method for precipitation of iron in the form of hematite from a zinc sulphate solution

摘要

"method for precipitation of iron as hematite from a zinc sulphate solution". The present invention relates to a method for removing hematite iron from a zinc sulfate solution under atmospheric conditions during the electrolytic preparation of zinc. According to said method, the ph of the iron-containing solution is adjusted to a value of at least 2, 7, and the oxygen-containing gas is fed to the solution, wherein part of the thus formed hematite is recirculated to the precipitation.