Effect of adding grinded sintering powder ore on pellet quality of belt roasting machine
In order to give full play to the advantages of raw material strong adaptability of the belt roasting machine and reduce the production cost of pellets,the coarse sintering powder ore was treated to a certain particle size and moisture by closed-circuit grinding process,and used in combination with magnetite concentrate as raw material for pelletizing production.The influence of green ball and roasted ball on the pellet production line of belt roasting ma-chine was investigated through industrial test.The test results show that when the proportion of MAC fines is less than 30％ ,it can be ensured that the proportion of fine grinding particle with size less than 0.074 mm(200 mesh)is more than 90％,and the water content of filter cake is less than 9％,which can meet the raw material requirements of pellet production.The drop times and compressive strength of green ball are enhanced with the increasing of grin-ded-fine ratio.The addition of grinded-fine can reduce the amount of bentonite and improve the iron grade of pellets.The addition of grinded-fine will reduce the compressive strength of roasted ball,but has no obvious effect on the re-duction degree and low temperature reduction pulverization rate.In summary,an ideal ore blending scheme is that SFCJ powder,SSFS powder and MAC powder are mixed at the ratio of 4∶3∶3 and filtered,and then the grinded-fine obtained is added to the pellet raw materials at the ratio of 40％,which can reduce the production cost of pellet.
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