流動焙焼法による鉄鋼酸洗廃液の新処理方法

抄録

Iron oxide (α-Fe₂O₃), a by-product of the steel industry, is widely used as a raw material of ferrite products in the electronics industry. This iron oxide is manufactured by oxidizing and thermal-decomposing spent hydrochloric acid pickling liquor (FeCl₂) in steelmaking.
A new process called Chemirite method was developed and it is summarized as follows:
1. Fluidized bed reactor is used for thermal decomposition of the purified waste liquor.
2. Energy-saving measures are effected at all levels of the equipment and operation of the plant.
3. While plant operations are continuous, pollution control is given full consideration. Moreover, safety is assured.
4. Hydrochloric acid is regenerated and reused with a higher recovery rate than other recovery processes. It also offers high purity.
5. Iron oxide powder, as a by-product, is best suited for the raw material of soft ferrite products.