固相反应合成磷酸硼工艺研究

Synthesis of boron phosphate by solid state reaction

采用固相反应法以硼酸和磷酸二氢铵为原料制备磷酸硼（BPO4）产品，研究了原料配比（氧化硼与五氧化二磷物质的量比）、反应温度对产物化学组成和结构的影响，确定的最佳工艺条件为：n（氧化硼）m（五氧化二磷）为1．0～1．05，反应温度为850～1000℃。用红外光谱（IR）、X射线衍射（XRD）研究了产品的物相结构。温度是影响物相结构的主要因素，当固相反应温度达到1000℃时，所得产品晶体结构完整，产品质量稳定。采用热重一差热分析（TG-DTA）和差示扫描量热法（DSC）研究了高温固相反应过程，提出了该工艺的反应机理，并确定了在技术上、经济上可行的工艺路线。

Boron phosphate （BPO4） was prepared with boric acid and monoammonium phosphate as raw materials by solid state reaction method.Influences of the amount-of-substance ratio of boric oxide to phosphorus pentoxide and reaction temperature on the product＇s composition and structure were investigated.Optimum technological conditions were determined as follows：the amount-of-substance ratio of boric oxide to phosphorus pentoxide was 1.0-1.05, and the reaction temperature was 850-1 000 ℃.The phase structure of the product was analyzed by IR and XRD.Temperature was the main factor affecting the phase structure,when the solid state reaction temperature reached 1 000 ℃ ,the product had such characteristics as complete crystal structure and stable product quality.The reaction process was studied by TG-DTA and DSC analysis and reaction mechanism was brought forward.Finally, it was confirmed that the synthesis technique was technically feasible and economically reasonable.