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Confined Bed Breakage of Fine Iron Ore Concentrates
Minerals ( IF 2.5 ) Pub Date : 2020-07-27 , DOI: 10.3390/min10080666
Túlio M. Campos , Gilvandro Bueno , Luís Marcelo Tavares

High-pressure grinding rolls (HPGR) have gained great popularity in the mining industry in the last 25 years or so. One of the first successful applications of the technology has been in iron ore pressing prior to pelletization. Piston-and-die tests can provide good insights on the material response in an HPGR. This work analyzed confined bed breakage of four iron ore concentrates under different conditions. Saturation in breakage of particles contained in the top size in the tests was observed to occur at specific energies of about 2 kWh/t, whereas full saturation in breakage, with no additional increase in specific surface area of the material, occurred at energies above about 6 kWh/t. An expression was proposed to characterize the propensity of a material to break under confined bed conditions. The phenomenology involved in confined bed breakage of such materials was then analyzed in light of the results.

中文翻译:

精铁矿精矿的密闭床破损

在过去的25年左右的时间里,高压研磨辊(HPGR)在采矿业中获得了极大的欢迎。该技术的首批成功应用之一是制粒前的铁矿石压制。活塞和模具测试可以为HPGR中的材料响应提供很好的见解。这项工作分析了四种铁精矿在不同条件下的密闭床破裂。在约2 kWh / t的比能下,观察到了测试中尺寸最大的颗粒的破裂达到饱和,而在高于约2 kWh的能量下发生了破裂的完全饱和,而材料的比表面积没有额外增加。 6千瓦时/吨 提出了一种表达式来表征材料在受限床条件下破裂的倾向。
更新日期:2020-07-27
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