Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display

Thermodynamic modelling, experiment, measurement, and characterization technique were used to evaluate the leaching process of yttrium (Y) elements from liquid crystal display (LCD) electronic waste (e-waste). Thermodynamic modelling using HSC 6.0 software revealed that the reaction of leaching out...

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Main Authors:	Ahmat, Farouq, M. Y. M., Yunus, Badhrulhisham, Abdul Aziz, Anwaruddin, Hisyam
Format:	Article
Language:	English
Published:	Universiti Malaysia Pahang 2018
Subjects:	TP Chemical technology
Online Access:	http://umpir.ump.edu.my/id/eprint/20946/ http://umpir.ump.edu.my/id/eprint/20946/ http://umpir.ump.edu.my/id/eprint/20946/ http://umpir.ump.edu.my/id/eprint/20946/1/Application%20of%20thermodynamic%20modelling%20and%20experimental%20investigation.pdf

id	ump-20946
recordtype	eprints
spelling	ump-209462018-06-26T04:31:25Z http://umpir.ump.edu.my/id/eprint/20946/ Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display Ahmat, Farouq M. Y. M., Yunus Badhrulhisham, Abdul Aziz Anwaruddin, Hisyam TP Chemical technology Thermodynamic modelling, experiment, measurement, and characterization technique were used to evaluate the leaching process of yttrium (Y) elements from liquid crystal display (LCD) electronic waste (e-waste). Thermodynamic modelling using HSC 6.0 software revealed that the reaction of leaching out Y with hydrochloric acid is endothermic thus absorbing heat and at the same time positive Gibbs free energy from temperature 273.15 K to 343.15 K and negative Gibbs free energy from temperature 353.15 K to 373.15 K. Thermodynamic data of the leaching processes with sulfuric and nitric acids show that the reactions are exothermic thus release heat and at the same time negative Gibbs free energy from temperature 273.15K and above. The leaching reaction with sulfuric and nitric acids identified to be reversible from temperature 273.15 K and above due to the negative entropy change, whereas the reaction was found irreversible for the hydrochloric acid solution due to the positive entropy change at the similar minimum temperature setting. The significance of reversibility versus irreversibility is their relationship to the efficiency. The equilibrium constant show that the leaching process with hydrochloric acid is less than 1 (Log K<1) from temperature 273.15 K to 343.15 K indicate that the backward reaction is favored while from temperature 353.15 K to 373.15 K have a positive equilibrium constant (Log K>1) thus indicate that forward reaction is favored. Leaching process with sulfuric and nitric acids shows that the positive equilibrium constant (Log K>1) which indicate that forward reaction is favored from temperature 273.15 K and above. The Pourbaix diagram modelling showed that Y dissolved in HCl at pH below 7 therefore strong reducing agents such as sulfuric acid (sulfide) can improve the dissolution of Y. Inductively coupled plasma mass spectroscopy (ICP-MS) results showed that only Y is viable to be efficiently leached from the studied LCD, e-waste either in a single-stage or in two-stage leaching mode. Sulfuric and nitric acids are found to be the most practical solutions in leaching out the Y element whereby around 0.00515 ppm and 0.00507 ppm of Y were dissolved in both solutions respectively based on the two-stages leaching approach. Universiti Malaysia Pahang 2018 Article PeerReviewed text en http://umpir.ump.edu.my/id/eprint/20946/1/Application%20of%20thermodynamic%20modelling%20and%20experimental%20investigation.pdf Ahmat, Farouq and M. Y. M., Yunus and Badhrulhisham, Abdul Aziz and Anwaruddin, Hisyam (2018) Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display. Journal of Chemical Engineering and Industrial Biotechnology (JCEIB), 3. pp. 17-25. ISSN 0126-8139 http://jceib.ump.edu.my/index.php/en/volume-3-docman/65-application-of-thermodynamic-modelling-and-experimental-investigation-of-leaching-yttrium-from-liquid-crystal-display DOI: https://doi.org/10.15282/JCEIB-V3-03.28/3/2018/3.3
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Ahmat, Farouq M. Y. M., Yunus Badhrulhisham, Abdul Aziz Anwaruddin, Hisyam Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
description	Thermodynamic modelling, experiment, measurement, and characterization technique were used to evaluate the leaching process of yttrium (Y) elements from liquid crystal display (LCD) electronic waste (e-waste). Thermodynamic modelling using HSC 6.0 software revealed that the reaction of leaching out Y with hydrochloric acid is endothermic thus absorbing heat and at the same time positive Gibbs free energy from temperature 273.15 K to 343.15 K and negative Gibbs free energy from temperature 353.15 K to 373.15 K. Thermodynamic data of the leaching processes with sulfuric and nitric acids show that the reactions are exothermic thus release heat and at the same time negative Gibbs free energy from temperature 273.15K and above. The leaching reaction with sulfuric and nitric acids identified to be reversible from temperature 273.15 K and above due to the negative entropy change, whereas the reaction was found irreversible for the hydrochloric acid solution due to the positive entropy change at the similar minimum temperature setting. The significance of reversibility versus irreversibility is their relationship to the efficiency. The equilibrium constant show that the leaching process with hydrochloric acid is less than 1 (Log K<1) from temperature 273.15 K to 343.15 K indicate that the backward reaction is favored while from temperature 353.15 K to 373.15 K have a positive equilibrium constant (Log K>1) thus indicate that forward reaction is favored. Leaching process with sulfuric and nitric acids shows that the positive equilibrium constant (Log K>1) which indicate that forward reaction is favored from temperature 273.15 K and above. The Pourbaix diagram modelling showed that Y dissolved in HCl at pH below 7 therefore strong reducing agents such as sulfuric acid (sulfide) can improve the dissolution of Y. Inductively coupled plasma mass spectroscopy (ICP-MS) results showed that only Y is viable to be efficiently leached from the studied LCD, e-waste either in a single-stage or in two-stage leaching mode. Sulfuric and nitric acids are found to be the most practical solutions in leaching out the Y element whereby around 0.00515 ppm and 0.00507 ppm of Y were dissolved in both solutions respectively based on the two-stages leaching approach.
format	Article
author	Ahmat, Farouq M. Y. M., Yunus Badhrulhisham, Abdul Aziz Anwaruddin, Hisyam
author_facet	Ahmat, Farouq M. Y. M., Yunus Badhrulhisham, Abdul Aziz Anwaruddin, Hisyam
author_sort	Ahmat, Farouq
title	Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
title_short	Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
title_full	Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
title_fullStr	Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
title_full_unstemmed	Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
title_sort	application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
publisher	Universiti Malaysia Pahang
publishDate	2018
url	http://umpir.ump.edu.my/id/eprint/20946/ http://umpir.ump.edu.my/id/eprint/20946/ http://umpir.ump.edu.my/id/eprint/20946/ http://umpir.ump.edu.my/id/eprint/20946/1/Application%20of%20thermodynamic%20modelling%20and%20experimental%20investigation.pdf
first_indexed	2023-09-18T22:30:31Z
last_indexed	2023-09-18T22:30:31Z
_version_	1777416254322114560

Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display

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