There is an urgent need to find new, improved ways to reduce CO₂ emissions and treat phosphogypsum (PG) waste. This research proposes an energy-efficient methodology for the production of pure calcium carbonate and CO₂ mineral sequestration (CMS) by hydrolysate of PG decomposition products. The technical feasibility of this process and the influence of process variables on CMS were investigated using online experiments. Pure calcium carbonate was obtained by CO₂ separation and mineralization using the hydrolysis solution of PG decomposition products. A carbonization rate greater than 90% was obtained when the liquid phase absorption reached saturation. In addition, lower temperatures and higher CO₂ partial pressures favoured CMS. To confirm the operating strategy underlying calcium carbonate crystallization, real-time experiments data obtained from process analytical technologies (PATs) and solutions of population balance equations were used to determine parameters of crystallization kinetic models. The match between model simulation experiments and online experimental results throughout the crystallization process confirms the robustness of our findings.

迫切需要找到新的，改进的方法来减少CO ₂排放并处理磷石膏（PG）废物。这项研究提出了一种高能效的方法，可以通过水解PG分解产物来生产纯碳酸钙和CO ₂矿物固存（CMS）。使用在线实验研究了该工艺的技术可行性以及工艺变量对CMS的影响。使用PG分解产物的水解溶液，通过CO ₂分离和矿化获得纯碳酸钙。当液相吸收达到饱和时，碳化率大于90％。另外，较低的温度和较高的CO ₂分压有利于CMS。为了确认碳酸钙结晶的操作策略，使用了从过程分析技术（PAT）获得的实时实验数据和总体平衡方程的解来确定结晶动力学模型的参数。在整个结晶过程中，模型仿真实验与在线实验结果之间的匹配证明了我们发现的可靠性。