Utilization of Calcium-Loaded Low-Rank Brown Coals for Removing Heavy Metals from Waste Solutions

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Abstract
Calcium-loaded low-rank brown coal was used to extract various heavy metals (Cu, Hg, Pb, Zn) from aqueous solutions. The results showed a high efficiency of extraction — almost 99.9% of metals in the concentration range of 3,000–10,000 mg/1 were removed from the solutions. Both the batch and continuous modes of contacting were tested and for the latter, the process of penetration was also studied.

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