合成条件对电解锰渣制备水化硅酸钙过程中结构和性能的影响

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.