反应 #973833
ord-e5c2e2fc7f9642d7bf9ad98b6d372ccf
反应方程式
反应物
试剂
反应条件
后处理
- 1workup.ADDITIONThe resulting solutions were mixed
- 2其他No precipitates were formed during or on the
- 3workup.ADDITIONimmediate mixing of the two solutions
- 4workup.ADDITIONthe composition containing
- 5workup.ADDITIONdispersed colloidal gelatinous material
- 6温度a pilot flame
- 7其他provided the means
- 8其他The combustion products were directed into a stainless steel vessel
- 9其他was recovered form the water
- 10其他dried overnight at 100° C.
实验过程
A Calcium solution was made by dissolving 115.05 g of Calcium Nitrate tetra hydrate in 250 ml of ethanol. A phosphorus solution was made by adding 20 ml of 85% w/w aqueous Phosphoric acid to 50 ml of 30% w/w aqueous Hydrogen peroxide. The resulting solutions were mixed, adding the Calcium solution to the Phosphorus slowly with constant vigorous stirring. No precipitates were formed during or on the immediate mixing of the two solutions but subsequent to achieving the correct Ca/P ratio (complete mixing) turbidity did develop, the composition containing dispersed colloidal gelatinous material. This composition was feed to the inner venturi of a coaxial combustion nozzle. Air was supplied in the outer venturi and a pilot flame provided the means to ignite the atomised composition. The combustion products were directed into a stainless steel vessel containing water. After burning a powdered material was recovered form the water dried overnight at 100° C. and submitted for XRD (X-Ray Diffraction) analysis. The resulting XRD pattern is shown in FIG. 4. As indicated the burning of the ethanol/aqueous solution having a molar Calcium to Phosphorous ratio of 1.67 resulted in the formation of crystalline HAP without further high temperature processing Furthermore none of the peaks characteristic of TriCalcium Phosphate (TCP) and Calcium Oxide (CaO) are observed in the diffraction pattern demonstrating the advantage of the hydrogen peroxide.