Precipitation Methods Using Calcium-Containing Ores for Fluoride Removal in Wastewater
Precipitation Methods Using Calcium-Containing Ores for Fluoride Removal in Wastewater
复制标题
利用含钙矿石沉淀法去除废水中的氟化物
DOI：
10.3390/min9090511
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发表时间：
2019-08
期刊：
影响因子：
2.5
通讯作者：
Tang Honghu
中科院分区：
文献类型：
--
作者：
Wang Li;Zhang Ye;Sun Ning;Sun Wei;Hu Yuehua;Tang Honghu
含氟废水对人体健康和生态环境有很大危害，需要进行有效处理。本文采用新型含钙沉淀剂方解石和助沉淀剂萤石净化含氟废水。对反应时间、振荡速率、盐酸用量、方解石用量、萤石助沉性能等相关反应条件进行了分析，并对其作用机理进行了探讨。实验结果表明，当反应时间为30 min，方解石投加量为2 g/L，稀盐酸投加量为5%，振荡速率为160 r/min时，模拟废水中氟的去除率可达96.20%。在方解石投加量为12 g/L、反应时间为30 min、振荡速率为160 r/min的最佳条件下，实际含氟冶炼废水中氟的去除率可达95%左右。实验结果表明，方解石和萤石能有效降低含氟废水中氟离子的浓度，解决反应性沉淀物沉降缓慢的问题。
F-containing wastewater does great harm to human health and the ecological environment and thus needs to be treated efficiently. In this paper, the new calcium-containing precipitant calcite and aided precipitant fluorite were adopted to purify F-containing wastewater. Relevant reaction conditions, such as reaction time, oscillation rate, dosage of hydrochloric acid, calcite dosage and the assisting sedimentation performance of fluorite, and action mechanism are analyzed. The experiment showed that the removal rate of fluoride in simulated wastewater reached 96.20%, when the reaction time, the dosage of calcite, the dosage of 5% dilute hydrochloric acid, and the oscillation rate was 30 min, 2 g/L, 21.76 g/L, and 160 r/min, respectively. Moreover, the removal rate of fluoride in the actual F-containing smelting wastewater reaches approximately 95% under the optimum condition of calcite dosage of 12 g/L, reaction time of 30 min, and oscillation rate of 160 r/min. The addition of fluorite significantly improves the sedimentation performance of the reactive precipitates. The experimental results showed that calcite and fluorite can effectively reduce the concentration of fluoride ions in F-containing wastewater and solve the problem of slow sedimentation of reactive precipitates.
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