Process for removing heavy metal ions from solutions using adsorbents containing activated hydrotalcite
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United States of America Patent
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Jun 21, 1988
Grant Date -
N/A
app pub date -
Jun 30, 1986
filing date -
Jun 30, 1986
priority date (Note) -
Expired
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Abstract
An improved process is disclosed for the purification of an impure aqueous solution containing heavy metal ions which comprises passing the impure solution through a bed of activated adsorbent containing at least 20 wt. % activated hydrotalcite formed by reacting activated magnesia with an aqueous solution containing ions of aluminate, carbonate, and hydroxyl. The heavy metal ions are removed from the impure aqueous solution by adsorption onto the activated hydrotalcite-containing adsorbent. The adsorbent may be regenerated for reuse and the adsorbed metals recovered by subsequently stripping the metal ions from the adsorbent and recycling the metal ions back to the process of origin. The pH of the effluent may be monitored to determine when the capacity of the adsorbent has been reached and regeneration of the adsorbent should be commenced.
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