共查询到19条相似文献,搜索用时 109 毫秒
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对于炼钢工业中使用过的耐火材料,其典型的处理方式是采用填埋法。由于环保要求不断提高,故在全世界范围内正在努力开发可以选择的、环境适宜的、经济可行的回收利用方法。由于在高温时的化学反应,使用过的耐火材料发生了显著的化学变化。文中介绍了将废弃的铝碳耐火材料回收利用,以一定比例与未用过的耐火材料混合,研究了其高温损毁程度和铁水渗透深度的变化。 相似文献
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简要分析了水泥回转窑各带耐火材料的性能要求和损毁原因;归类总结并详细分析了窑内常用耐火材料——高铝砖、直接结合镁铬砖、尖晶石砖和高铝浇筑料的性能特点和损毁原因。在此基础上,强调了废弃耐火材料再生循环利用在控制环境危害、节约人类资源和提高产品附加值方面的积极意义。 相似文献
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耐火材料的高温性能在很大程度上是由其高温相组成决定的。对耐火材料的高温相组成进行定量计算,对于正确估计耐火材料的性能和质量以及能够胜任的使用条件具有重要意义。几十年来耐火材料工作者发展了用四元锥形投影相图对某些耐火材料高温相组成进行定量计算的方法。利用锥形投影相图对碱性耐火材料高温相组成进行定量计算 相似文献
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为提高镁质含碳耐火材料中氧化镁的利用率,对该材料中的氧化镁进行提纯。以废弃镁质含碳耐火材料为原料,设计感应加热装置模型,利用感应炉加热系统对含碳原料加热,用碳热还原氧化法将废弃镁质含碳耐火材料中的氧化物在高温还原气氛下,还原成气相并在空气中氧化形成氧化镁粉体。经化学分析、XRD、SEM等测试发现,氧化镁粉体材料中氧化镁含量大于98%(质量分数),氧化镁粉体晶粒粒径为2~3μm,尺寸均匀。通过热力学分析,采用碳热还原氧化法还原生成的SiO气相在氧化过程中受到了Mg(g)、Ca(g)钙气相氧化的抑制作用。 相似文献
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在DRI熔炼期间进行了电炉和钢包用MgO-C耐火材料的回收利用。进行了冶炼试验,以确定耐火材料回收对能源消耗、熔炼时间、熔剂消耗和耐火材料消耗的影响,制备方法以及喷射方法也包括在内。依据目前的研究结果,推荐对废弃的耐火材料回收利用。目检表明,在开始加热时对渣起泡有益,允许使用全部的功率变压器,反过来导致快速的熔炼率。 相似文献
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Changing environmental awareness and regulations, the cost of waste disposal, and concerns about future liabilities have caused increased interest in recycling of spent refractories. The densification parameters of spent magnesite containing up to 10.0 wt.% spent ZAS (zirconium aluminium silicate) sintered at 1450–1550 °C were investigated. X-ray, microstructure and microchemistry analysis were used to establish the present phases. The technological parameters in terms of RUL (refractoriness under load) and TSR (thermal shock resistance) of the prepared refractories attaining their maximum densification were evaluated. The results revealed that, the addition of spent ZAS up to 5.0 wt.% to spent magnesite enhanced the physico-mechanical, refractory and thermal properties due to the development of highly refractory phases MA spinel and MgO·ZrO2 solid solution. Samples containing more than 5.0 wt.% spent ZAS exhibited lower refractory and thermal properties due to the formation of M2S ferroan beside the high flux CMS phase. 相似文献
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This article discusses the problem of recycling wastes in the form of spent refractories and heat-insulating materials in
the lining of electrolysis baths used to produce aluminum. The environmental effects of fluorocarbons in the cathode lining
are evaluated, and a survey is made of methods that can be used to recycle wastes generated in aluminum production. 相似文献
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用后耐火材料的再生利用 总被引:8,自引:9,他引:8
综述了国内外对用后耐火材料再利用的情况及其发展趋势。同时介绍了宝钢的有关情况 ,特别是报导了对用后耐火材料的再利用研究成果。再生产品的性能可以接近或达到新产品的水平 ,有些甚至能达到优质耐火材料的水平。 相似文献
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《Ceramics International》2017,43(6):5020-5031
