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| Effect of Lime Particle Size on the Caustic Reaction of Green Liquid in Alkali Recovery and Its Engineering Practice |
| Received:February 19, 2024 |
| DOI：10.11980/j.issn.0254-508X.2024.08.021 |
| Key Words:alkali recovery green liquid causticization lime particle size |
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| Abstract:In this study， the effects of lime particle size on the digestion and causticization reactions of green liquid in alkali recovery processes were investigated， and industrial practice in the actual production process was explored. The results showed that lime with smaller particles could promote the digestion and causticization reactions of green liquid. As the particle size of lime decreased， the temperature ampufication during the green liquid digestion process increased from 15.0 to 19.0 ℃， the heating time decreased from 240 to 190 s， and the effective calcium oxide content of the digestion slag decreased from 17.8% to 7.2%. The active alkali content of the white liquid after causticization increased from 128.0 to 131.5 g/L， and the causticity degree increased from 76.5% to 78.8%. However， the particle size of white sludge produced after causticization with smaller lime particle size was also small， which was not conducive to the clarification of white liquid， so the lime particle size should be reasonably controlled. In actual production practice， replacing bulk lime with powdered lime simplified the lime system， the active alkali content and causticity of the white liquid were increased by 2.0 g/L and 2.5 percentage points， respectively， and the daily operating cost of the lime system was reduced by 4 980 RMB. |
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