锆英石原位合成氧化锆——莫来石复相材料的研究

通过锆英石与α-Al2O3、γ-Al2O3和Al（OH）3之间的原位反应制备了氧化锆—莫来石复相材料,采用XRD、SEM和EDS等手段研究了合成温度、铝源种类对氧化锆—莫来石复相材料物相组成、显微形貌和性能的影响,探讨了锆英石和不同铝源之间原位反应合成氧化锆—莫来石复相材料的烧结机制。结果表明：原位反应合成氧化锆—莫来石复相材料的优化反应温度为1 600℃,优化氧化铝源为α-Al2O3,可获得高致密度的氧化锆—莫来石复相材料。     

莫来石——钛酸铝复相材料的研究

本文研究了添加剂对钛酸铝的稳定作用，采用天然矿物原料合成了具有高稳定性的钛酸铝－莫来石熟料；利用该料与烧结莫来石复合，研制出了性能良好的窑具材料分析了钛酸铝含量和分散度对莫来石－钛酸铝复相材料性能的影响。     

莫来石─钛酸铝复相材料的研究

本文研究了添加剂对钛酸铝的稳定作用，采用天然矿物原料合成了具有高稳定性的钛酸铝-莫来石熟料；利用该熟料与烧结莫来石复合，研制出了性能良好的窑具材料，分析了钛酸铝含量和分散度对莫来石-钛酸铝复相材料性能的影响。     

莫来石前驱体化学制备方法研究进展

莫来石是工业陶瓷的一个主要品种。由于莫来石中铝硅离子扩散困难,晶格位错滑移阻力大,使莫来石瓷较难烧结。为了制备高性能的莫来石,传统方法是用氧化铝和二氧化硅混合在2000℃以上电炉中熔融,将熔体倒入铸模冷却到室温制得“熔融莫来石”;或将粉碎过的原料混合在1700℃烧结制得“烧结莫来石”。近年来,为了     

褐煤粉煤灰制备含铝托贝莫来石保温材料的研究

以含铝硅酸盐褐煤粉煤灰为原料,通过水热法制备含铝托贝莫来石保温材料,对其物理性能、热性能和憎水改性进行了研究,结果表明,密度随着钙硅比(C/S)增大呈先减小后增大的趋势,C/S为0.9时,密度为360.08 kg/m~3,抗压强度为1.72 MPa。含铝托贝莫来石具有良好的化学稳定性,分解温度为800℃,1000℃时晶须烧结缩短扭曲形成2M型硅灰石。防水剂掺量0.7%,烘干温度60℃,浸渍法与拌合法使得含铝托贝莫来石中硅羟基与甲基硅酸钠结合形成憎水网状有机硅树脂膜,取得良好憎水效果,并且浸渍法操作更加简单。     

煤矸石及铝型材厂污泥合成莫来石的试验研究

本文以龙岩地区煤矸石和铝型材厂污泥为原料,根据不同配比制样并烧成莫来石,用XRD和SEM表征试样的晶相结构和显微结构,结果表明:在1450℃下可以合成较高含量的莫来石,Al2O3/SiO2为2.83时稳定态莫来石含量最高,达到58.6%,总莫来石含量达到71.6%。     

高强度陶瓷烧结体的制造方法

使用由喷雾热分解法合成的高纯度的莫来石粉末能够制得高强度的陶瓷烧结体。其制造方法如下;将硝酸铝、氯化铝等的铝盐和用Si_nO_(n-1)(OR)_(2n+2)(n≥1,R:烃基)表示的硅烃基氧化物加水或在水中溶化后,用这种溶液经     

陶瓷烧结垫板

一种以结晶质的氧化铝纤维为基体的陶瓷烧结垫板由日本最主要的石棉制造商Nichias公司制成,称为Rubiel垫板。可用作烧结电子元件的垫板。它能够承受1700℃的高温而重量只有传统的以莫来石或氧化锆为基材的垫板的1/3—1/6,从而降低了烧成过程中的能耗,     

