Main technical quality iron ore is iron content indicators, slagging minerals (acidic oxide and basic oxide) content, the beneficial and harmful impurities, particle size, and moisture stability. The purpose of ore selection is to remove slag-forming minerals and impurities and improve the iron grade.
The molecular formula quoted represents a pure mineral state. In fact, most minerals form a mixture with other substances or impurities, and the natural content of iron is reduced.
After the ore is selected, the TFe grade is improved, and the content of slag-forming substances and other impurities in the ore is bound to decrease. The iron content of the concentrate is increased by 1%, and the increase in iron oxide content is:
The sum of iron oxides and slagging substances (including trace elements and burnout) in the ore is equal to 100%. The ore grade of TFe is increased by 1%, the corresponding iron oxide magnetite is increased by 1.38%, and the hematite is increased by 1.43%. Therefore, the content of other substances in magnetite must be reduced by 1.38%; for hematite, it must be reduced by 1.43%, in order to maintain the sum of the oxide content of each element of the ore is still 100%. Due to the different oxide content of iron, other The content of slag substances is also different. Therefore, the two different types of ore, not only the degree of difficulty of selection, but also the smelting effect of the same grade, so the requirements for the depth of selection are also different.
For ores that do not contain other special components, the slag composition is mainly composed of SiO 2 , Al 2 O 3 , CaO, MgO. Among the four components, in the Anshan-type acid ore, the SiO 2 content accounts for about 80-90%, the Al 2 O 3 content accounts for about 6-10%, and the CaO and MgO contents are not high.
The gangue of the acid ore is mainly SiO 2 , so the SiO 2 content in the concentrate is significantly reduced after the iron grade is increased.
The multi-element analysis of chemical composition of Qian'an Iron Concentrate in Shougang Sintering Plant has been shown in Figure 1 to Figure 4.
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The slag-forming components all decreased with the increase of TFe grade, and the decrease of SiO 2 was the most obvious. The relationship is:
y=88.19-1.26x
(where y represents SiO 2 content and x represents TFe grade)
That is, the TFe grade is increased by 1%. The SiO 2 content is reduced by 1.26%.
According to the analysis of the concentrate components of different grades in Anshan Iron and Steel Research Institute of Anshan Iron and Steel Research Institute, the concentrate grade is calculated to increase by 1%, and the average value of SiO 2 content change is (%):
Dagushan Donganshan Qidashan Gongchangling 1.29 1.18 1.27 1.29
The average concentrate grade increased by 1% and the SiO 2 content decreased by 1.28%.
The relationship between various gangue components and iron grade is related to the proportion of this component in the gangue composition. The greater the proportion, the greater the magnitude of the change as the grade changes. As the Haimei Mountain and Hebei Fushan ore are dry semi-self-fluxing ores, the variation of SiO 2 with iron grade is small. For the Meishan mine, the TFe grade increased by 1%, and the SiO 2 decreased by 0.45. For Fushan Mine, the TFe grade increased by 1% and the SiO 2 decreased by 0.32%.
Due to the different grades of discarded gangue, the acid gangue is discarded, and the content of alkaline gangue is very small. Some of the alkaline gangue is discarded, so the economic benefits of improving the ore grade are also different. Therefore, the requirements for the depth of selected ore for different gangue components should also be different. The selection of acid ore is of great significance, requiring a higher grade of iron, while for semi-self-fluxing or self-fluxing ore, the grade of iron can be relatively low.
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