共查询到20条相似文献,搜索用时 78 毫秒
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本文对蒽醌法生产过氧化氢工艺中所产生的废氧化铝,废碳酸钾溶液和工作液洗水的处理进行了研究。确定了回收利用与处理的工艺路线。 相似文献
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为了对废聚苯乙烯泡沫塑料(WPS)资源化利用,通过对WPS进行催化裂解的方法,研究了催化剂种类和裂解温度对裂解时间、裂解油产率、苯乙烯回收率以及裂解油纯度的影响。研究结果表明,催化剂种类和裂解温度对裂解反应有着重要影响。裂解温度升高,裂解油产率提高,裂解时间缩短,但苯乙烯选择性下降;低于380 ℃时,氧化钙的裂解油产率和裂解时间优于氧化铝和氯化铝,但苯乙烯的选择性劣于氧化铝和氯化铝;高于400 ℃时,氯化铝、氧化铝和氧化钙的催化活性接近。在实验条件下,WPS催化裂解的最佳催化剂为氯化铝,380 ℃下的裂解时间为25 min,裂解油产率为85.48%,裂解油中苯乙烯含量为80.66%(w),且副产物较少。 相似文献
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氧化铝厂赤泥附液湿法脱硫研究 总被引:1,自引:0,他引:1
对氧化铝厂赤泥附液吸收净化SO2废气进行了研究.赤泥附液吸收SO2具有吸收效率高、吸收容量大、易控制、操作简便等优点,在较长时间内对SO2的吸收效率保持在99%以上. 相似文献
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粉煤灰是电力行业排放的主要固体废弃物,对其的资源化利用已成为环保的首要任务。对粉煤灰进行高附加值的资源化回收利用,是实现可持续发展的必经之路。介绍了大唐国际成功开发研制的从高铝粉煤灰中提取氧化铝技术,开辟了粉煤灰综合利用的新途径。 相似文献
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《再生资源与循环经济》2017,(5)
正2017年4月22日,中国循环经济协会在北京市组织召开了由内蒙古大唐国际再生资源开发有限公司等单位完成的"高铝粉煤灰提取氧化铝多联产技术开发与产业示范"项目科技成果评价会议。评价组由中国矿业大学(北京)、北京有色金属研究总院单位的院士、专家组成。工信部节能司、内蒙古自治区经信委、大唐国际内蒙古分公司、大唐国际发电 相似文献
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《矿山资源开发利用与环境保护》2002,(6):1-2,11
煤矸石中的煤系高岭岩,可用来生产氧化铝、氢氧化铝及硫酸铝、白炭黑等。而以煤矸石为原料制备沸石分子筛,则是一条更经济实用的应用途径,目前已合成A型、X型等沸石。作者以煤矸石为原料,采用导向剂法成功合成Y型沸石。 相似文献
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高效铝屑再生熔炼炉主要由熔化室、循环泵、加料井、循环管路四部分组成。该炉采用循环泵为铝液流动提供动力,使铝液在特殊结构的加料井中形成非接触式漩涡。该漩涡强度大,对铝屑的沉熔效果好,铝屑氧化烧损小,是一种技术先进、高效的铝屑再生熔炼炉。 相似文献
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闫辉 《再生资源与循环经济》2014,(5):42-44
熔炼是铝合金生产过程中的重要环节.分析了铝熔炼过程中各个阶段的特点,对反射式熔铝炉各部位要求进行阐述;在反射式熔炼炉的基础上,介绍了目前再生铝行业较先进的熔炼设备——双室炉,同时提出了铝熔炼设备的发展方向. 相似文献
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Long-term hydrogen generation was observed in a Bavarian mono-landfill for municipal solid waste incineration (MSWI) residues. Hydration reactions of non-noble metals, especially aluminum, predominantly produce hydrogen at alkaline reaction conditions. Microscopic investigations show that aluminum metal may occur in different forms: as larger single grains, as small particles embedded in a vitrified matrix or less frequently in blowholes together with metallic silica.Four types of corrosion texture were observed, indicating different reaction mechanisms: aluminum hydroxide rims caused by hydration reactions at alkaline reaction conditions (reaction type 1) and multiphase rims with ettringite and hydrocalumite due to the reaction of aluminum hydroxide with sulfate and chloride ions which are solved in the pore water (reaction type 2). Galvanic corrosion textures due to the electric potential difference between aluminum and embedded intermetallic Fe- or Cu-rich exsolution phases lead to two further corrosion textures: Strong hydration effects of aluminum except a border of aluminum remnant directly beside the Fe- or Cu-rich segregations were only observed in fresh samples (reaction type 3). The reaction type 4 shows a network of Al-hydroxide veins occurring along the embedded intermetallic Fe- or Cu-rich exsolution segregation pattern within the metallic aluminum grain. Metal particles enclosed in vitrified particles offers the potential for future corrosion processes.The occurrence of corrosion types 1, 2 and 3 in fresh bottom ashes indicates that these reaction mechanisms predominate during the first reaction period in the presence of chlorine in an alkaline solution. Corrosion type 4, however, was additionally observed in aged samples. Here aluminum acts as sacrificed anode implying electrochemical reaction due to electrolytic pore water. Chloride in the system keeps the reaction alive as Al-hydroxide is solved which normally builds a protection shield around the aluminum metal particles.Due to field observations and experimental results we have reasonable indications that after an initial strong formation of hydrogen the reaction time for hydrogen production in the landfill is lengthened for several decades by the presence of chloride in the alkaline pore water. 相似文献
