Industrial preparation method of high-fine-powder-rate ore agglomerates
A high-fine powder, man-made technology, applied in the field of iron and steel metallurgy, can solve the problems affecting the air permeability of the sintered material layer, high fine powder rate of sintered iron material, and affecting sintering production, etc.
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Embodiment 1
[0013] Baotou Steel two 265m 2 Sintering machine, material layer thickness is 700mm. Under the condition of the same alkalinity (2.0) and MgO content (2.4) of the finished ore, when this method is adopted and the ratio of green balls is controlled at 20%~26%, compared with the conventional sintering process, the iron-containing raw materials can be The proportion of medium iron concentrate is increased by 10-15 percentage points on the basis of 60%-62%, and the proportion of ultra-fine iron concentrate (-300 mesh reaches 75%-80%) in iron-containing raw materials can reach 30% ~45%. At the same time, the air permeability of the sintering material layer did not deteriorate, the speed of the sintering machine increased from 2.2m / min before the implementation to 2.3m / min after the implementation, and the negative pressure of the main pipe decreased from 14.52 kpa before the implementation to 14.11 kpa after the implementation; After this method, the unit-hour output reaches 320 ...
Embodiment 2
[0015] One Baotou Steel 265 m 2 Sintering machine, material layer thickness 700mm. The method is adopted to produce artificial lump ore with an alkalinity of 1.5-1.6. Under the condition of the same type and proportion of iron materials, when the proportion of green pellets reaches 40~48%, compared with the sintered ore with a basicity of 2.0 produced by the conventional sintering process, after the implementation, the output per unit hour reaches 313.24 t / h, utilization factor 1.182 t / m 2 .h, 6.9% higher than before implementation; fuel consumption decreased by 2~3 kg / t; drum strength index of finished ore was 73%~75%, 1.5~2.0% lower than before implementation; sinter grade was 57%~ 58%, an increase of 0.3-0.5 percentage points compared with before implementation, and the metallurgical properties of the finished ore under this basicity condition can still maintain the metallurgical properties of the high-basic sintered ore produced by the conventional sintering process, and...
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