(1. 昆明理工大学 省部共建复杂有色金属资源清洁利用国家重点实验室，昆明 650093；
2. 昆明理工大学 冶金与能源工程学院，昆明 650093)
摘 要: 在分析高钙钢渣组成结构和浸出特性的基础上，开展高钙钢渣在溶液中除砷行为和机理。研究结果表明：高钙钢渣的主要成分为铁酸钙、硅酸二钙、硅酸三钙，其浸出液pH值为12.15，具有很强的碱性；随着钢渣粒径的变小或钢渣用量的增加，溶液中砷的去除率逐渐上升。钢渣粒径在48~75 μm时，对溶液中的As(Ⅲ)和As(Ⅴ)的去除量分别达到0.90 mg/g和0.93 mg/g；pH对钢渣的除砷率影响较小，经过反应后，对砷的固定率达到99%；高钙钢渣去除溶液中的砷离子受化学反应速率控制。当高钙钢渣与含砷溶液接触时，可对砷离子同时进行吸附和化学沉淀反应，形成较为稳定的钙和铁的砷酸盐和亚砷酸盐，实现溶液中砷离子的稳定化。含砷产物中砷的浸出毒性低于《危险废物鉴别标准GB 5085.3—2007》中规定的5 mg/L，产物属于一般固体废弃物。高钙钢渣适用于含砷酸性废水的无害化处置。
关键字: 高钙钢渣；除砷；吸附
（1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China;
2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:Based on the analysis of the composition and leaching characteristics of high-calcium steel slag, the research on the removal of arsenic from the solution using high-calcium steel slag was carried out, and the arsenic removal mechanism was also explored. The high-calcium steel slag is composed of calcium ferrite, dicalcium silicate and tricalcium silicate following with pH value of 12.15 in the leaching corrosion test, revealing strong alkalinity. With the decrease of slag particle size or the increase of slag dosage, the arsenic removal rate increases gradually. When the particle size of steel slag is in the range of 48-75 μm, the removal amounts of As(Ⅲ) and As(Ⅴ) in the solution reach 0.90 mg/g and 0.93 mg/g, respectively. The pH value has slight influence on the arsenic removal rate. The arsenic fixation rate reaches 99% for arsenic-enriched steel slag after reaction. It is found that the arsenic removal in the solution using high-calcium steel slag is controlled by the chemical reaction rate. When high-calcium steel slag contacts with arsenic-containing solution, arsenic ions can be adsorbed and precipitated simultaneously to form relatively stable arsenates and arsenites of calcium and iron for the removal and stabilization of arsenic ions in the solution. The leaching toxicity of arsenic in arsenic-containing steel slag is lower than 5 mg/L, specified in the “identification standard for hazardous wastes GB 5085.3—2007”, and the products are general solid wastes. The high-calcium steel slag is suitable for the harmless disposal of arsenic-containing acid wastewater.
Key words: high calcium steel slag; arsenic removal; adsorption
