The high-temperature requirement for liquid iron smelting via molten oxide electrolysis presents significant challenges.This study investigates the electrochemical reduction of Fe(Ⅲ)in a novel low-temperature electro...The high-temperature requirement for liquid iron smelting via molten oxide electrolysis presents significant challenges.This study investigates the electrochemical reduction of Fe(Ⅲ)in a novel low-temperature electrolyte,Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3),utilizing cyclic voltammetry and square wave voltammetry techniques.The results show that Fe(Ⅲ)reduction occurs in two steps:Fe(Ⅲ)+e^(−)→Fe(Ⅱ),Fe(Ⅱ)+2e^(−)→Fe,and that the redox process of Fe(Ⅲ)/Fe(Ⅱ)at the tungsten electrode is an irreversible reaction controlled by diffusion.The diffusion coefficients of Fe(Ⅲ)in the molten Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3)in the temperature range of 1248–1278 K are between 1.86×10^(−6)cm^(2)/s and 1.58×10^(−4)cm^(2)/s.The diffusion activation energy of Fe(Ⅲ)in the molten salt is 1825.41 kJ/mol.As confirmed by XRD analysis,potentiostatic electrolysis at−0.857 V(vs.O_(2)/O_(complex)^(2-))for 6 h produces metallic iron on the cathode.展开更多
[目的]探讨股骨近端防旋髓内钉(proximal femoral nail antirotation,PFNA)结合重建钢板治疗股骨转子下骨折不愈合的临床疗效。[方法]2006年5月~2015年5月,采用PFNA结合重建钢板治疗股骨转子下骨折不愈合患者15例。男10例,女5例;年龄45...[目的]探讨股骨近端防旋髓内钉(proximal femoral nail antirotation,PFNA)结合重建钢板治疗股骨转子下骨折不愈合的临床疗效。[方法]2006年5月~2015年5月,采用PFNA结合重建钢板治疗股骨转子下骨折不愈合患者15例。男10例,女5例;年龄45~65岁,平均(57.53±6.85)岁。初次致伤原因:交通事故伤8例,摔伤4例,重物砸伤3例。受伤至该次入院前接受手术治疗1次12例,2次3例。骨折距该次入院时间为11~23个月,平均(15.80±3.88)个月。术后定期依据X线片检查以及Harris髋关节功能评分标准评价髋关节功能。[结果]所有患者均顺利接受手术,术后切口均Ⅰ期愈合,均无严重早期并发症。15例均获得随访,随访时间13~42个月,平均(26.27±9.08)个月。X线片示所有患者均达骨性愈合,无畸形愈合,愈合时间10~31周,平均(18.60±5.97)周,无内固定松动或者移位。颈干角由术前(123.53±9.56)°增加至末次随访时(134.13±2.70)°,差异有统计学意义(P<0.05)。Harris髋关节评分由术前(39.07±14.82)分增加至末次随访时(86.07±7.82)分,差异有统计学意义(P<0.05)。治疗结果评定为优7例,良6例,可2例,优良率86.67%。[结论]采用PFNA结合重建钢板治疗股骨转子下骨折不愈合,可增加内侧骨皮质的稳定性,避免畸形愈合的发生,临床效果满意。展开更多
基金Project(52074084)supported by the National Natural Science Foundation of China。
文摘The high-temperature requirement for liquid iron smelting via molten oxide electrolysis presents significant challenges.This study investigates the electrochemical reduction of Fe(Ⅲ)in a novel low-temperature electrolyte,Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3),utilizing cyclic voltammetry and square wave voltammetry techniques.The results show that Fe(Ⅲ)reduction occurs in two steps:Fe(Ⅲ)+e^(−)→Fe(Ⅱ),Fe(Ⅱ)+2e^(−)→Fe,and that the redox process of Fe(Ⅲ)/Fe(Ⅱ)at the tungsten electrode is an irreversible reaction controlled by diffusion.The diffusion coefficients of Fe(Ⅲ)in the molten Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3)in the temperature range of 1248–1278 K are between 1.86×10^(−6)cm^(2)/s and 1.58×10^(−4)cm^(2)/s.The diffusion activation energy of Fe(Ⅲ)in the molten salt is 1825.41 kJ/mol.As confirmed by XRD analysis,potentiostatic electrolysis at−0.857 V(vs.O_(2)/O_(complex)^(2-))for 6 h produces metallic iron on the cathode.
文摘[目的]探讨股骨近端防旋髓内钉(proximal femoral nail antirotation,PFNA)结合重建钢板治疗股骨转子下骨折不愈合的临床疗效。[方法]2006年5月~2015年5月,采用PFNA结合重建钢板治疗股骨转子下骨折不愈合患者15例。男10例,女5例;年龄45~65岁,平均(57.53±6.85)岁。初次致伤原因:交通事故伤8例,摔伤4例,重物砸伤3例。受伤至该次入院前接受手术治疗1次12例,2次3例。骨折距该次入院时间为11~23个月,平均(15.80±3.88)个月。术后定期依据X线片检查以及Harris髋关节功能评分标准评价髋关节功能。[结果]所有患者均顺利接受手术,术后切口均Ⅰ期愈合,均无严重早期并发症。15例均获得随访,随访时间13~42个月,平均(26.27±9.08)个月。X线片示所有患者均达骨性愈合,无畸形愈合,愈合时间10~31周,平均(18.60±5.97)周,无内固定松动或者移位。颈干角由术前(123.53±9.56)°增加至末次随访时(134.13±2.70)°,差异有统计学意义(P<0.05)。Harris髋关节评分由术前(39.07±14.82)分增加至末次随访时(86.07±7.82)分,差异有统计学意义(P<0.05)。治疗结果评定为优7例,良6例,可2例,优良率86.67%。[结论]采用PFNA结合重建钢板治疗股骨转子下骨折不愈合,可增加内侧骨皮质的稳定性,避免畸形愈合的发生,临床效果满意。
