Sustainable process for valuable-metal recovery from circulating fluidized bed fly ash through nitric acid pressure leaching

Hou, Huiyao; Shao, Shuang; Ma, Baozhong; Li, Xiang; Shi, Shuyang; Chen, Yongqiang; Wang, Chengyan

doi:10.1016/j.jclepro.2022.132212

Cited by 16 publications

(3 citation statements)

References 53 publications

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“…The leaching agent used in this study, nitric acid, has significant oxidizing characteristics and may oxidize Fe 2+ to Fe 3+ and other metal impurities. Using nitric acid as a leaching agent has the advantage that aluminum nitrate decomposes at a temperature of around 250 °C, which is substantially lower than the decomposition temperatures of aluminum sulfate and aluminum chloride [10] 3.2 Characterization using UV DRS UV-Vis DRS characterization aims to determine the band gap energies of SiO2, Fe3O4, Fe3O4/SiO2, and Fe3O4/SiO2/Alginate. The results of the UV DRS analysis are presented in Figure 1.…”

Section: Characterization Using Xrfmentioning

confidence: 99%

Synthesis and characterization of Fe₃O₄/SiO₂/Alginate photocatalyst from tin tailings for batik cual waste degradation

Andini,

Fabiani,

Putri

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Fe3O4/SiO2/Alginate as photocatalyst for degradation of Batik Cual Waste has been synthesized. This study aimed to determine the degradation of cual batik waste using Fe3O4/SiO2/Alginate photocatalyst assisted by UV-C light. In this research, Fe3O4 was synthesized through the coprecipitation method, then coated with SiO2 and sodium alginate The source of SiO2 used comes from tin tailings sand. SiO2 content in tin tailings is 87.45%. UV DRS analysis showed that the band gap energies of SiO2, Fe3O4, Fe3O4/SiO2, Fe3O4/SiO2/Alginate were 1.76 eV, 1.61 eV, 2.04 eV and 1.59 eV, respectively. XRD analysis showed that the Fe3O4/SiO2 composite was successfully formed in the presence of typical diffraction peaks for silica quartz and magnetite on the composite diffractogram. Based on the percent degradation data, it was obtained that the optimal degradation time using the Fe3O4/SiO2/Alginate composite was 96.73% at 30 minutes.

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Section: Characterization Using Xrfmentioning

confidence: 99%

Synthesis and characterization of Fe₃O₄/SiO₂/Alginate photocatalyst from tin tailings for batik cual waste degradation

Andini,

Fabiani,

Putri

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…So more iron ions are hydrolyzed into hematite at high temperatures, which achieves selective leaching of Al; (2) the scaling problem of the autoclave caused by the formation of CaSO 4 when H 2 SO 4 is used as the medium can be avoided; (3) the decomposition temperature of Al(NO 3 ) 3 ·9H 2 O is only 250 °C, which is far below 1000–1200 °C of AlCl 3 ·6H 2 O and 1350 °C of Al 2 (SO 4 ) 3 ·18H 2 O . Hence the thermolysis of Al(NO 3 ) 3 ·9H 2 O and the regeneration of HNO 3 are bound to greatly reduce the cost of acid recovery Al from coal gangue/fly ash; and (4) our team has successfully applied HNO 3 pressure leaching technology to the treatment of laterite ore, realizing the recovery of HNO 3 and the enrichment of Fe in slag. − Eighty percent of Al in coal fly ash , and 95% of Al in coal gangue were leached out via HNO 3 pressurization technology by our team, but 6% of Fe in coal fly ash and 2% of Fe in coal gangue still inevitably entered the leach liquor. To obtain pure Al 2 O 3 by direct pyrolysis at a low cost, the removal of Fe 3+ from the leach liquor is a thorny challenge …”

Section: Introductionmentioning

confidence: 99%

Phase Diagram of the Al(NO₃)₃–Fe(NO₃)₃–H₂O(−HNO₃) System and Its Application in the Separation of Al³⁺ and Fe³⁺

Shi

Shao

et al. 2023

J. Chem. Eng. Data

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An original technology named HNO3 pressure leaching has been proposed by our team to leach Al from coal gangue and fly ash. Although the preliminary separation of Al and Fe had been achieved during leaching, a small amount of Fe impurity was still unavoidably dissolved into the leach liquor. To obtain pure Al2O3 during subsequent pyrolysis, it is imperative to synchronously remove Fe3+ during the crystallization of Al(NO3)3·9H2O. Herein, the phase equilibria of the Al(NO3)3–Fe(NO3)3–H2O(−HNO3) system at 25–40 °C and 0–8.12 mol kg–1 of HNO3 molality were investigated. The results indicated that the ternary system was a simple cosaturated type consisting of an immutable point, two univariate curves, and two crystallization regions. Notably, the solubility and crystallization region of Al(NO3)3·9H2O were barely impacted by acidity, while the opposite was true for Fe(NO3)3·9H2O. This finding was instructive for the crystallization of Fe(NO3)3·9H2O from the liquor with high Fe and low Al. Moreover, a high crystallization yield could be obtained at low temperatures. Finally, an appropriate crystallization procedure was provided. This study is expected to provide basic data and theoretical support for the crystallization and separation of mixed nitrates containing Al and Fe.

