The ore industrial grade referred to as the ore grade is a requirement of the mineral industry. In an industrial type of ore, according to the useful components of the ore, the content of harmful components, the differences in physical properties, quality, and requirements for different uses, the different grades of ore (minerals) are classified as ore industrial grades. For example, iron ore for steelmaking can be divided into four grades according to chemical composition, such as table. Depending on the content of useful components, harmful components, and physical properties (refractoriness, loss on ignition), fireclay can be divided into various roles. Different grades; mica deposits are classified into 9 types of mica according to the maximum inscribed rectangular area (cm2) within the thick mica sheet; diamonds are also classified into several different uses depending on their weight, physical properties, etc. . Therefore, the classification of ore grades has different requirements for different minerals. It is an important basis for rational mining and rational use of mineral resources.
Chemical composition (%)
TFe SiO2 S P
First grade product ≥62 ≤8 ≤0.1 ≤0.1
Secondary products ≥60 ≤10 ≤0.1 ≤0.1
Three grades ≥58 ≤12 ≤0.12 ≤0.15
Four grades ≥56 ≤13 ≤0.15 ≤0.15
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