Metal reduction method for mercury removal

Some metals with oxidation-reduction potential lower than the Hg ^2+, such as ^{Fe 2+, Cu, Fe, Zn} , Al, Mg and the like, to the corresponding metal chips charged showing packed column replaced with Hg ²⁺ ions in waste water. For example, the mercury removal reaction with Fe:

Fe+ Hg ²⁺ = Fe ²⁺ +Hg↓

The E° of the electric pair Fe ²⁺ /Fe is -0.44, and the E° of the electric pair Hg ²⁺ /Hg is 0.854, so the above reaction can be carried out. Metal reduction process may also be combined with other mercury removal methods, such as filter cloth and an aluminum powder in a joint replacement purified water in the lye mercury. Copper, for example, a domestic gold ore (amalgamation - flotation process) copper concentrate clarified water tests showed that when the filter cloth mercury clarified water 7.28 mg / l of mercury removal rate was 81.51%, the total mercury removal rate was 97.64%. However, organic mercury cannot be treated by direct metal reduction. It can be converted to inorganic mercury by an oxidant (such as chlorine) and then replaced with a metal.

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