Industrial Test of Higher Lump Ore Percentage in Zhongtian Steel No.3 BF
For cutting down the production cost and boosting the production efficiency,an industrial test of smelting with higher lump ore percentage of over 35％is made in Zhongtian Steel No.3 BF,where the operators take some actions,inclu-ding supplying the blast at constant flow rate,controlling the oxygen flow rate and reducing pulverized coal injection amount,etc..In addition,the measures of keeping the edge gas flow develop appropriately,and making the central gas flow develop in coordination with that of the edge gas flow are also taken to ensure ideal permeability,stable and smooth running of the furnace.When the lump ore percentage is increased from 17％to 35％,the drip performance of the integrated charges does not change greatly,thus,the point of interest focuses on the metallurgical property of the integrated charge rather than that of one kind of raw material.The cost and economic benefit calculation show that when the lump ore percentage is increased to 30％-35％,the hot metal production cost falls from RMB 3005.23yuan/t to 2956.53yuan/t,i.e.decreasing by RMB 48.7yuan/t,which means the best economic benefit.
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