What types of metals are typically removed via chemical precipitation?

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What types of metals are typically removed via chemical precipitation?

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Some of the more common metals or other substances removed via precipitation include: 1) Aluminum 2) Arsenic 3) Barium 4) Cadmium 5) Calcium 6) Trivalent chromium 7) Hexavelent chromium 8) Copper 9) Iron 10) Lead 11) Magnesium 12) Manganese 13) Mercury 14) Nickel 15) Selenium 16) Zinc How can hexavalent chromium be removed from aqueous waste streams? One option is to use ferrous sulfate to reduce the hexavalent chromium to a less toxic, trivalent chromium form that wills precipitate out of the solution. Trivalent chromium can then be reduced by sodium hydroxide. How can arsenic be removed from aqueous waste streams? Often times, ferric chloride is added to such a stream. The ferric chloride aids in the formation of floc to agglomerate fine arsenic particles that can then be removed by mechanical means. How can I treat a waste stream containing both hexavalent chromium and arsenic? Waste streams that contain these types of mixtures are often treated in two or more reducing tanks. Strong

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