Effects of Temperature and pH on Pressure Filtration of Coal Refuse Slurry

G. S.S. Raman, Mark Stephen Klima

Research output: Contribution to journalArticle

Abstract

Coal refuse slurries stored in tailings impoundments can potentially lead to environmental concerns such as effluent seepage, property devaluation, and in extreme cases, dam failures. Pressure filtration offers an opportunity to reduce the impoundment requirements by providing significantly drier solids. A full-factorial design was used to study the effects of temperature and pH on dewatering a refuse slurry obtained from a coal preparation facility in Pennsylvania, USA. The experimental results indicated a strong effect of temperature on cake moisture as the cake moisture after about 2800 s was 22% at 43 °C and only 36% at 10 °C for tests conducted at pH 3. ANOVA results confirmed the statistical significance of pH, temperature, and their interaction effect. Also, the results showed no significant differences between the tests conducted near neutral and alkaline pH values at low and ambient temperatures. On the other hand, Tukey’s test indicated higher reductions in cake moisture at higher temperatures for lower pH values. This study affirms the need to monitor and control the pressure filtration process as throughput could significantly vary with changes in temperature and slurry conditions.

Original languageEnglish (US)
JournalMining, Metallurgy and Exploration
DOIs
StateAccepted/In press - Jan 1 2019

Fingerprint

Coal
refuse
slurry
coal
moisture
impoundment
Moisture
temperature
Temperature
dam failure
Coal preparation
dewatering
tailings
Dewatering
Tailings
Slurries
Seepage
seepage
Analysis of variance (ANOVA)
Dams

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Chemistry(all)
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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Effects of Temperature and pH on Pressure Filtration of Coal Refuse Slurry. / Raman, G. S.S.; Klima, Mark Stephen.

In: Mining, Metallurgy and Exploration, 01.01.2019.

Research output: Contribution to journalArticle

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