共查询到19条相似文献,搜索用时 109 毫秒
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谢梦芹 《再生资源与循环经济》2022,(6):36-43
开发了冷轧含铬污泥中温脱硫保铬预处理工艺以及利用含铬污泥制备CaO-MgO-Al2O3-SiO2(CMAS)系统微晶玻璃的工艺,研究了晶核剂对微晶玻璃的物相、显微结构及性能的影响。所开发的工艺过程清洁环保,制品力学性能好、无浸出毒性。本技术不但实现了含铬污泥无害化处理,还发挥了污泥的资源价值,为冷轧含铬污泥的厂内安全低成本处置提供了技术解决方案。 相似文献
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化学循环燃烧载氧体的研究进展 总被引:1,自引:0,他引:1
化学循环燃烧是集分离捕集CO2和去除NOx为一体的新型燃烧技术。介绍了化学循环燃烧的发展背景、工艺原理及特点;综述了化学循环燃烧载氧体的选材、载氧体的性能要求,对各系载氧体(如NiO系、Fe2O3系、CuO系、CoO系和Mn2O3系载氧体)的性能进行了对比分析;提出了Fe2O3、Fe2O3/Al2O3(质量分数为60%的Fe2O3+质量分数为40%的Al2O3)、NiO/NiAl2O3(质量分数为50%的活性NiO+质量分数为50%的NiAl2O3)是当前的优势载氧体,并对载氧体的发展做了展望。 相似文献
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以废弃的阴极射线管锥玻璃碱性浸出渣及屏玻璃混合粉末为原料烧制泡沫玻璃。考察了发泡温度、屏玻璃加入量、发泡剂种类、发泡剂加入量、稳泡剂添加量对所制备的泡沫玻璃密度及抗压强度的影响。实验结果表明:在发泡温度800 ℃、屏玻璃加入量50%(w)、稳泡剂硼酸加入量5%(以锥玻璃碱性浸出渣及屏玻璃粉末总质量为基准,下同)、发泡剂SiC加入量15%最佳条件下烧制的泡沫玻璃密度达417 kg/m3,抗压强度达1.09 MPa,可满足建筑用泡沫玻璃的Ⅳ型物理性能指标。本实验烧制的泡沫玻璃的Pb浸出量为1.27 mg/L,Ba浸出量为0.06 mg/L,均满足固体废物的浸出毒性标准。 相似文献
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以粉煤灰基沸石为载体制备TiO2/沸石光催化剂,采用SEM和XRD对产物进行表征,并考察其对模似废水中亚甲基蓝(MB)的光催化降解活性及再生后的催化性能.实验结果表明:光催化剂中的TiO2主要为锐钛矿晶型;MB降解过程遵循—级Langmuir-Hinshelwood动力学方程;当光照时间为3h、MB质量浓度为10 mg/L、废水pH为7、TiO2/沸石加入量为1.5 g/L时,MB废水的脱色率可达96.46%;经200 W超声波、450℃热再生处理40 min后,再生催化剂对废水的脱色率为73.04%;再生催化剂重复使用8次后,废水脱色率仍可达43.27%. 相似文献
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无 《再生资源与循环经济》2014,(7):3-3
各省、自治区、直辖市环境保护、工业和信息化部门:
2012年以来,在国家废弃电器电子产品处理基金支持下,废弃电器电子产品处理企业拆解处理量不断增加,产生大量阴极射线管含铅锥玻璃(以下简称CRT含铅玻璃)。据估算,我国拆解处理废弃电器电子产品每年将产生CRT含铅玻璃5,8万t,目前包括制备节能灯管等用途在内的年利用处置能力无法满足处理需要。为解决CRT含铅玻璃利用处置难题,现决定在现有处置能力基础上,开展铅冶炼企业协同处置CRT含铅玻璃试点工作。现就有关事项通知如下: 相似文献
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Corrosion behavior of glass and glass-ceramics made of municipal solid waste incinerator fly ash 总被引:3,自引:0,他引:3
Glasses and glass-ceramics were prepared by melting municipal solid waste (MSW) incinerator fly ash and their corrosion properties were evaluated. Corrosion of both materials proceeded in two different steps. At the initial stage, the corrosion process is a diffusion-controlled process. After approximately 10 h at the initial stage, weight losses increased linearly with time due to the total dissolution of glasses or glass-ceramics. Leaching of heavy metals from glasses and glass-ceramics were well within international environmental regulations. Corrosion proceeded uniformly in fly ash glass while Na2CaSiO4 crystalline phase was preferentially dissolved in the glass-ceramics. 相似文献
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Within the European Union, it is estimated that between 8 and 9 million tonnes of waste electric and electronic equipment (WEEE) arises annually, of which television sets and computers account for an important part. Traditionally, Cathode Ray Tubes (CRT) have been used for TVs and computer monitors, but are rapidly being replaced by flat-screen technology. Only part of the discarded CRT glass is being recycled. Primary smelters use large amounts of silica flux to form iron-silicate slag, and can, in most cases, tolerate lead input. Use of discarded CRT glass in copper smelting is a potential alternative for utilization of the glass.The mineralogical composition of a slag sampled during ordinary slag praxis has been compared with that of a mixture of slag and CRT glass when re-melted and slowly cooled. Slag (iron-silicate slag) from Boliden Mineral AB, Sweden, was used for the experiments. Slag and glass have been mixed in various proportions: pure slag, pure glass, 90% slag-10% glass and 65% slag-35% glass, and heated in an inert atmosphere up to 1400 °C in a Netzsch Thermal Analysis (TA) instrument. The re-melted material has been analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) to determine changes in mineralogical composition after mixing with glass.The results show that the main mineralogical component of the slag is fayalite; the CRT glass is amorphous. The main crystalline phases of the slag do not change with addition of glass. An amorphous phase appears when the addition of glass is increased, which gives the sample a different structure. 相似文献
