1, the appearance of quality is an important basis for preliminary judgement of the quality of ferrosilicon. The appearance of good ferrosilicon should be dark grey, smooth surface, no cracks, no oxidation. The appearance of poor quality ferrosilicon may have uneven colour, rough surface, cracks and other problems;
2, the composition content is the key factor affecting the quality of ferrosilicon. The silicon content of good ferrosilicon should be in line with the standard, and the impurity content is low. You can know the composition content by checking the product label or consulting the manufacturer, and you can also test it by chemical analysis methods. If the composition content does not meet the standard, it means that the quality of the ferrosilicon is poor.
3, you can also observe the density, thermal stability, magnetism, purity and other indicators of ferrosilicon. The purity of high-purity ferrosilicon should be more than 99%, and the impurity content should be reduced to as low as possible. This can ensure that the quality of ferrosilicon is stable and can meet the requirements of the production process.
4, when observing ferrosilicon, pay attention to check whether its appearance has cracks, whether it is discoloured by hand, and whether the knocking sound is crisp. Good ferrosilicon has a bright and uniform metallic luster, and the surface lines are clear and symmetrical. While poor quality ferrosilicon is manifested as a rough surface, turbid and no light, as well as asymmetric grain, etc..
