Method for the dry beneficiation of wollastonite ores

Abstract

The invention relates to the beneficiation of mineral deposits and can be used for beneficiating wollastonite ores. The method for the dry beneficiation of a wollastonite ore involves the primary and secondary crushing of the ore, the material drying between said crushing stages, the X-ray fluorescent separation of the crushed material after the secondary crushing stage, the classification of the material according to grain-size categories immediately after the X-ray fluorescent separation by sequentially carrying out impact grinding, magnetic separation on a belt conveyor, and air sizing. Then, the method involves the magnetic separation on a roll-type separator for removing impurities from the different size wollastonite concentrate and the extraction of material flour particles at the primary and secondary crushing stages and during the impact grinding of the ore. All the extracted flour particles are delivered to one of the rolls of the roll-type separator, the wollastonite concentrate of one or more grain-sizes is dried and, then, the dried concentrate is exposed to electrostatic separation for removing impurities therefrom. Subsequently, the air sizing of the product received after electrostatic separation is carried out in order to divide said product into fractions having different grain-size. One or more product fractions are additionally crushed and electrostatic charge is removed. The proposed invention makes it possible to improve the product quality and to reduce wollastonite waste.

Description

technical field [0001] The invention relates to a method for beneficiation of mineral deposits, which can be used for beneficiation of wollastonite ore. Background technique [0002] Known methods of beneficiation of wollastonite ore include dry crushing and air sizing of the ore in an inertial cone crusher or autogenous mill similar to an "Aerofol" to scale it by 1.0 and 0.071 mm classification: the ones with a grade of +1.0mm are sent for re-crushing, the ones with a grade of -0.071mm are selected as the final wollastonite product, and the ones with a grade of -1.0+0.071mm are sent for magnetic separation to obtain garnet concentrate. Before wollastonite concentrate is extracted, the non-magnetic product undergoes frictional electrification, is heated to 150-170°C in a tube electric furnace, and then cooled to 100-110°C on the pan of a vibrating feeder. Set the electric field density to 3.5·10 5 -3.9·10 5 V / m, extraction of wollastonite concentrate and simultaneous extr...

AI Technical Summary

Problems solved by technology

[0015] Lack of additional drying of the material prior to electrostatic separation leads to agglomeration of the material particles; moreover, the presence of moisture during electrostatic separation hinders the polarization of the material particles, thereby reducing the separation quality

[0016] It should also be noted that the prototype method does not include a step to remove the electrostatic charge of the wollastonite particles, which is generated during electrostatic separation and grinding; coupling, and thus reduce product quality

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