PDF (1850K)
摘要
研究氟硅酸钠制备白炭黑与氟化钠新工艺,在快速加入的碳酸钠溶液与总碳酸钠质量配合比为1∶0.3,氟硅酸钠和碳酸钠的摩尔配合比为1∶3,表面活性剂浓度为0.3%,反应温度为85℃,流态化分离装置母液流速为24L/h条件下,制得产物白炭黑的吸收值(DBP)为2.98mL/g,平均粒径为208nm,为无定型絮状结构;氟化钠晶体的平均粒径170μm,为立方晶结构。两者的密度、粒径差使其能在流态化分离装置中高效分离,分离后白炭黑纯度94.38%,氟化钠纯度98.45%。
Abstract
Experimental study of the new technology of preparing silica and sodium fluoride with sodium fluorosilicate system was carried.Sodium carbonate solution was quickly added,the total volume ratio of 1∶0.3 for sodium carbonate.The molar ratio of sodium carbonate and sodium fluoride was 1∶3,the surfactants concentration of 0.3%,the reaction temperature was 85℃,and the separation means liquor flow rate of 24L/h.The results showed that the silica DBP value was 2.98mL/g,median diameter was 208nm,the structure was amorphous flocculent.The average particle size of sodium fluoride crystal was 170μm,and had cubic crystal structure.Both the density and particle size can efficient separation in the fluidization separation device,after separation,the purity of silica was 94.38%,and the sodium fluoride was 98.45%.
关键词
氟硅酸钠
/
碳酸钠
/
氟化钠
/
白炭黑
Key words
sodium fluorosilicate
/
sodium carbonate
/
sodium fluoride
/
silica
氟硅酸钠制备白炭黑与氟化钠新工艺研究[J].
化工新型材料, 2018, 46(5): 114-117 DOI:
[1] 戴元华.磷肥副产氟硅酸钠含氯废水的回收利用研究[D]:昆明:昆明理工大学,2011.
[2] 徐建国,周贞锋,应盛荣.我国氟化氢产品生产技术的现状及发展趋势[J].化工生产与技术,2010,17(6):8-14.
[3] Meynen V,Cool P,Vansant E F.Verified syntheses of mesoporous materials[J].Russian Chemical Reviews,2001,77(11):971-990.
[4] 郭伟杰.由磷肥企业副产氟硅酸制备氟化钠的研究[J].中国资源综合利用,2007,25(11):4-6.
[5] Central Glass Co Ltd.Process for producting sodium fluoride from sodium silicofluoride:GB,GB1520160[P].1978-08-02.
[6] 卢芳仪,刘晓红,饶志刚,等.由氟硅酸制氟化钠和白炭黑的工艺研究[J].硫磷设计与粉体工程,2000(6):6-9.
[7] 何凯,陈宏刚.表面改性剂在碳酸化法制备白炭黑过程中的作用[J].过程工程学报,2006(3):402-407.
[8] Khavryutchenko A V,Khavryutchenko V D.Fumed silica synthesis.Influence of hydrogen chloride on the fumed silica particle formation process[J].Macromolecular Symposia,2003,194:253-268.
[9] Estevez M,Vargas S,Castano V M,et al.Silica nano-particles produced by worms through a bio-digestion process of rice husk[J].Journal of Non-crystalline Solids,2009,355(14/15):844-850.
基金资助
江西省研究生创新专项资金项目(YC2016-S087)
