Process optimization for integrated mineralization of carbon dioxide and metal recovery of red mud

Kashefi, Kazem; Pardakhti, Alireza; Shafie-Pour, Majid; Hemmati, Azadeh

doi:10.1016/j.jece.2019.103638

Cited by 25 publications

(15 citation statements)

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“…At the initial acid leaching stage, RM is mainly controlled by chemical reaction and then controlled by diffusion . The alkali and calcium ions exposed by sodium and calcium ions can react quickly with the acid solution .…”

Section: Resultsmentioning

confidence: 99%

“…After calcite is wholly transformed into gypsum, the calcium ion concentration remains unchanged (eq ), so the calcium ion dissolution efficiency remains unchanged. With the progress of the reaction, the sodium and aluminum gradually decrease in RM, which contains insoluble SiO 2 /Al 2 O 3 , forming an inert layer on the surface of RM, which hinders the further leaching of sodium in RM (eqs –). This phenomenon leads to the decrease of the leaching rate and the beginning of the diffusion control step .…”

Section: Resultsmentioning

confidence: 99%

“…With the progress of the reaction, the sodium and aluminum gradually decrease in RM, which contains insoluble SiO 2 /Al 2 O 3 , forming an inert layer on the surface of RM, which hinders the further leaching of sodium in RM (eqs –). This phenomenon leads to the decrease of the leaching rate and the beginning of the diffusion control step . Therefore, 10 min was selected as the optimal time of the dealkalization of RM in this experiment.…”

Section: Resultsmentioning

confidence: 99%

“…At the initial acid leaching stage, RM is mainly controlled by chemical reaction and then controlled by diffusion. 46 The alkali and calcium ions exposed by sodium and calcium ions can react quickly with the acid solution. 47 Therefore, the alkali reduction rate of RM and the concentration of calcium ions in the leaching solution change the fastest within 10 min.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon leads to the decrease of the leaching rate and the beginning of the diffusion control step. 46 Therefore, 10 min was selected as the optimal time of the dealkalization of RM in this experiment. performance of sodium, iron, aluminum, silicon, and calcium ions in RM, as shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

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Dealkalization and Leaching Behavior of Fe, Al, Ca, and Si of Red Mud by Waste Acid from Titanium White Production

et al. 2021

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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