锆英石在玻璃制造业中的应用

一、耐火材料在玻璃制造业的应用 在玻璃业,使用锆英石(zircon)和氧化锆(zirconia)的耐火材料一般分为3个类型:烧结锆英石产品、烧结锆英石-莫来石产品和电熔浇注氧化铝-氧化锆-氧化硅(AZS)产品。 1.烧结氧化锆耐火材料 其以熟料(研磨锆石、烧结和破碎)、原砂、烧结添加剂(二氧化     

Al粉添加对莫来石结合刚玉材料性能和结构的影响

莫来石或莫来石结合刚玉耐火材料在高温工业中被广泛用作高温结构材料,特别在高温(>1350℃)耐火窑具领域占有主导地位,是现代电子陶瓷生产主要选用的高档窑具材料。莫来石结合刚玉耐火材料性能的优劣关键取决于莫来石基质或莫来石结合相。采用以Al2O3微粉和SiO2微粉为主要基质料,添加不同金属Al粉反应烧结(RBM)莫来石结合相,研究不同Al粉添加在不同温度下烧成莫来石结合刚玉材料的显微结构及力学性能。结果表明:Al粉添加促进了莫来石的生成,改变了莫来石的结晶形态,提高了莫来石结合刚玉耐火材料的高温力学性能。     

祁东煤系高岭土大型工业应用试验研究

祁东煤系硬质高岭土矿物组成简单,高岭土含量在90％以上,有害矿物以菱铁矿为主。在雪纳公司生产线上进行11d连续性工业生产试验,共处理500余t矿石,获得了较好的技术指标：产能33t／d,白度91．5％,粒度-2μm为91％。     

淮北煤系高岭土补强天然橡胶试验研究

以表面改性的超细高岭土粉体（平均粒径1．54μm）为原料,研究其对天然橡胶的补强作用。通过不同种类偶联剂及高岭土填充量等试验研究表明,对于此淮北高岭土,适宜的偶联剂是钛酸酯;在填充量相同前提下,煅烧土对天然橡胶的补强效果优于未煅烧土;SEM分析可知,粉体粒度越细,补强效果越好。     

基于响应面法的赤泥烧结砖烧结工艺参数优化

以赤泥、淤泥和高岭土为主要原料制备烧结砖,研究烧结温度、保温时间、坯料粒度3个工艺参数对赤泥烧结砖吸水率的影响。利用响应面法(RSM)建立了3个工艺参数与吸水率之间的数学模型并对统计数据进行了方差分析。结果表明,最佳烧结工艺参数为:烧结温度1180℃、保温时间32 min、颗粒度125μm,样品吸水率为14.9%,与预测值相差4%,测试结果与数学模型拟合度较高,该模型能够较好的预测赤泥烧结砖的吸水率。     

Ultimate bearing capacity of strip footing resting on clay soil mixed with tire-derived aggregates

This study investigated the use of recycled tire-derived aggregate (TDA) mixed with kaolin as a method of increasing the ultimate bearing capacity ( UBC) of a strip footing. Thirteen 1g physical modeling tests were prepared in a rigid box of 0.6 m × 0.9 m in plan and 0.6 m in height. During sample preparation, 0%, 20%, 40%, or 60% (by weight) of powdery, shredded, small-sized granular (G 1–4 mm) or large-sized granular (G 5–8 mm) TDA was mixed with the kaolin. A strip footing was then placed on the stabilized kaolin and was caused to fail under stress-controlled conditions to determine the UBC. A rigorous 3D finite element analysis was developed in Optum G-3 to determine the UBC values based on the experimental test results. The experimental results showed that, except for the 20% powdery TDA, the TDA showed an increase in the UBC of the strip footing. When kaolin mixed with 20% G (5–8 mm), the UBC showed a threefold increase over that for the unreinforced case. The test with 20% G (1–4 mm) recorded the highest subgrade modulus. It was observed that the UBC calculated using finite element modeling overestimated the experimental UBC by an average of 9%.     

