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回转窑焙砂中的硫主要以磁黄铁矿形式存在，在高温及酸性气氛下直接水淬冷却时．磁黄铁矿的结构和性质发生了变化．UTA－TG显示水淬焙砂在230℃有一明显的放热峰和失重，XRD表明水淬焙砂中出现α－S的衍射峰，但经过300℃焙烧后则消失．经250－300℃二次焙烧后金的浸出率显著提高．初步研究结果认为磁黄铁矿受酸作用后表层形成了类似于多硫化物（如等）的缺铁性硫化物．由于多硫化物的键能与α－S接近，因而出现α－S（Ss）衍射峰．多硫化物的硫比较活泼，具有较强的反应活性．230℃的反应峰即为该多硫化物的氧化反应引起．
The sulfur in the rotary kiln calcine is mainly in the form of pyrrhotite, when it is directly water quenched under high temperature and acid atmosphere. The structure and properties of pyrrhotite have changed. UTA-TG shows that water-quenched sands have a pronounced exothermic peak and weight loss at 230 ° C. X-ray diffraction (XRD) shows that the α-S diffraction peaks appear in water-quenched sands, but disappear after roasting at 300 ℃. After the second calcination at 250-300 ℃, the leaching rate of gold increased significantly. Preliminary results suggest that pyrrhotite formed an iron-deficient sulphide similar to polysulphide (eg, etc.) on the surface of the pyrrhotite. Since the polysulfide bond energy is close to α-S, an α-S (Ss) diffraction peak appears. Polysulfide sulfur more lively, with strong reactivity. The reaction peak at 230 ° C is caused by the oxidation reaction of the polysulfide.