Dealkalization and Leaching Behavior of Fe, Al, Ca, and Si of Red Mud by Waste Acid from Titanium White Production
journal contributionposted on 25.11.2021, 17:33 by Zhanghao Jiang, Xuejun Quan, Shuai Zhao, Kui Zeng, Hao Chen, Yankuo Zhou
Dealkalization is the necessary step for the multipurpose use of red mud (RM), and acid leaching is a productive method to realize the dealkalization of RM. Most researches focus on recovering metals from the highly alkaline waste by pure acid leaching or stabilization by dealkalization. In this study, according to the strong alkalinity of RM and strong acidity of the waste acid from titanium dioxide production, the waste acid was used for the dealkalization of RM. The effects of leaching temperature, reaction time, the concentration of waste acid, liquid–solid ratio (L/S), and stirring rate on the dealkalization of RM were investigated, and the main metal ions in the dealkalization solution were analyzed. The results show that the leaching ratio of sodium can reach 92.3591% when the leaching temperature is 30 °C, the reaction time is 10 min, the concentration of waste acid is 0.6238 mol/L, the L/S is 4:1, and the stirring rate is 300 rpm. The residual alkali content in the treated RM is 0.2674%, which is a reduction to less than 1%. The phase analysis results show that the sodalite and cancrinite in RM are dissolved, decomposed, and transformed after acid leaching. Therefore, RM meets the requirements of building materials after dealkalization, which provides further development as building material products.
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titanium dioxide productionresidual alkali contentmain metal ions30 ° chighly alkaline wastebuilding material productspure acid leachingwaste acidacid leachingbuilding materialsleaching temperatureleaching ratioleaching behaviorstrong alkalinitystrong aciditystirring rateresults showresearches focusred mudrecovering metalsreaction timereach 92productive methodnecessary stepmultipurpose use6238 mol300 rpm2674 %,10 min