伊川半坡煤系高岭土矿床地质特征及找矿方向

伊川半坡煤系高岭土矿床的赋矿层位为二叠系石盒子组下段,矿石质优,规模可达中型（〉200万t）。成矿受古地理沼泽—泻湖盆地控制,找矿前景较好。     

过氧化氢预氧化复合高岭土去除水中颤藻的研究

研究了H2O2预氧化复合高岭土混凝工艺对水中颤藻的去除效果。结果表明,H2O2具有显著氧化抑制藻活性的功能,高岭土则具有良好的助凝作用,经H2O2预氧化复合高岭土混凝后形成的絮体大而密实,沉降速度更快。试验得出最佳复配条件为:原水pH值为7,预氧化时间为20 min,H2O2、高岭土和PAC的投加量分别为3,34和3.5 mg/L。在该最佳试验条件下,浊度和叶绿素a去除率分别达到95.6%和97.8%,残留铝含量为0.13 mg/L。     

高岭土负载氧化锌／氧化钛制备光催化功能材料的研究

以硫酸钛、硫酸锌、高岭土、尿素、无水乙醇等为原料,水热法制备了氧化锌／氧化钛复合纳米粉体以及高岭土负载纳米氧化锌／氧化钛复合粉体;利用X-射线衍射（XRD）对所得粉体进行了表征,研究了不同粉体对甲基橙溶液的光催化降解效果,制备出了光催化性能良好的高岭土负载纳米氧化锌／氧化钛复合粉体。     

Adsorption characteristics of clay adsorbents – sepiolite,kaolin and synthetic talc – for removal of Reactive Yellow 138:1

Adsorption characteristics of three clay adsorbents – sepiolite, kaolin and synthetic talc – were investigated to determine their applicability to remove an anionic reactive dye – Reactive Yellow 138:1 – from a water stream. Results showed that synthetic talc had the highest maximum monolayer adsorption capacity of 10.07 mg/g, followed by kaolin (3.73 mg/g) and sepiolite (3.23 mg/g), for the removal of Reactive Yellow 138:1. Synthetic talc and sepiolite removed dyes from aqueous solutions mainly through physical adsorption depending on the surface area. By contrast, the adsorption mechanism of kaolin was strongly influenced by the anion exchange mechanism. Zeta potential analysis revealed that the adsorption capacity of clay adsorbents increased under acidic rather than alkaline conditions, owing to protonation of the clay surface. Moreover, synthetic talc was successfully regenerated by heating at more than 400°C, effectively restoring its original adsorption capacity.     

Adsorption of p-chlorophenol by biofilm components

Through batch equilibrium experiments under the conditions of temperature 25 degrees C, pH values of 2.7, 5.3 and 6.1, the p-chlorophenol (4-cp) adsorption to biofilm components was investigated in this study. The contributions of biofilm components to 4-cp adsorption were discussed by comparing four adsorption systems, i.e. 4-cp adsorbed by model suspended particulate matter (kaolin) with biofilm coating, bacteria, bacterial exopolysaccharide (EPS) and kaolin, respectively. Langmuir and Freundlich isotherm equations were used to evaluate the experiment data. All the four adsorptions fitted for the two equations. Equilibrium isotherms were obtained for 4-cp adsorption on different adsorbents. The kinetic characteristics of 4-cp adsorption by biofilm components and the effect of pH on the kinetic process were investigated. The time to reach the highest adsorption amount and near equilibrium state in the four systems was different. The 4-cp adsorption by kaolin with biofilm coating reached near equilibrium at 60 min at pH 6.1. The 4-cp adsorption by EPS and kaolin reached near equilibrium at 150 and 180 min, respectively. But the 4-cp adsorption by bacteria showed no evident near equilibrium during 3 h in the experiment. The impact of pH value on the adsorption was also examined. The adsorption amount slightly increased with increasing pH from 2.7 to 6.1 for the adsorption systems of bacterial EPS and kaolin, but it slightly decreased in the systems of kaolin with biofilm coating and bacteria.