Synthesis of a copolymeric system and its flocculation performance for iron ore tailings

Anish Dubey, Abhay Shankar Patra, Abanindra Nath Sarkar, Abhirup Basu, Sunil Kumar Tripathy, A. K. Mukherjee, Atul Bhatnagar

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The medium grade iron ores contain high ultrafine fractions of soft slime which result in poor dewatering characteristics. Herein, a detailed study was conducted to assess the settling behaviour of iron slimes or tailings using a novel starch-based binary graft copolymeric flocculant (St-g-(pAAm-co-pSS)) and the performance was compared with four commercial reagents. The copolymer has been synthesized by grafting of acrylamide and sodium p-styrene sulfonate on starch using free radical polymerization. The polymer demonstrated outstanding settling behaviour with respect to settling speed and capacity to remove turbidity during iron-ore tailings flocculation as compared to other commercial reagents. An optimal dosage of synthesized reagent has been recommended based on the mud-level index and settling rate, for single-step and multi-step addition to the iron tailings slurry. The synthesized reagent has been assessed upon its capacity to produce clear overflow water and compaction of the solids.

Original languageEnglish (US)
Article number106848
JournalMinerals Engineering
Volume165
DOIs
StatePublished - May 1 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • Dewatering
  • Flocculation
  • Graft copolymer
  • Iron ore slime

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