硅酸盐学报

用ＴＧ－ＤＴＡ，ＩＲ，ＸＲＤ和ＮＭＲ等方法对ＡＬＣ（压蒸轻质硅酸盐板材）废渣中添加氢氧化钙后的ＡＬＣ－ＣＨ混合系统，在室温至１０００℃范围内加热过程中的物理化学变化进行了测定分析．结果表明，该系统在加热过程中β－Ｃ２Ｓ于６００—７００℃之间开始形成，８５０—１０００℃之间大量形成，说明可以通过添加Ｃａ（ＯＨ）２后再直接加热处理的方法使ＡＬＣ渣活化．在加热过程中ＡＬＣ中的硅酸盐阴离子首先经历Ｓｉ—Ｏ键的断裂和结构的解离，即具Ｑ３结构的硅酸盐阴离子转变成具Ｑ１和Ｑ２结构的硅酸盐阴离子，进而由Ｑ１和Ｑ２再转变成Ｑ０．根据初始Ｃ／Ｓ比的不同，Ｑ０也可以转变成Ｑ１和Ｑ２．另外，５００—７００℃之间系统中存在着一个未知的过渡相．它是一种带有不同量Ｈ＋和具有Ｑ１和Ｑ２结构特征的硅酸盐阴离子按不同数量比例组合而成的集合体，即该未知过渡相中的硅酸盐阴离子具有单链结构

The physicochemical changes in ALC-CH mixture system in the heating process between 100 to 1000℃ were traced by means of TG-DTA, XRD, IR and NMR analyses. The results show that β-C2S begins to form between 600 and 700℃, and continues to form in a large amount between 850 and 1000℃, indicating that ALC waste can be activated by adding Ca(OH)2 and heating. The breaking of Si-O bond and the dissociation of structure of the silicate anion occurs in the heating. Silicate anions with Q3 sturcture transform into those with Q1 and Q2 structure. Further, those with Q1 and Q2 transform again into Q0. On the other hand, Q0 can also transform into Q1 and Q2, depending on the bulk C/S molar ratio of the system. In addition, it is found that there exists an undefined intermediate phase between 500 and 700℃, NMR analysis shows that this phase is an aggregation of silicate anions with low degree of polymerization (Q1 and Q2), probably combined with different amounts of H+.