Kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions
The kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions were investigated. The effects of stirring, temperature, and particle size, as well as of the hydrogen peroxide and phosphoric acid concentrations were studied. The effect of phosphate ion addition was also examined....
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| Format: | Article |
| Language: | English |
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Serbian Chemical Society
1999-12-01
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| Series: | Journal of the Serbian Chemical Society |
| Subjects: | |
| Online Access: | http://www.shd.org.yu/HtDocs/SHD/Vol64/No12-Pdf/V64-No12-04.zip |
| _version_ | 1818238043346173952 |
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| author | VALENTINA DIMITRIJEVIC MILAN ANTONIJEVIC MILE DIMITRIJEVIC |
| author_facet | VALENTINA DIMITRIJEVIC MILAN ANTONIJEVIC MILE DIMITRIJEVIC |
| author_sort | VALENTINA DIMITRIJEVIC |
| collection | DOAJ |
| description | The kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions were investigated. The effects of stirring, temperature, and particle size, as well as of the hydrogen peroxide and phosphoric acid concentrations were studied. The effect of phosphate ion addition was also examined. The oxidation kinetics was found to follow a shrinking core model, with the surface chemical reaciton as the rate-controlling step. This is in accord with an activation energy of 57 kJ mol-1 and a linear relationship between the rate constant and the reciprocal of the particle radius. The reaction order with respect to the hydrogen peroxide concentration was found to be equal to unity. Variation of the phosphoric acid concentration had practically no effect on the rate of pyrite oxidation. Addition of the phosphate ion in the relatively low concentration range (0.005-0.1 mol dm-3) had a highly negative influence on the rate of pyrite oxidation, indicating that this ion has an inhibiting effect on the oxidation of pyrite by hydrogen peroxide. |
| first_indexed | 2024-12-12T12:35:23Z |
| format | Article |
| id | doaj.art-5ed55d7041e44505b482cb23a2888f21 |
| institution | Directory Open Access Journal |
| issn | 0352-5139 |
| language | English |
| last_indexed | 2024-12-12T12:35:23Z |
| publishDate | 1999-12-01 |
| publisher | Serbian Chemical Society |
| record_format | Article |
| series | Journal of the Serbian Chemical Society |
| spelling | doaj.art-5ed55d7041e44505b482cb23a2888f212022-12-22T00:24:20ZengSerbian Chemical SocietyJournal of the Serbian Chemical Society0352-51391999-12-016412753764Kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutionsVALENTINA DIMITRIJEVICMILAN ANTONIJEVICMILE DIMITRIJEVICThe kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions were investigated. The effects of stirring, temperature, and particle size, as well as of the hydrogen peroxide and phosphoric acid concentrations were studied. The effect of phosphate ion addition was also examined. The oxidation kinetics was found to follow a shrinking core model, with the surface chemical reaciton as the rate-controlling step. This is in accord with an activation energy of 57 kJ mol-1 and a linear relationship between the rate constant and the reciprocal of the particle radius. The reaction order with respect to the hydrogen peroxide concentration was found to be equal to unity. Variation of the phosphoric acid concentration had practically no effect on the rate of pyrite oxidation. Addition of the phosphate ion in the relatively low concentration range (0.005-0.1 mol dm-3) had a highly negative influence on the rate of pyrite oxidation, indicating that this ion has an inhibiting effect on the oxidation of pyrite by hydrogen peroxide.http://www.shd.org.yu/HtDocs/SHD/Vol64/No12-Pdf/V64-No12-04.zippyriteoxidationreaction kineticshydrogen peroxidephosphoric acid |
| spellingShingle | VALENTINA DIMITRIJEVIC MILAN ANTONIJEVIC MILE DIMITRIJEVIC Kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions Journal of the Serbian Chemical Society pyrite oxidation reaction kinetics hydrogen peroxide phosphoric acid |
| title | Kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions |
| title_full | Kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions |
| title_fullStr | Kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions |
| title_full_unstemmed | Kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions |
| title_short | Kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions |
| title_sort | kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions |
| topic | pyrite oxidation reaction kinetics hydrogen peroxide phosphoric acid |
| url | http://www.shd.org.yu/HtDocs/SHD/Vol64/No12-Pdf/V64-No12-04.zip |
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