Use of waste gypsum from hydrometallurgical plant for the recovery of nickel from a nickel slag by sulfurization

Nurse Chauke, Michel Kalenga Wa Kalenga, Willie Nheta

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

Disposal of waste in the metallurgical industry has become a challenge. Heaps of gypsum from hydrometallurgical plants using sulphates media are growing and pose an environmental problem. The current investigation focuses on the use of disposed gypsum from hydrometallurgical plants for Nickel recovery from slag. Sulfurization tests were carried out at different temperatures ranging from 600 0 C to 1250 0 C. XRD, XRF, ICP-MS and SEM-EDS were used for characterization. A silica crucible was used as a container placed in a tube furnace under argon gas to enhance the reaction. Nickel and Copper content in the slag were 0.75 and 1.16% respectively. The major phases were fayalite, cuprospinnel and nickel oxide. Results showed that the recycling of gypsum from hydrometallurgical plants was beneficial and the increase in temperature favored to convert nickel oxide into sulphide. Peacks decomposition has proved a number of sulphides have formed. However, above 1100 0 C the sulfurization decreased.

Original languageEnglish
Title of host publicationMaterials Science and Technology 2018, MS and T 2018
PublisherAssociation for Iron and Steel Technology, AISTECH
Pages1072-1080
Number of pages9
ISBN (Electronic)0873397681, 9780873397681
DOIs
Publication statusPublished - 2019
EventMaterials Science and Technology 2018, MS and T 2018 - Columbus, United States
Duration: 14 Oct 201818 Oct 2018

Publication series

NameMaterials Science and Technology 2018, MS and T 2018

Conference

ConferenceMaterials Science and Technology 2018, MS and T 2018
Country/TerritoryUnited States
CityColumbus
Period14/10/1818/10/18

Keywords

  • CaSO
  • Slag
  • Sulfurization
  • Temperature

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Materials Science (miscellaneous)

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