Liu Xinyue, Liu Xiaoming, Zhang Zengqi, Wei Chao, Zeng Qingsen, Li Yantian, Ma Shanliang
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Materials (Basel). 2023 Sep 3;16(17):6047. doi: 10.3390/ma16176047.
Yellow phosphorus slag (YPS) is a byproduct from the production of yellow phosphorus. It has potential pozzolanic activity and can be used as a supplementary cementitious material. However, the early strength of cement mortar decreases significantly with increasing YPS dosage, which restricts the utilization of YPS in cement and concrete. This study aimed to increase the pozzolanic activity of YPS ash by thermal activation. The strength method, alkali dissolution method and polymerization degree method were used to evaluate the effect of thermal activation at different temperatures on the pozzolanic activity of YPS ash. The results showed that YPS ash calcined at 800 °C helps to enhance the early strength because the fluorine in cuspidine (CaSiOF) is insoluble, reducing the retarding effect on the mortar. The higher late strength of YPS ash calcined at 100 °C was due to the low polymerization degree of [SiO]. The pozzolanic activity of YPS ash is positively correlated with the dissolution concentration of (Si + Al) and the compressive strength and negatively associated with the polymerization degree. This paper shows a possibility for the large-scale utilization of YPS.
黄磷渣（YPS）是黄磷生产过程中的副产品。它具有潜在的火山灰活性，可作为辅助胶凝材料使用。然而，随着YPS用量的增加，水泥砂浆的早期强度显著降低，这限制了YPS在水泥和混凝土中的应用。本研究旨在通过热活化提高YPS灰的火山灰活性。采用强度法、碱溶法和聚合度法评价不同温度下热活化对YPS灰火山灰活性的影响。结果表明，800℃煅烧的YPS灰有助于提高早期强度，因为氟硅酸钙（CaSiOF）中的氟不溶，减少了对砂浆的缓凝作用。100℃煅烧的YPS灰后期强度较高是由于[SiO]的聚合度较低。YPS灰的火山灰活性与（Si + Al）的溶解浓度和抗压强度呈正相关，与聚合度呈负相关。本文展示了YPS大规模利用的可能性。
