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Damage reasons of purging plugs for refining ladle and research progress on thermal shock resistance of corundum- spinel purging plugs were summarized. Research achievements and application results of nonoxides bonded corundum purging plugs for refining ladle were briefly reviewed. The further research and developing trend of purging plugs was proposed. 相似文献
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我国超细粉碎技术现状及发展前景 总被引:7,自引:0,他引:7
孙成林 《硫磷设计与粉体工程》2001,(1):11-15
回顾了我国超细粉碎技术的发展历程,介绍了我国超细粉碎设备、分级设备以及超细粉粒度测定仪器设备的现状和发展情况,并从市场的角度出发,指出尚存在的问题和提出解决的办法。 相似文献
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塑料填充技术研究现状及发展趋势 总被引:1,自引:0,他引:1
主要介绍了塑料填充技术的研究现状;并分析了无机粉体在填充料中的选择研究、粉体复合技术研究以及新产品技术;阐述了塑料填充技术存在的问题及发展方向. 相似文献
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草甘膦生产工艺综述及其发展趋势 总被引:6,自引:0,他引:6
介绍了草甘膦的生产工艺,对两种工艺进行了对比分析,指出了草甘膦行业存在的问题,对草甘膦生产的技术进步方向和行业发展趋势进行了综述. 相似文献
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生物活性炭技术结合并优化了活性炭吸附和生物降解两种作用,在水处理和废气治理等方面显示了突出的效果。文章总结了近年来国内外生物活性炭技术的研究和应用成果,并指出了以后的研究方向。 相似文献
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分析了目前国内塔式熔体造粒技术现状及存在的问题,展望了塔式熔体造粒技术的发展趋势.今后塔式熔体造粒生产装置的建设应与尿素、硝酸、硝酸铵等原料的生产装置相配套为宜,也可与精细磷酸盐企业结合生产高浓度水溶复合肥. 相似文献
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首先研究了氮化钛(TiN)加入量(分别外加质量分数1%、2%和3%)对镁碳砖高温性能的影响,然后在确定其加入量的基础上研究了复合加入TiN和Al对镁碳砖高温抗折强度、抗氧化性和抗渣侵蚀性等高温性能的影响,并分析了渣蚀后试样的化学组成及物相变化。结果表明:镁碳砖中外加TiN的质量分数以不超过2%为宜;TiN和Al复合加入到镁碳砖中,可使镁碳砖的高温抗折强度、防氧化效果和抗渣侵蚀性等高温性能均有很大提高,且以复合外加2%质量分数TiN和1%质量分数Al的镁碳砖试样综合高温性能最佳。 相似文献
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利用沉淀法制备的纳米二氧化硅(PNS)极强的火山灰活性,能改善大掺量矿粉-水泥胶凝体系早期抗压强度低、内部结构疏松等缺陷,研究了PNS对大掺量矿粉-水泥胶凝体系抗压强度、抗氯离子渗透性的影响,通过XRD、TG-DSC及MIP对该体系的水化产物与孔结构进行微观分析。研究表明:随着PNS掺量的增加,试件的抗压强度也随之提高,尤其是7 d抗压强度,掺5%(质量分数,下同)PNS试件的强度增幅达到了20%;同时,水泥抗氯离子渗透能力先上升后下降,PNS掺量为3%时,达到最优,其28 d氯离子扩散系数较不掺PNS降低44.8%。PNS在早期能够大量消耗Ca(OH)2,生成更多的C-S-H凝胶等水化产物,使得孔结构更加致密,降低孔隙率,在适宜范围内掺入PNS还可有效细化孔径。 相似文献
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《Journal of the European Ceramic Society》2023,43(8):3794-3803
In this study, two kinds of MgO ceramic filters were prepared by using porous magnesia powder and fused magnesia powder as raw material, respectively. The microstructures, mechanical properties and purification efficiency on the molten steel of two MgO ceramic filters were investigated by mercury porosimetry measurement, SEM, EDS and immersion test with molten steel, etc. The results demonstrate that compared with the filter FM prepared from the fused magnesia powder, the rheological property of the slurry of the filter PM was improved via the finer and uniformly distributed nano-sized Mg(OH)2 particles generated by the hydration of the porous magnesia powder, which not only optimized the macropore structure but also promoted the growth of the sintering neck between the microparticles of the skeleton. Therefore, the MgO filter skeleton with a microporous structure was obtained, which elevated the strength and thermal shock resistance of the filter PM. According to the immersion tests with the molten steel, both filters significantly reduced the number of inclusions with size < 5 µm2 in the molten steel as well as their total oxygen contents, and the filter PM had better purification efficiency than the filter FM. The reason for the better purification efficiency of the filter PM was related to its smaller micro-sized pores, larger surface roughness, and certain high-temperature liquid phase in their skeletons. In general, the porous magnesia powder resulted in higher compressive strength, better thermal shock resistance and superior purification efficiency on the molten steel of the filter compared with the fused magnesia powder. 相似文献
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Faliang Li Cao Tan Jianghao Liu Junkai Wang Quanli Jia Haijun Zhang Shaowei Zhang 《Ceramics International》2019,45(7):9611-9617
Herein, we prepare phase-pure ZrB2-SiC composite powders by molten-salt-mediated reduction of ZrSiO4/B2O3/activated carbon mixtures with Mg, showing that the phase composition and morphology of the above composites is influenced by firing temperature, B:Zr and C:Si molar ratios, and the amount of excess Mg. Notably, phase-pure ZrB2-SiC powder with a ZrB2:SiC weight ratio of ~75:25 could be obtained by 3-h firing at 1200?°C, i.e., at a temperature lower than that used for conventional carbothermal reduction by at least 200?°C. As-prepared ZrB2-SiC composites exhibited grain sizes of several microns and comprised SiC nanoparticles well distributed in the ZrB2 matrix. Finally, the oxidation activation energies of the prepared ZrB2 and ZrB2-SiC powders were determined as 326 and 381?kJ/mol, respectively, which demonstrated that the introduction of SiC improved the oxidation resistance of monolithic ZrB2. 相似文献