【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SiO₃^2-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。更多还原

【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 ℃, 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 SiO₃^2- in the green liquor to generate insoluble calcium silicoaluminate precipitates（primarily composed of 2CaO·Al₂O₃·2SiO₂）, thereby achieving efficient silicon removal.更多还原