Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite
Removing pyrite from coal and pyrrhotite from pentlandite play a critical role in coal and nickel production, respectively, to meet the stringent restriction on SO2 emission. The present project investigates first the mechanism of xanthate adsorption on gold using Atomic Force Microscope (AFM), the...
Main Author: | |
---|---|
Other Authors: | |
Format: | Others |
Published: |
Virginia Tech
2014
|
Subjects: | |
Online Access: | http://hdl.handle.net/10919/35583 http://scholar.lib.vt.edu/theses/available/etd-110398-115411/ |
id |
ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-35583 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-355832020-09-29T05:46:59Z Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite Chen, Xianguo Mining and Minerals Engineering Yoon, Roe-Hoan Luttrell, Gerald H. Adel, Gregory T. Karmis, Michael E. surface chemistry gold pyrite pyrrhotite Removing pyrite from coal and pyrrhotite from pentlandite play a critical role in coal and nickel production, respectively, to meet the stringent restriction on SO2 emission. The present project investigates first the mechanism of xanthate adsorption on gold using Atomic Force Microscope (AFM), then the depression of pyrite and pyrrhotite using the synthetic polymers developed by Cytec Industries. The results show that for xanthate/gold system, dixanthogen is the only species that renders the surface hydrophobic. Chemisorbed xanthate is observed on the gold surface but is hydrophilic. The synthetic polymers may adsorb on pyrite and pyrrhotite possibly through the hydrophobic interaction between the hydrophobic moiety of the polymer and the mineral surface that has been hydrophobized by collector adsorption. The hydrophilic moieties of the polymer are exposed to the aqueous phase and render the surface hydrophilic. Master of Science 2014-03-14T20:47:24Z 2014-03-14T20:47:24Z 1997-08-23 1998-11-04 1999-12-14 1998-12-14 Thesis etd-110398-115411 http://hdl.handle.net/10919/35583 http://scholar.lib.vt.edu/theses/available/etd-110398-115411/ 1.PDF 2.PDF 3.PDF 4.PDF 5.PDF In Copyright http://rightsstatements.org/vocab/InC/1.0/ application/pdf application/pdf application/pdf application/pdf application/pdf Virginia Tech |
collection |
NDLTD |
format |
Others
|
sources |
NDLTD |
topic |
surface chemistry gold pyrite pyrrhotite |
spellingShingle |
surface chemistry gold pyrite pyrrhotite Chen, Xianguo Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite |
description |
Removing pyrite from coal and pyrrhotite from pentlandite play a critical role in coal and nickel production, respectively, to meet the stringent restriction on SO2 emission. The present project investigates first the mechanism of xanthate adsorption on gold using Atomic Force Microscope (AFM), then the depression of pyrite and pyrrhotite using the synthetic polymers developed by Cytec Industries. The results show that for xanthate/gold system, dixanthogen is the only species that renders the surface hydrophobic. Chemisorbed xanthate is observed on the gold surface but is hydrophilic. The synthetic polymers may adsorb on pyrite and pyrrhotite possibly through the hydrophobic interaction between the hydrophobic moiety of the polymer and the mineral surface that has been hydrophobized by collector adsorption. The hydrophilic moieties of the polymer are exposed to the aqueous phase and render the surface hydrophilic. === Master of Science |
author2 |
Mining and Minerals Engineering |
author_facet |
Mining and Minerals Engineering Chen, Xianguo |
author |
Chen, Xianguo |
author_sort |
Chen, Xianguo |
title |
Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite |
title_short |
Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite |
title_full |
Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite |
title_fullStr |
Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite |
title_full_unstemmed |
Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite |
title_sort |
control of surface chemistry of gold, pyrite and pyrrhotite |
publisher |
Virginia Tech |
publishDate |
2014 |
url |
http://hdl.handle.net/10919/35583 http://scholar.lib.vt.edu/theses/available/etd-110398-115411/ |
work_keys_str_mv |
AT chenxianguo controlofsurfacechemistryofgoldpyriteandpyrrhotite |
_version_ |
1719346465811202048 |