What are the operational points of heavy media beneficiation?

October 24, 2022

The main points of operation of heavy medium beneficiation are as follows:

(1) Before the selection, the ore should be crushed to the particle size range required for heavy medium selection. Because heavy medium beneficiation cannot effectively select the fine fraction, it is necessary to screen out the fine fraction before being selected. The slime will seriously interfere with the heavy media beneficiation process, so the slime should be washed off before being selected. Under normal circumstances, it is sufficient to spray water to the screen surface during sieving, but when the ore is cemented by clay , a special washing machine is set up for deliming.

(2) The weighting is required to be ground to a certain degree of fineness. When the weighting is in the form of a block, it is subjected to crushing and grinding, and then added to the suspension according to the required density of the suspension to prepare a suspension. Generally, the density δ of the weight is increased, and the physical density ρ of the suspension is required to be known, as long as the formula

Calculate the solid-liquid mass ratio m quality: m water (m quality is the mass of the weight, m water is the mass of water ) , and then can be freely formulated into any volume of suspension according to this ratio. For example, using density 5.0g / cm 3 Magnetic iron ore formulated density 2.5g /cm3 suspension, substituted into the above formula:

That is, the quality of magnetite: water quality = 3:1 , taking 3 parts of magnetite plus 1 part by mass of water to form a suspension that meets the requirements.

(3) The concentration of the ore should be kept stable and the density of the suspension should be stable when using the heavy medium concentrator for selection. In particular, the density fluctuation range of the suspension should not exceed ±0.02 . For this purpose, it is necessary to take frequent samples for measurement or to install an automatic control device to control the density of the suspension.

(4) The recovery and regeneration of heavy weight is the key operation of heavy medium sorting. The light and heavy products discharged from the sorter are carried with a large amount of resuspension. The simplest method is to sieve the medium out with a vibrating sieve. Often divided into two sections of screening, the first section of the screen out of the medium still retains the original nature, can be returned directly to use. In the second stage of sieving, water spray is required to wash off the weight of the adhered mass on the nugget. The mass fraction of the suspension obtained is small and contains more pollutants. According to the nature of the heavier mass, it can be used separately. Purification by magnetic separation, flotation or re-election, and then dewatering by means of hydrocyclone, inclined plate concentrating tank, etc., and then re-distributed and returned to the process for use.

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