利用工业废渣制备白炭黑研究进展

白炭黑作为许多材料的重要组分,已经得到广泛研究.介绍用工业废渣生产白炭黑的各种制备工艺、特点和应用.用工业废渣生产白炭黑具有良好的应用前景.     

新型金属液面保温材料——炭化稻壳

炭化稻壳是稻米加工后的稻壳经充分炭化处理后的产物,是一种新型的保温材料。国内外广泛用于复盖在金属液面上,能有效减少液态金属的热损失,现广泛采用炭化稻壳复盖连铸中间罐、钢水罐、铁水罐、模铸帽部、有色金属液面和铸钢件帽口上进行保温巳取得显著效果。本文介绍炭化稻壳理化性能及其在冶金生产中的应用。     

气相法白炭黑生产技术的研究

介绍了气相法白炭黑的制备原理与生产工艺,通过解决生产过程中的技术难点及创新点,提高了白炭黑的产品质量,降低了生产成本,促进了资源的循环利用。     

Technology Research on Preparation of Silica White by Manganese Slag

以工业锰浸出渣、氢氧化钠、硫酸为主要原料通过沉淀法制备白炭黑,研究了锰渣与氢氧化钠的配比、氢氧化钠浓度、反应时间、反应温度等因素对白炭黑回收率的影响.获得了制备白炭黑的最佳工艺条件为:反应温度为140℃、氢氧化钠/锰渣的质量比为0.8∶1、反应时间为8h,白炭黑的回收率达到44％.通过红外光谱、TEM等技术表征了白炭黑的结构,粒径为50 nm左右,经测试二氧化硅的含量达到90.5％,达到国家标准.     

新型保温材料—炭化稻壳在连铸生产中的应用效果

对新型保温材料──炭化稻壳的理化指标及其保温性能进行了阐述。在连铸生产中采用炭化稻壳做保温剂可取得显著的经济效益，是理想的保温材料。     

炭化麦杆麦壳混合物保温性能的试验

试验研究炭化麦杆壳混合物在共业生产中的保温性能，结果表明：炭化麦杆麦壳与炭稻壳具有相同的保温性，完全可用来代替炭化稻壳作为金属液面保温剂。     

改性稻壳去除低浓度氨氮的研究

[目的]研究改性稻壳去除废水中低浓度氨氮.[方法]采用单因素试验确定制备改性稻壳吸附剂的条件,得出该吸附剂对氨氮处理的最佳条件.[结果]以10.0 % H2O2作为改性剂,温度100 ℃、时间30 min为稻壳改性的最佳条件;吸附时间120 min,吸附温度23 ℃,pH值8.6,稻壳与水的质量体积比 3.0 g/30 ml时的吸附效果好;同时,改性后的稻壳结构和化学键都发生了变化.[结论]改性稻壳可作为一种低浓度氨氮废水的吸附处理剂,具有一定的利用价值.     

某大型石英岩矿床地质特征及成因探讨

石英岩矿是冶金工业的一种重要原材料,用途广泛,是生产白炭黑的原料矿产。白炭黑主要用于橡胶制品（包括高温硫化硅橡胶）、纺织、造纸、农药、食品添加剂领域。得益于轮胎制造业、硅橡胶产业、涂料工业、新能源等领域的需求增长,预计未来沉淀法白炭黑（Si O2）的年均需求增长幅度约为10%。同时,石英岩矿的用量也会不断增加,因此对大型石英岩矿床的地质特征及成因进行详细的探讨,为其他地区寻找同类矿床具有指导意义。     

红土镍矿资源全回收新工艺及清洁生产分析

对红土镍矿进行高酸浸出,浸出滤液加入硅镁镍矿预中和,预中和滤液加入菱镁矿中和结晶除铁,除铁滤液加入菱镁矿沉镍,沉镍滤液浓缩结晶高纯硫酸镁,高纯硫酸镁生产下游高纯镁产品,除铁渣用于炼铁;浸出渣、预中和渣用于生产白炭黑的工艺.实现红土镍矿资源全回收.     

适合制造钢包和中间包的合适隔热材料

连铸技术的迅速发展要求开发高质量的隔热材料,从1960年以来,德国Reftatechick公司一直致力于开发隔热材料,以炭化稻壳为原料生产合适的保温材料,并用于炼钢厂,作为钢包和中间包的覆盖剂.     

Determination of Silica Activity Index and XRD,SEM and EDS Studies of Amorphous SiO<Subscript>2</Subscript> Extracted from Rice Husk Ash

Rice husk ash (RHA) contains 20% SiO₂ in hydrated amorphous form (Si–OH). On thermal treatment, the SiO₂ converts to cristobalite, the crystalline form which is not reactive. However under controlled conditions, amorphous SiO₂ with high reactivity is produced. Therefore rice husk has been one of the useful bio-mass. The silica activity index was determined to be equal to 97.73 which was used to determine the percentage of amorphous SiO₂ in RHA. The values of the soluble fraction and silica activity index were also stated. Comparative study of amorphous and crystalline SiO₂ done by X-ray diffraction revealed the total amorphous nature of SiO₂. The scanning electron microscopy (SEM) images displayed the comparative morphological features of the rice husk and RHA. The energy dispersive spectroscopy analysis of rice husk was done to determine the presence of SiO₂ on the upper portion of rice husk and to determine the percentage of SiO₂ in RHA. The SiO₂ particles in an agglomerated form was found to be of micron size when observed under SEM.     

