自然铜煅制过程物相动态变化规律

Dynamic Phase Variation Rule of Pyritum During Calcining Process

目的:探讨自然铜在煅制过程中煅制温度、煅制时间及醋淬次数对物相变化的影响,分析其物相变化规律。方法:采用X射线衍射法定性和半定量分析煅制温度、煅制时间及醋淬次数对自然铜物相变化的影响。结果:煅制温度、煅制时间及醋淬次数对自然铜炮制过程中物相变化均有一定影响,以煅制温度的影响最大,醋淬次数对于物相转化为氧化物影响大于炮制时间。自然铜在煅制过程中主要物相变化规律是Fe S2先分解为Fe7S8,至600℃分解为以Fe7S8为主的混合物相,在600℃下煅制4 h醋淬3次,自然铜将被氧化成以Fe2O3为主要物相,煅制温度为800℃时自然铜从Fe7S8氧化为Fe2O3。结论:煅制温度、煅制时间及醋淬次数对自然铜的物相组成和变化均存在不同程度影响,且自然铜在煅制过程中物相呈规律性变化。

Objective： To investigate influence of calcining temperature, calcining time and vinegarquenching times on phase transformation of Pyritum and clarify variation rule and processing mechanism. Method： X-ray diffraction was adopted to qualitative and quantitative evaluate phase composition of different Pyritum sample. Result： Calcining temperature, calcining time and vinegar-quenching times all had a certain impacts on phase transformation in processing process of Pyritum, but processing temperature showed the most obvious effect, then quenching times affected phase transformation of Fe2O3 more obvious than processing time. Phase transformation rule of Pyritum was decomposed from FeS2 to Fe7Ssat first, the main phase of samples that processed under 600℃ was Fe7Ss , whereas the main phase of Pyritum that processed under 600℃ calcined for 4 hours and qunched 3 times was Fe2O3. Along with calcining temperature rised to 800℃ , the phase was mainly oxidized from Fe7S8 to Fe2O3. Conclusion： Calcining temperature, calcining time and quenching times all have different level of effect on phase composition of Pyritum, and the phase transformation observes some rules.