粒化高炉矿渣中玻璃体含量测试的影响因素探讨

Study on influencing factors on test of noncrystal material content in GGBS

利用衍射仪探讨了粒化高炉矿渣颗粒细度及衍射仪扫描速度、步长和功率等设备因素对矿渣中玻璃体含量测试结果的影响。结果表明,颗粒越细,扫描速度越慢,步长越长,功率越大,衍射强度越强,即玻璃体对应的峰包越高;但步长过大,会因曲线过于平滑反而使测试结果偏高;设备因素较颗粒细度对衍射强度的影响更为显著,因此即使矿渣很粗,只要提高功率、降低扫描速度,也能获得较准确结果。根据上述试验结果,适宜的测试参数应为大功率、慢扫描速度、适当步长,而矿渣细度为选择性条件,但应优先选用细矿渣。基于这一原则,本试验条件中的最佳测试参数为:比表面积585m2/kg;功率10kW;扫描速度1(°)/min;扫描步长0.02°。

The effect of particle size of GGBS and instrument parameters such as scanning speed, scanning increment and diffraetometer power on the test results of noncrystal material content of GGBS was investigated with high power diffractometer. The results showed that the stronger hump peaks related to nonerystal material content in GGBS were observed when XRD patterns of fine GGBS powder were collected on diffractometer with higher power, slower scanning speed and larger scanning increment. However, the excessive scanning increment would lead XRD patterns to become smoother and thus results showed a higher noncrystal material content than normal. Compared to the particle size of GGBS powder, the effect of instrument parameters on noncrystal material test result was more significant. The accurate nonerystal material content could easily get when using high power and slow scanning speed, even if the particle size of GGBS was lager as hundreds of micrometers. According to above experimental results, high specific surface area, high power, slow scanning speed and suitable scanning increment were proposed to assure the accuracy of the measurement. On the basis of above principles, the optimized value of specific surface area, power, scanning speed and scanning increment were 585m2/kg, 10kW, 1（°）/min and 0.02° respectively.