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WOLLASTONITE WORK INDEX DETERMINATION
Abstract
As part of the studies aimed at the individuation of the best techniques for the beneficiation of a mineral of wollastonite, coming from an Italian deposit, the problem of the optimization of the milling step was also considered, since the industrial use of wollastonite usually involves a preventive fine grinding. Therefore, in order to evaluate the grindability characteristics of this mineral, in consideration of the lack of data available in literature, we proceeded to the determination of its Bond index through the standard method. The Bond work index represents the energy required to reduce 1 short ton (907 kg) of a mineral from a theoretically infinitely large size to the size of 100 microns and its knowledge allows to calculate the energy spent in a process of dimensional reduction of a solid, including the energy properly used for the fracturing of the material and the losses, such as the energy lost in the form of heat generated by friction, mechanical losses, etc. Although the domain of application of Bond's theory is narrow, it is of high interest to us since it corresponds to that of industrial grinding units. In this paper the procedure adopted, and the experimental results obtained are reported. A value of Wi of 8.33 kWh/sht was obtained, which ranks our solid, under the aspect of comminution resistance, on the border between a soft rock and a rock of medium hardness. The Bond index, thus determined, is valid for an industrial wet grinding carried out with a ball mill, operating in closed circuit with a mechanical classifier, with a circulating charge amounting to 250 %.
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Determining the Bond Efficiency of Industrial Grinding Circuits. GMG01-MP- 2021. Global Mining Guidelines Group (2021). https://gmggroup.org/wpcontent/uploads/2021/12/GUIDELINE__Determining-the-Bond-Efficiency-ofIndustrial-Grinding-Circuits_2021.pdf . Accessed May 2022.
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