摘要
研究了水杨酸-甲醇(SAM)溶液萃取钢渣中硅酸盐相的可行性,分析了钢渣比表面积、溶解时间和水杨酸浓度对萃取硅酸盐相量的影响,利用XRF和XRD分别测定了萃取后残渣的化学组成和矿物成分,以判别SAM溶液萃取硅酸盐相的效果。结果表明:常温下,5g比表面积为600m2/kg的钢渣,经300mLSAM溶液(水杨酸浓度为0.2g/mL)萃取3h,钢渣中的硅酸盐相可完全溶解,其他矿物不溶或溶解甚微。分析指出,硅酸盐相溶解于SAM溶液的原因是由于水杨酸电离出的配体(HO-C6H4-COO-)与矿物表面阳离子(Ca2+)生成的络合物,通过键极化作用削弱Si-O键的稳定性,从而降低了硅酸盐溶解活化能。
The possibility of extracting silicate phase from steel slag by SAM was studied, and the effect of specific surface area of steel slag, dissolving period of samples, concentration of salicyclic acid on the extraction mass of silicate phase were analyzed, then the chemical and mineral composition of extracted residue were studied by XRF and XRD. The results show that, with the extraction for 3h at ordinary temperature, the silicate phase in 5g steel slag （600m^2/kg） can be totally extracted out, and only silicate phase was dissolved in SAM. It is in point that silicate phase extraction is due to forming the complex from the reaction between ligand （HO-C6H4-COO^-）of salicyclic acid with Ca^2＋ on the surface of mineral, which weakens the stability of Si-O bond ,then decreases the activation energy of silicate phase.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2008年第2期365-369,380,共6页
Bulletin of the Chinese Ceramic Society
基金
江苏省高校自然科学重大基础研究项目(06KJA43009)
江苏省生态环境材料重点实验室开放基金项目(XKY2006018)
关键词
水杨酸
转炉钢渣
硅酸盐
萃取
salicyclic acid
converter slag
silicate
extraction
