There are many mineral grading methods and spiral classifier is the most primitive grading equipment. Spiral classifier is generally applied for grading the discharged ores in a period of grinding.
The mineral powders that come from the ball grinding equipment are not graded and come through the magnetic separation directly, so that the particle sizes of ore powders are uneven. The coarse grains has lower ore grade. Super fine grains has high ore grade, but the magnetic field strength is low and adsorption ability is poor. The high frequency vibration screen can be used for gradation and the medium ores can come through the magnetic separation but the premise is that the worn of the high frequency separation is not so serious. Reducing the content of over-grinding minerals is the most effective method to improve mill production, reduce power consumption and improve iron concentrates powder recovery rate.
Production process improvement can make the products get a good price. Then through equipment technical renovation, the production power consumption of mining machinery is decreased by more than 25% and the yield is increased by 30% or so. The comprehensive economic indexes reach the international advanced level, and the enterprise economic benefit is improved, and the competitive power of enterprises is also improved. These will create good conditions for the future development of the enterprise.
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