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Ca2+→CaSO4→Ca(OH)2的变化规律,S元素的存在形式呈HSO-4、S→CaSO4→SO2-4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,CaSO4的稳定区域逐渐缩小,Ca2++HSO-4和Ca(OH)2+SO2-4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-H2O under different conditions was firstly 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 Ca2+→CaSO4→Ca(OH)2, the existing form of S element gives a changing tendency of HSO-4、S→CaSO4→SO2-4.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 Ca2++HSO-4 and Ca(OH)2+SO2-4 gradually enlarge, the leaching ratio of sulphur increases and reaches 71% at 373 K.
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