黎昕,兰金鑫,蔡园园,马晓娟,曹石林.碳铝酸钙的合成及其高温绿液除硅机理研究[J].中国造纸学报,2026,41(2):146-155 本文二维码信息
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碳铝酸钙的合成及其高温绿液除硅机理研究
Synthesis of Calcium Carboaluminate and Its Mechanism of Silicon Removal from Green Liquor at High Temperature
投稿时间:2025-12-24  修订日期:2026-01-20
DOI:10.11981/j.issn.1000-6842.2026.02.146
中文关键词:  绿液  硅干扰  碳铝酸钙  高温除硅  除硅机理
Key Words:green liquid  silicon interference  calcium carboaluminate  high-temperature silicon removal  silicon removal mechanism
基金项目: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)。
作者单位邮编
黎昕* 福建农林大学材料工程学院,福建福州,350002 350002
兰金鑫 福建农林大学材料工程学院,福建福州,350002 350002
蔡园园 福建农林大学材料工程学院,福建福州,350002 350002
马晓娟 福建农林大学材料工程学院,福建福州,350002 350002
曹石林* 福建农林大学材料工程学院,福建福州,350002 350002
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中文摘要:
      本研究制备了一种适用于高温绿液体系的高效除硅剂碳铝酸钙(CHAC),并对其合成工艺及除硅条件进行了系统优化。结果表明,在合成时间75 min、反应温度45 ℃,CaO、NaAlO₂与Na₂CO₃物质的量比为2∶1∶1的条件下,制得CHAC具有丰富的层状结构、较高的结晶水含量(14.1%)与较大的比表面积(8.21 m²/g),除硅性能显著优于其他除硅剂。当CHAC与硅物质的量比为1∶0.8、除硅时间60 min时,除硅率可达80.1%,沉降时间可控制在10 min以内。CHAC中的Ca²⁺与Al³⁺通过形成Ca—O—Al,可与绿液中的SiO₃²⁻发生反应,生成难溶性硅铝酸钙类沉淀(主要组成为2CaO·Al₂O₃·2SiO₂),从而实现对硅的高效脱除。
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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