氟硅酸生产氟化氢铵联产白炭黑新工艺

New process for joint production of ammonium bifluoride and white carbon black from fluorosilicic acid

利用磷肥生产过程中排放的含氟气体经水吸收后获得的氟硅酸溶液为原料,在适宜的工艺条件下与氨水反应,生成氟化铵和二氧化硅。二氧化硅经洗涤、干燥得白炭黑产品;氟化铵溶液经浓缩、高温分解得氟化氢铵。所得产品氟化氢铵符合HG/T 3586—1999优等品的要求;白炭黑符合GB 10571—1989要求。新工艺生产成本低于传统工艺生产成本。新工艺具有较好的社会效益、经济效益和环保效益。

Taking the advantage of the exhausted fluorine - contained gas in the production of phosphorous fertilizer as the raw material, after it absorbed by water, the obtained fluorosilicic acid solution can react with ammonia under the appropriate conditions to produce ammonium fluoride and silica. Through washing and drying, silica can be processed into white carbon black product ; ammonium fluoride can be changed into ammonium bifluoride after concentration and high - temperature decomposition. The obtained ammonium bifluoride and white carbon black met the standards of HG/T 3586--1999 （ superior grade） and GB 10571--1989 ,respectively. The production cost of the new process is lower than that of the traditional process and it has good social, economic, and environmental benefits.