Flocculation-flotation of ultrafine hematite from quartz using anionic polyacrylamide as a selective flocculant

被引:3
作者
Eardley, Jackquline C. [1 ,2 ]
Ng, Wei Sung [1 ,2 ]
Forbes, Elizaveta [2 ,3 ]
Franks, George, V [1 ,2 ]
机构
[1] Univ Melbourne, Chem Engn, Parkville, Vic 3010, Australia
[2] ARC Ctr Excellence Enabling Ecoefficient Beneficia, Southbank, Australia
[3] Univ Queensland, Sustainable Minerals Inst, Julius Kruttschnitt Mineral Res Ctr, Indooroopilly, Qld 4068, Australia
基金
澳大利亚研究理事会;
关键词
Froth flotation; Fines; Selective flocculation; Hematite; Sodium hexametaphosphate; Aggregate; Polyacrylamide; IRON-ORES; FINES; ENTRAINMENT; PARTICLES; SEPARATION; STABILITY; BEHAVIOR;
D O I
10.1016/j.mineng.2025.109254
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Conventional flotation cells are widely used for concentrating iron ores, yet one major challenge remains - the low recovery rate of ultrafine particles, particularly when processing low-grade deposits. This study explores the application of anionic polyacrylamide (APAM) in hematite and quartz mixtures (D50: 1 mu m, feed grade: 27.2 % hematite) to selectively aggregate hematite for enhanced flotation recovery. The role of sodium hexametaphosphate (SHMP) was examined as a dispersant to prevent heterocoagulation and to enhance selective aggregation towards hematite, evaluating its effect on the combined flocculation-flotation performance. Detailed insights are provided into the interactions between each reagent combination with sodium oleate (NaOL) as collector, along with an analysis of the limitations of this approach. Flotation with NaOL alone resulted in a hematite recovery of 44.5%. The addition of APAM increased hematite recovery to 82.7%. There was limited improvement in grade due to increased quartz entrainment and entrapment within the aggregates. When combined with SHMP, hematite grade improved by 11.4% as SHMP reduced heterocoagulation between hematite and quartz, and reduced entrainment by regulating the froth. Over 99% hematite recovery was achievable with optimised reagent doses. Since SHMP also functions as a depressant, the dose must be optimised to avoid excessive froth destabilisation. Overdosing APAM resulted in overly hydrophilic flocs which negatively impacts recovery. Balancing the dosage of all three reagents is crucial for optimum results. The highest grade achievable was 45.2% due to quartz entrapment and entrainment which is difficult to minimise in conventional lab scale mechanical flotation cells when handling ultrafine minerals.
引用
收藏
页数:11
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