Abstract
A clean goethite process for iron removal was proposed to overcome the challenges of large amount of hazardous iron waste and low reaction rate. First, the forms of substances in zinc leaching solution and iron precipitation residue were analyzed by thermodynamic calculation. The process parameters were then optimized by industrial test, and the strengthening mechanism was revealed by numerical simulation. Finally, the industrial application of the process was evaluated. Results indicated that the stable phase of goethite existed in the pH range of 2.8–4.2 at 80 °C. The concentration of iron was reduced from 11.94 g L−1 to 2.08 g L−1 at 6 h under optimal conditions, and the iron and zinc contents in the residue with needle structure were 49.95 wt% and 6.02 wt%, respectively. The shear-enhanced process accelerated the flow rate and improved the gas dispersion, leading to the rapid homogenization of solution and increased reaction rate. In addition, the oxygen utilization rate of the shear-enhanced goethite process was 39.33% higher than that of the traditional process. The shear-enhanced process achieved a 20% reduction in waste residue, and the production cost was 0.85 $ kg−1.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
