The spray roasting waste acid regeneration technology utilizes the characteristic of FeCl₂ undergoing hydrolysis at high temperature with sufficient water vapor and an appropriate amount of air, directly converting FeCl₂ into HCl and Fe₂O₃ in a roasting furnace. The HCl gas generated from the reaction and evaporated from the acid is absorbed by water to obtain regenerated hydrochloric acid with a mass fraction of approximately 18%. Fe₂O₃ enters the bottom of the reaction furnace and is transported through a conveying pipeline into the iron powder silo. This method not only recovers resources but also solves the environmental protection problem of waste acid, and is a treatment technology encouraged by the state. The spray roasting method has a high reaction rate, with a hydrochloric acid regeneration rate of over 99.5%. The recovered hydrochloric acid has a mass fraction of approximately 18%, with no secondary pollution. Meanwhile, the by-products generated can be used as the main raw material for magnetic materials after processing, yielding considerable economic benefits.
Technical Features
• High acid recovery efficiency, with a chlorine recovery rate ≥99.5% (all chloride ions). The recovered regenerated acid can be directly returned to the pickling line for use.
• Hydrochloric acid (regenerated acid) with a concentration of 18–24% and high-quality ferric oxide powder with a purity of over 99.0% can be recovered from pickling waste liquid.
• No wastewater discharge during normal production, and exhaust gas emissions meet the ultra-low emission standard of dual 10mg/Nm³.
• The facility has a high degree of automation, is easy to start and stop, simple to operate, and runs stably, with an acid operation rate ≥95%.
Application Fields
Our company provides acid regeneration technology and complete equipment EPC services, as well as related technical services, technical transformation, spare parts sales, and other businesses. Its technology and equipment are mainly applied in:
1) Regeneration of waste hydrochloric acid from cold-rolled sheet and silicon steel sheet pickling in the steel industry;
2) Ternary precursor production;
3) Regeneration of waste hydrochloric acid from steel wire pickling;
4) Regeneration of waste hydrochloric acid from steel pipe pickling;
5) Regeneration of hydrochloric acid leach liquor in the chloride-process titanium dioxide industry;
6) Production of zirconia powder using the chlorination method;
7) Production of various metal oxides using chlorides (hydrochloric acid regeneration of various metal chlorides).
Facility Scale
50L/h–30000L/h.
