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Synthesis of galena (PbS) in silica gel composite particles by sulphidisation and hydrothermal reaction

Chemeca 2013: Challenging Tomorrow

Abstract: This paper reports the synthesis and characterisation of lead sulphide (PbS) in silica gel (amorphous quartz) as a binary composite particle, in an attempt of mimicking real ores. Silica gel was synthesised via an economic route sol-gel method using sodium metasilicate as a precursor. Lead sulphide particles in the gel were synthesised by using lead acetate and sulphide ion donor thioacetamide, via a hydrothermal reaction method. Lead sulphide particles were grown at hydrothermal temperature of 220 degreesC, where thioacetamide breaks down to release sulphur (S2-) ions to sulphidised lead from the acetate. The products were obtained in lumps which were ground and characterised by quantitative X-ray diffraction (QXRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). QXRD results showed that the silica gel is of low quartz, partially crystalline and predominantly amorphous. The XRD pattern for the PbS showed crystals of galena and a quantified grade of 1%. SEM image confirms that the shape of PbS synthesised were of perfect cleavage with strati form, multifacets of agglomerated composite particles with regular shapes and few cubic crystals of few nanometres to microns (about 10 mum). The EDX spectrum indicates that PbS was synthesised in amorphous quartz.

To cite this article: Fosu, Shadrack; Pring, Allan; Skinner, William and Zanin, Massimiliano. Synthesis of galena (PbS) in silica gel composite particles by sulphidisation and hydrothermal reaction [online]. In: Chemeca 2013 (41st : 2013 : Brisbane, Qld.). Chemeca 2013: Challenging Tomorrow. Barton, ACT: Engineers Australia, 2013: 454-458. Availability: <http://search.informit.com.au/documentSummary;dn=882199212739952;res=IELENG> ISBN: 9781922107077. [cited 25 Feb 17].

Personal Author: Fosu, Shadrack; Pring, Allan; Skinner, William; Zanin, Massimiliano; Source: In: Chemeca 2013 (41st : 2013 : Brisbane, Qld.). Chemeca 2013: Challenging Tomorrow. Barton, ACT: Engineers Australia, 2013: 454-458. DOI: Document Type: Conference Paper ISBN: 9781922107077 Subject: Lead ores--Metallurgy; Organic compounds--Synthesis; Hydrothermal deposits; Composite materials--Testing; Peer Reviewed: Yes Affiliation: (1) Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia, email: fossy008@mymail.unisa.edu.au
(2) South Australian Museum North Terrace, Adelaide South, Australia, email: Allan.Pring@samuseum.sa.gov.au
(3) Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
(4) Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia

Database: Engineering Collection