Process Study on Removal of Fluorine and Phosphorus from Sodium Tungstate Solution by Addition of Magnesium Chloride AITranslate
Abstract AITranslate
Tungsten can be efficiently leached from low grade scheelite by sodium phosphate-sodium hydroxide-calcium fluoride synergistic leaching,but the crude sodium tungstate leaching solution contains a certain amount of impurities of fluorine and phosphorus.Magnesium chloride was used as impurity removal agent to remove fluorine and phosphorus from the crude sodium tungstate solution in the form of precipitate.The effects of magnesium chloride dosage,temperature,pH value,initial fluorine concentration and reaction time on impurity removal were investigated.The experimental results show that increasing the amount of MgCl2,reaction temperature and reaction time is beneficial to improving the removal effect of fluorine and phosphorus,but too large or too small pH value is not conducive to the removal of impurities.When initial fluorine concentration is 1.35~2.85g/L and initial phosphorus concentration is 0.18g/L,the optimal process conditions are as follows:the molar ratio of magnesium to fluorine is nMg/nF=0.9,the temperature is 80℃,the pH value of solution is 11.8,and the reaction time is 30min.The removal rates of fluorine and phosphorus reach 98.3%and 97.2%,respectively,while the loss rate of tungsten in the precipitation slag is about 0.15%.Therefore,magnesium chloride precipitation method can effectively remove fluorine and phosphorus from sodium tungstate solution with low tungsten loss.
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Basic Information:
DOI：
Chinese Library Classification Number:TF841.1[冶金工程—有色金属冶金]
Citation Information:
Tungsten can be efficiently leached from low grade scheelite by sodium phosphate-sodium hydroxide-calcium fluoride synergistic leaching,but the crude sodium tungstate leaching solution contains a certain amount of impurities of fluorine and phosphorus.Magnesium chloride was used as impurity removal agent to remove fluorine and phosphorus from the crude sodium tungstate solution in the form of precipitate.The effects of magnesium chloride dosage,temperature,pH value,initial fluorine concentration and reaction time on impurity removal were investigated.The experimental results show that increasing the amount of MgCl2,reaction temperature and reaction time is beneficial to improving the removal effect of fluorine and phosphorus,but too large or too small pH value is not conducive to the removal of impurities.When initial fluorine concentration is 1.35~2.85g/L and initial phosphorus concentration is 0.18g/L,the optimal process conditions are as follows:the molar ratio of magnesium to fluorine is nMg/nF=0.9,the temperature is 80℃,the pH value of solution is 11.8,and the reaction time is 30min.The removal rates of fluorine and phosphorus reach 98.3%and 97.2%,respectively,while the loss rate of tungsten in the precipitation slag is about 0.15%.Therefore,magnesium chloride precipitation method can effectively remove fluorine and phosphorus from sodium tungstate solution with low tungsten loss.
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| GB/T 7714-2015 | [1] ZOU Ai-zhong, YANG Liang, ZHANG Xin-ying, et al. Process Study on Removal of Fluorine and Phosphorus from Sodium Tungstate Solution by Addition of Magnesium Chloride[J]. Rare Metals and Cemented Carbides, 2020(6): 5-8. |
| MLA | [1] ZOU Ai-zhong, et al., "Process Study on Removal of Fluorine and Phosphorus from Sodium Tungstate Solution by Addition of Magnesium Chloride." Rare Metals and Cemented Carbides, no. 6, 2020, pp. 5-8. |
| APA | [1] ZOU Ai-zhong, YANG Liang, ZHANG Xin-ying, & WAN Lin-sheng. (2020). Process Study on Removal of Fluorine and Phosphorus from Sodium Tungstate Solution by Addition of Magnesium Chloride. Rare Metals and Cemented Carbides(6), 5-8. |
| IEEE | [1] ZOU Ai-zhong, YANG Liang, ZHANG Xin-ying, and WAN Lin-sheng, "Process Study on Removal of Fluorine and Phosphorus from Sodium Tungstate Solution by Addition of Magnesium Chloride," Rare Metals and Cemented Carbides, no. 6, pp. 5-8, 2020. keywords: {sodium tungstate solution;magnesium chloride;fluorine;phosphorus;impurity removal;leaching solution of scheelite} |