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目的:研究自然铜在不同温度和不同时间煅制后其成分的变化规律。方法:用X射线粉末衍射分析法对煅自然铜进行半定量相分析,用重铬酸钾容量法测定其全铁含量。结果:自然铜煅制温度在400～900℃过程中,其物相发生较大变化,由FeS2先转变为铁的硫化物(Fe7S8、FeS),后又转变为铁的氧化物(Fe2O3)。全铁含量由400℃煅制3h的47.10%升高至900℃煅制3h的65.81%;由600℃煅制1h的52.55%升高至600℃煅制4h的62.18%。结论:自然铜在不同温度和不同时间煅制,其物相及铁含量变化较大。
Objective: To study the variation of composition of natural copper after calcination at different temperatures and different times. Methods: The semi-quantitative phase analysis of calcined natural copper was carried out by X-ray powder diffraction and the total iron content was measured by potassium dichromate volumetric method. Results: During the calcination of natural copper at 400-900 ℃, the phase changes greatly from FeS2 to Fe7S8 and FeS, and then to Fe2O3. The total iron content increased from 47.10% at 400 ℃ for 3h to 65.81% at 900 ℃ for 3h, from 52.55% at 600 ℃ for 1h to 62.18% at 600 ℃ for 4h. Conclusion: Natural copper is calcined at different temperatures and different times, and its phase and iron content vary greatly.