill discharge. the current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at various aperture sizes and radial positions. it also indicates that in ... on the grate is driven by the factors of ore filling, radial position and ...
This study aims to understand the material behaviour of ore inside a coarse ore stockpile by discrete element modelling. this is of importance since the stockpile is the last stage to control the size distribution of ore in the ore handling system before feeding the grinding circuit. an optimal size distribution is required for efficient grinding in an autogenous grinding ag mill.
Sensorbased ore particle sorting can be used to preconcentrate rom ore feed, sag mill scats and low grade or waste stockpiles. plant throughput increase, reduced operating costs and mine optimization should be considered in evaluating sorting as well as increased recovery in flotation and leach circuits.
A sag mill limiting condition, i.e., harder ore, or a ball mill limiting condition, i.e., softer ore exists. for example, a ratio of 11.5 or up to 12 would indicate a trend away from processing harder ore types and an increasing bias toward processing softer ore types,
Density, ball mill speed and grinding media consumption rate, water spray rate on the highfrequency screen, and feed pulp density to the screen. the performance of the ball mill varied with the ore properties. the effect of process parameters on ultrafines generation and power consumption in the ball mill is explained further. 724 chat online
The runofmine size distributions due to blasting have a great influence on the performance of a sag mill. in this paper, a mine case study was conducted where there are four primary geologic units and the material properties between the four units vary considerably.
Evolution of sag mill process control at the xstrata nickel raglan operation erik bartsch1, chief engineer ... of high grade nickel ore, plant capacity is currently approaching 1,200,000 tonnes per year due to ... mill feed was highly variable in terms of feed size, grade and hardness.
Sag mill feed size grinding mill china. sag mill feed size distribution onemine mining and minerals matches 101 110 of 646 showing 101 to 110 of 646 matches for sag mill feed size and screening of material from the sag mill feed conveyor has indied in sag mill throughput from finer feed .
The sag mill may be fed with rationed proportions of coarse and fine ore 177100mm. it was however possible to obtain a close approximation to the supplied size distribution by gyratory crushing at a 5 crusher setting. shown below truncated rosinrammler function plot 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1 10 100 1000 size pxi
3 sag mill 8 15 ball charge variable competency ore 4 high ball charge sag mill 15 to 25 ball charge incompetent ore 5 low ball charge sag mill, high mill speed. 4 ball charge, 90 nc a cross between ag and sag for competent, abrasive ores. as typically operated in rsa. 6 sag mill configurations 3, and 5 with recycle crusher
2.6 effect of ball mixture 37 2.6.1 ball size distribution in tumbling mills 37 2.6.2 milling performance of a ball size distribution 40 2.7 summary 41 chapter 3 experimental equipment and programme 43 3.1 laboratory grinding mill configuration 43 3.2 preparation of monosize grinding media 44 3.3 feed material preparation 46
Independently of ore domains. freeportmcmorans project amelunxen et al. 2011 the tradeoff economics of sag mill and hpgrbased circuits were primarily determined for the average ore hardness, and then the performance of the two circuits were modelled over the lom hardness and head grade plans, resulting in estimated throughputs,
The influence of mill speed and pulp density on the grinding efficiency 91 graph 2. particle size distribution for different mill speeds 68.8 solids 73.4 solids 75.9 solids ore solids density 3.1 3.1 3.1 dry feed rate kgh 289 288 287 speed rpm 35.31 35.11 35.00 vcrit 75.59 75.17 74.92 absorbed power kw 5.335 5.628 5.338
Mill contents of an autogenous industrial mill was measured in terms of size and mineral distribution, during a survey conducted at lkab operations in sweden. the breakage and transport in agsag mills was found to depend on the physical properties and proportion of the different components in the mill feed.
Liner design is becoming an increasingly more important tool for the agsag mill performance optimization. the golegohar iron ore concentration plant uses three 9 m 215 2.05 m autogenous mills ag in parallel in a dry operation. due to large variations in feed
Nowadays, experimental semiautogenous sag mill and dropweight test are used for evaluation of grinding circuit regarding changes in feed particle size distribution, size of the ball, speed of mill, prediction of energy required, and product size distribution for complete grinding in ag and sag mills. in this study, the effect of initial ...
Specic energy. the feed size distribution together with the ore characteristics hardness, lithology, alterations, etc. are the most important factors affecting the sag mills performance. some operations have recognised an opportunity in the relationship between feed size and mill performance and manipulate feed size to obtain
N2 in this article, alternative forms of optimizing the milling efficiency of a laboratory scale ball mill by varying the grinding media size distribution and the feed material particle size distribution were investigated. silica ore was used as the test material.
The estimated size distribution in the mill at the time of test 7 is based ... the average ore hardness of the feed. it . ... to worn balls was the study of effects of scats removal on sag mill ...
The most recent published contribution on the topic of sag mill aspect ratio dates to morrell 2007 with his paper quotthe effect of aspect ratio on the grinding efficiency of open and closed ...