The use of very low molecular weight polysaccharides as depressants in PGM flotation
Polysaccharides traditionally used in PGM flotation have molecular weights (MW) varying from 150,000 to 600,000 as measured using gel permeation columns (GPC). In recent years polysaccharides at the lower end of the range (MW of 100,000–150,000) have been used effectively. This work evaluates the us...
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| Published in: | Minerals engineering Vol. 21; no. 6; pp. 471 - 482 |
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| Format: | Journal Article |
| Language: | English |
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01-05-2008
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| Abstract | Polysaccharides traditionally used in PGM flotation have molecular weights (MW) varying from 150,000 to 600,000 as measured using gel permeation columns (GPC). In recent years polysaccharides at the lower end of the range (MW of 100,000–150,000) have been used effectively. This work evaluates the use of a modified starch depressant with a much lower average MW of 20,000 as a depressant and compares its performance on two Merensky ores to that of depressants currently used in industry, namely guar gum and carboxymethylcellulose (CMC). The UCT batch flotation system was used to assess the performance of the starch as a depressant of naturally floatable gangue (NFG) as well as its effect on sulphide mineral recovery at low and high dosages. Determination of the amount of polymer adsorbed was also done by assessing polymer in solution at various concentrations using the Du Bois method. PGM assays were carried out on one ore sample. Results indicated that this starch is an effective depressant of NFG. |
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| AbstractList | Polysaccharides traditionally used in PGM flotation have molecular weights (MW) varying from 150,000 to 600,000 as measured using gel permeation columns (GPC). In recent years polysaccharides at the lower end of the range (MW of 100,000–150,000) have been used effectively. This work evaluates the use of a modified starch depressant with a much lower average MW of 20,000 as a depressant and compares its performance on two Merensky ores to that of depressants currently used in industry, namely guar gum and carboxymethylcellulose (CMC). The UCT batch flotation system was used to assess the performance of the starch as a depressant of naturally floatable gangue (NFG) as well as its effect on sulphide mineral recovery at low and high dosages. Determination of the amount of polymer adsorbed was also done by assessing polymer in solution at various concentrations using the Du Bois method. PGM assays were carried out on one ore sample. Results indicated that this starch is an effective depressant of NFG. |
| Author | Harris, P.J. Bradshaw, D.J. Wiese, J.G. |
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| CitedBy_id | crossref_primary_10_1016_j_hydromet_2016_10_027 crossref_primary_10_1016_j_mineng_2023_108024 crossref_primary_10_5454_mi_10_1_3 crossref_primary_10_1016_j_apsusc_2015_02_063 crossref_primary_10_2166_wst_2020_568 crossref_primary_10_1016_j_mineng_2010_12_015 crossref_primary_10_1016_j_mineng_2016_03_008 crossref_primary_10_17073_0021_3438_2023_5_5_14 crossref_primary_10_1016_j_mineng_2019_106015 crossref_primary_10_1016_j_colsurfa_2018_07_054 crossref_primary_10_1016_j_mineng_2012_03_026 crossref_primary_10_1016_j_minpro_2015_03_008 |
| Cites_doi | 10.1016/j.mineng.2005.01.032 10.1016/j.mineng.2007.03.008 10.1016/j.mineng.2006.04.003 10.1016/S1003-6326(06)60033-2 10.1007/BF03403190 10.1016/j.minpro.2007.07.003 10.1007/978-94-009-0417-0_1 10.1016/j.mineng.2003.08.001 10.1021/ac60111a017 10.1016/j.mineng.2004.09.013 |
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| SubjectTerms | Flotation depressants Froth flotation Precious metal ores |
| Title | The use of very low molecular weight polysaccharides as depressants in PGM flotation |
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