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Eriez CrossFlow Separator is a highly efficient hydraulic classifier for the separation of material based on particle size, shape and/or density. This technology can also be used for desliming, counter-current washing and acid neutralization of minerals.
The CrossFlow separates particles based on hindered-settling principles providing an economical and efficient means of classifying material such as silica and frac sands, mineral sands and industrial minerals.
Ores containing a mixture of high- and low-density components can also be upgraded based on their difference in specific gravity. Examples include iron ore, and heavy mineral with silica contamination and run-of-mine coal containing various ash-forming components such as rock and pyrite.
The hindered-settling environment creates the optimum conditions for efficient counter-current washing to rinse, clean, and neutralize ore prior to secondary unit operations.
Applications include:
Unlike traditional teeter-bed technologies, the Eriez CrossFlow uses a unique "tangential" feed presentation system to introduce feed into the top of the separation chamber. This novel approach can provide unit capacities up to three times that of a conventional classifier and eliminates particle misplacement caused by excessive feed volume and plant fluctuations.
In the CrossFlow, feed particles descend against a rising flow of teeter water established by a uniform system of water injection pipes located in the base of the main separator housing. Based on the settling characteristics of the ore and the water addition rate, a fluidized bed of solids is established in the separator. Particles with a low settling velocity (fine/low density) that cannot penetrate the teeter bed are carried over the top of the separator with the bulk of the fluidizing medium. Particles with a high settling rate (coarse/high density) settle through the fluidized bed and are eventually discharged at a high solids content through the underflow control valve.
CrossFlow features
Traditionally, particle size and/or density cut-point has been controlled by adjusting only the fluidization flow rate and the relative level of the teeter bed. More recently, Eriez engineered a superior control system that improves metallurgical results by regulating the true density of the teeter bed through continuous measurements of differential pressure. This approach better handles the continuous changes in feed stock characteristics such as pulp density, mineralogy and particle size distribution. As a result, the CrossFlow is better able to deliver a continuously efficient separation.
*Please note that all capacities are in long tons.
Crossflow Separator - Eriez’ CrossFlow Separator is a highly efficient hydraulic classifier for the separation of material based on particle size, shape and/or density. This technology can also be used for desliming, counter-current washing and acid neutralization of minerals.
Fertilizer Applications - Eriez Flotation has developed several technologies that can improve the separation of fertilizer minerals through flotation. These technologies incorporate improved methods of air sparging and particle contacting for coarse, fine, and ultra-fine particles. For the coarsest particles, the Eriez HydroFloat ® is a proven process for the recovery of particles up to and exceeding 4-mm. Fine particles are best treated using Eriez Flotation’s proprietary SlamJet sparging system. For ultra-fine particles or where more intimate contacting is required, the CavTube™ sparging system can be employed.
Applications of the CrossFlow Teeter-Bed Separator in the U.S. Coal Industry - Teeter-bed (i.e., hindered-bed) separators are used throughout the mineral processing industry for both classification and density separation. The high capacity and sizing characteristics of these units make them ideal for feed preparation prior to coarse flotation (+0.100 mm) circuits.
Applications of the CrossFlow Separator in the US Coal Industry - Hindered-bed separators are recognized as low-cost, high-capacity devices for both classification and density separation; however, since their inception, there have been few significant advances in the fundamental technology
Industrial Applications of the CrossFlow Separator - Laboratory and pilot-scale test data have shown that the innovative feed presentation of the CrossFlow separator provides improved metallurgy when compared to traditional hindered-bed or teeter-bed classifiers.
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