Second, for demand-side management, a feed hardness array is generated by mixing two normal distributions with different standard deviation and mean values, representing a hard and soft ore. And third, realistic SAG mill feeds are generated with geostatistical simulations.
If the hard ore only comes to the plant from time to time the options are many options, including: accept a reduced throughput for a short time (minimum capital case); increase …
BrainWave SAG mill is a unique control package using patented model-based predictive adaptive control technology. It is well known within the mining industry that effective grinding in a SAG mill depends largely on the loading of the mill. A mill con - taining too much material does not allow for adequate movement of the ore and balls within ...
was surprising that the Bond Rod Mill Wi average was 11.3 kWh/t. Since the ore is unusually soft, the Rod Mill Wi is probably irrelevant in determining required power for the SAG mill. Drop Weight Tests Drop Weight tests were done at Hazen and analyzed by Contract Support Services, Inc. Table 4: Summary of 6 JKTech Drop Weight Tests
For example, a 48 by 60 crusher will have a capacity in the order of 600 tph when crushing ore in a hard rock mine. Source: Jack de la Vergne ... to the SAG mill by 10mm will result in a 3-6% increase in SAG mill throughput, with the magnitude depending on the ore characteristics and the mill operating conditions; Source Ausenco ...
The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years, but the ability to simulate the effects of blending hard and soft components on mill performance remains quite limited.In an effort to quantify these effects for modelling purposes, a series of laboratory, pilot scale and full scale tests, using multi-component …
The ore is extremely hard in the SAG mill stage of the process and only moderately hard in the ball milling stage. This presents challenges ... Soft 3 samples 1, 8, 9 16.7 17.6 14.8 Soft ore in SAG is hard in ball mill. SAG, RM ~equal Feed F80 for Test 19 10 2 SAGDesign F80 is almost double rod mill Wi test.
Ore hardness plays a critical role in comminution circuits. Ore hardness is usually characterized at sample support in order to populate geometallurgical block …
Current advances in technology, mineral processing online soft sensors, and machine learning algorithms enable new ways to push the envelope to understand and optimize the grinding and flotation processes. The online estimation of the particle size distribution shape can be used to tailor the SAG mill feed by manipulating the feeders.
As one of the machines widely used in mining, a semi-autogenous grinding (SAG) mill can significantly improve the roughing efficiency of rock. But the SAG mill still faces the obstacles of significant energy consumption and empirical operation parameters. In order to obtain the optimal operation parameters of a SAG mill, in this paper, the …
Tracking the mill performance showed that the mill power consumption decreased from 9.49 to 6.63 kWh/t (a nearly 30% reduction), P 80 of the mill product decreased from 611 to 355 μm, and the mill fresh feed flow rate increased from 511 to 521 t/h by decreasing the feed ore hardness from 112 min to 58 min based on SAG power …
Tracking the mill performance showed that the mill power consumption decreased from 9.49 to 6.63 kWh/t (a nearly 30% reduction), P 80 of the mill product decreased from 611 to 355 μm, and the mill fresh feed flow rate increased from 511 to 521 t/h by decreasing the feed ore hardness from 112 min to 58 min based on SAG power …
Unfortunately I have a program for SAG mills and grinding circuits. Computational testing showed that: - Capacity of SAG Mills can increase to 10000 t/h. - The number of ball mills should be 2-4. - The capacity of the SAG mill with pre-crushing by 20-30% more than the SAG mill with the crashing critical size.
crushed ore is fed into a SAG/Ball mill circuit with a median size of approximately 12,000 microns. Most SAG Mills are operated in closed circuit with a screen. The screen fi lters undersized ore, normally minus ½ inch, to a ball mill discharge sump. The combined mill discharg-es are pumped to undergo classifi cation, normally via hydrocyclones.
The most recent version of the ag/sag mill model is based on that originally developed by Leung (1987). This has been subsequently modified to incorporate the effect of ball load, feed size and ...
The instrumentation installed on a SAG mill is integral to control. For example, the mill load and noise sensors are instruments that provide essential information for an …
Here both the hard ore and the soft ore (in the SAG mill) overlapped other hardness ranges for the Bond BM Wi database. Because the shape of these curves are so different proves that the data generated ... SOFT ORE HARD ORE SAG LIMITED ORE VERY HARD ORE . The division of this graph into 4 quadrants shows the main areas to …
Here both the hard ore and the soft ore (in the SAG mill) overlapped other hardness ranges for the Bond BM Wi database. Because the shape of these curves are …
operational relative-hardness. We applied the proposed methodology on two SAG mill datasets, of one year period each. Results show accuracies above 80% on both SAG mills at a short upcoming period of times and around 1% of misclassifications between soft and hard characterization. The proposed
20' EGL SAG mill, a Raptor 900 pebble crusher and two 24' x 39'6" ball mills. Each mill is equipped with a 2 x 8500HP dual pinion drive system. The plant was designed to process 1585 h mtpof SAG feed. From startup, the mill struggled to meet the required production rates. Over time, a major initiative that involved
"The static and dynamic models for autogenous (AG) and semi-autogenous (SAG) mills have been studied for decades. Though the effects of mixing soft and hard …
BrainWave SAG mill is a unique control package using patented model-based predictive adaptive control technology. It is well known within the mining industry that effective …
At mines, where ore has become more competent during the life of the mine (and ore rarely gets softer as the mines go deeper) or at operations, where the SAG mill …
Conversely for hard ore, mill speed is increased to input more energy to the process and improve the tumbling action to deliver the required grind. ... to assist with solids transport …
The value of this factor can vary from 0.1 to 2.5, the former value representing very soft ore and the latter very hard ore in the SAG mill. This was called a new …
Multi-component AG/SAG mill model. The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years, but the ability to simulate the effects of blending hard and soft ...