In this work, we propose a novel, effective, energy efficient technology to reduce CO₂ emissions and fully use the calcium in the solid waste by-product phosphogypsum (PG), by capturing CO₂ from the PG decomposition product’s hydrolysis solution. Experiments were conducted to investigate the technical feasibility and the influence of temperature and CO₂ partial pressure on CO₂ capture, as well as CO₂ loading on CO₂ sorption capacity. The results showed that > 90 % of the total calcium ions in the solution were converted into calcium carbonate (CaCO₃). Furthermore, a decrease in temperature and an increase in CO₂ partial pressure improved CO₂ uptake, with the latter having a greater effect on CO₂ capture capacity than the former. Moreover, kinetic analysis demonstrated that a higher temperature and CO₂ partial pressure increased the absorption rate; and showed that the CO₂ absorption rate is highly affected by the CO₂ loading levels. The thermodynamic analysis indicated that CO₂ absorption heat significantly declined as a function of increasing CO₂ loading. CaO from the calcination of carbonate was added to the hydrolysis solution and significantly enhanced its CO₂ capture ability. Thus, the hydrolyate of PG decomposition products in combination with CaO reinforcement may be a promising method for CO₂ capture.

在这项工作中，我们提出了一种新颖，有效，节能的技术，通过从PG分解产物的水解溶液中捕获CO ₂来减少CO ₂排放并充分利用固体废物副产物磷石膏（PG）中的钙。进行实验以研究技术可行性以及温度和CO ₂分压对CO ₂捕集以及CO ₂负载对CO ₂吸附能力的影响。结果表明，溶液中> 90％的总钙离子转化为碳酸钙（CaCO ₃）。此外，温度降低，CO ₂升高分压改善了CO _2的吸收，而后者对CO ₂捕集能力的影响比前者大。而且，动力学分析表明较高的温度和CO ₂分压提高了吸收速率。并且表明，CO ₂吸收速率受CO ₂负载量的影响很大。热力学分析表明，CO ₂吸收热随CO ₂负荷增加而显着下降。将碳酸盐煅烧产生的CaO添加到水解溶液中，并显着提高其CO ₂捕获能力。因此，与CaO增强相结合的PG分解产物的水解产物可能是一种有前途的CO ₂捕集方法。