Gallium arsenate removal from waste waters

The aim of this paper is to study the loss of gallium (Ga) and arsenic (As) loss during the sedimentation of gallium arsenate (GaAsO4) from waste solutions of GaAs epitaxial production by chloride method. The solid wastes of this semiconductor manufacturing process are removed from technologica...

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Autores principales:	Baranov, Serghei, Cinic, Boris, Stavila, Vitalie
Formato:	article
Lenguaje:	EN
Publicado:	D.Ghitu Institute of Electronic Engineering and Nanotechnologies 2005
Materias:	Physics QC1-999 Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/496d928461a64feaa4ae5437cddcf8a7
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spelling	oai:doaj.org-article:496d928461a64feaa4ae5437cddcf8a72021-11-21T12:12:37ZGallium arsenate removal from waste waters 2537-63651810-648Xhttps://doaj.org/article/496d928461a64feaa4ae5437cddcf8a72005-03-01T00:00:00Zhttps://mjps.nanotech.md/archive/2005/article/3191https://doaj.org/toc/1810-648Xhttps://doaj.org/toc/2537-6365The aim of this paper is to study the loss of gallium (Ga) and arsenic (As) loss during the sedimentation of gallium arsenate (GaAsO4) from waste solutions of GaAs epitaxial production by chloride method. The solid wastes of this semiconductor manufacturing process are removed from technological equipment by dissolution in an acidic etching solution. In order to recover valuable Ga and very toxic As from these waste solutions we proposed to precipitate them as gallium arsenate. Experiments have been conducted to determine the migration of the two elements in filtrate and washing solutions as a function of pH for both model and real industrial wastes. It has been determined the optimal interval of pH for sedimentation, the losses of Ga and As present 0,01-0,053%. For model solutions the sedimentation is optimal in the range of pH from 3,2 to 4,3, while in the case of real waste solution this interval is 3,6-5,0. Comparative evaluation of the precipitation efficiency revealed that for model solutions the arsenic loss during the precipitation is higher (0,5%), and this can be explained by a different ratio of initial Ga3 and AsO4 3- in model and real solutions. The results described in this paper provide important guidelines for the sedimentation of gallium arsenate from acidic waste solutions and indicate an overall efficiency of the process that could lead to savings in cost and process time for industrial effluent treatment technologies. Baranov, SergheiCinic, BorisStavila, VitalieD.Ghitu Institute of Electronic Engineering and NanotechnologiesarticlePhysicsQC1-999ElectronicsTK7800-8360ENMoldavian Journal of the Physical Sciences, Vol 4, Iss 2, Pp 222-230 (2005)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronics TK7800-8360
spellingShingle	Physics QC1-999 Electronics TK7800-8360 Baranov, Serghei Cinic, Boris Stavila, Vitalie Gallium arsenate removal from waste waters
description	The aim of this paper is to study the loss of gallium (Ga) and arsenic (As) loss during the sedimentation of gallium arsenate (GaAsO4) from waste solutions of GaAs epitaxial production by chloride method. The solid wastes of this semiconductor manufacturing process are removed from technological equipment by dissolution in an acidic etching solution. In order to recover valuable Ga and very toxic As from these waste solutions we proposed to precipitate them as gallium arsenate. Experiments have been conducted to determine the migration of the two elements in filtrate and washing solutions as a function of pH for both model and real industrial wastes. It has been determined the optimal interval of pH for sedimentation, the losses of Ga and As present 0,01-0,053%. For model solutions the sedimentation is optimal in the range of pH from 3,2 to 4,3, while in the case of real waste solution this interval is 3,6-5,0. Comparative evaluation of the precipitation efficiency revealed that for model solutions the arsenic loss during the precipitation is higher (0,5%), and this can be explained by a different ratio of initial Ga3 and AsO4 3- in model and real solutions. The results described in this paper provide important guidelines for the sedimentation of gallium arsenate from acidic waste solutions and indicate an overall efficiency of the process that could lead to savings in cost and process time for industrial effluent treatment technologies.
format	article
author	Baranov, Serghei Cinic, Boris Stavila, Vitalie
author_facet	Baranov, Serghei Cinic, Boris Stavila, Vitalie
author_sort	Baranov, Serghei
title	Gallium arsenate removal from waste waters
title_short	Gallium arsenate removal from waste waters
title_full	Gallium arsenate removal from waste waters
title_fullStr	Gallium arsenate removal from waste waters
title_full_unstemmed	Gallium arsenate removal from waste waters
title_sort	gallium arsenate removal from waste waters
publisher	D.Ghitu Institute of Electronic Engineering and Nanotechnologies
publishDate	2005
url	https://doaj.org/article/496d928461a64feaa4ae5437cddcf8a7
work_keys_str_mv	AT baranovserghei galliumarsenateremovalfromwastewaters AT cinicboris galliumarsenateremovalfromwastewaters AT stavilavitalie galliumarsenateremovalfromwastewaters
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Gallium arsenate removal from waste waters

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