含砷氰化尾矿回填利用污染控制技术试验研究

针对某黄金生产企业含砷氰化尾矿污染特征,开展了搅拌洗涤法、臭氧氧化法、酸化溶砷法、铁盐固砷法等多种无害化方法联合处理试验研究,旨在将该含砷氰化尾矿处理至满足氰渣规范回填利用污染控制要求。结果表明：该含砷氰化尾矿回填利用污染控制技术工艺为压滤调浆搅拌洗涤+臭氧氧化+酸化溶砷+铁盐固砷,最佳参数为原矿浆压滤后加水调浆,矿浆浓度40%,臭氧投加量0.66 g/L,酸化溶砷pH值3、曝气量0.1 m³/h、反应时间2 h,铁盐固砷七水合硫酸亚铁投加量20.0 g/L、反应时间1 h。研究结果为该黄金生产企业含砷氰化尾矿回填利用提供了技术支撑。     

氰化尾渣中低温破氰试验研究

为了充分降低热解后氰化尾渣作为回填骨料利用产生的环境风险,针对氰化尾渣在中低温条件下的无害化问题,利用回转炉进行了中低温热解研究。研究结果表明：在热解温度350℃、热解时间5.0 h的条件下,总氰化物和易释放氰化物的去除率最高,分别达99.21%和98.39%,易释放氰化物最低,可达0.004 mg/L;考虑到实际操作中运行成本的控制,建议热解时间控制在1.0 h左右,热解温度350℃,亦可获得较好的破氰效果;此外,除在250℃、0.5 h热解条件下,氰渣毒性浸出液中易释放氰化物浓度不达标外,其余热解条件下的氰渣毒浸指标均满足回填骨料污染控制要求。     

离子风的应用研究进展

离子风又称"电流体(EHD)",是气体放电产生的高能电子推动中性粒子运动,从而在宏观上表现为流体的一种现象.由于离子风具有低噪声、低功耗、响应速度快和无机械运动部件等优点,在过去的数十年中,离子风的研究和应用取得了很大发展.该文主要从实际应用和激励器结构改进两个方面,总结和分析近年来离子风的研究结果.离子风的实际应用主要集中在食品干燥、温度控制、推进、助燃、空气净化等诸多领域,并对各领域存在的问题提出了解决方案.离子风激励器结构的改进主要解决了离子风在以上应用领域所存在的放电副产物、离子风强度低、带电粒子的影响、占用空间大和电极腐蚀等问题.最后,对离子风的未来研究做出了展望,为离子风的研究提供了思路.     

压力容器故障检测装置研究

针对压力容器特殊的工作环境,可能引起爆炸或中毒等危害性较大事故,加强对压力容器的检测,提出了一种基于单片机的压力容器故障检测装置,怎样尽量缩短检测所用的时间,减少检验的成本费用,可以准确无误的发现生产中的缺陷危险,可以大大减少或者杜绝这些危险事故的发生,从而保证压力容器的安全运行,这是本文研究与解决的焦点问题.     

Multi-point discharge model: study on corona discharge of double-ended needle in large space

Corona discharge, as a common means to obtain non-equilibrium plasma, can generally obtain high-concentration plasma by increasing discharge points to meet production needs. However, the existing numerical simulation models used to study multi-point corona discharge are all calculations of small-scale space models, which cannot obtain the distribution characteristics of plasma in large space. Based on our previous research, this paper proposes a hybrid model for studying the distribution of multi-point discharge plasma in large-scale spaces, which divides the computational domain and computes separately with the hydrodynamic model and the ion mobility model. The simulation results are verified by a needle–ball electrode device. Firstly, the electric field distribution and plasma distribution of the needle electrodes with single tip and double tips are compared and discussed. Secondly, the plasma distribution of the needle electrode with the double tip at different voltages is investigated. Both computational and experimental results indicate that the charged particle concentration and current of the needle electrode with double tips are both twice as high as those of the needle electrode with a single tip. This model can extend the computational area of the multi-point corona discharge finite element model to the sub-meter (25 cm) or meter level, which provides an effective means to study the plasma distribution generated by multiple discharge points in large-scale space.     

Study on the interaction mechanism of double-blade corona discharge with a large discharge gap

Multi-source corona discharge is a commonly used method to generate more charged particles,but the interaction mechanism between multiple discharge sources, which largely determines the overall discharge effect, has still not been studied much. In this work, a large-space hybrid model based on a hydrodynamic model and ion-transport model is adopted to study the interaction mechanism between discharge sources. Specifically, the effects of the number of electrodes,voltage level, and electrode spac...     

Efficient direction-independent fog harvesting using a corona discharge device with a multi-electrode structure

Efficient collection of water from fog can effectively alleviate the problem of water shortages in foggy but water-scarce areas, such as deserts, islands and so on. Unlike inefficient fog meshes, corona discharge can charge water droplets and further enhance the water-collecting effect. This study proposes a novel multi-electrode collecting structure that can achieve efficient and direction-independent water collection from fog. The multi-electrode structure consists of three parts: a charging electrode, an intercepting electrode and a ground electrode. Four types of water-collecting structures are compared experimentally, and the collection rates from a traditional fog mesh, a wire-mesh electrode with fog coming from a high-voltage electrode, a wire-mesh electrode with fog coming from a ground electrode and a multi-electrode structure are 2–3 g h⁻¹, 100–120 g h⁻¹, 60–80 g h⁻¹ and 200–220 g h⁻¹, respectively. The collection rate of the multi-electrode structure is 100‒150 times that of a traditional fog mesh and 2–4 times that of a wire-mesh electrode. These results demonstrate the superiority of the multi-electrode structure in fog collection. In addition, the motion equation of charged droplets in an electric field is also derived, and the optimization strategy of electrode spacing is also discussed. This structure can be applied not only to fog collection, but also to air purification, factory waste gas treatment and other fields.