共查询到20条相似文献,搜索用时 78 毫秒
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张肖洒王宏源李振彪夏志美 《储能科学与技术》2022,(7):2066-2074
针对目前急需解决的废旧磷酸铁锂(LiFePO_(4))电池中有价金属的清洁高效提取问题,提出硫酸化焙烧脱氟-水浸新工艺。用TG-DSC和XRD表征确定了正负极片热处理的适宜条件为:空气气氛、温度575℃。采用正交实验和单因素实验研究了浓硫酸使用量、焙烧时间和温度。水浸液固比、温度及时间对正负极混合料粉末中Fe、P和Li元素浸出率和浸出液中F元素残存率的影响。确定了最优焙烧工艺条件为:浓硫酸使用量为理论用量的0.75倍、焙烧时间2.5 h、温度110℃;最优水浸工艺条件为:液固比4∶1(mL/g)、温度60℃、时间2 h。在此工艺条件下,P和Li的浸出率都达到100%,Fe元素的浸出率为98.85%,F元素在浸出液中的残存率仅为13.11%。 相似文献
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以硫酸渣和煤粉为主要原料,对硫酸渣含碳球团进行焙烧,考察焙烧时间、焙烧温度、配碳量对球团金属化率的影响,确定了最佳工艺参数,即焙烧温度为1 225℃、焙烧时间15 min、(C)/(O)为1.2时,球团金属化率可达92.5%,此工艺参数满足转底炉高效还原的特点,适用于转底炉工艺。 相似文献
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不同的PNa、PCaNa、PCa膨润土以相同的加入量,对比型砂的湿压强度、透气性、水分等型砂性能,以及分别以不同的加入量来观察各种型砂性能的变化趋势。 相似文献
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简要介绍了硫酸行业余热锅炉的腐蚀情况和防腐措施,并阐述此类余热锅炉设计压力选定原则、使用时应注意事项和除尘的重要性。 相似文献
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采用标准的k-ε湍流模型、多重参考系稳态流动方法,对锌浸出槽内流动过程进行了数值模拟研究,并且采用示踪剂法,研究了流体在槽内停留时间的分布。模拟结果表明:浸出槽无阻尼板时槽内流体主要以周向流动为主,桨叶承受的压力较大,流体在槽内有局部"短路"现象出现。增加阻尼板后,流体在槽内由原来的周向流动为主转变为轴向流动为主,加速了槽内矿浆的混合,桨叶承受的压力明显降低,其最大压力降低15%,平均压力降低57%,流体在槽内停留时间分布与无阻尼板基本相同,但平均停留时间略有增大,有利于浸出过程的进行。 相似文献
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模拟气氛下硫酸露点的腐蚀试验研究 总被引:1,自引:1,他引:1
针对我国电站锅炉排烟温度普遍偏高、低温腐蚀严重的问题,选取目前应用较为广泛的抗硫酸露点腐蚀较好的Corten钢、ND钢、316L钢和GR2钢为研究对象,以20号钢和20G钢作为对比材料,分别在壁温为43℃、55℃、65℃、75℃以及85℃下对上述6种钢材进行了72h低温腐蚀试验,并通过电镜和能谱仪对试验结果进行了分析.结果表明:6种钢材的抗腐蚀能力的排序依次为GR2钢〉ND钢〉316L钢〉Corten钢〉20G钢〉20号钢;ND钢是制造烟气深冷装置的理想材料;在壁温为65℃左右时,ND钢受到的低温腐蚀较轻. 相似文献
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基于湿法烟气脱硫试验装置,对含不同质量分数飞灰的4种石膏浆液的浸出特性、吸收速率、pH值、传质阻力和SO32-氧化等关键参数进行了研究。试验表明:浆液pH值变化分为pH值快速下降和平稳下降2个阶段;Mn2+浸出量为Fe3+的9倍,Mn2+与HSO3-形成络合物诱发催化反应加速SO2吸收;初期pH值较高,飞灰对SO2吸收速率的影响小于1.5%,pH=5时,飞灰浸出液中可溶性Mn2+增多,Mn2+催化效果更加明显,SO2吸收速率最多增加6%;浆液吸收过程由液相阻力控制,气相阻力在总阻力的比重小于38%;Mn2+的质量浓度越大,对SO32-的催化氧化作用越强。 相似文献
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K. A. Shah J. K. Parikh 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2016,38(10):1470-1477
Transesterification of refined cottonseed oil was studied in the presence of silica sulfuric acid as a new heterogeneous solid acid catalyst to overcome the drawbacks of homogeneous alkali and acid catalysts. The effect of various reaction parameters, such as oil to methanol ratio, reaction temperature, reaction time, and catalyst amount, was investigated. The highest methyl ester conversion was obtained at 373 K using 5% catalyst amount and 1:20 methanol ratio within 8 h. Silica sulfuric acid was found to be a promising catalyst for cleaner biodiesel production without tedious post treatments for the product purification. 相似文献
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生物质成型炭是生物质利用的重要方式之一,制备时需要添加黏结剂增强其品质.污泥可作为黏结剂用于制备生物质成型燃料.H3PO4作为添加剂可提高成型炭的品质且具有钝化污泥中重金属的作用.本研究以杉木屑为原料,探讨添加H3PO4和污泥制备高机械强度成型炭的可能性,分析了添加污泥和H3PO4对成型炭机械性能和产率的影响,并考察了成型炭中重金属的固定效果.结果表明:污泥的添加可提高成型炭的机械性能(抗压强度和表观密度),且木屑与污泥的质量比为2∶1时成型炭机械性能最佳且产率最高,其抗压强度为18.1 MPa,表观密度为1 278.8 kg/m3,均优于生物质成型炭机械性能标准,干基低位热值为12.05 MJ/kg;添加磷酸可明显提高成型炭机械性能和产率,且重金属分析表明磷酸的加入可降低成型炭中的重金属风险等级. 相似文献
