(1. 南京工業(yè)大學 安全科學與工程學院，南京211816；
2. 中南大學 化學化工學院，長沙410083；
3. 中南大學 錳資源高效清潔利用湖南省重點實驗室，長沙 410083)
摘 要: 基于電解錳渣成分及水化硅酸鈣(C-S-H)材料的結(jié)構特性，提出以電解錳渣為原料制備C-S-H材料，開發(fā)電解錳渣基C-S-H材料制備新技術。系統(tǒng)研究由電解錳渣制備C-S-H材料過程中反應pH值、反應溫度、晶化時間等因素對合成C-S-H材料的礦相、微觀結(jié)構和溶鈣性能的影響。結(jié)果表明：C-S-H產(chǎn)品的種類、微觀結(jié)構及其溶鈣性能與反應工藝條件緊密相關，在優(yōu)化工藝條件下(反應pH值12.0、反應溫度100 ℃、晶化時間10 h)制備所得的C-S-H材料結(jié)構酥松，其比表面積為205.0 m2/g，總孔孔容為0.68 cm3/g，且溶鈣能力最強，溶出鈣離子濃度為11.52 mg/L，適合作為吸附除磷材料在水處理過程中使用。
關鍵字: 電解錳渣；水化硅酸鈣；合成條件；微觀結(jié)構；溶鈣性能
（1. College of safety Science and Engineering, Nanjing Technology University, Nanjing 211816, China;
2. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
3. Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, China）
Abstract:Based on the composition of electrolytic manganese residue (EMR) and the structural characteristics of hydrated calcium silicate (C-S-H) material, a novel technology was used for EMR based C-S-H material preparation using EMR as raw material. Calcium silicate hydrate (C-S-H) was synthesized from electrolytic manganese residue (EMR) via a hydrothermal synthetic procedure. The major factors influencing the crystalline phase, microstructure and Ca2+ release capacity of C-S-H were investigated in the aspects of reaction pH value, reaction temperature and crystallization time. The results show that the crystalline phase, microstructure and Ca2+ release capacity of C-S-H are greatly affected by the reaction pH value, reaction temperature and crystallization time during the preparation process. And the optimal condition for C-S-H synthesized from electrolytic manganese residue is determined to reaction pH value of 12.0, reaction temperature of 100 ℃ and crystallization time of 10 h. And the product synthesized under the optimal condition is identified to be a calcium silicate hydrate with a specific surface area and pore volume of 205 m2/g and 0.68 cm3/g, respectively. Meanwhile, under the above conditions, Ca2+ release capacity is 11.52 mg/L, making this material a promising candidate for removal of phosphate ions diluted in wastewater.
Key words: electrolytic manganese residue; calcium silicate hydrate; synthesis condition; microstructure; Ca2+ release capacity
