镁砂加入量对铝镁质干式捣打料性能的影响

以电熔白刚玉和电熔镁砂为原料,硼酸为助烧结剂,固定白刚玉骨料、硼酸外加量和基质料中（MgO＋Al2O3）总量不变,只改变基质料中镁砂细粉和刚玉细粉的加入比例,研究了不同镁砂加入量对铝镁质干式捣打料性能的影响。研究结果表明,镁砂加入量对铝镁质干式捣打料性能影响较大,当基质中ω（MgO）／ω（Al2O3）=0．50时,尖晶石生成较多,且微过量的MgO还有利于尖晶石晶体的生长致密化,促进材料的烧结,使试样高温烧后线变化较小,常温耐压强度高,抗渣性能好。     

超低水泥铁沟浇注料的研究及工业化应用

高炉用Al2O3-SiC-C质铁沟浇注料的高温性能主要与水泥的加入量有关,为了探明水泥与Al2O3-SiC-C铁沟浇注料性能的相关性及如何提高Al2O3-SiC-C铁沟浇注料的高温使用性能,对水泥加入量对材料性能的影响。本文以电熔棕刚玉颗粒、碳化硅颗粒与细粉、硅微粉、α-Al2O3微粉、白刚玉微粉、Secar71水泥、Si粉、球沥青为主要原料,分别加入质量分数为0、0.4%、0.6%、1%、1.5%的水泥等量替代白刚玉微粉,外加质量分数为4.5%的水搅拌均匀,振动浇注成型,研究了水泥加入量对浇注料经各温度热处理后常温物理性能及高温抗折强度的影响。结果表明:随着水泥加入量的增加,试样110℃烘干24 h后的体积密度及抗折耐压强度逐渐增大,1 500℃保温3h后的体积密度及强度逐渐降低。其原因分析水泥的增加会形成更多的钙长石、钙黄长石等低共熔相,水泥加入少,高温下低共熔相形成少,形成较多莫来石晶相,对高温性能有利,但水化产物少,常温性能要求得不到保障。加入水泥质量分数为0.6%时,浇注料的综合性能最好。根据试验实研究结果,添加0.6%水泥的铁沟浇注料在铁沟应用中取得了较好的效果。     

α-Al2O3纳米粉复合高纯刚玉砖基质颗粒组成的研究

研究了α-Al2O3纳米复合高纯刚玉砖基质中的微粉、α-Al2O3纳米粉的加入量对基质流变性的影响,结合试样的烧后性能确定其基质的最佳颗粒组成。结果表明:随着α-Al2O3微粉加入量的增加,泥浆的粘度和剪切应力逐渐减小,当α-Al2O3微粉加入质量分数为14%时,粘度值最低,继续增加α-Al2O3微粉,泥浆的粘度和剪切应力逐渐升高;随着α-Al2O3纳米粉加入量的增加,泥浆的粘度和剪切应力逐渐增大。固定微粉含量,随着α-Al2O3纳米粉加入量的逐渐增加,刚玉砖的体积密度、常温抗折强度及高温抗折强度先增大后减小,当α-Al2O3纳米粉加入量为1%时,三者均达到最大值。综合以上研究,确定基质颗粒组成为:纳米粉含量为1%,微粉含量为8%,细粉为31%。     

复合碳源对铁沟浇注料性能的影响

以电熔棕刚玉、97碳化硅、硅微粉、Al_2O_3微粉、白刚玉微粉、Secar71高铝水泥、金属硅粉、高温沥青粉及Carbores P为主要原料,先分别以0、1%、2%、3%的高温沥青粉替代白刚玉粉,外加质量分数为4. 5%的水均匀搅拌,振动成型,探究了高温沥青粉加入量对浇注料流动性、常温物理性能及高温抗折强度的影响,确定了高温沥青粉的最佳加入量;以此为基础,再分别以0、0. 5%、1%、1. 5%的Carbores P等量替代白刚玉粉,外加质量分数为4. 8%的水搅拌均匀,振动浇注成型,进一步研究了Carbores P对浇注料性能的影响。结果表明:随着高温沥青粉加入量的增加,相同加水量浇注料的流动性变差,体积密度减小,显气孔率升高,强度降低,当高温沥青粉加入质量分数为2%时,浇注料的综合性能最佳;在沥青粉确定为2%加入量的前提下,外加1%的Carbores P可以使该浇注料的强度增加,抗氧化性较好,但当Carbores P加入量超过1%后,浇注料流动性显著降低,显气孔率升高,强度降低。根据研究结果,以2%质量分数的高温沥青粉配合1%质量分数的Carbores P作为复合碳源制备的Al_2O_3-SiC-C铁沟浇注料,在现场应用中取得了较好的效果。     

