FLOTATION
Demonstrating the size of the FLSmidth cell and showing it in place in the plant
of 0.071 % Cu and 26 % solids. The SuperCell particular FLSmidth’ s new nextSTEP™ also added an average of 6.2 minutes of flotation rotor / stator technology that it utilises. Testing residence time( 28.5 % increase in plant residence involved five metallurgical sampling campaigns time). The Enrichment Ratio ranged from 90 to in conjunction with laboratory kinetics and 115 at 9-12 % recovery. Tests showed the ability to measurements of air dispersion, bubble size, recover particles from a wide range of sizes. and solids suspension parameters.
Another paper by the same authors The residence time distribution( RTD) for all
( Evaluation of the FLSmidth nextSTEP™ three rougher rows was also executed, Installation at a South American Concentrator) simultaneously, using a fluorescein tracer test describes a test program carried out to evaluate on three flotation rows. The raw data was the hydrodynamic and metallurgical adjusted to account for background noise, and performance of a flotation circuit and in dead volume in the circuit. Using the corrected data sets, the mean
Blasting mats retention time, variance, and Peclet number were calculated for each row. BLASTING MATS should always Distribution of the feed be used to cover the blasting site in between the tested order to protect the surroundings rows has been against damage from flying rocks. quantified. Data from the
TD BERGMA’ s blasting mats are metallurgical produced of the most resistant parts campaigns of recycled truck tyres which are demonstrated that bound compact together with rows 1 and 2 recovered galvanized steel rope. These heavy more Cu than row 3
rubber mats can be used over and due to an extended over again( approx. 100 times). residence time. Testing
The weight of the blasting mat is sufficient to give effective results were compared protection against the debris from the explosions and will also with historical data. reduce the noise from the blasting. The highest quality Bergma’ s FLSmidth’ s flotation blasting mats are best for explosive, blasting, drilling and team knew it could demolition work. improve the energy efficiency of flotation by rethinking the rotor / stator
For more information contact: technology. So they
TD BERGMA teamed up with
Górki 24a, 82-500 Kwidzyn, Poland aerospace researchers
+ 47 920 34 482 or + 48 881 782 001 and changed the j. kraszewski @ bergma. pl www. bergma. pl hydrodynamics of the
flotation system.“ Smaller bubbles have better attachment properties than large ones. But if you increase aeration rate to improve throughput, the flotation cells produce larger, not smaller bubbles, so it’ s really not a straightforward proposition,” explains Product Manager of Flotation Asa Weber.
Flotation is about creating the proper energy dissipation rate in the cells, to obtain optimal contact between the bubbles and the particles and extracting the minerals.
“ We wanted to design a machine that enabled us to increase the air volume and reduce the bubble size at the same time and simultaneously optimise energy dissipation rate. So for the initial technology developmental phase we decided to team up with a range of experts in air dispersion; including aerospace researchers, surface chemistry researchers and the Center for Advanced Separation Technologies at Virginia Tech. We worked with a three-phase model replicating real world conditions,” says Weber.
The combination of mining industry academics and experts from the aerospace industry allowed the team to come up with an innovative design concept for the rotor / stator. The target was to create a new ultralowenergy flotation system and the team came up with the nextSTEP™ advanced flotation mechanism, featuring a new rotor / stator lowenergy technology.
The function of the rotor / stator is to make bubbles, suspend particles and create an environment for bubbles and particles to make contact.“ The key is to do it with the least amount of power possible. So we elongated the vane of the rotor and cut slots in the stator to optimise the geometry of the rotor / stator assembly,” Weber explains.
The new rotor is designed to produce ideal
26 International Mining | NOVEMBER 2017