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Iron oxide and copper chromite are the known burn rate enhancers used in a composite solid propellant. Lot of research has been carried out to understand the mechanism or location of action of the burn rate modifiers so as to better tailor the burning rate of a composite propellant. The literature is still very confusing in affirming the mechanism. Here, a systematic study has been carried out, by undertaking experiments at varying levels of combinations of the individual components (ammonium perchlorate, which is oxidizer and hydroxyl terminated poly butadiene, which is both fuel and binder) of composite solid propellant. Firstly, thermal gravimetric analysis, differential scanning calorimetry and burning rate measurements on the individual components are carried out to study the effect of iron oxide and copper chromite on the components themselves. It has been noticed that though both iron oxide and copper chromite are effective on ammonium perchlorate, iron oxide is slightly more effective than copper chromite. Also, copper chromite enhanced the binder melt flow, while iron oxide reduced it. These are followed-up by experiments on sandwich propellants, which give greater insight and enables better understanding of the behavior of iron oxide and copper chromite in composite propellants, as these are simple two-dimensional analogue of the composite solid propellants. Finally, experiments are carried out on the composite solid propellants to obtain a holistic understanding of the behavior/location of action of iron oxide and copper chromite in them. These studies are used to explain certain unexplained but observed phenomena, at the same time elucidating the location of action of these burn rate modifiers in composite solid propellant combustion. Based on these observations, it has been proposed that both iron oxide and copper chromite are primarily acting on the condensed phase. These studies are further complimented with experiments to analyze the thermal conductivity measurements of various propellant samples. This is pursued to understand the reason for the differences in burn rate pressure index for the composite propellants with iron oxide and with copper chromite. It has been understood from these studies that the thermal conductivity of a composite propellant is a key parameter, which affects the burn rate pressure index. Literature has never addressed it from this perspective. 相似文献
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为了研究掺氢对生物燃气燃烧特性的内在影响规律,本文开展了生物燃气掺氢层流燃烧的实验和CHEMKIN仿真研究。实验结果表明,当量比一定时,火焰燃烧速度随着掺氢比的增大而增大;大当量比情况下,随着掺氢比的增大,燃烧速度的增大尤为明显。仿真结果表明,掺氢后H和OH的摩尔分数变化较大。利用反应产物生成速率(ROP)分析法对掺氢燃烧过程的化学反应路径进行分析发现,由于H2浓度对基元反应O + H2 = H + OH及OH + H2 = H + H2O的影响显著,导致后续关键基元反应中H和OH的生成和消耗情况发生变化,特别是掺氢浓度较大时,将造成H的大量增加,同时OH也有一定增加,从而导致预混燃烧速度的显著增大。 相似文献
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热塑性材料与底板间距对其燃烧行为的影响 总被引:2,自引:1,他引:1
为研究热塑性材料下端与底板间距对其熔融燃烧行为的影响,选择 6 mm厚和 4 mm厚 PP 板材作为研究对象,在 ISO 9705 燃烧室内进行了12组大尺寸燃烧实验,分别考虑了0cm、5 cm、10cm、15 cm、25 cm和35 cm不同间距的工况.实验过程中测量了热释放速率、消光系数、CO 体积分数以及温度场等火灾动力学参数.实验结果表明,热塑性材料的下边缘与底板的间距对火灾增长速率影响很大,但是对热释放速率峰值的影响不明显;随着间距的增加,壁面火和油池火之间的相互影响作用逐渐减弱,且当间距增加至 15 cm 以上时,各组实验的燃烧过程没有明显的区别. 相似文献