采用新型球团絮凝装置提高悬浮液脱水性能

IF 5 2区 工程技术 Q1 ENGINEERING, CHEMICAL
Yuxuan Luo , Nilanka I.K. Ekanayake , Negin Amini , Ellen M. Moon , Peter J. Scales , Anthony D. Stickland
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引用次数: 0

摘要

矿石品位的下降和矿体中粘土含量的增加给采矿业带来了重大的脱水挑战,因为需要更精细的磨矿来释放目标矿物。这就产生了细矿物脉石,包括粘土矿物,这些矿物作为尾矿排出。尾矿通常用絮凝剂处理,以聚集细颗粒,改善沉降和渗透性。然而,絮凝形成强大的颗粒网络,降低了可压缩性,限制了浆体密度和滤饼水分。本研究展示了一种新型的立式螺旋制粒机原型,用于高岭土悬浮液的球团絮凝,旨在通过形成致密的球团集料来提高可压缩性和渗透性。采用水包油乳液和高分子絮凝剂粘合,将直径为1.4 μ m的高岭土颗粒聚合成厘米大小的颗粒,固体含量高达0.15 v/v (0.31 w/w)。采用综合脱水性能分析方法对球团的脱水性能进行了量化和建模。传统絮凝方法通常以牺牲可压缩性为代价来提高透气性,相比之下,球团絮凝既提高了可压缩性,又提高了透气性。增稠机模型表明,为了达到0.20 v/v (0.40 w/w)的底流固体浓度,使用颗粒状骨料的系统可以在比使用常规絮凝骨料高13倍的固体通量下运行。同样,为了达到0.40 v/v (0.64 w/w)的滤饼固体浓度,与传统的絮凝饲料相比,颗粒状集料的过滤面积减少了16%,过滤时间缩短了18%。这项工作强调了球团絮凝作为传统絮凝的一种有前途的替代方法,导致浓缩器性能的显着改善,并为矿物加工中处理细粒和富粘土尾矿的挑战提供了一个实用的解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improved suspension dewaterability using a novel pelleting flocculation device
The decline in ore grades and increasing clay content in ore bodies present significant dewatering challenges for the mining industry, as finer grinding is required to liberate target minerals. This results in the production of fine mineral gangue, including clay minerals, which are discharged as tailings. Tailings are typically treated with flocculants to aggregate fine particles, improving settling and permeability. However, flocculation forms strong particle networks with reduced compressibility, constraining thickened slurry density and filter cake moisture.
This study demonstrates a novel vertical screw pelletiser prototype for pelleting flocculation of kaolin suspensions, aimed at improving both compressibility and permeability by forming compact pelletised aggregates. Using an oil-in-water emulsion and a polymer flocculant for adhesion, kaolin particles with a Sauter diameter of 1.4 µm were aggregated and pelletised into centimetre-sized pellets with solids fraction up to 0.15 v/v (0.31 w/w).
The dewatering properties of the pellets were quantified and modelled using comprehensive dewaterability analysis. Compared to the conventional flocculation methods, which typically improve permeability at the expense of compressibility, pelleting flocculation improved both the compressibility and permeability. The thickener modelling showed that, to achieve an underflow solids concentration of 0.20 v/v (0.40 w/w), systems fed with pelletised aggregates could operate at a solid flux 13 times higher than those using conventional flocculated aggregates. Similarly, to achieve a filter cake solids concentration of 0.40 v/v (0.64 w/w), filters fed with pelletised aggregates required 16 % less filtration area and 18 % shorter filtration time compared to conventional flocculated feeds. This work highlights pelleting flocculation as a promising alternative to conventional flocculation, resulting in significant improvements in the thickener performance and offering a practical solution to the challenges of processing fine and clay-rich tailings in mineral processing.
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来源期刊
Minerals Engineering
Minerals Engineering 工程技术-工程:化工
CiteScore
8.70
自引率
18.80%
发文量
519
审稿时长
81 days
期刊介绍: The purpose of the journal is to provide for the rapid publication of topical papers featuring the latest developments in the allied fields of mineral processing and extractive metallurgy. Its wide ranging coverage of research and practical (operating) topics includes physical separation methods, such as comminution, flotation concentration and dewatering, chemical methods such as bio-, hydro-, and electro-metallurgy, analytical techniques, process control, simulation and instrumentation, and mineralogical aspects of processing. Environmental issues, particularly those pertaining to sustainable development, will also be strongly covered.
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