Abstract
Over the last few years, a number of European countries have imposed limits on the amount of cadmium that may be present in fertilisers that are consumed in these countries. This paper presents details of a process developed by IMI to remove cadmium and other heavy metals from wet process phosphoric acid (WPA). The process is based on the precipitation of cadmium from WPA through simultaneous addition of iron powder and a dithiophosphinate reagent to concentrated WPA exiting from the concentration stage. The cadmium-containing precipitate can be filtered or settled. This process has been successfully demonstrated in the laboratory, in pilot operation (60 liters concentrated WPA per hour), and on a plant scale (60 tons P2O5 per day).
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