Experimental study on improving the quality and reducing impurities of a certain mixed iron ore concentrate in China
In response to the changes in the particle size and impurity SiO2 content of iron minerals in a domestic mixed iron ore beneficiation plant as the ore enters deep mining,resulting in a mass fraction of SiO2 greater than 6.0％in the iron concentrate,beneficiation experiments were conducted to reduce the impurity SiO2 content in the iron concentrate.The recommended optimized process flow for this experiment is:weak magnetic roughing—weak magnetic scanning—coarse separation(＞0.25 mm)—SLON vertical ring high gradient strong magnetic roughing—SLON vertical ring high gradient strong magnetic scanning—weak magnetic and strong magnetic scanning concentrate regrinding—weak magnetic separation—SLON vertical ring high gradient strong magnetic separation.The results showed that the concentration of weak magnetic separation had a significant impact on the separation effect of weak magnetic separation.When the mass fraction of weak magnetic separation decreased from 33.3％to 14.3％,the mass fraction of TFe of weak magnetic concentrate increased from 60.84％to 64.91％,while its mass fraction of SiO2 decreased from 5.00％to 3.02％.The process of regrinding(＜74 µm accounts for 60％)and reselection(weak magnetic-strong magnetic)can be used for weak magnetic scanning and strong magnetic scanning concentrates to obtain iron concentrate with a TFe mass fraction of 59.31％,a SiO2 mass fraction of 4.64％,and iron recovery rate of 90.44％.
mixed iron oregraderegrinding and reconcentrationmetal recovery rate
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