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ALUMINIUM SMELTER ANODE WASTE BOND INDEX DETERMINATION
Abstract
As part of the experimental studies carried out in the Department of Civil, Environmental Engineering and Architecture of the University of Cagliari, to identify the best techniques for recovering of combustible materials, contained in the waste resulting from the dismantling of the anodes of spent electrolytic cells used in the production of primary aluminium, to be concentrated by flotation, work was first carried out to reduce the size of the waste, in order to give it a particle size that would allow it to be fed to a flotation process and to improve the liberation degree of the carbon particles to be separated. Since the Bond-s work index is an important factor in the design of the comminution circuits, in order to evaluate the grindability characteristics of the aluminium smelter anode scrap and, consequently optimize the grinding step, we proceeded to determine its Bond Index using the standard method. Bond's work index represents the energy required to reduce one short ton (907 kg) of a solid from an infinite size to 100 microns. Bond's energy law uses this index to predict the energy required to reduce the solid's size, which is the sum of the energy used to fracture the material and energy losses, such as mechanical losses occurring in comminution equipment or energy lost in the form of heat generated by attrition. A value of 11.07 kWh/sht was obtained for the Wi. This value is characteristic of rocks of medium hardness in terms of resistance to comminution. The Bond index obtained is valid for an industrial wet grinding process using a ball mill operating in a closed circuit with a mechanical classifier and a circulating charge of 250%.
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Determining the Bond Efficiency of Industrial Grinding Circuits. GMG01-MP-2021. Global Mining Guidelines Group (2021). https://gmggroup.org/wp-content/uploads/2021/12/GUIDELINE__Determining-the-Bond-Efficiency-of-Industrial-Grinding-Circuits_2021.pdf. Accessed May 2022.
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