Method for reducing alumina-silica ratio of red mud through multistage carbonization
An aluminum-silicon ratio, red mud technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of a large amount of high-alkali red mud, increased alkali consumption, low alumina recovery rate, etc., and achieves low production energy consumption. , Low alkali content, and the effect of solving the environmental pollution caused by red mud
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Embodiment 1
[0047] (1) Firstly, mix lime with medium and low-grade bauxite at a mass ratio of 0.25:1, and place them in a sodium aluminate solution with a caustic alkali concentration of 260g / L and a molar ratio of sodium oxide to aluminum oxide of 2.5 at 260°C Stirring and reacting for 15 minutes, a calcified transformation slag with hydrated calcium aluminosilicate as the main phase was obtained, and the liquid-solid ratio of the sodium aluminate solution to the solid material was 10ml:1 g;
[0048] (2) Mix the calcified transformation slag and clean water in a closed container, and pass CO2 into the closed container 2 , CO 2 The gas partial pressure is 0.1MPa, and the reaction is stirred at 160°C for 240 minutes to obtain carbide slag containing calcium carbonate, hydrated calcium silicate, aluminum hydroxide and incompletely reacted hydrated calcium aluminosilicate, and a liquid-solid mixture of clean water and calcified transformation slag The ratio is 15ml: 1 g;
[0049] (3) Mix t...
Embodiment 2
[0052] (1) First mix lime and low-grade bauxite at a mass ratio of 0.35:1, and place them in a sodium aluminate solution with a caustic alkali concentration of 140g / L and a molar ratio of sodium oxide to aluminum oxide of 3.5 at 200°C Stirring and reacting for 60 minutes, a calcified transformation slag with hydrated calcium aluminosilicate as the main phase was obtained, and the liquid-solid ratio of the sodium aluminate solution to the solid material was 3ml: 1g;
[0053] (2) Mix the calcified transformation slag and clean water in a closed container, and pass CO2 into the closed container 2 , CO 2 The gas partial pressure is 1.6MPa, stirred and reacted at 60°C for 30 minutes, and the carbide slag containing calcium carbonate, hydrated calcium silicate, aluminum hydroxide and incompletely reacted hydrated calcium aluminosilicate is obtained, and the liquid-solid mixture of clear water and calcified transformation slag is obtained. The ratio is 3ml: 1 g;
[0054] (3) Mix th...
Embodiment 3
[0057] (1) Firstly, mix lime and medium-low-grade bauxite according to the mass ratio of 0.8:1, and put them in a sodium aluminate solution with a caustic alkali concentration of 180g / L and a molar ratio of sodium oxide to aluminum oxide of 3.0 at 100°C Stirring and reacting for 40 minutes, a calcified transformation slag with hydrated calcium aluminosilicate as the main phase was obtained, and the liquid-solid ratio of the sodium aluminate solution to the solid material was 5ml: 1g;
[0058] (2) Mix the calcified transformation slag and clean water in a closed container, and pass CO2 into the closed container 2 , CO 2 The gas partial pressure is 1.2MPa, and the reaction is stirred at 110°C for 120 minutes to obtain carbide slag containing calcium carbonate, hydrated calcium silicate, aluminum hydroxide and incompletely reacted hydrated calcium aluminosilicate, and a liquid-solid mixture of clean water and calcified transformation slag The ratio is 7ml: 1 g;
[0059] (3) Mix...
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