低水分抗热震高铝可塑料在加热炉上的应用

用矾土作为主原料,选择适当结合剂和添加剂,引入微粉技术,采用真空炼泥等工艺手段,研制成低水分抗热震高铝可塑料。该制品用作热媒加热炉衬里,显示出良好的耐高温和耐热冲击性能。     

High Temperature Property Development of Bauxite Based Bricks

Physical properties and microstructural evolution on firing of 3 types of bauxite based refractory bricks were carried out using techniques such as porosimetry,XRD and SEM.The groups differed from each other by progressive refining of the matrix or bond phase.It is revealed that such a refinement of the matrix can improve the high temperature properties of the bricks made from poor grade materials.     

耐磨层衬里表面疏松脱皮问题的解决方法

用国产材料做重油催化裂化再生器和反应器的耐磨衬里,其表面容易产生疏松脱皮问题。经过分析、实验,认为主要是碱性物质对衬里起破坏作用,并提出了除碱方法,保证了衬里质量。     

Cr_2O_3对矾土－尖晶石耐火材料抗渣性的影响

以高铝矾土及预合成电熔ＭＡ砂为原料，制各了矾土－尖晶石耐火材料。对其加入铬精矿后的抗渣性进行了试验。结果表明，少量铬精矿的加入能形成尖晶石固溶体，提高制品的抗渣性能。     

CeO2 和MgO助烧剂对矾土基莫来石合成料烧结的影响

以高铝矾土碎矿(w(Al2O3)为75%~84%)和煤矸石(w(Al2O3)约45%)为原料,按矾土基莫来石合成料的设计成分要求(w(Al2O3)为68%~72%)进行配比,于1500~1700℃分别保温3h煅烧合成了矾土基莫来石,并分别研究了助烧剂CeO2和MgO单独加入,CeO2 MgO复合加入,复合加入时CeO2与MgO的比例以及复合加入量对矾土基莫来石合成料烧结性能的影响。结果表明:加入CeO2 MgO复合助烧剂比单独加入CeO2或MgO的促烧结效果要好,当CeO2 MgO外加量为0.75%,CeO2与MgO质量比为1/1时,可使试样的烧结温度降至1600℃(不加助烧剂的为1700℃),得到显气孔率0.9%,体积密度为2.84g·cm-3,荷重软化开始温度为1570℃的合成莫来石;显微结构分析表明,此合成料荷重软化温度较高的原因是发育良好的柱状莫来石构成了交错连锁的网络结构,同时TiO2大部分固溶在莫来石晶体中。     

Desilication from illite by thermochemical activation

Illite occurs widely in bauxite ores and results in low alumina grade of the ores. Differential thermal analysis (DTA), thermal gravimetric analysis (TGA) and X-ray diffraction analysis (XRD) show the OH groups split off from the structural framework of illite between 500 ℃ and 700 ℃. With the increase in temperature up to about 1 100 ℃, the layer structure of illite breaks up and Si in the layers is transformed into the amorphous state. Meanwhile, mullite comes out at 1 100 ℃. Quartz occurring in illite keeps unchanged in structure in the range of 500 -1 200 ℃. A desilication process from illite by thermochemical activation followed by alkali leaching is therefore developed on the basis of the behavior that amorphous silica is alkali soluble. The investigation finds that the optimum parameters for desilication are activation temperature of 1 100 - 1 150 ℃, activation time of 90 - 120 min, leaching temperature of 95 - 110 ℃, leaching time of 90 - 120 min and concentration of caustic soda (Na2Ok) 120 - 150 g/L. An overall desilication about 45% is attained under these conditions. XRD analysis confirms that the active amorphous SiO2 has been dissolved in the alkali solution and removed from the samples, while quartz and mullite have not. The investigation also shows that the formation of mullite during activation and formation of sodium hydroalu minosilicates (Na96 Al96 Si96 O384 and 0.95Na2 O · Al2 O3 · 3.25SiO2 · 4.79 H2 O) during leaching lead to the relatively low desilication of illite.     

中铝瓷球的应用研究

本文以长石、粘土、矾土等天然矿物原料,采用可塑法成型工艺,研究了配方与烧结温度、瓷球密度、外观颜色的关系,研制成功了成本低、密度大、外观质量较好的中铝瓷球的较佳配方,并解决了瓷球生产中的关键工艺技术问题。