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A study was performed into relations between physical properties of aluminum packaging waste and the corresponding aluminum scraps in bottom ash from three typical incineration processes. First, Dutch municipal solid waste incineration (MSWI) bottom ash was analyzed for the identifiable beverage can alloy scraps in the +2mm size ranges using chemical detection and X-ray fluorescence. Second, laboratory-scale pot furnace tests were conducted to investigate the relations between aluminum packaging in base household waste and the corresponding metal recovery rates. The representative packaging wastes include beverage cans, foil containers and thin foils. Third, small samples of aluminum packaging waste were incinerated in a high-temperature oven to determine leading factors influencing metal recovery rates. Packaging properties, combustion conditions, presence of magnesium and some specific contaminants commonly found in household waste were investigated independently in the high-temperature oven. In 2007, the bottom ash (+2mm fraction) from the AEB MSWI plant was estimated to be enriched by 0.1 wt.% of aluminum beverage cans scrap. Extrapolating from this number, the recovery potential of all eleven MSWI plants in the Netherlands is estimated at 720 ton of aluminum cans scrap. More than 85 wt.% of this estimate would end up in +6mm size fractions and were amenable for efficient recycling. The pot furnace tests showed that the average recovery rate of metallic aluminum typically decreases from beverage cans (93 wt.%) to foil containers (85 wt.%) to thin foils (77 wt.%). The oven tests showed that in order of decreasing impact the main factors promoting metallic aluminum losses are the packaging type, combustion temperature, residence time and salt contamination. To a lesser degree magnesium as alloying element, smaller packaging size and basic contaminations may also promote losses. 相似文献
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Metallic aluminum in MSWI fly ash: quantification and influence on the properties of cement-based products 总被引:1,自引:0,他引:1
This article focuses on the effects of metallic aluminum contained in municipal solid waste incineration (MSWI) fly ashes on cement-based materials in which they are added. The ash under study was treated by an industrial physicochemical process of neutralization. The paper also presents a method to quantify the metallic aluminum content of ash: it consists in measuring the amount of hydrogen gas produced by the oxidation reaction of metallic aluminum. This method is simple and fast. Results show that studied ash contains an appreciable amount of metallic aluminum. Investigations were carried out to study the incorporation of the ash in concrete: in this case, the presence of metallic aluminum is worrying because it could be responsible for disorders in concrete. In fact, swellings are observed on cement pastes and mortars containing ash during the first 24 h of hydration. A test based on hydrostatic weighing permits to quantify the swelling of fresh cement paste and to study the evolution of this swelling. Causes of swelling are analyzed. Results show that ettringite formation occurs after the end of the expansion reaction. So it can be concluded that metallic aluminum is the sole responsible for the observed swelling. Consequences of swelling are also analyzed by measuring compressive strength of ash-containing mortars: this swelling leads to cracks in the mortars and significant decrease of their compressive strength. 相似文献
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