Abstract
The beneficiation of montmorillonite fines from ores has been studied with the dispersion‐sedimentation process by using sodium phosphates as the dispersant in this work. This study was performed on a Ca‐montmorillonite ore from China through the measurements of MB (methylene blue) adsorption and X‐ray diffraction. Several parameters in the dispersing step, such as type and dosage of dispersant, solid concentration, and slurry stirring time, were tested to understand their effects on beneficiation. It was shown that the beneficiation process was very effective in upgrading montmorillonite, producing a high‐grade montmorillonite concentrate. Simultaneously, the Ca‐montmorillonite was transformed to Na‐montmorillonite. It has been found that sodium pyrophosphate was the best phosphate dispersant for achieving a good beneficiation of montmorillonite from the ore, which might be due to the fact that pyrophosphate ions adsorbed on montmorillonite surfaces lead to a smaller swelling capacity of the mineral particles than other phosphate ions.
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