CaO杂质对铝型材厂工业污泥合成堇青石材料晶相结构及其含量影响

探讨原料组成对铝型材厂工业污泥合成堇青石材料的影响是非常重要的。研究目的有助于确定不同杂质在原料中允许的存在量,为选择其他原料提供可靠的依据。采用XRD法和SEM法分析各试样的晶相结构:用半定量分析方法确定各晶相的含量:用philipsX抪ertplus软件确定试样中各晶相结构参数。实验结果表明:CaO杂质含量从1.2~2.5%对合成堇青石有利:从2.5~2.8%堇青石含量开始下降:确定2.5%为CaO杂质最佳存在量,其对应的堇青石含量为91%。经plus软件确定结果:CaO杂质含量为1.2%时,其结构与单晶相同,晶胞参数变化很小:CaO含量从1.2~2.8%,其晶系由六方转变为四方结构,晶胞参数发生较大变化。镁铝尖晶石结构与晶胞参数变化较大,由单晶的立方结构转变为四方结构。

Influence of CaO Impurity on the Crystalline Structure of Cordierite Synthesized from Waste Aluminum Sludge

It is significant to discuss the influence of impurities on the synthesis of cordierite, and it will help us to determine the permitted contents of different impurities in the raw materials, thus the basis for selecting raw materials is established. XRD and SEM techniques were used to analyze the crystalline structure of each specimen. Semi-quantitative software was applied to calculate the content of crystalline phases. Philiphs X抪ert plus software was utilized to characterize the cell parameters of each crystalline phase. The results suggest that the content of CaO from 1.2wt% to 2.5wt% is beneficial to the synthesis of cordierite, but that from 2.5wt% to 2.8wt% will reduce its content. Therefore 2.5wt% of CaO is the best content, and at the same time the amount of cordierite is up to 91%. Plus software analysis shows that when the content of CaO is 1.2wt%, cordierite has the same structure as single crystal and the unit cell parameters change slightly; when it changes from 1.2wt% to 2.8wt%, the cordierite structure turns from hexagonal to tetragonal and the cell parameters are changed greatly. Mg-Al spinel structure changes from cubic to tetragonal, and the unit cell parameters also have great changes.