Despite environmental pressures and intrinsic recycling potential, spent refractories waste is generally considered an economically unattractive waste stream. This work proposes an upgraded view of the debris recovered from dismantled spinel-bonded high-alumina linings of steel induction furnaces, demonstrating that it can be reused in the form of vibratable and self-flowing castable systems. The recovered material retains the microstructural distribution of in situ spinel formation without the corresponding disruptive expansion, mirroring the use of pre-formed spinel without the onus of a pre-firing. The mechanical performance after firing was found to be always best for the self-flowing system, which is also less affected by changes in added-water content. There is potential for large usages of cleaned waste (50–60 wt%), which helps reducing the supply risk for major refractory primary raw materials as well as landfilling costs. 相似文献
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简单介绍了工业废料的现状,重点阐述了废料在耐火材料中的研究与应用现状,以及废弃料合成耐火原料的方法、再利用途径和发展前景。 相似文献
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This work aims at benefit from the huge quantities of the ceramic wastes in KSA through recycling them to produce mullite-based refractories with expected 相似文献
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Yu Zhang Junfeng Chen Nan Li Yaowu Wei Bingqiang Han Yaping Cao Guangqiang Li 《Ceramics International》2018,44(14):16435-16442
In the present work, the recycling of Si/SiC solid waste from photovoltaic industry for MgO-C refractories preparation has been introduced. The influence of solid waste powders as antioxidant additive on microstructure evolution, mechanical properties and thermal shock resistance of MgO-C refractories has been investigated systematically. With 4?wt% Si/SiC rich solid waste addition, the MgO-C refractories exhibited the highest strength (4.39?MPa) and residual Young's modulus (7.86?GPa) after firing at 1400?°C, compared to only Si or SiC-addition. The presence of iron in the solid waste also promoted the formation of MgO and Mg2SiO4 whiskers via catalyst-assisted method. Moreover, a dissolution-saturation-precipitation growth mechanism was used to explain the formation process of the whiskers. The improvements in strength as well as thermal shock resistance can be attributed to the microstructural evolution. 相似文献
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随着反渗透(RO)技术在水处理领域的广泛应用,全球每年有数百万计的废旧RO膜组件作为垃圾被处理处置,由此造成了环境污染与资源浪费。本文首先综述了废旧RO膜可能的循环再利用方案和相关的应用案例,为了比较不同循环方式对环境的影响,概述了通过全生命周期分析(LCA)的方法评价不同循环利用方式的环境效益和物质投入的研究进展。文章指出研究结果表明:回收利用废旧RO膜是研究RO膜末端处理的方法之一,其中包括通过使用清洗后的RO膜作为新生RO膜直接再利用、通过化学转化为其他多孔膜材料再循环使用、通过清洗RO膜拆解回收RO膜。另外,LCA在膜工艺中的分析仍以评估使用过程为主,而缺少在膜设计、膜改造和膜回收等关键过程的分析研究。 相似文献
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大规模储能与电动汽车市场的发展壮大对锂离子电池的需求水涨船高,由此产生的废旧锂离子电池数量也即将迎来爆发式增长。废旧锂离子电池正极材料蕴含丰富的锂、钴、镍、锰等有价金属元素,回收经济价值高,环境效益显著。低共熔溶剂(DESs)作为一种绿色溶剂,在废旧锂离子电池有价金属元素回收方面显示出巨大的潜力。本文在简要介绍DESs性质及应用的基础上,系统综述了DESs在废旧锂离子电池正极材料回收链中的研究现状,主要包括正极材料的分离、活性物质的浸出以及有价金属的提取,着重介绍了现阶段回收的方法及工艺流程,比较了不同DESs浸出正极活性物质的优缺点,探讨了当前DESs在废旧锂离子电池回收中的共性问题,并展望了未来DESs回收锂离子电池的发展方向。 相似文献