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RECOVERY OF NICKEL FROM REVERBERATORY FURNACE SLAG BY SULFURIZATION AND FLOTATION

Willie Nheta

First published: 2019-06-20https://doi.org/10.5593/sgem2019/1.3/s04.127View metrics

Abstract

Due to depletion of high-grade ores, high cost of mining and environmental issues, many mines have reverted to retreatment of slags. The recovery of Nickel from reverberatory furnace slag using sulfurization and flotation was studied. Critical parameters such as sulfurization temperature, sulfurization agent (Gypsum containing 86.87% CaSO4) dosage and time were investigated for the sulfurization process and effect of collector type and dosage, pH, particle size and flotation time for the flotation process. It was found that the slag contained 0.37% Cu and 0.19 % Ni as Copper oxide and Nickel oxide and other mineral phases such as fayalite, cuprospinnel and pentlandite. Optimum conditions for sulfurization were addition 20g of gypsum, 8g of Coke at a temperature of 950 ? under inert environment (argon) in a tube furnace for one hour. All of the Nickel oxide was sulfurized to Nickel sulfide and Millerite. 88.3 % Nickel was recovered after flotation under optimum conditions of 0.20g/t Potassium amyl xanthate (PAX), 5 drops of Dowfroth 200, 80% passing 75 microns at a pH of 7 in a micro flotation cell. The recovery of Nickel sulphide was very much dependent on collector dosage.

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Publication details

Title
RECOVERY OF NICKEL FROM REVERBERATORY FURNACE SLAG BY SULFURIZATION AND FLOTATION
Authors
Willie Nheta
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings19th, Science and Technologies in Geology, Exploration And Mining
Publisher
STEF92 Technology
Year
2019
Pages
979-986
SWS Citekey
Nheta20194979986
ISSN
1314-2704
ISBN
978-619-7408-78-2
Language
en
Publication type
Conference Paper
Keywords
flotationNickelsulfurizationxanthateslag retreatment.
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