Iron oxide pigment is a very important inorganic color pigment with good pigment quality and wide application fields.
The methods of producing red iron oxide are divided into dry method and wet method. The dry method mainly includes green vitriol (ie ferrous sulfate heptahydrate) calcination method, iron yellow calcination method, iron black calcination method, in addition to hematite calcination method. Ultrafine crushing method of natural iron oxide minerals using ore as raw material, etc.
The wet process mainly includes sulfate (ie ferrous sulfate or solution containing ferrous sulfate) method, nitrate (ie ferric nitrate, ferrous nitrate or solution containing ferric nitrate) method, mixed acid method; The neutralizing agent used in the step oxidation process is different, and can be divided into iron sheet method and ammonia method.