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“…For example, acidic extractants (Cyanex 302 [12], D2EHPA [13], and Cyanex 272 [14]) and chelating extractants (LIX 984N [15], LIX 63 [16], and LIX 84 [17]) have been used for this purpose. Di-2ethyl hexyl phosphoric acid (D2EHPA) as a classical extractant, has been widely used in extraction and separation of the divalent transition metals such as zinc, manganese, nickel, cobalt and copper [18][19][20]. According to the previous researches, for enhanced separation of Zn from acid solution by D2EHPA, another extractant along with D2EHPA must be used [21,22].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Thermodynamic Modeling of Zn+2 and Ni+2 Extraction from Zn Plant Residue using D2EHPA

Mohammadzadeh,

Bagheri,

Ghader

2023

IJE

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Zinc plant filter cake contains valuable metals that can be reused as a source for obtaining these metals. This study describes an experimental two stage study on the extraction of zinc and nickel from waste zinc filter cake which includes acid leaching of zinc filter cake followed by organic phase aided extraction of metals from the leaching solution. To determine the optimum leaching condition a comprehensive study of the recovery of chemical elements from spent plant residues was experimentally studied at different levels of acid concentrations at different temperatures while measuring chemical elements concentration with respect to time. Experimental results showed that 99% recovery of Ni 2+ , Zn 2+ and 89% recovery of Pb 2+ can be achieved at following optimum conditions: 2M nitric acid, T= 358.15 K after 1.5 h of acid leaching at S/L=1/10. Then, the extraction of Zn 2+ , Ni 2+ , and Pb 2+ was carried out by di-(2-ethylhexyl) phosphoric acid (D2EHPA) that was diluted with kerosene in equal phase ratio and the effect of extractant concentration and pH was studied at T = 298.15 K. Results showed that an increase in pH and extractant concentration can greatly increase zinc and nickel extraction to a maximum achievable amount of 95% and 90 % for Zn 2+ and Ni 2+ , respectively by 25 (v/v%) D2EHPA at pH = 5.5 and organic to aqueous phase ratio (O/A) = 1/1. For modeling of equilibrium concentrations in organic and aqueous phases and activity coefficients calculation, Electrolyte-UNIQUAC-NRF, UNIQUAC-NRF, NRTL and NRTL-based local composition models were used. After that, adjusted parameters were successfully used for calculation of the equilibrium constant of the unknown parameters and the extraction reaction. The obtained results of thermodynamic modeling were in well agreement with the experimental data.

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Sustainable process for valuable-metal recovery from circulating fluidized bed fly ash through nitric acid pressure leaching

Cited by 16 publications

References 53 publications

Synthesis and characterization of Fe₃O₄/SiO₂/Alginate photocatalyst from tin tailings for batik cual waste degradation

Synthesis and characterization of Fe₃O₄/SiO₂/Alginate photocatalyst from tin tailings for batik cual waste degradation

Phase Diagram of the Al(NO₃)₃–Fe(NO₃)₃–H₂O(−HNO₃) System and Its Application in the Separation of Al³⁺ and Fe³⁺

Experimental Investigation and Thermodynamic Modeling of Zn+2 and Ni+2 Extraction from Zn Plant Residue using D2EHPA

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Sustainable process for valuable-metal recovery from circulating fluidized bed fly ash through nitric acid pressure leaching

Cited by 16 publications

References 53 publications

Synthesis and characterization of Fe3O4/SiO2/Alginate photocatalyst from tin tailings for batik cual waste degradation

Synthesis and characterization of Fe3O4/SiO2/Alginate photocatalyst from tin tailings for batik cual waste degradation

Phase Diagram of the Al(NO3)3–Fe(NO3)3–H2O(−HNO3) System and Its Application in the Separation of Al3+ and Fe3+

Experimental Investigation and Thermodynamic Modeling of Zn+2 and Ni+2 Extraction from Zn Plant Residue using D2EHPA

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Synthesis and characterization of Fe₃O₄/SiO₂/Alginate photocatalyst from tin tailings for batik cual waste degradation

Synthesis and characterization of Fe₃O₄/SiO₂/Alginate photocatalyst from tin tailings for batik cual waste degradation

Phase Diagram of the Al(NO₃)₃–Fe(NO₃)₃–H₂O(−HNO₃) System and Its Application in the Separation of Al³⁺ and Fe³⁺