精炼废渣中CaS水化浸出的热力学及实验研究  

Thermodynamics and experimental research on leaching of CaS in refining spent slag

作　　者：吕宁宁[1] 崔红兵[2] 苏畅[1] 陈翰林[1] 笪亚玲 温泉[1] 

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243002 [2]北京科技大学冶金与生态学院,北京100083

出　　处：《材料与冶金学报》2017年第2期128-135,共8页Journal of Materials and Metallurgy

基　　金：国家自然科学基金资助项目(51604003);安徽工业大学青年教师科研基金(QZ201502)

摘　　要：若实现精炼废渣的循环利用,须去除其中的有害元素硫,为此,本文首先通过热力学计算绘制了不同条件下CaS-H2O体系的E-pH图,并对CaS水化后各物质的稳定区域进行了分析,之后对CaS进行了水化浸出实验,研究了溶液pH值及温度对硫浸出率的影响,结果表明:随着溶液pH值的增大,Ca元素的存在形式呈Ca^(2+)→CaSO4→Ca(OH)2的变化规律,S元素的存在形式呈HSO_4^-、S→CaSO_4→SO_4^(2-)的变化规律,硫的浸出率呈先降低后升高的趋势,常温下硫的最高浸出率为61%;随着温度的升高,CaSO_4的稳定区域逐渐缩小,Ca^(2+)+HSO_4^-和Ca(OH)_2+SO_4^(2-)的稳定区域不断扩大,硫的浸出率不断升高,373 K时硫的浸出率为71%.In order to remove the harmful element sulphur, the E - pH diagram of CaS - H20 under different conditions was firsdy drawn through thermodynamical calculation, the stability region of each species after hydration of CaS were analyzed, and then the leaching experiments for CaS were carried out. Effects of pH and temperature on the leaching ratio of CaS were studied. The results indicated that with increase of pH, the existing form of Ca element shows a variation trend of Ca^2 ＋→CaSO4→Ca（ OH） 2, the existing form of S element gives a changing tendency of HSO4 、 S→CaSO4→SO4 . The leaching ratio of sulphur first decreases and then increases, the highest leaching ratio at the room temperature is 61% . With increase of temperature, the stability region of CaSO4 gradually shrinks, those of Ca^2＋ ＋ HS0 4 and Ca（OH）2 ＋ SO4^2- gradually enlarge, the leaching ratio of sulphur increases and reaches 7 1% at 373 K.

关 键 词：精炼废渣 CAS E-PH图 浸出 PH值 温度 

分 类 号：TF523[冶金工程—钢铁冶金]