Pollution & Waste Management

Chrome Recovery

• The principle is based on recovering the chrome from floats containing residual chrome by means of precipitation, separation and subsequent dissolution in acid for reuse.

• The base used to precipitate the chrome can vary.

Method for chrome recovery

The flowsheet

Flow diagram of chrome recovery by precipitation with NaOH/Na₂CO₃

Chrome Recovery Plant

Figure: The incoming effluent, after analysis is treated to produce chrome hydroxide. This is redissolved (in lower pH) and subjected to further analysis before being passed back for use in the tanning process.

Chrome Recovery : Reactions