Recovery of calcium carbonate from waste gypsum and utilization for remediation of acid mine drainage from coal mines

The recovery of calcium carbonate from waste gypsum (a waste product of the reverse osmosis (RO) desalination process) was tested using sodium carbonate. Batch recovery of calcium carbonate from waste gypsum slurries by reacting with sodium carbonate under ambient conditions was used to assess the t...

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Bibliographic Details
Published in:Water science and technology 2012-01, Vol.66 (6), p.1296-1300
Main Authors: Mulopo, J, Radebe, V
Format: Article
Language:English
Subjects:
Acid mine drainage
Batch reactors
Calcium
Calcium carbonate
Calcium Carbonate - chemistry
Calcium carbonates
Calcium Sulfate - chemistry
Carbonates
Coal
Coal mines
Coal mining
Desalination
Feasibility studies
Gypsum
Hydrogen-Ion Concentration
Industrial Waste - analysis
Mine drainage
Mines
Mining
Neutralization
Pretreatment
Process parameters
Recovery
Reverse osmosis
Slurries
Sodium
Sodium carbonate
Technical feasibility
Water desalting
Water Pollutants, Chemical - chemistry
Water pollution
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Summary:The recovery of calcium carbonate from waste gypsum (a waste product of the reverse osmosis (RO) desalination process) was tested using sodium carbonate. Batch recovery of calcium carbonate from waste gypsum slurries by reacting with sodium carbonate under ambient conditions was used to assess the technical feasibility of CaCO(3) recovery and its use for pre-treatment of acid mine drainage (AMD) from coal mines. The effect of key process parameters, such as the slurry concentration (%) and the molar ratio of sodium carbonate to gypsum were considered. It was observed that batch waste gypsum conversion significantly increased with decrease in the slurry concentration or increase in the molar ratio of sodium carbonate to gypsum. The CaCO(3) recovered from the bench-scale batch reactor demonstrated effective neutralization ability during AMD pre-treatment compared with commercial laboratory grade CaCO(3).
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2012.322