Method for direct desulfurization in alumina production
An alumina, direct technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of easy product contamination, increase of large-scale equipment, high desulfurization cost, low cost, avoid secondary pollution, and good effect.
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Embodiment 1
[0019] When dealing with high-sulfur ore with an aluminum-silicon ratio of 10.8 and a sulfur content of 1.92%, the composite additive for desulfurization is first prepared. According to the ratio of 58% of hemimorphite and 42% of lime, add it to the roller crusher and disc mill for grinding, the particle size is +100 mesh ≤ 10%, +160 mesh ≤ 20%, and the ground material is fully mixed evenly After that, it is made into a composite additive. The composite additive and high-sulfur bauxite are added into the alumina production batching process at a ratio of 2%:98%, and the raw ore slurry is made into a raw ore slurry through grid grinding, and then enters a high-pressure dissolution process. During the high-pressure dissolution process, Zn 2+ with S 2- Fully react to form ZnS precipitate, after sedimentation and filtration, ZnS precipitate is discharged together with red mud to achieve the purpose of desulfurization.
Embodiment 2
[0021] The composite additive and high-sulfur bauxite are added to the alumina production batching process at a ratio of 5%:95%, and the rest of the steps are the same as in Example 1.
Embodiment 3
[0023] When dealing with high-sulfur ore with an aluminum-silicon ratio of 10.9 and a sulfur content of 2.62%, the composite additive for desulfurization is first prepared. According to the ratio of 80% of hemimorphite and 20% of lime, add it to the roller crusher and disc mill to grind, the particle size is +100 mesh ≤ 10%, +160 mesh ≤ 20%, and the ground material is fully mixed evenly After that, it is made into a composite additive. The composite additive and high-sulfur bauxite are added into the alumina production batching process at a ratio of 9%:91%, and the raw ore slurry is made into a raw ore slurry through grid grinding, and enters a high-pressure dissolution process. During the high-pressure dissolution process, Zn 2+ with S 2- Fully react to form ZnS precipitate, after sedimentation and filtration, ZnS precipitate is discharged together with red mud to achieve the purpose of desulfurization.
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