气淬法制备高炉渣玻璃微珠的性能

通过实验分别检测了高炉渣珠的堆积密度、粒度分布、化学侵蚀性、筒压强度和表观特性.结果表明,堆积密度随粒径的增加先增加后减小,0.3~1mm粒径范围内渣珠堆积密度最大,并且渣珠粒径主要集中在0.30~1.0mm之间,成珠率较高;渣珠不耐酸,在同一侵蚀溶液中,粒径较大的渣珠的抗侵蚀能力强于粒径较小的渣珠;粒径越小,渣珠筒压强度越大,渣珠承受压力的能力越强;高炉渣珠表面光滑平整,呈圆球状,粒径大小均匀;由于渣珠气淬的冷却速率较快,渣珠非晶相含量较高,当渣珠粒径<0.30mm时,XRD曲线变为馒头峰,基本不再有晶相析出,矿相变为非晶相.     

高铝粉煤灰拜耳法溶出渣碱回收

针对高铝粉煤灰拜耳法溶出渣进行了脱碱工艺研究,考察了［n(C)/n(S)］(CaO与SiO₂物质的量比)、反应温度、反应时间、液固比及体系碱浓度等对脱碱的影响,同时考察了脱碱过程对氧化铝溶出率的影响.结果表明:添加石灰的方式可以实现高铝粉煤灰拜耳法溶出渣中氧化钠的脱除,并回收部分氧化铝;反应温度对氧化钠和氧化铝回收率均造成显著影响,而［n(C)/n(S)］仅对氧化钠的溶出率影响较大;在温度260℃、氧化钠质量浓度小于80g/L、液固比4、［n(C)/n(S)］为1.8、反应时间2h条件下,脱碱率为91.2%,氧化铝回收率为28.0%;拜耳渣脱碱过程物相由水合铝硅酸钠向水化石榴石及铁水化石榴石转变.     

酸溶性钛渣的干燥特性及其影响因素

以氯化法生产钛白粉的主要原料酸溶性钛渣中的水分为研究对象,对酸溶性钛渣的常规干燥特性及影响因素进行了研究。通过研究酸溶性钛渣在温度变化、样品质量变化、以及初始含水量变化的条件下,获得干燥过程中的水分迁移行为,从而揭示酸溶性钛渣干燥过程的基本规律,探明酸溶性钛渣内部的传质机理。通过实验研究和理论探讨,为干燥冶金、化工原料的工业化应用和推广提供实验依据和理论基础。     

冻融循环下掺锂渣再生混凝土损伤试验

针对冻融损伤分析再生粗骨料取代率和锂渣掺量对混凝土质量、动弹性模量以及抗压强度的影响。试验结果表明:过多使用再生粗骨料不利于抗冻性的提高;适量添加锂渣可以有助减轻冻融循环给混凝土带来质量损失的影响,且随着掺入量的增加,抗冻性能呈现先提高后降低的趋势,当掺量为20%时,抗冻性能达到最优。由试验数据拟合得到用再生粗骨料取代率以及锂渣掺量两因素的混凝土冻融后抗压强度劣化方程。     

低温低碱度脱磷渣中磷的富集行为

At low basicity and low temperature, the dephosphorization behavior and phosphorus distribution ratio (L_P) between slag and molten steel in the double slag and remaining slag process were studied with a 180 t basic oxygen furnace industrial experiment. The dephosphorization slags with different basicities were quantitatively analyzed. At the lower basicity range of 0.9–2.59, both L_P and dephosphorization ratio were increased as the basicity of dephosphorization slag increased. Dephosphorization slag consisted of dark gray P-rich, light gray liquid slag, and white Fe-rich phases. With increasing basicity, not only did the morphologies of different phases in the dephosphorization slag change greatly, but the area fractions and P₂O₅ content of the P-rich phase also increased. The transfer route of P during dephosphorization can be deduced as hot metal → liquid slag phase + Fe-rich phase → P-rich phase.     

Dynamic mass variation and multiphase interaction among steel,slag, lining refractory and nonmetallic inclusions: Laboratory experiments and mathematical prediction

The mass transfer among the multiphase interactions among the steel, slag, lining refractory, and nonmetallic inclusions during the refining process of a bearing steel was studied using laboratory experiments and numerical kinetic prediction. Experiments on the system with and without the slag phase were carried out to evaluate the influence of the refractory and the slag on the mass transfer. A mathematical model coupled the ion and molecule coexistence theory, coupled-reaction model, and the surface renewal theory was established to predict the dy-namic mass transfer and composition transformation of the steel, the slag, and nonmetallic inclusions in the steel. During the refining process, Al2O3 inclusions transformed into MgO inclusions owing to the mass transfer of [Mg] at the steel/refractory interface and (MgO) at the slag/re-fractory interface. Most of the aluminum involved in the transport entered the slag and a small part of the aluminum transferred to lining re-fractory, forming the Al2O3 or MgO·Al2O3. The slag had a significant acceleration effect on the mass transfer. The mass transfer rate (or the re-action rate) of the system with the slag was approximately 5 times larger than that of the system without the slag. In the first 20 min of the re-fining, rates of magnesium mass transfer at the steel/inclusion interface, steel/refractory interface, and steel/slag interface were x, 1.1x, and 2.2x, respectively. The composition transformation of inclusions and the mass transfer of magnesium and aluminum in the steel were predicted with an acceptable accuracy using the established kinetic model.     

活化铜矿渣的组成及胶凝特性的研究

本文应用IR、XRD、DTA、OM、SEM、EDXA及化学分析等实验手段,研究了增钙活化铜矿渣的组成和铜矿渣的活化工艺参数,并探讨了含活化铜矿渣水泥的物理力学性能及胶凝特性。     

基质组成对MgO-Al2O3质浇注料性能的影响

研究基质组成对MgO-Al2O3质浇注料热震稳定性和抗渣性能的影响.结果表明,随着α-Al2O3含量的增加,MgO-Al2O3质浇注料1600℃×3 h抗折强度逐渐降低,α-Al2O3质量分数大于15%后抗折强度明显增大;α-Al2O3加入量为10%～15%时浇注料具有最佳的热震稳定性;随着α-Al2O3含量的增加,浇注料渗透指数明显减小,侵蚀指数逐渐增大.MgO-Al2O3质浇注料的性能主要与基质的组成和显微结构相关.     

硅钙渣作为水泥原料的研究

本文对硅钙渣作为水泥原料的应用进行了研究.结果表明,在实验室条件下采用90%左右的硅钙渣和10%左右的石灰石两种原料配料,在1350～1400℃下煅烧,可以生产性能合格的625号硅酸盐水泥.硅钙渣主要矿物是r-C_2S,与通常粘土配料的熟料形成热比较,采用硅钙渣配料,约可降低熟料形成热6.3×10~5～8.4×10~5J/kg;与同类型生产方式比较,约可节省能耗20%左右.同时,生产1t熟料可利用400～500kg的粉煤灰.     

从沸腾炉渣中浸取有价金属

研究了从钢厂炉渣中回收有用金属的一种新方法。实验中，炉渣用硫酸浸取，浸取液采用EDTA络合滴定分析元素组成，颗粒粒径分布采用标准筛筛分，化学组成和微观结构分别采用XRF。结果表明，铝的最大提取率为86．20％，条件为：H2SO4浓度4mol·L^-1、固液比1：5条件下在80℃浸取24h。在同一条件下铁获得最大提取率为94．3％。