The upsurge of phosphorus (P) demands in agriculture and the diminishing high-grade reservoirs of P are a serious challenge in the fertilizer industry. Currently, researchers in the fertilizer industry are exploring the potential of medium-low-grade phosphate rock (PR) resources. This study aims to elucidate the possible activation mechanism of P from a mixture of lignite and low-grade rock-phosphate by assessing the release in various pyrolytic products and calcined solid phosphorus using a thermogravimetric analyzer coupled with a Fourier transform infrared spectrometer (TG-FTIR). The results show that a suitable calcination temperature can effectively enhance the release of P from phosphate rock, and TG-FTIR revealed the mechanism that the effect of the calcination temperature has on the release of water-soluble phosphorus from phosphate rock mixed with lignite. Our findings confirm that the thermal treatment of PR + lignite mixture at 150°C (APR150), which is higher than the high pyrolysis temperature of 450-850°C, and the P solubility increased by 50.6% compared to that of non-pyrolytic APR. It is therefore suggested that calcined lignite at 150°C can conceivably be used as an effective substitute for expensive catalysts in the activation of low-grade PR, and thus, the high cost of PR activation can be decreased.

农业对磷（P）需求的激增和高品位磷库的减少是化肥行业面临的严峻挑战。目前，肥料行业的研究人员正在探索中低品位磷矿（PR）资源的潜力。本研究旨在通过使用热重分析仪和傅里叶变换红外光谱仪 (TG-FTIR) 评估各种热解产物和煅烧固体磷中的释放来阐明褐煤和低品位磷矿混合物中 P 的可能活化机制。 ）。结果表明，合适的煅烧温度可以有效促进磷矿中磷的释放，TG-FTIR揭示了煅烧温度对混有褐煤的磷矿中水溶性磷释放的影响机制。我们的研究结果证实，PR+褐煤混合物在 150°C (APR150) 的热处理，高于 450-850°C 的高热解温度，与非热解相比，P 溶解度增加了 50.6%四月。因此建议在150°C下煅烧褐煤可以作为低品位PR活化中昂贵催化剂的有效替代品，从而可以降低PR活化的高成本。6% 与非热解 APR 相比。因此建议在150°C下煅烧褐煤可以作为低品位PR活化中昂贵催化剂的有效替代品，从而可以降低PR活化的高成本。6% 与非热解 APR 相比。因此建议在150°C下煅烧褐煤可以作为低品位PR活化中昂贵催化剂的有效替代品，从而可以降低PR活化的高成本。