With the same pump conditions, the medial section temperature raise of 0.5%(mass fraction) Nd-ion doped neodymium-doped yttrium orthovanadate crystal is higher than other doped quality index.
Conclusion the liquid nitrogen rapid freeze method is the best anti-ice crystal mation method for section preservation.
结论低温骤冷法是这三种防冰晶法中最利于保存切片的方法。
3
The design, operation and problems in the reaction section in the phosphoric acid facility are introduced. The problems lie in the poor crystal of phosphogypsum and low P2O5 recovery of 83.17%.