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UBC Theses and Dissertations
Testing and evaluation of modifying reagents in potash flotation Perucca, Carlos Francisco
Abstract
Potash is the main source of Potassium which is one of the three basic plant nutrients along with nitrogen and phosphorus. Between 60 to 80% of the potash ore is processed by flotation, the other two important unit operations are hot or cold crystallization and electrostatic separation. Almost all the published literature on potash flotation refers to the insoluble minerals as "collector robbers" and increased collector usage is mentioned as the consequence of the presence of slimes in potash flotation circuits. The real effect of the presence of slimes in potash flotation is far more complex. The test program developed in the following chapters aimed to determine the most suitable modifying reagent(s) and the optimum dosage to optimize grade and recovery of KCI, and to evaluate various flocculants used in flotation desliming in order to determine the factors that affect flotation desliming efficiency. Based on the results, it can be stated that guar gum is probably the most effective insoluble slimes depressant for the ores under the conditions tested. The depressing action of the guar gum is strong even at low dosages (50 g/t). Carboxymethyl cellulose shows poor depressing ability at low dosages, with increasing depression performance at high dosages (200 g/t). Synthetic polyacrylamides can hardly be considered insoluble slimes "depressants" as a considerable amount of the insoluble slimes present in the feed report to the concentrate. Anionic flocculants increase insoluble slimes recovery when used instead of non-ionic flocculant at the same dosage. The recovery of KCI to the insolubles concentrate increases with the use of anionic flocculants as well but in a much smaller proportion. The flocculation-flotation of insoluble minerals is a flocculant dependent process, and the addition of a "insolubles collector" or a frother, or nothing at all merely affects the kinetics of the process.
Item Metadata
Title |
Testing and evaluation of modifying reagents in potash flotation
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2000
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Description |
Potash is the main source of Potassium which is one of the three basic plant
nutrients along with nitrogen and phosphorus. Between 60 to 80% of the potash ore is
processed by flotation, the other two important unit operations are hot or cold
crystallization and electrostatic separation.
Almost all the published literature on potash flotation refers to the insoluble
minerals as "collector robbers" and increased collector usage is mentioned as the
consequence of the presence of slimes in potash flotation circuits. The real effect of the
presence of slimes in potash flotation is far more complex.
The test program developed in the following chapters aimed to determine the most
suitable modifying reagent(s) and the optimum dosage to optimize grade and recovery
of KCI, and to evaluate various flocculants used in flotation desliming in order to
determine the factors that affect flotation desliming efficiency.
Based on the results, it can be stated that guar gum is probably the most effective
insoluble slimes depressant for the ores under the conditions tested. The depressing
action of the guar gum is strong even at low dosages (50 g/t). Carboxymethyl cellulose
shows poor depressing ability at low dosages, with increasing depression performance
at high dosages (200 g/t). Synthetic polyacrylamides can hardly be considered insoluble
slimes "depressants" as a considerable amount of the insoluble slimes present in the
feed report to the concentrate.
Anionic flocculants increase insoluble slimes recovery when used instead of non-ionic
flocculant at the same dosage. The recovery of KCI to the insolubles concentrate
increases with the use of anionic flocculants as well but in a much smaller proportion.
The flocculation-flotation of insoluble minerals is a flocculant dependent process, and
the addition of a "insolubles collector" or a frother, or nothing at all merely affects the
kinetics of the process.
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Extent |
4582768 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-07-29
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0081117
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2001-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.