MgO基浇注料基质流变性的研究

浇注料的流变性在很大程度上受基质流变行为的影响和控制。研究了影响MgO基无水泥浇注料基质流变行为的多种因素如：加水量、SiO2微粉、Al2O3微粉、分散剂、镁砂细粉粒度、刚玉细粉加入量以及Sialon加入量。基于研究的结果,提出流变性较好的基质组成的合适范围。     

抗氧化钢包浇注料的研制与现场应用

为了增强钢包用铝镁浇注料的抗氧化性能,以高铝料、板状刚玉、镁砂、尖晶石粉、氧化铝超微粉、二氧化硅微粉、炭黑、抗氧化抗侵蚀剂ACAO为主要原料制备铝镁浇注料,实验了增碳剂炭黑及防氧化剂ACAO的配合使用对浇注料各个温度段强度及抗氧化性的影响,分别引入从0到2％的ACAO,以0.5％为差额,等量替代刚玉粉,对制得的试样检测...     

镁质浇注料的研究及其在中频感应炉上的应用

以中档镁砂为主要原料,硅微粉、三聚磷酸钠或六偏磷酸钠为结合剂,925高铝水泥为固化剂,铬微粉与α-Al2O3微粉为浇注料的微粉原料,研究了结合剂种类与加入量、微粉加入量与添加方式对镁质浇注料性能的影响。并介绍了镁质浇注料在0．5t中频感应炉坩埚上的实际应用效果。     

微粉对低水泥耐火浇注料性能的影响

以高铝矾土熟料为主要试验原料,研究了硅微粉和-Al2O3微粉对低水泥浇注料体积密度、显气孔率、抗折强度和耐压强度等性能的影响,并确定了两种微粉在低水泥浇注料中的最佳掺量。     

自流成型蜂窝体的研制与应用

以电熔白刚玉、莫来石、氧化锆细粉、硅微粉、氧化铝微粉、纯铝酸钙水泥添加剂等为主要原料,研究了自流料的高温性能和热震稳定性。结果表明,所研究的自流料具有良好的高温性能和热震稳定性,自流成型的蜂窝体在蓄热式加热炉上使用,寿命已达一年,目前仍在使用。     

非氧化物(SiC,SiAlON)对矾土基浇注料流变性的影响

研究了加入非氧化物(SiC,SiAlON)对矾土基浇注料基质流变性和浇注料流动性的影响,结果表明:加入适量的SiC细粉(不超过8%)有利于提高浇注料流变性;SiAlON细粉对浇注料流变性有不利影响,但若采用合适的高效分散剂可部分消除这种负面作用。在微粉总量相同的条件下,SiO2微粉含量高的含非氧化物浇注料流动性较好。     

炼钢用后镁碳砖规模化全量利用的工艺开发与实践

介绍了炼钢厂使用后废弃的镁碳砖的回收利用,将其制备成为w（MgO）＞ 40％的镁球,用于转炉炼钢,替代部分白云石作为造渣辅料,起到优化转炉冶炼造渣工艺、改善炼钢垃圾对环境污染的作用,实现了废弃镁碳砖在炼钢工艺中的全量利用.     

Cu-Ni/γ-Al2O3催化剂上二甲醚水蒸气重整制氢工艺条件的研究

采用沉积沉淀法制备了Cu-Ni/γ-Al2O3催化剂,在连续流动的固定床反应器内,进行了二甲醚水蒸气重整制氢反应的研究,考察了还原温度、反应温度、系统压力、气体空速以及催化剂的粒径大小等工艺条件对Cu-Ni/γ-Al2O3催化剂上二甲醚水蒸气重整制氢反应性能的影响。实验结果表明,较优的工艺条件为:催化剂还原温度为400℃,粒径为0.45～0.90mm,反应温度为350℃,常压,气体进料空速为3240mL.(gcat.h)-1。     

LF精炼炉用不烧镁钙砖的研制与使用

以合成镁钙砂、电熔镁砂为原料,以无水树脂做结合剂,添加适量的添加剂,研制出了LF精炼炉用不烧镁钙砖。在某钢厂90t LF精炼炉上使用,取得了较长的使用寿命和良好的冶金效果,满足了该钢厂精炼多种特殊钢的需要。     

Performance analysis of waste brick magnesia as a storage material in a solar still

In this current study, a single basin solar still (SBSS) was explored in the climatic state of Patan (23.84° N, 72.12° E) India over March 2019. The SBSS was examined with the use of waste brick magnesia (WBM) for the same amount of water (10 L). For experimentation, three same-sized SBSS were taken with 3 and 6 kg WBM and without storage materials. It was found that a daytime yield for SBSS of 2.27 L without storage materials was obtained; and this was reduced for SBSS with 3 and 6 kg WBM to 1.96 and 1.75 L, respectively. It has also been noticed that the yield of SBSS during off-sunshine hours due to the energy storage capacity increased with WBM but the combined (daytime + off-sunshine hours) yield was found reduced with an increment in a mass of the WBM. It was found that the maximum instantaneous thermal efficiency of the SBSS without WBM, 3 and 6 kg WBM was 60.24%, 45.65%, and 54.26%, respectively. Overall thermal efficiency was also determined and obtained to be higher for SBSS without WBM as storage.     

