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环境保护部和国土资源部发布的《全国土壤污染状况调查公报》显示,中国重金属污染土壤已经对生态环境和人体健康造成严重的危害,必须采取有效的措施对污染土壤进行修复与改良处理。利用钢渣具有的高碱性、多孔性和胶凝性制备钢渣基修复材料用于土壤修复与改良成为重要途径之一。基于钢渣的物化性质,对钢渣基修复材料作为土壤修复与改良的药剂进行具体分析;阐述钢渣基修复材料在土壤修复与改良中的工程应用,并就目前钢渣基修复材料的技术发展进行评述。在此基础上,指出优化钢渣基修复材料性能、拓展其在不同性质土壤的应用,以及结合草坪种植、休闲农业种植、农业景观设计等开发多种钢渣基修复材料,是钢渣修复与改良土壤未来的主要发展方向。 相似文献
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以钢渣超微粉和花生壳为原料制备钢渣–花生壳基生态活性炭,基于响应曲面法研究微波功率、浸渍比、钢渣掺量和钢渣细度对钢渣–花生壳基生态活性炭对甲醛气体吸附率的影响,并对其进行优化处理.利用X-射线红外光谱仪、场发射扫描电镜、比表面积及孔径测定仪等对钢渣–花生壳基生态活性炭进行表征分析.结果表明:钢渣–花生壳基生态活性炭最优制备参数为微波功率530 W,钢渣细度1160目,钢渣掺量(质量分数)10.8%,浸渍比1.25,其对甲醛气体的吸附率为94.14%.影响钢渣–花生壳基生态活性炭性能的因素次序依次为:微波功率、钢渣掺量、浸渍比、钢渣细度,其中微波功率与浸渍比、微波功率与钢渣掺量、钢渣掺量与钢渣细度均存在显著交互作用.适量钢渣改性活性炭有利于形成规则的孔结构、提高表面酸性官能团含量以及增强表面极性. 相似文献
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在阐述钢渣的分类、钢渣的性质、钢渣处理工艺的基础上,指出钢渣在厂内循环利用时可用做冶金原料、烧结熔剂、炼钢熔剂,并提出了实现钢渣利用的途径和钢渣返回利用应注意的问题。 相似文献
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钢渣的体积不安定性不良是约束其用于道路材料的的主要因素之一。钢渣的体积安定性预处理是钢渣有效资源化利用的关键,也是提高钢渣在道路材料方向利用率的必备条件。针对钢渣的体积不安定性问题,分别从钢渣集料的特性、引起钢渣体积不安定性的因素、引起钢渣体积不安定性因素的测定方法和改善钢渣体积安定性的预处理措施4个方面综述了国内外对钢渣体积安定性的研究进展和现状。结果表明,钢渣集料的性能较好,但矿物成分复杂,其中引起钢渣体积不安定性的主要因素是游离氧化钙和游离氧化镁,其在一定条件下能使钢渣膨胀开裂,约束了钢渣的应用;乙二醇-EDTA-TG差热分析法和EDTA滴定法是测定钢渣中游离氧化钙和游离氧化镁含量较准确、较普遍的测定方法;国内大部分的预处理改善措施是针对钢渣中的游离氧化钙,包括自然陈化、蒸汽养护、表面改性处理、化学处理和碳化处理等,表面改性和化学处理为近几年钢渣的预处理措施热点,碳化处理能将钢渣膨胀率降低70%~90%,与其他处理措施相比效果较好,但对设备要求较高,成本较高;而国外主要是采取自然陈化的方式改善钢渣的体积安定性。因此,钢渣的预处理需要具有社会、经济、环境等效益的同时才能大规模应用,这需要科研人员更加深入地研究和探讨,最后结合前人的研究对未来钢渣资源化利用于道路材料的发展提出建议和展望。 相似文献
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通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。 相似文献
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K Ohta M Nishi M Ueda S Ohyama T Matsubara T Takahashi T Nakajima 《Canadian Metallurgical Quarterly》1998,99(9):589-594
Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients. 相似文献
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Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed. 相似文献
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TA Solokhina LS Shevchenko IuV Se?ku EG Rytik LV Besedina TS Veshchugina 《Canadian Metallurgical Quarterly》1998,98(6):42-46
Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined. 相似文献
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