Automated Process For Removal Of Cyanide Chromate And Metal Mixtures

In this section, the chemistry and control principles described in the previous sections will be used for effluent pretreatment in a custom plating shop. Very complex situations were encoun-

2001

Potential [mV]

Equivalence Point

100-

-400

-600

-700

Equivalence Point

100-

-400

-600

-700

Iron Sulfate Titrant [ml]

Figure 4 Oxidation-reduction potential (ORP) of a K2Cr04 solution titrated with FeS04 reagent. Electrodes: Pt/saturated calomel.

tered here, since these shops perform a multitude of plating, cleaning, and stripping operations. A control system had to be installed to meet effluent guidelines that were site-specific.

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