Iron use in our life is very wide, from pots and pans to industrial instruments have ironfigure. We all know that iron is easy to be corroded, so all kinds of devices we nowsee mostly steel, is an alloy of iron, so iron oxide not only, also because of the different colors were endowed with different functions.
There are a lot of, iron oxides like iron oxide, FeO, magnetite and so on, I will introduce today is how to let the iron oxides to change as a pigment, the protagonist isiron, after a period of reaction into iron oxide yellow after.
Sulfuric acid and iron filings reaction of ferrous sulfate, sodium hydroxide is added into the air oxidation and preparation of crystal nucleus, plus ferrous sulfate and iron filings in the nucleus in suspension, heating drum into the air oxidation, pressure filtration, rinsing, drying, crushing the prepared iron oxide yellow. The reaction conditions: 74g iron adding 1000ml 15% sulfuric acid reaction to iron disappear,creating concentration is about 200g/L of ferrous sulfate. Add enough 30% ferrous sulfate solution to the above prepared in sodium hydroxide, stirring. A total of 40%iron into ferrous hydroxide [Fe (OH) 2], in 30 ~ 35 DEG C through the air, so that theoxidation of Fe to Fe nuclei formation. To scrap treatment which accession to the 90g/L, to generate 7g/L nuclei and 40g/L of ferrous sulfate, continue heating up to 85 DEG C, at a speed of drum air oxidation of 64H 600L/h, then filtering, washing, drying,pulverizing system containing iron oxide yellow.
