Treatment of chromium liquors

Liquors containing dissolved chromium are used in a number of sectors of the process industries in applications such as plating and coating, metal finishing and as oxidising and reducing agents. The most common form is hexavalent chromium and the concentration limit in public water supplies is of the order of 50 ppb. 

The use of Cr(VI) often results in liquors containing Cr(III) which ideally should be recycled or otherwise suitably disposed of. Electrodeposition of chromium is not an efficient means of recovery and recycling 

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