Study on removal of fluoride by aluminum salt from concentrated sodium tungstate
LAI Xing-ren1, ZHANG Long-hui2, ZHOU Jia-kun3, ZHANG Zhong-tang1
1. School of Metallurgy Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China; 2. Research and Development Center, Chongyi Zhangyuan Tungsten Industry Co., Ltd.,Chongyi 341300, Jiangxi, China; 3. Engineering Power Department, Baosteel Desheng Stainless Steel Co., Ltd., Fuzhou 350601, Fujian, China
Abstract：The concentrated sodium tungstate solution in the process of alkali decomposition of mixed wolframite was studied. The effects of reaction time, reaction temperature, pH, tungsten trioxide concentration and feed rate on the removal efficiency of fluoride by aluminum sulfate were investigated, indicating that the concentration of fluorine in the solution can be reduced to less than 100 mg/L under the optimum conditions of pH is 12.7, temperature is 25 ℃, x(Al)∶x(F) is 2.1, reaction time is 10 min and the concentration of tungsten trioxide is 215 g/L. Further study shows that the higher the concentration of tungsten trioxide in concentrated sodium tungstate, the worse the effect of aluminum sulfate on fluoride removal, and the content of tungsten in slag increases.
赖星任, 张龙辉, 周加坤, 张忠堂. 钨酸钠浓料铝盐除氟工艺探讨[J]. 中国冶金, 2021, 31(4): 118-121.
LAI Xing-ren, ZHANG Long-hui, ZHOU Jia-kun, ZHANG Zhong-tang. Study on removal of fluoride by aluminum salt from concentrated sodium tungstate[J]. China Metallurgy, 2021, 31(4): 118-121.
2021, Vol. 31 
