TY - JOUR
T1 - Evaluation of Pressure Filtration of Coal Refuse Slurry
T2 - Effects of pH, Filtration, and Air-Blow Times
AU - Raman, G. S.S.
AU - Klima, M. S.
N1 - Funding Information:
This study was sponsored in part by the Appalachian Research Initiative for Environmental Science (ARIES). The views, opinions, and recommendations expressed herein are solely those of the authors and do not imply any endorsement by ARIES employees, other ARIES-affiliated researchers, or industrial members. Information about ARIES can be found at http://www.energy.vt.edu/ARIES .
Publisher Copyright:
© 2020 Taylor & Francis Group, LLC.
PY - 2022
Y1 - 2022
N2 - Coal refuse slurry impoundments have potential environmental concerns associated with water contamination and impoundment stability. Pressure filtration can be used as an alternative method of handling such coal waste streams as it offers an opportunity to stack the dewatered refuse solids for subsequent disposal, reducing or eliminating the need for the impoundment. A response surface methodology approach was used to evaluate the effects of pH, filtration time, and air-blow time on pressure filtration, whose response was measured in terms of final cake moisture. Cake moistures as low as 19.2% were obtained in this study. Experimental results showed a decrease in cake moisture by 13% with an increase in filtration time from 40 minutes to 50 minutes. One third reduction in cake moisture was achieved for a test with 10 minutes of air-blow after 30 minutes of filtration time compared to a test with 40 minutes of filtration time. The effect of pH was significant on both the residual moisture content and the amount of solids deposited in the cake, with acidic pH increasing the filtration performance. A linear fit was developed to relate the amount of solids deposited in the cake as a function of pH and filtration time. A regression model for the response surface with respect to the predictor variables had an R2 value of about 0.99 with almost all the main effects, their square terms, and the interaction effects statistically significant.
AB - Coal refuse slurry impoundments have potential environmental concerns associated with water contamination and impoundment stability. Pressure filtration can be used as an alternative method of handling such coal waste streams as it offers an opportunity to stack the dewatered refuse solids for subsequent disposal, reducing or eliminating the need for the impoundment. A response surface methodology approach was used to evaluate the effects of pH, filtration time, and air-blow time on pressure filtration, whose response was measured in terms of final cake moisture. Cake moistures as low as 19.2% were obtained in this study. Experimental results showed a decrease in cake moisture by 13% with an increase in filtration time from 40 minutes to 50 minutes. One third reduction in cake moisture was achieved for a test with 10 minutes of air-blow after 30 minutes of filtration time compared to a test with 40 minutes of filtration time. The effect of pH was significant on both the residual moisture content and the amount of solids deposited in the cake, with acidic pH increasing the filtration performance. A linear fit was developed to relate the amount of solids deposited in the cake as a function of pH and filtration time. A regression model for the response surface with respect to the predictor variables had an R2 value of about 0.99 with almost all the main effects, their square terms, and the interaction effects statistically significant.
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U2 - 10.1080/08827508.2020.1804384
DO - 10.1080/08827508.2020.1804384
M3 - Article
AN - SCOPUS:85089252957
SN - 0882-7508
VL - 43
SP - 13
EP - 21
JO - Mineral Processing and Extractive Metallurgy Review
JF - Mineral Processing and Extractive Metallurgy Review
IS - 1
ER -