Properties of Hard Chromium Plating in Trihydric Chromate Bath

The technological process of separating Fe(Ⅲ) from rare-earth sulphate leaching selection originated in Baotou rare-earth mine with solvent extraction method has been obtained. The rate of recovery of rare-earth is more then 99%. The content of Fe(Ⅲ) is less than 0.11g/l in the solution after being separated. The 10% loss of rareearth which is resulted from coprecipitation of rare-earth with Fe(Ⅲ) in the process of separatiag femc ion with sediment method is avoided. The composition of extracted complex determined as well.