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Monteiro RC Figueiredo CF Alendouro MS Ferro MC Davim EJ Fernandes MH 《Waste management (New York, N.Y.)》2008,28(7):1119-1125
The characterization of the bottom ashes produced by two Portuguese municipal solid waste incinerators (MSWI) was performed with the aim of assessing the feasibility of using this waste as raw material in the production of glass that can be further processed as glass-ceramics for application in construction. Density and particle size distribution measurements were carried out for physical characterization. Chemical characterization revealed that SiO(2), a network glass former oxide, was present in a relatively high content (52-58wt%), indicating the suitability for this waste to be employed in the development of vitreous materials. CaO, Na(2)O and K(2)O, which act as fluxing agents, were present in various amounts (2-17wt%) together with several other oxides normally present in ceramic and glass raw materials. Mineralogical characterization revealed that the main crystalline phases were quartz (SiO(2)) and calcite (CaCO(3)) and that minor amounts of different alkaline and alkaline-earth aluminosilicate phases were also present. Thermal characterization showed that the decomposition of the different compounds occurred up to 1100 degrees C and that total weight loss was <10wt%. Heating both bottom ashes at 1400 degrees C for 2h resulted in a melt with suitable viscosity to be poured into a mould, and homogeneous black-coloured glasses with a smooth shiny surface were obtained after cooling. The vitrified bottom ashes were totally amorphous as confirmed by X-ray diffraction. The results from the present experimental work indicate that the examined bottom ashes can be a potential material to melt and to obtain a glass that can be further processed as glass-ceramics to be applied in construction. 相似文献
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Jang-Soo Lee Heung-Min Yoo Se-Won Park Sung-Jin Cho Yong-Chil Seo 《Journal of Material Cycles and Waste Management》2016,18(3):552-562
While the cathode ray tube (CRT) funnel containing lead could be transported to a smelting facility to recover lead, which could be an available option in domestic, a proper technology to recycle a CRT panel must be developed. Thus, it was suggested that CRT panel glass be used as aggregates of concrete blocks and clay bricks. Samples of blocks and bricks were fabricated with CRT powders and tested to measure their strength and absorption rate to determine their qualities, and environmental soundness was determined by measuring the leaching rate of hazardous metals. For concrete blocks, CRT panel glass powders incorporated as aggregates up to 40 % replacing stone powder was proposed as the proper condition for manufacturing blocks. Around 2 % of CRT panel incorporated into clay brick to substitute Kaoline was suggested to fabricate the best quality of clay brick. Results of leaching test met the criteria with much less concentration of hazardous metals, even lead compound containing in the CRT funnel. To conclude, the use of CRT panel powder after crushing it to the proper size as an aggregate of concrete blocks or clay bricks could be one of the appropriate alternatives to recycle for CRT glass waste being generated drastically in a short term. 相似文献
