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铝合金半固态成形的研究进展 总被引:1,自引:1,他引:0
介绍了近年在半固态铝合金的设计开发、合金半固态坯料的制备以及半固态触变成形的数值模拟和试验方面的研究状况,以及取得的主要研究成果。提出了半固态合金设计的新思路与新方法,并在国际上首次成功试制出直径500mm的半固态浆料锭坯,浆料组织均匀细小,无缺陷,完全符合半固态成形要求,达到国际领先水平。 相似文献
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The decomposition of H2O2 at the Ti-based oxide electrode coated with IrO2, RuO2 and TiO2 (Ti/ IrO2/RuO2/TiO2) prepared by thermal decomposition, was investigated in the electrolysis system of constant potential and the non-electrolysis system respectively. Additionally, the influence of the decomposition of H2O2 caused by Ti-based oxide electrode on the oxidation of aniline was also investigated. The results showed that both higher loading of oxides and higher pH were able to accelerate the decomposition of H2O2 in the non-electrolysis system and in this case the decay of H2O2 was mainly caused by the catalytic action of the oxides coating. In the electrolysis system with Ti-based oxides electrode as anode, the decay rate of H2O2 increased with increasing anodic potential. In this case, the decay of H2O2 involved two mechanisms: catalytic decomposition and electrochemical oxidation. It was also found that the catalytic decomposition of H2O2 at the oxides electrode was useless to the oxidation of aniline while the electrochemical oxidation of H2O2 was only slightly helpful to the oxidation of aniline. This work suggested that using the appropriate anodes of less H2O2 decomposition as well as reasonable potential in the electro-Fenton process could achieve high chemical efficiency of H2O2. 相似文献
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本介绍了国内外污泥鼾的现状、阐述了农用、填埋、焚烧、海洋处置、资源化方法等鼾方式及其存在的问题,提出了处置污泥问题的一般思路。 相似文献
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考察了纤维素酶NS促进废纸脱墨的效果,研究了pH和温度对脱墨的影响,从不同的角度探讨了纤维素酶促进废纸脱墨的机理。实验结果表明,纤维素酶NS能有效提高废纸脱墨效果,纤维素酶NS促进废纸脱墨的最佳温度范围为40~60℃,pH范围为4.0~5.0;适量的纤维素酶NS可以提高纸浆的滤水性能,促进洗涤脱墨效率;纤维素酶促进废纸脱墨的根本原因可能在于对纤维的部分水解。 相似文献
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硫酸亚铁改性粉煤灰处理含磷废水 总被引:3,自引:0,他引:3
利用硫酸亚铁改性粉煤灰进行含磷废水的处理,探讨了pH值、粉煤灰投加量和吸附平衡时间对除磷效率的影响以及改性粉煤灰除磷的机理。实验结果表明,对于100mL含磷质量浓度为30.0 mg.L-1的溶液,改性粉煤灰除磷的最佳条件:pH 10,粉煤灰吸附容量1.0 mg.g-1,吸附平衡时间25 min;改性后的粉煤灰对磷的吸附符合Freundl-ich等温吸附公式。 相似文献
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以钛基氧化物涂层材料(Ti/SnO_2-Sb_2O_5-IrO_2)为阳极,碳纳米管修饰的石墨材料(GE-CNT)为阴极构建电化学系统,促进芬顿反应过程中Fe~(3+)还原,从而减少芬顿氧化法中铁盐加量和铁泥产生量。研究表明:GE-CNT具有良好的还原Fe~(3+)性能,其优化的阴极还原电位约为0.30 V(vs.Ag/AgCl),该电位下反应120 min时Fe~(3+)还原率达到85.7%。以Fe~(3+)为催化剂降解4-硝基酚的结果,证实了电化学还原Fe~(3+)促进芬顿反应的有效性。对比考察了电促铁还原型芬顿氧化法与普通芬顿氧化法降解4-硝基酚的效果,优化的条件下两者可获得近似的降解效果,但前者优化的H_2O_2与Fe~(2+)摩尔比为40∶1,而后者为20∶1。因此,相对于普通芬顿氧化法,电促铁还原型芬顿氧化法可显著减少芬顿反应初始Fe~(2+)投加量。 相似文献
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