Reducing the viscosity of concentrated iron ore slurries with composite additives for quality upgrade, reduced power, safer tailings storage and smaller environmental footprint

Yee-Kwong Leong, Jason Drewitt, Scott Bensley

Research output: Chapter in Book/Conference paperConference paper

Abstract

The use of relatively cheap composite additives to separate impurities and reduce the viscosity of concentrated iron ore slurries, if adopted for similar types of iron ores to those tested, might upgrade the quality of iron ore, and reduce water use and the size of tailings dams. These composite additives based on NaOH and phosphate-based chemicals, reduced the viscosity and yield stress of these slurries by more than 90%. It separates the impurities particularly clay minerals from iron oxide particles by electric double layer repulsion enhancing the beneficiation performance. The ease of significant yield stress enhancement of dispersed concentrated tailings by the addition of low cost lime was demonstrated. High yield stress tailings are much less dangerous in the event of a dam wall failure due to slow flow and continually increasing yield stress as they gather more soil material along their flow path. In this paper we suggest how composite additives of NaOH and phosphatebased chemicals can be used to effectively reduce the viscosity and enhance impurity separation meeting all the environmental requirements in terms of pH and chemical leachate.
Original languageEnglish
Title of host publicationIron Ore 2019
Subtitle of host publicationOptimising value
Place of PublicationAustralia
PublisherAusIMM The Minerals Institute
Number of pages6
ISBN (Print)9781925100860
Publication statusPublished - 2019
EventIron Ore 2019: Optimising Value - Perth, Australia
Duration: 22 Jul 201924 Jul 2019
https://ironore.ausimm.com/

Conference

ConferenceIron Ore 2019
CountryAustralia
CityPerth
Period22/07/1924/07/19
Internet address

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