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Cathode Ray Tube, CRT, waste glass recycling has plagued glass manufacturers, electronics recyclers and electronics waste policy makers for decades because the total supply of waste glass exceeds demand, and the formulations of CRT glass are ill suited for most reuse options. The solutions are to separate the undesirable components (e.g. lead oxide) in the waste and create demand for new products. Achieving this is no simple feat, however, as there are many obstacles: limited knowledge of waste glass composition; limited automation in the recycling process; transportation of recycled material; and a weak and underdeveloped market. Thus one of the main goals of this paper is to advise electronic glass recyclers on how to best manage a diverse supply of glass waste and successfully market to end users. Further, this paper offers future directions for academic and industry research. To develop the recommendations offered here, a combination of approaches were used: (1) a thorough study of historic trends in CRT glass chemistry; (2) bulk glass collection and analysis of cullet from a large-scale glass recycler; (3) conversations with industry members and a review of potential applications; and (4) evaluation of the economic viability of specific uses for recycled CRT glass. If academia and industry can solve these problems (for example by creating a database of composition organized by manufacturer and glass source) then the reuse of CRT glass can be increased. 相似文献
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采用含有二乙二醇(DEG)和乙醇胺(ETA)的双组分解交联剂降解废旧硬质聚氨酯泡沫塑料(PU硬泡),并利用降解得到的低聚物多元醇与木质素复合制备出性能增强的再生PU硬泡。通过对制备的再生PU硬泡的红外光谱、密度、吸水率、抗压强度、热稳定性、导热系数、热重曲线等进行分析测试,考察m(DEG)∶m(ETA)对再生PU硬泡性能的影响。实验结果表明:m(DEG)∶m(ETA)=1∶3时废旧PU硬泡的降解效果最好;木质素加入量为2.0%(w)时再生PU硬泡的密度低、抗压强度高、保温性能良好,达到国家标准《建筑绝热用硬质聚氨酯泡沫塑料》(GB/T 21558—2008)的品质要求。 相似文献
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以二甘醇单丁醚-二甘醇单乙醚-对二甲苯体系为萃取剂,0.1 mol/L的Na OH溶液为反萃取剂,采用三级萃取-反萃取法处理4,4’-二氨基二苯乙烯-2,2’-二磺酸氧化废水,考察了萃取和反萃取的影响因素,并对废水中的可用有机资源进行了回收。实验结果表明:在V(二甘醇单丁醚)∶V(二甘醇单乙醚)=1∶3、V(醇醚)∶V(废水)=2∶5、V(对二甲苯)∶V(废水)=1∶5的最佳萃取条件下,经三级萃取工艺处理后,平均COD去除率达92.0%、平均脱色率达96.4%、BOD5/COD0.3,可生化性明显增强;最佳反萃取条件为V(Na OH溶液)∶V(有机相)=13∶24、反萃取温度60℃;平均总硝基化合物回收率达88.9%,平均萃取剂回收率达96.7%,回收的萃取剂可循环使用。该工艺对废水处理的综合成本约为700~1 000元/t。 相似文献
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The characterization of waste cathode-ray tube glass 总被引:3,自引:0,他引:3
New re-use applications are needed to address the relatively large quantity of waste electronic products generated in the world. Cathode-ray tubes (CRTs) from computer monitors and TV sets are a large component of such waste. The three glass components of CRTs are the funnel, panel and neck, which are produced by various manufacturers and are now collected by asset-recovery centres. In this paper, we characterize waste funnel and panel glass from dismantled cathode-ray tubes with a view to assisting the development of new re-use applications. The heavy metal (lead, barium, and strontium) content of such glass represents an acute risk to the environment. Our results of the chemical composition for different kinds of waste CRT glass including black & white and color CRTs show that CRT glass from different producers have generally similar chemical compositions. In particular, the compositions of funnel and panel black & white CRT glass are similar, but are different to those of panel and funnel color CRT glass. We also measured the following specific properties of each type of CRT glass: density, glass transition temperature, and linear coefficient of thermal expansion. It was found that the coefficients of thermal expansion of CRT glass do not vary with their composition. In contrast, the measured densities and glass transition temperatures do vary with composition. On the basis of our experimental data and data found in the literature, we outline the main properties of several waste CRT glass currently in circulation. The aim of this study was to provide the data required to determine if this kind of waste could be entirely (or partially) re-used and to aid the search for promising methods of treatment. 相似文献