水溶性磷酸一铵制备工艺研究

选取湿法磷酸为原料生产水溶性磷酸一铵,研究中和度、陈化时间、过滤温度和稀释浓度对产品品质的影响。实验表明稀磷酸适合生产64.0%的水溶性磷酸一铵,浓磷酸适合生产66.0%的水溶性磷酸一铵,控制中和度1.0左右、料浆陈化2 h以上、过滤温度80～90℃有利于过滤操作和产品水不溶物含量控制。     

KLPAAM复合高吸水树脂吸附

采用自制高岭土/木质素磺酸钠接枝丙烯酸-丙烯酰胺复合高吸水树脂(KLPAAM),测定了其在CuCl²、ZnCl²溶液中的吸附性能;通过FTIR、TG、SEM及吸附动力学方程模拟,对其吸附机理进行了探讨。KLPAAM对Cu²⁺的吸附量随Cu²⁺in situ growth of carbon nanotubes (CNTs) at both the basal planes and the edges of GO templates, engendering a minute-level and straightforward route to create 3D hierarchical nanohybrids (GO-CNT). The nanohybrids and GO [1%, 2% and 3%(mass)] were incorporated into polypropylene (PP) using common extrusion compounding amenable to scale up. Unlike the prominent local aggregation of GO in PP composites, GO-CNT was properly exfoliated and dispersed regardless of the loadings. This contributed to multiple improvements in mechanical properties and thermal conductivity for GC/PP, as exemplified by the highest yield strength (38.0 MPa) and thermal conductivity [0.76 W/(m·K)] for GC3, displaying remarkable increase of 20% and 230% compared to those of pure PLA. This work affords elucidation of direct covalent functionalization of 2D nanosheets and property-by-morphology understanding in polymer composites, which may motivate further extension to other polymer composite systems.     

萘系高效减水剂在胶磷矿浮选中的工业应用

以萘系高效减水剂作为碳酸盐、硅酸盐等脉石矿物的抑制剂,进行胶磷矿正反浮选工业试验.结果表明,在胶磷矿原矿w(P2O5)17.36％、w(MgO)4.84％的条件下,经正反浮选工艺流程可得到磷精矿w(P2O5)32.68％、w(MgO)0.76％,P2O5回收率81.14％的较好指标,且生产出的磷精矿沉降性能较好.