Method for producing sodium aluminate by treating Bayer-process red mud through andradite one-step alkali thermal method
A technology for Bayer process red mud and calcium iron garnet, which is applied to the field of sodium aluminate production from Bayer process red mud by one-step alkaline heat treatment of calcium iron garnet, can solve the problems of waste of raw materials, high cost, low removal efficiency and the like
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Embodiment 1
[0037] In this embodiment, diaspore Bayer process red mud is used, and the main chemical composition (mass percentage, wt%) is: alumina (Al 2 o 3 ) 21.62%, silicon dioxide (SiO 2 )16.11%, sodium oxide (Na 2 O) 7.08%, calcium oxide (CaO) 16.50%, total iron (TFe) 14.80%, and its aluminum-silicon ratio is 1.34;
[0038] Sodium ferrite is sintered from iron-containing raw materials and industrial caustic soda;
[0039] The caustic concentration in the circulating mother liquor is 240g / L, and the molecular ratio is 25;
[0040] F / A=0.6:1;
[0041] C / S=2.5:1.
[0042] according to this figure 1 The method for the production of sodium aluminate by the one-step alkali-thermal process of the present invention with andradite red mud of Bayer process as shown:
[0043] S1: After mixing red mud, sodium ferrite and active lime, mix it with circulating mother liquor according to the ratio of L / S=4:1 to prepare raw material slurry;
[0044] S2: The raw material pulp is subjected to alk...
Embodiment 2
[0056] This embodiment adopts Bayer process red mud, and its main chemical composition (mass percentage, wt%) is: alumina (Al 2 o 3 ) 23.35%, silicon dioxide (SiO 2 ) 23.23%, sodium oxide (Na 2 O) 15.61%, calcium oxide (CaO) 0.51%, total iron (TFe) 16.16%, titanium dioxide (TiO 2 )5.37%, and its aluminum-silicon ratio is 1.01;
[0057] Calcium ferrite is sintered from iron-containing raw materials and lime;
[0058] The caustic concentration in the circulating mother liquor is 240g / L, and the molecular ratio is 25;
[0059] F / A=0.5:1;
[0060] C / S=3:1.
[0061] according to this figure 1 The method for the production of sodium aluminate by the one-step alkali-thermal process of the present invention with andradite red mud of Bayer process as shown:
[0062] S1: After mixing red mud, sodium ferrite and lime, mix them with circulating mother liquor according to the ratio of L / S=5:1 to prepare raw material slurry (note: the iron contained in red mud is not included in the...
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