2205双相不锈钢硅铝复合脱氧的实验研究

在实验室进行了不同加铝量的2205双相不锈钢硅铝复合脱氧及钙处理的热模拟实验,研究了钢中铝含量对总氧含量和脱氧产物的影响。结果表明:在一定的加铝范围内,加入的铝粒越多,钢中酸溶铝Al S含量越高,最终的氧含量越低。未加铝粒的实验组中,脱氧阶段夹杂物类型为SiO_2-Al_2O_3-MnO和SiO_2-Al_2O_3-MnO-MgO。加入铝粒的实验组中,钢中w(Al_S)0.005 4%,脱氧阶段夹杂物为SiO_2-Al_2O_3-MnO和MgO-Al_2O_3,加入铝含量越多,SiO_2-Al_2O_3-MnO夹杂物成分中Al_2O_3的含量越多;w(Al_S)≥0.005 4%,脱氧阶段夹杂物只有MgO-Al_2O_3。当w(Al S)≤0.005 4%,钙处理后的夹杂物为CaO-SiO_2-Al_2O_3-MgO,加入铝量越多,夹杂物成分中Al_2O_3的含量越多;w(Al_S)=0.016%时,钙处理后的夹杂物为CaO-Al_2O_3-MgO。     

A study on thermal conductivity of a mixture of magnesia particles and molten nitrate by a transient hot wire method

In this study, the effective thermal conductivity of a mixture of magnesia particles and molten nitrate used in a high temperature thermal energy storage system was investigated by a transient hot wire method. The effective thermal conductivity of the mixture was around 2.0W/(m·K) in the temperature range of 423 K to 703 K, although it decreased about 5% with increasing temperature. This value was about 10 times larger than that of the packed bed of magnesia particles including air. The effective thermal conductivity increased about 3% with a 1% increase in the volume ratio of magnesia particles in the mixture with molten nitrate. © 2006 Wiley Periodicals, Inc. Heat Trans Asian Res, 35(4): 245–253, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20116     

Catalytic hydrotreating of pyro-oil derived from green microalgae spirulina the (Arthrospira) plantensis over NiMo catalysts impregnated over a novel hybrid support

Upgrading of pyrolysis bio-oil by a novel catalytic hydrotreating process, including hydrodeoxygenation (HDO) and hydrodenitrogenation (HDN) was found as an effective technical method for the improvement of biofuel characteristics. In this study, for the first time, the performance of a novel meso-microporous composite material, HMS-ZSM-5, as a support on the catalytic activity of NiMo-based catalysts in the bio-oil hydrotreating was evaluated. The experiments were carried out in a flow fixed-bed reactor at the temperature range of 300–360 °C, 30 bar pressure, and LHSV = 4 h-1. Also, the results were and compared with those of HMS, ZSM-5, and γ-Al2O3 supports. For all catalysts, the increase in temperature resulted in the enhancement of HDO and HDN reactions efficiency. NiMo/HMS-ZSM-5 possessed a high acid property which contributed to the removal of oxygen and nitrogen from bio-oil, with the conversion of 84.10% and 69.60%, respectively. Therefore, the novel catalyst of this study represented much superior upgrading performances compared with those of stand-alone NiMo/HMS and NiMo/ZSM-5 catalysts and also the conventional catalyst of NiMo/γ-Al2O3.     

不同气化剂下海藻粉在气流床下气化特性试验研究

为考察O2/水蒸气和O2/CO2作为气化剂对海藻粉气化特性的影响,在自制的小型生物质气流床气化炉上开展海藻粉在气流床下气化特性试验研究。当氧气/生物质比（O/B）为0.3、气化温度为1200℃时,不同水蒸气/生物质比（S/B=0～1.2）对合成气组成有较大影响,其中H2产量的上升趋势最为明显,S/B=1.2时比单纯氧气气化提高了81.4%。而在O2/CO2气化条件下,由生物质产生的CO2随二氧化碳/生物质比（CO2/B）的增加而下降,当CO2/B=0.9时,H2、CO的产量分别比单纯氧气气化提高了33.9%和75.8%,热值由5521 kJ/m3上升至8576 kJ/m3。结果表明,如果以提高热值为制取合成气的目标时,添加CO2在一定范围内可以达到水蒸气的效果,同时降低了系统能耗及简化了气化设备。