The Depressing Effect of Kaolinite on Molybdenite Flotation in Seawater
| Autor: | Leopoldo Gutierrez, Dennis Vega-Garcia, Andres Ramirez, Lorenzo Reyes-Bozo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:QE351-399.2
Inorganic chemistry 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology dispersants 010502 geochemistry & geophysics 01 natural sciences Sodium hexametaphosphate chemistry.chemical_compound molybdenite Kaolinite clays Froth flotation 021102 mining & metallurgy 0105 earth and related environmental sciences seawater lcsh:Mineralogy Chemistry Magnesium Geology Geotechnical Engineering and Engineering Geology Copper Molybdenite Seawater Clay minerals |
| Zdroj: | Minerals, Vol 10, Iss 578, p 578 (2020) Minerals Volume 10 Issue 6 |
| Popis: | Copper-molybdenum grades of important mining deposits have progressively decayed, which is associated with high levels of clay minerals which affect froth flotation. The depressing effect of clay minerals on copper sulfides was previously reported but there are no systematic studies on the effect on molybdenite flotation in seawater. The objective of this work was to study the effect of kaolinite on molybdenite flotation in seawater and to evaluate the use of sodium hexametaphosphate (SHMP) as dispersant. The results of this work show that kaolinite depresses molybdenite flotation which is more significant in seawater at pH > 9. All the experimental data validate the hypothesis that kaolinite covers molybdenite, reducing its flotation recovery. The depressing effect of kaolinite on molybdenite flotation in seawater is enhanced by the magnesium and calcium hydroxo complexes at pH > 9, which induce heterocoagulation between kaolinite and molybdenite, thus reducing recovery. The attachment of the positively charged hydroxo complexes of magnesium and calcium to the molybdenite and kaolinite surfaces is diminished by SHMP. This reagent increases the repulsive forces between molybdenite and precipitates and as a result, molybdenite becomes more hydrophobic and recovery increases. |
| Databáze: | OpenAIRE |
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