Study on a New Process for Removing Fluoride from Sodium Tungstate Solution by Precipitation with Lanthanum Chloride AITranslate
Abstract AITranslate
The sodium tungstate solution obtained from low-grade scheelite by collaborative leaching with sodium phosphate-sodium hydroxide-calcium fluoride contains a relatively high concentration of fluorine,leading to the fluorine content in the smelting wastewater exceeding the national discharge standard.Based on the low solubility of lanthanum fluoride,lanthanum chloride was added to the sodium tungstate solution and the reaction produced lanthanum fluoride precipitate to thoroughly remove fluorine.The effects of process parameters including the lanthanum chloride dosage,pH value of the solution,reaction temperature,and reaction time on the removal of fluoride were investigated.The results show that the fluorine removal rate reaches 98.8%when fluorine concentration of the sodium tungstate solution is 0.5~2.1 g/L,the dosage of lanthanum chloride is 1.6 times the theoretical amount,the pH value of the solution is 1o.1,the temperature is 60 C,and the reaction time is 30 min,with a tungsten loss of 0.26%in the precipitated slag.After the removal of fluorine,the sodium tungstate solution treated by an ion exchange process can meet the requirement of the national standard for the fluorine content in the discharging wastewater.
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DOI：
Chinese Library Classification Number:TF841[冶金工程—有色金属冶金]
Citation Information:
The sodium tungstate solution obtained from low-grade scheelite by collaborative leaching with sodium phosphate-sodium hydroxide-calcium fluoride contains a relatively high concentration of fluorine,leading to the fluorine content in the smelting wastewater exceeding the national discharge standard.Based on the low solubility of lanthanum fluoride,lanthanum chloride was added to the sodium tungstate solution and the reaction produced lanthanum fluoride precipitate to thoroughly remove fluorine.The effects of process parameters including the lanthanum chloride dosage,pH value of the solution,reaction temperature,and reaction time on the removal of fluoride were investigated.The results show that the fluorine removal rate reaches 98.8%when fluorine concentration of the sodium tungstate solution is 0.5~2.1 g/L,the dosage of lanthanum chloride is 1.6 times the theoretical amount,the pH value of the solution is 1o.1,the temperature is 60 C,and the reaction time is 30 min,with a tungsten loss of 0.26%in the precipitated slag.After the removal of fluorine,the sodium tungstate solution treated by an ion exchange process can meet the requirement of the national standard for the fluorine content in the discharging wastewater.
quote
| GB/T 7714-2015 | [1] LI Chao-yang, YANG Liang, ZHANG Xin-ying, et al. Study on a New Process for Removing Fluoride from Sodium Tungstate Solution by Precipitation with Lanthanum Chloride[J]. Rare Metals and Cemented Carbides, 2023(2): 8-12. |
| MLA | [1] LI Chao-yang, et al., "Study on a New Process for Removing Fluoride from Sodium Tungstate Solution by Precipitation with Lanthanum Chloride." Rare Metals and Cemented Carbides, no. 2, 2023, pp. 8-12. |
| APA | [1] LI Chao-yang, YANG Liang, ZHANG Xin-ying, GONG Dan-dan, & WAN Lin-sheng. (2023). Study on a New Process for Removing Fluoride from Sodium Tungstate Solution by Precipitation with Lanthanum Chloride. Rare Metals and Cemented Carbides(2), 8-12. |
| IEEE | [1] LI Chao-yang, YANG Liang, ZHANG Xin-ying, GONG Dan-dan, and WAN Lin-sheng, "Study on a New Process for Removing Fluoride from Sodium Tungstate Solution by Precipitation with Lanthanum Chloride," Rare Metals and Cemented Carbides, no. 2, pp. 8-12, 2023. keywords: {lanthanum chloride;sodium tungstate;lanthanum fluoride;fluorine removal by precipitation} |