Analysis of electrokinetic response of solid-liquid mixture during expression operation
In the expression process of slurry material using a filter-press of compression type, the process is divided into two periods: the filtration period and the consolidation period. Identification of the exact time of culmination of filtration period is essential for operating the press effectively...
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| Main Authors: | , , , |
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| Format: | Conference or Workshop Item |
| Language: | English English |
| Published: |
2022
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/102836/2/N4.1%2C%20Iwata.pdf http://irep.iium.edu.my/102836/9/WFC13%20Program%20Book.pdf http://irep.iium.edu.my/102836/ |
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| Institution: | Universiti Islam Antarabangsa Malaysia |
| Language: | English English |
| Summary: | In the expression process of slurry material using a filter-press of compression
type, the process is divided into two periods: the filtration period and the
consolidation period. Identification of the exact time of culmination of filtration
period is essential for operating the press effectively. This study focused on the
electrokinetic phenomena during expression operation of zinc oxide slurry to
obtain information on the status of the filter chamber. We have measured the
time course of electrical potential difference (EPD) between both ends of
expressed material during the expression process using a labolatory piston
press. The absolute value of EPD increased with the progress of the filtration
period, followed by the decrease during the consolidation period. It was
observed that the time at which the absolute value of the EPD began to decline
coincided with the time at which the filtration period ended. EPD reached the
plateau value at the end of consolidation. In a consolidation of homogeneous
semisolid material, the absolute value of EPD increased at the beginning of the
operation, followed by the decline to the plateau value. We have extended the theoretical equation of streaming potential for a straight capillary to be applied to a tortuous flow path of the expressed material. The time course of EPD can
be qualitatively explained by using the proposed equation for EPD and calculated liquid pressure distributions based on the conventional filtration andconsolidation theories by considering the medium resistance. |
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