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首页> 外文会议>International Waste Management and Landfill Symposium >RECYCLING OF BLAST FURNACE SLUDGE BY COMPLEX ULTRASONIC-ASSISTED LEACHING WITH NANOSCALE ZERO-VALENT IRON AS FENTON REAGENT
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RECYCLING OF BLAST FURNACE SLUDGE BY COMPLEX ULTRASONIC-ASSISTED LEACHING WITH NANOSCALE ZERO-VALENT IRON AS FENTON REAGENT

机译：用纳米尺度零价铁作为Fenton试剂，通过复合炉污泥回收高炉污泥污泥

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Ultrasonically enhanced physicochemical processes, such as leaching of valuable metals from solid wastes or advanced oxidation processes (AOPs) for degradation of organic contaminants from wastewater have presented a promising potential for various applications in industrial and environmental chemistry. Nevertheless, some ecological issues, namely recycling of hazardous metallurgical sludges may require more complex approach and are still urgent today. A possible solution to create an effective technology for sludge recycling is use of a combination of various ultrasonic-assisted processes with positive synergetic effect. In this study, in order to enhance the leaching of zinc from blast furnace sludge (BFS), a combination of ultrasonic-assisted sulfuric acid leaching and Fenton-like process with nanoscale zero-valent iron (nZVI) was investigated in BFS/Milli-Q water mixture with continuous ratio L/S=10. In the experiments, we examined effects of various operating parameters – concentration of hydrogen peroxide, concentration of sulfuric acid, temperature, input energy of ultrasound irradiation, presence of nZVI addition (as a Fenton reagent) – on the leaching of iron (Fe) and zinc (Zn). The results showed that with 1 g/l addition of nZVI and 0.05 M of hydrogen peroxide, kinetic rate of Zn leaching increased with maximum dissolution degree of 80.2 % after 5 min treatment. Without nZVI addition, the maximum dissolution degree of Zn was 99.2 %, observed after 15 min treatment with 0.1 M of hydrogen peroxide. Thus, additions of nZVI have demonstrated an acceleration of Zn leaching at several concentrations of hydrogen peroxide, however, with some reduction in efficiency. In all experiments, observed loss of Fe was no more than 3%.
机译：超声增强的物理化学方法，例如来自固体废物或高级氧化过程（AOP）的浸出来自废水的有机污染物的降解的有机污染物（AOP）已经为工业和环境化学的各种应用提出了有希望的潜力。然而，一些生态问题，即危险冶金污泥的回收可能需要更复杂的方法，并且今天仍然紧急。为污泥回收创造有效技术的可能解决方案是使用各种超声波辅助工艺的组合，其具有积极的协同作用。在这项研究中，为了增强锌的锌从高炉污泥（BFS），在BFS / MIRLI中研究了用纳米级零价铁（NZVI）的超声波辅助硫酸浸出和FENTON样方法的组合Q与连续比L / S = 10的水混合物。在实验中，我们检查了各种操作参数的效果 - 过氧化氢浓度，硫酸浓度，超声辐射的输入能量，NZVI的存在（作为Fenton试剂） - 对铁（Fe）的浸出锌（Zn）。结果表明，加入NZVI和0.05米的过氧化氢，Zn浸出的动力学率随着5分钟处理后的最大溶解度为80.2％。在没有NZVI的情况下，Zn的最大溶解度为99.2％，在15分钟处理后观察到0.1μm过氧化氢处理。因此，NZVI的添加已经证明了以几种浓度的过氧化氢浸出的Zn浸出的加速度，效率的一些降低。在所有实验中，观察到的Fe损失不超过3％。

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