35kt/a氟硅酸钠装置设计总结

Sum-up of Design of 35 kt/a Sodium Fluorosilicate Unit

35kt/a氟硅酸钠装置设计采用两级中和、两级沉降工艺,质量分数为8%～12%的氟硅酸与硫酸钠饱和溶液反应后送结晶槽,经脱水、干燥得产品(氟硅酸钠≥99.2%,游离酸≤0.1%,水分≤0.2%,均为质量分数)。介绍了试车过程中遇到的问题及其改进方法。

The design of a 35 kt/a sodium fluorosilicate unit employs the process of two-stage neutralization and two-stage sedimentation, in which fluoro silicic acid of 8% - 12% mass fraction is reacted with saturated sodium sulfate solution, sent to the crystallizer, dehydrated and dried, to give the product, comprising （mass fraction） of ≥99.2% sodium fluorosilicate, ≤0.1% free acid, and ≤0.2% water. An introduction is given of the problems encountered in trial run and methods of improvement.