不易破碎钒铁制样方法探讨

Discussion on sample preparation method of non-friable ferrovanadium

采用多种材质料钵的不同粉碎机进行不同粒度或不同粉碎时间制备试样,检测试样中钒、料钵材质的特征元素和氧成分含量并分别计算它们的变化量,找到了料钵材质磨粉、空气中氧共同对试样的不同程度污染是导致钒含量偏低的原因。根据破碎机性能,选配制样设备并确定样品破碎粒度控制点,经试验确定制样方法的样品缩分K值为0.02。采取选用粉碎能力强且料钵材质耐磨性能较好的振动粉碎机粉碎样品、严格控制试样粒度、限时粉碎等措施,以减少污染。实验方法是先将原样用颚式破碎机破碎至粒度-10mm,混匀后缩分留不少于2.0kg样品,再颚式破碎至-5mm,混匀后缩分留不少于0.5kg样品;然后限时振动粉碎至-1.0mm,混匀后缩分留不少于50g样品;最后限时振动粉碎至分析试样粒度-0.250mm。实验方法对不易破碎的FeV_(50)、FeV_(80)的制样精确度(钒含量)βD分别为0.23、0.31,试样测定精确度βM分别为0.18、0.19,对6kg大样制备成试样的时间为14min。

The ferrovanadium was broken to different particle sizes or for different time using crusher with various grinding tanks for sample preparation. The content of vanadium, characteristic element of grinding tank material and oxygen in sample was detected. The change of content was calculated. It was found that the abrasive powders of grinding tanks and oxygen in air were the main reason to cause lower content of va- nadium. According to the property of crusher, the sample preparation equipment and the control points of sample particles were selected. The experiments showed that the sample splitting K value of preparation method was 0.02. The vibration crusher with powerful grinding ability and good wear-resistance of grind- ing tank material was selected to break the sample, and the particle size and grinding time of sample were strictly controlled to reduce pollution. The original sample was crushed to --10 mm with jaw crusher. Af- ter uniformly mixing, at least 2. 0 kg of sample was used for splitting. Then, it was erushed to --5 mm with jaw crusher, and at least 0. 5 kg of sample was used for splitting. It was vibrated and crushed to -- 1.0 mm within certain period. After uniformly mixing, at least 50 g of sample was used for splitting. Fi- nally, the sample was erushed to --0. 250 mm within certain period for analysis. The sample preparation precision （vanadium content, β_D） of non-friable FeV_50 and FeV_80 by experimental method was 0. 23 and 0. 31, respectively. The sample determination precision （β_M） was 0. 18 and 0. 19, respectively. The prepa- ration time for 6 kg sample was about 14 min.