The anion effect on sodium aluminosilicates formed under Bayer process digestion conditions

Vogrin, John; Santini, Talitha; Peng, Hong; Vaughan, James

doi:10.1016/j.hydromet.2019.105236

Cited by 16 publications

(5 citation statements)

References 33 publications

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“…Significant amounts of amorphous material, which manifests as broad humps from 15-30 °2θ, was observed at NaCl ≤0.08 M, although decreased in magnitude at higher synthesis temperature and NaCl concentration. Each sample contained caged CO 3 2-and Al(OH) 4 at up to 50% total cage anion occupancy, however, these anions did not manifest themselves in the XRD patterns, similar to our previous observations [22]. The crystallinity of the DSP as measured by background differences due to amorphous material (see supp.…”

Section: Powder X-ray Diffractionsupporting

confidence: 86%

“…Clincorporation into DSP was quantified by digesting the precipitated solids in nitric acid followed by titration with silver nitrate using the Volhard method [31]. CO 3 2incorporation into DSP was also analysed, as our previous study determined its ubiquitous nature as an impurity in Bayer DSP [22]. Carbonate concentration was determined by dry combustion (LECO furnace CS844, Leco Corporation, USA) equipped with an infrared gas detector for CO 2 .…”

Section: Analytical Techniquesmentioning

confidence: 99%

“…The precipitated solids contained hydroxysodalite, chloride-sodalite, hydroxy-cancrinite and Bayer-cancrinite at varying proportions, along with amorphous material. Symbols identifying these phases are included in Figure5[22,[33][34][35].…”

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confidence: 99%

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Influence of chloride on sodium aluminosilicate solubility in Bayer liquor

Vogrin

Santini

Peng

et al. 2020

Microporous and Mesoporous Materials

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Section: Powder X-ray Diffractionsupporting

confidence: 86%

Section: Analytical Techniquesmentioning

confidence: 99%

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Influence of chloride on sodium aluminosilicate solubility in Bayer liquor

Vogrin

Santini

Peng

et al. 2020

Microporous and Mesoporous Materials

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“…36,37 For SOD, there is only minimal weight loss after this stage up to 1030 °C, with the total weight loss being less than 10%. This means that SOD is stable for the testing temperature range, which is different from the SOD phase made from a kaolinite source, as reported by Vogrin et al 37 However, the other three phases show a different profile with heating. For LTA, there is a second weight loss between 150 and 350 °C.…”

Section: ■ Resultsmentioning

confidence: 99%

“…All four solid samples exhibit weight loss below 150 °C, ranging from about 7 to 17%. This represents the stage for the majority of the water trapped within the zeolite lattice (zeolitic water) to be released and evaporated. , For SOD, there is only minimal weight loss after this stage up to 1030 °C, with the total weight loss being less than 10%. This means that SOD is stable for the testing temperature range, which is different from the SOD phase made from a kaolinite source, as reported by Vogrin et al However, the other three phases show a different profile with heating.…”

Section: Resultsmentioning

confidence: 99%

Effect of Alkalinity on Zeolite LTN Formation under Bayer Process Pre-desilication Conditions

Peng

Vaughan

Vogrin

2021

Ind. Eng. Chem. Res.

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There is limited research about the formation of zeolite LTN under Bayer process pre-desilication conditions. Here, we report on the effect of alkaline (2–8 M NaOH) and aluminate concentrations (0.125–0.75 M) using 0.1 or 0.2 M soluble silicate with respect to its effect on zeolite crystallization within a pre-desilication time range of 4 h. Whether the LTA or LTN phase forms first is found to depend on both the aluminate and alkaline concentrations. With a 2 M NaOH initial concentration, only an amorphous-to-LTA-phase transformation is observed. For 4 and 6 M NaOH, decreasing the aluminate concentration increases the proportion of the LTN phase compared to that of LTA. The phase transformation between LTA and LTN was also observed. However, only LTN transformed into SOD at 8 M NaOH. Select pure phases obtained from the experiments were characterized by NMR and thermal gravimetry. Amorphous, LTA, and LTN phases transformed into a low-carnegieite phase, while SOD remained unchanged when heated to 850 °C. These findings on zeolite LTN provide information on the further development of the previously proposed Bayer sandy desilication product process.

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