Laboratory scale extraction and further transformation of the

Laboratory scale extraction and further transformation of the

Laboratory scale extraction and further transformation of the iron component of red mud 25 Feb 2020 1

K Evans, J Sustain Metall 2 (4) 316 (2016) H Gu et al. RSC Advances 6 46421 (2016) EDX analysis Element Weight%

Atomic% CK OK 15.82 56.10

24.73 65.83 Fe K Totals 28.07

100.00 9.44 Element CK OK Fe K

Na K Al K Ca K Totals EDX analysis Weight% Atomic%

17.56 26.57 56.12 63.75 22.75 7.40 1.39 1.10

0.84 0.57 1.34 0.61 100.00 FeC2O4.2H2O FeO

40% Higher added Fe containing product ferrate (VI) FeO42- E 2.20 V in acidic solution Powerful, selective oxidant Water decontaminant /coagulant L Delaude and P Laszlo J Org Chem 61 6360 (1996)

J-Q Jiang and B Lloyd Water Res 36 1397 (2002) Preparation from ferrous sulfate waste: N Kanari et al J Phys Conf Ser 416 012013 (2013) Preparation via oxidation of Fe(III) salt with hypochlorite in alkaline solution Electrochemical oxidation Dry oxidation

Ferrate(VI) yield efficiency material. Parameter using ferrous oxalate derived from red mud as raw Value Molar ratio of oxidant: Fe

6:1 8:1 10:1 Absorbance

0.35 0.42 0.60 [Fe(VI)] as mmol L-1

30.3 35.7 51.7 [Fe(VI)] as g L-1

1.7 2.0 2.9 Conversion rate (Fe(VI): total Fe ), %

38 44 64 (with dilution factor of 100)

The i nfluence of concentration and temperature on the reaction of iron oxide via ferrous oxalate from red mud detected by XRD. Sample T, o C and sodium peroxide.

IO/Na2O2 extracted Crystallographic phases were Phases

EXT600A 600 1 - and - NaFeO2

EXT600B 600 2 -NaFeO2

EXT650A 650 1 - and - NaFeO2

EXT650B 650 2 -NaFeO2

EXT700A 700 1 - and - NaFeO2

EXT700B 700 2 -NaFeO2 and NaFeO2

The i nfluence of concentration and temperatu re on the reaction of sodium peroxide and calcined red mud. Crystallographic phases detected by XRD . Sample T, o C

RM/Na2O 2 RM600A 600 2

-NaFeO2 and quartz RM600B 600 1

NaO2 , SiO 2 , NaFeO 2, NaAlSiO 4 RM650A 650 2

-NaFeO2 and quartz RM650B 650 1

Sodium iron silicon oxide RM700A 700 2

-NaFeO2 and quartz RM700B 700 1

Sodium aluminium silicate Phases Acknowledgements Dr Hannian Gu Dr Jose Rico Cerda

Professor JiaQian Jiang Chinese Scholarship Council Conacyt British Council Vidya Batra, Malini Balakrishnan

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