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| Synthesis of Calcium Carboaluminate and Its Mechanism of Silicon Removal from Green Liquor at High Temperature |
| Received:December 24, 2025 Revised:January 20, 2026 |
| DOI：10.11981/j.issn.1000-6842.2026.02.146 |
| Key Words:green liquid;silicon interference;calcium carboaluminate;high-temperature silicon removal;silicon removal mechanism |
| Fund Project:宜宾市竹产业重大攻关项目（YBZD202401）；2025年福建省林业科技项目（2025FKJ39）。 |
| Author Name | Affiliation | Postcode | | LI Xin* | College of Materials Engineering， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350002 | 350002 | | LAN Jinxin | College of Materials Engineering， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350002 | 350002 | | CAI Yuanyuan | College of Materials Engineering， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350002 | 350002 | | MA Xiaojuan | College of Materials Engineering， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350002 | 350002 | | CAO Shilin* | College of Materials Engineering， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350002 | 350002 |
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| Abstract: |
| In this study， calcium aluminate carbonate （CHAC）， a highly efficient desilication agent was synthesized， which was suitable for high-temperature green liquor systems. Its synthesis process and desiliconization conditions were systematically optimized. The results showed that under conditions of a synthesis time of 75 min， a synthesis temperature of 45 °C， and a molar ratio of CaO， NaAlO₂， and Na₂CO₃ of 2∶1∶1， the prepared CHAC exhibited a rich layered structure， high crystalline water content （14.1%）， and a large specific surface area （8.21 m2/g）， with silicon removal performance significantly superior to that of other desilication agents. When the molar ratio of CHAC to silicon was 1∶0.8 and the silicon removal time was 1 h， the silicon removal rate could reach 80.1%， and the settling time could be controlled within 10 min. The Ca²⁺ and Al³⁺ in CHAC form Ca—O—Al complexes that reacted with SiO₃²⁻ in the green liquor to generate insoluble calcium silicoaluminate precipitates （primarily composed of 2CaO·Al₂O₃·2SiO₂）， thereby achieving efficient silicon removal. |
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