Process for recovering aluminium, iron and scandium from Bayer-process red mud powder
A Bayer red mud and aluminum recycling technology, applied in the direction of improving process efficiency, can solve the problems of polluting soil, air and groundwater, seriously endangering the natural environment, and affecting people's health, so as to achieve recycling, less wastewater discharge, and solution Handle simple effects
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[0027] Example one
[0028] This embodiment provides a process for recovering aluminum, iron, and scandium from Bayer process red mud powder, such as figure 1 As shown, the specific steps are:
[0029] 1) Analyze the composition of the Bayer process red mud powder, and measure the content of aluminum oxide, iron oxide, and silicon dioxide in the Bayer process red mud powder;
[0030] 2) Mix the Bayer process red mud powder with sodium carbonate, lime and carbon powder, put the mixture mixture in a ceramic crucible, and cover with a layer of 3-5mm thick reduced carbon powder (the main function is to isolate and prevent reactants It is oxidized again in contact with air), covered with a lid and airtight, the mixing ratio of red mud powder, sodium carbonate, lime and reducing carbon powder meets: sodium carbonate compounding amount (molar ratio) [Na 2 CO 3 ] / [Al 2 O 3 ]=1~1.1, the amount of lime added (molar ratio) [CaO] / [SiO 2 ]=1.8~2, the amount of carbon powder (mass ratio) m(red mu...
Example Embodiment
[0042] Example two
[0043] This embodiment provides a process for recovering aluminum, iron, and scandium from Bayer process red mud powder, such as figure 1 As shown, the specific steps are:
[0044] 1) Analyze the composition of the Bayer process red mud powder, and measure the content of aluminum oxide, iron oxide, and silicon dioxide in the Bayer process red mud powder;
[0045] 2) Mix the Bayer process red mud powder with sodium carbonate, lime and carbon powder, put the mixture mixture in a ceramic crucible, and cover with a layer of 3-5mm thick reduced carbon powder (the main function is to isolate and prevent reactants It is oxidized again in contact with air), covered with a lid and airtight, the mixing ratio of red mud powder, sodium carbonate, lime and reducing carbon powder meets: sodium carbonate compounding amount (molar ratio) [Na 2 CO 3 ] / [Al 2 O 3 ]=1~1.1, the amount of lime added (molar ratio) [CaO] / [SiO 2 ]=1.8~2, the amount of carbon powder (mass ratio) m(red mu...
Example Embodiment
[0050] Example three
[0051] This embodiment provides a process for recovering aluminum, iron, and scandium from Bayer process red mud powder, such as figure 1 As shown, the specific steps are:
[0052] 1) Analyze the composition of the Bayer process red mud powder, and measure the content of aluminum oxide, iron oxide, and silicon dioxide in the Bayer process red mud powder;
[0053] 2) Mix the Bayer process red mud powder with sodium carbonate, lime and carbon powder, put the mixture mixture in a ceramic crucible, and cover with a layer of 3-5mm thick reduced carbon powder (the main function is to isolate and prevent reactants It is oxidized again in contact with air), covered with a lid and airtight, the mixing ratio of red mud powder, sodium carbonate, lime and reducing carbon powder meets: sodium carbonate compounding amount (molar ratio) [Na 2 CO 3 ] / [Al 2 O 3 ]=1~1.1, the amount of lime added (molar ratio) [CaO] / [SiO 2 ]=1.8~2, the amount of carbon powder (mass ratio) m(red ...
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