CrossFlow Classifier

A high capacity teeter-bed 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.

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:

NOVEL FEED PRESENTATION SYSTEM IMPROVES SEPARATION EFFICIENCY

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

  • High capacity
  • Precise, efficient classification
  • Improved efficiency with fluctuating and/or dilute feed streams
  • Easy, on-line cut-point control using true density measurement
  • Fully automated discharge control system
  • Dewatering cone for consistent underflow discharge characteristics

Laboratory-scale CrossFlow units are available for small-scale testing on Eriez' Lab Equipment website.

 

Applications:

  • PARTICLE CONCENTRATION

    PARTICLE CONCENTRATION

    Hindered-bed separators can concentrate particles based on size, density and shape. With feed stocks having a relatively tight size distribution, separations based on density and shape can be successfully achieved.

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  • SIZING/CLASSIFICATION

    SIZING/CLASSIFICATION

    Minerals can be separated based on particle diameter when treating feed stocks having a consistent density but a wide size distribution.

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  • WASHING

    WASHING

    In the CrossFlow separator, particles settle against a countercurrent flow of fluidization water. As a result, this quiescent, plug-flow system provides an excellent method for rinsing, cleaning and washing material.

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Applications of the CrossFlow Teeter-Bed Separator in the US Coal Industry

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Design, Operation, and Control of a Teeter-Bed Hydroseperator for Classification

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CrossFlow Brochure

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Fertilizer Hydrofloat Brochure

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Photos


Advances in teeter Bed control technology

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.


CROSSFLOW SEPARATOR SPECIFICATIONS

MODEL NUMBERDESCRIPTIONDIMENSIONS (W x L x H)APPROX. WEIGHTCAPACITY*
  MMINKGLBSSIZING (T/H)DENSITY (T/H)
XF-50 Laboratory Unit 50 x 100 x 710 2.0 x 4.0 x 28.0 20 45 0.05 - 0.13 0.05 - 0.08
XF-100 Pilot Unit 50 x 200 x 900 2.0 x 8.0 x 35.5 70 150 0.2 - 0.5 0.2 - 0.3
XF-200 Pilot Unit 220 x 410 x 1240 8.8 x 16.0 x 49.0 95 210 1.0 - 2.6 1.0 - 1.5
XF-450 Pilot/Industrial 460 x 460 x 1470 18 x 18 x 58 400 880 4-10 4 - 6
XF-600 Pilot/Industrial 610 x 610 x 2130 24 x 24 x 84 570 1,255 7-18 7 - 11
XF-900 Industrial 910 x 910 x 2380 36 x 36 x 94 1090 2,400 16 - 14 16 - 25
XF-1200 Industrial 1220 x 1220 x 2700 48 x 48 x 106 1620 3,570 29 - 73 29 - 44
XF-1500 Industrial 1520 x 1520 x 3460 60 x 60 x 148 1950 4300 45 - 114 45 - 68
XF-1800 Industrial 1840 x 1840 x 4090 72 x 72 x 161 3520 7,765 65 - 164 65 - 98
XF-2100 Industrial 2140 x 2140 x 4670 84 x 84 x 184 4315 9,510 89 - 223 89 - 134
XF-2450 Industrial 2440 x 2440 x 5280 96 x 96 x 208 5400 11,900 116 - 291 116 - 175
XF-2700 Industrial 2740 x 2740 x 5280 108 x 108 x 230 6510 14,355 147 - 368 147 - 221
XF-3050 Industrial 3050 x 3050 x 6430 120 x 120 x 253 7750 17,090 182 - 455 182 - 273
XF-3350 Industrial 3350 x 3350 x 7040 132 x 132 x 277 9550 21,055 220 - 550 220 - 330
XF-3650 Industrial 3660 x 3660 x 7620 144 x 144 x 300 10,855 23,935 262 - 655 262 - 393
XF-4250 Industrial 4270 x 7270 x 8790 168 x 168 x 346 13,470 29,700 356 - 891 356 - 535
XF-6000 Industrial 3050 x 6710 x 6430 120 x 264 x 253 17,465 38,500 727 - 1818 727 - 1091
*Please note that all capacities are in long tons.