炭化麦杆麦壳混合物保温性能试验

试验研究了炭化麦杆壳混合物在工业生产中的保温性能，结果表明：炭化麦杆麦壳与炭化稻壳具有相同的保温性，完全可用来代替炭化稻壳作为金属液面保温剂。     

Influence of La2O3 on preparation and performance of porous cordierite from rice husk

A porous cordierite was synthesized at 1350 ℃ using rice husk as silica source and pore forming agent, and La2O3 as fluxing agent. The crystal phases of the cordierite were analyzed by X-ray diffraction (XRD) and their microstructures were observed by scanning electronic microscopy (SEM). The flexural strength, porosity and thermal expansion coefficient of the porous cordierite samples were inves- tigated in detail. Results showed that when 5 wt.% La2O3 was added, the flexural strength, porosity and thermal...     

生物质气化燃烧蒸汽锅炉研制及应用

针对稻壳成型燃料燃烧特点,研究开发了新型生物质蒸汽锅炉。阐述了此种形式锅炉的基础实验,结构设计及计算要点。实测及运行经验表明,此种锅炉具有洁净燃烧、高效节能、符合环保要求、经久耐用等优点。     

Pyrolysis Kinetics of Rice Husk in Different Oxygen Concentrations

The effects of oxygen on the pyrolysis of rice husk were investigated with a thermal gravimetric analysis (TGA) reaction system. Pyrolysis experiments of rice husk were carried out in N2, 10% O2, and air at the heating rates of 2, 5, and 10?K/min. The TGA curves indicated two principal reactions, distinguished by significant and distinct mass changes over the experimental range. Oxygen enhanced the pyrolysis reactions of intermediates, which was produced from the first stage reaction of rice husk. A simple kinetic model was proposed for the pyrolysis of rice husk in different oxygen concentrations. The corresponding activation energies, preexponential factors, and reaction orders were determined. The experimental results were satisfactorily fitted by the proposed kinetic model.     

新型钢包覆盖剂的研制

为了改善钢包覆盖剂的保温性能,研制出了采用炭化稻壳为主原料的新型钢包覆盖剂。它具有强度好、粉尘少、堆比重轻的特点,兼具钢液保温、防止钢水二次氧化等功能。在工业生产中试用,取得了较好的效果。     

Properties and Performance of Carbonized Corn Straw as Thermal Insulating Agent of Liquid Metal

Owing to the status that the price of thermal insulating agent for liquid metal has been raising constantly in recent years, the present work investigated the properties of carbonized corn straw using as thermal insulating agent of liquid metal. The results showed that the carbonized corn straw possessed higher content of fixed carbon, smaller repose angle (or better flowing property) and lower heat conductivity coefficient compared to carbonized rice husk. Both the laboratory test and practical application of using carbonized corn straw as thermal insulating agent of liquid metal showed that it had a better thermal insulating performance, whereas a bigger collapse ratio and agglomeration were found. Thus, a satisfied application performance of thermal insulating can be achieved by using a mixture of carbonized corn straw and carbonized rice husk. The application of carbonized corn straw as thermal insulating agent of liquid metal not only develops a new effective way to use corn straw, but also contributes to decrease the production cost of metallurgical industries.     

压渣稻壳块的研制和工业试验

用稻壳、锯末、添加剂等为原料,经一系列工艺加工成型的稻壳块,在转炉炼钢中做压渣剂、镇静剂使用,能消除泡沫渣过多引起的溢渣和喷溅。此外,还收到缩短冶炼时间、提高产量、净化钢液等效果,可以推广使用。     

Species identification and molecular characterization of Acanthamoeba isolated from contact lens paraphernalia

Because of recent agricultural policy to suppress rice production, a rather rare situation occurred in one prefecture in Japan that rice and winter wheat were grown in fields neighboring each other, rice being grown from May to October, and wheat from November to June of the next year. Grains of such rice and wheat were analyzed for cadmium (Cd) and lead (Pb) by atomic absorption spectrometry, and eight nutrient minerals by inductively coupled plasma emission spectrometry. Concentrations of nutrient minerals were higher in wheat grains than in unpolished rice grains (without husk), and similar trends were observed also for Cd and Pb. Flour obtained by milling of the wheat grains had significantly less Cd and nutrient minerals than the mother grains, and such reduction was also observed by treatment of unpolished rice to polished grain. Pb concentration was also reduced by the polishing of rice. Pb in wheat flour appeared to be higher than that in whole grain. Comparisons between the final edible forms of the two cereals showed that K and Cu were higher in polished rice than in wheat flour and that such may also be the case for Cd, whereas the reverse was the case for Ca and Fe, and possibly for Pb.