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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 the influence of calcination temperature, calcination time and the number of vinegar quenching on the phase transformation of natural copper in the process of calcination, and to analyze its phase transformation law. Methods: X-ray diffraction was used to qualitatively and semi-quantitatively analyze the influence of calcination temperature, calcination time and the number of vinegar quenching on the phase transformation of natural copper. Results: The temperature of calcination, the time of calcination and the number of vinegar quenching all had some influence on the phase transformation of natural copper during the processing. The influence of calcination temperature was the greatest. The influence of the number of vinegar quenching on the phase transformation to oxide was greater than the processing time. Natural copper in the calcination process changes in the main phase is Fe S2 decomposition of Fe7S8, to 600 ℃ decomposition of Fe7S8-based mixture of phase at 600 ℃ for 4 h vinegar Qufu 3 times, natural copper will be Oxidation to Fe2O3 as the main phase, the calcination temperature is 800 ℃ natural copper oxidation from Fe7S8 to Fe2O3. Conclusion: The calcination temperature, the time of calcination and the times of vinegar quenching all have different degrees of influence on the phase composition and the change of natural copper, and the phase of natural copper changes regularly in the process of calcination.