Paste thickeners in India’s iron and steel industry

Jerold Johnson, Bhagabati Misra
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Abstract

Iron production in India has seen rapid growth over the last few years, significantly exceeding forecasts. This growth has accentuated several issues regarding management of the slimes, dewatering, and tailings storage facilities (TSF). The number of slime pelletising beneficiation plants has increased to produce pellets for domestic use and exports. Pellet plants vary in size from 1 to more than 8 Mtpa pellet production. Slime beneficiation can produce tailings with more than 90% passing 20 microns (µm). In light of recent world iron tailings disasters, there has been a focus on much lower risk tailings storage systems. Plants have significant obstacles to overcome in the management of these slime tailings; the tailings’ very fine particle size distribution (PSD) is notorious for poor filtration rates, small TSF areas are available, stream variability can greatly affect dewatering efficiency, and water management at the TSF in high rainfall, to name a few. Paste thickener technology, which provides solutions to several of these challenges, has entered the Indian iron market. The first installation was in 2015 at Shri Bajrang Power and Ispat Ltd Tilda pellet plant. This paper features additional Indian paste thickener sites, discussing dewatering variable feed streams, thickener operation and results, and methods of TSF management.
浆料增稠剂在印度钢铁工业中的应用
在过去几年里,印度的铁产量增长迅速,大大超过了预期。这一增长突出了有关泥石、脱水和尾矿储存设施(TSF)管理的几个问题。矿泥球团选矿厂的数量增加,生产供国内使用和出口的球团。颗粒厂的规模从1万吨到800多万吨不等。矿泥选矿产生的尾矿粒径通过20微米(µm)的可达90%以上。鉴于近年来世界范围内发生的多起铁尾矿灾害,开发低风险的尾矿储存系统已成为人们关注的焦点。工厂在管理这些矿泥尾矿方面需要克服重大障碍;尾矿的极细粒径分布(PSD)因过滤率差而臭名昭著,可用的TSF区域很小,河流变化会极大地影响脱水效率,以及高降雨时TSF的水管理,等等。糊状增稠剂技术已经进入印度铁市场,该技术为上述挑战提供了解决方案。第一次安装于2015年在Shri Bajrang Power和Ispat Ltd Tilda颗粒厂。本文介绍了另外的印度膏体浓缩厂,讨论了脱水可变进料流,浓缩机操作和结果,以及TSF管理方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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