4-Chlorophenol (4-CP) solution was treated by dual-frequency ultrasound inconjunction with Fenton reagent, and obvious improvement in the 4-CP degradation rate was observedin this advanced oxidation process. Experimen...4-Chlorophenol (4-CP) solution was treated by dual-frequency ultrasound inconjunction with Fenton reagent, and obvious improvement in the 4-CP degradation rate was observedin this advanced oxidation process. Experimental results showed that ultrasonic intensity,saturating gas and pH value affected greatly the 4-CP removal rate. Among four different saturatinggases (Ar, O_2, air and N_2), 4-CP degradation with Ar-saturated solution was the best. However, inthe view of practical wastewater treatment, using oxygen as the saturating gas would be moreeconomical. The addition of Fenton reagent followed the first-order kinetics and increased the 4-CPdegradation rate. The 4-CP removal rate increased by around 126% within 15 min treatment. Thesynergetic effect of dual-frequency ultrasound with Fenton reagent on 4-CP degradation was obviouslyobserved.展开更多
Fenton's reagent was employed to treat the wastewater containing RDX.The effects of FeSO4 concentration,H2O2 concentration,pH value,reaction time,temperature and initial COD of wastewater on residual COD of wastew...Fenton's reagent was employed to treat the wastewater containing RDX.The effects of FeSO4 concentration,H2O2 concentration,pH value,reaction time,temperature and initial COD of wastewater on residual COD of wastewater were investigated.The results show that the optimum FeSO4 concentration and pH are 700 mg/L and 2.5,respectively,and the residual COD of wastewater decreases with the rise in H2O2 concentration,but increases with the rise in temperature.After Fenton's reagent treatment,the initial COD of less than 874 mg/L wastewater can meet effluent standard.Under conditions of 100 mg/L H2O2,437 mg/L initial COD and 15 ℃ temperature,the lowest residual COD is obtained at 83.80 mg/L in 5 min.展开更多
这是一篇矿物加工工程领域的论文。以新疆某次火山岩型铍矿石为研究对象,进行矿物组成、元素组成分析,查明有用矿物的嵌布粒度及赋存状态,并进行系统的浮选实验。在磨矿过程加入活化剂氟化钠,对磨矿细度、浮选药剂制度进行了优化,当磨...这是一篇矿物加工工程领域的论文。以新疆某次火山岩型铍矿石为研究对象,进行矿物组成、元素组成分析,查明有用矿物的嵌布粒度及赋存状态,并进行系统的浮选实验。在磨矿过程加入活化剂氟化钠,对磨矿细度、浮选药剂制度进行了优化,当磨矿细度为-0.074 mm 85%、pH值调整剂碳酸钠、抑制剂硅酸钠、捕收剂油酸钠用量分别为1500、1000、2000 g/t时,可以获得粗选精矿BeO品位6.03%、回收率97.02%的粗选指标。将粗选精矿再磨至-0.045 mm 90%,通过两次精选实验,精矿BeO品位达到8.40%,精矿BeO回收率为78.09%,粗选尾矿经过一次扫选实验,尾矿BeO含量可降至0.003%。“一粗一扫三精、中矿集中返回粗选”的浮选闭路实验,获得了精矿BeO品位8.12%、回收率80.99%的浮选指标,可以实现羟硅铍石的较好富集,满足我国当今铍冶炼工艺对原料BeO含量的要求。展开更多
基金Partly supported by the National Natural Science Foundation of China (No. 20176053)Academic Foundation of Zhejiang University of Technology (No. 20040004).
文摘4-Chlorophenol (4-CP) solution was treated by dual-frequency ultrasound inconjunction with Fenton reagent, and obvious improvement in the 4-CP degradation rate was observedin this advanced oxidation process. Experimental results showed that ultrasonic intensity,saturating gas and pH value affected greatly the 4-CP removal rate. Among four different saturatinggases (Ar, O_2, air and N_2), 4-CP degradation with Ar-saturated solution was the best. However, inthe view of practical wastewater treatment, using oxygen as the saturating gas would be moreeconomical. The addition of Fenton reagent followed the first-order kinetics and increased the 4-CPdegradation rate. The 4-CP removal rate increased by around 126% within 15 min treatment. Thesynergetic effect of dual-frequency ultrasound with Fenton reagent on 4-CP degradation was obviouslyobserved.
基金Sponsored by National Nature Science Foundation of China (20476010)
文摘Fenton's reagent was employed to treat the wastewater containing RDX.The effects of FeSO4 concentration,H2O2 concentration,pH value,reaction time,temperature and initial COD of wastewater on residual COD of wastewater were investigated.The results show that the optimum FeSO4 concentration and pH are 700 mg/L and 2.5,respectively,and the residual COD of wastewater decreases with the rise in H2O2 concentration,but increases with the rise in temperature.After Fenton's reagent treatment,the initial COD of less than 874 mg/L wastewater can meet effluent standard.Under conditions of 100 mg/L H2O2,437 mg/L initial COD and 15 ℃ temperature,the lowest residual COD is obtained at 83.80 mg/L in 5 min.
文摘这是一篇矿物加工工程领域的论文。以新疆某次火山岩型铍矿石为研究对象,进行矿物组成、元素组成分析,查明有用矿物的嵌布粒度及赋存状态,并进行系统的浮选实验。在磨矿过程加入活化剂氟化钠,对磨矿细度、浮选药剂制度进行了优化,当磨矿细度为-0.074 mm 85%、pH值调整剂碳酸钠、抑制剂硅酸钠、捕收剂油酸钠用量分别为1500、1000、2000 g/t时,可以获得粗选精矿BeO品位6.03%、回收率97.02%的粗选指标。将粗选精矿再磨至-0.045 mm 90%,通过两次精选实验,精矿BeO品位达到8.40%,精矿BeO回收率为78.09%,粗选尾矿经过一次扫选实验,尾矿BeO含量可降至0.003%。“一粗一扫三精、中矿集中返回粗选”的浮选闭路实验,获得了精矿BeO品位8.12%、回收率80.99%的浮选指标,可以实现羟硅铍石的较好富集,满足我国当今铍冶炼工艺对原料BeO含量的要求。
