It is not only beneficial for iron smelting to reduce silicon content in hot metal, it also has good benefit for steelmaking.. According to the statistics of many enterprises, the silicon element per 0.1% reduction, fuel ratio of 4kg/t, yield increase 5 - 7%, and are good for the stability of the furnace.. For steelmaking, to reduce the silicon element can reduce the amount of desilication reaction consumption of lime and slag quantity and improve the process of steelmaking refining effect; at the same time with the reduction of the amount of slag, smelting time is shortened and improve the productivity. Therefore, the low silicon smelting for iron and steel enterprise is imperative, is an enterprise important benefit growth point. Advancing low silicon smelting is carried out synchronously with all the blast furnace of the whole iron smelting plant.,Each blast furnace has different characteristics, the situation is not the same, some of the blast furnace itself is better, some of the blast furnace itself is equipped with a little bit. Through the mutual learning, mutual benchmarking for the gap of blast furnace, blast furnace has a different degree of progress.
we Yonggang blast furnace since may implement low silicon smelting has obvious economic benefit and the ironmaking plant daily output from the April average 19673 tons rise to 20277 tons in May, June is basically stable in more than 20700 tons, silicon by more than 0.5% dropped to 0.413%, June is basically stable at about 0.38%, grade into the furnace decreased the realized yield indicators of progress and economic benefits obvious.Steelmaking since the hot metal output increased and then gradually reduce the amount of scrap to join the monthly only reduced the cost of 10 million yuan, plus fuel to bring down the efficiency ratio of per month to reduce the cost of nearly 15 million, since the implementation of the low silicon smelting, furnace remained the smooth and stable, with a further improvement in the furnace, the indicators have progress of space.
1.2 principle of low silicon smelting: the silicon does not drop the heat, the heat loss is not reduced silicon. To achieve low silicon smelting, must do to ensure adequate hearth thermal physics, heat would undermine the airflow of the normal distribution hearth deficit, resulting in hearth disorders, fuel ratio significantly increased, operation of BF is broken.The cooling of the furnace is the cause of most of the furnace conditions, the harm caused by the furnace cooling to the blast furnace is enormous.. Therefore, low silicon smelting, you must pay attention to the hearth heat, only hearth heat abundant, in order to have a drop of silicon space to the blast furnace produce benefits.
1.3 low silicon smelting benefits: the reduction of silicon content in hot metal is not only beneficial for iron smelting, and also has a greater benefit for steelmaking. According to the statistics of many enterprises, the silicon element per 0.1% reduction, fuel ratio of 4kg/t, yield increase 0.5 - 0.7%, and are good for the stability of the furnace.. In the case of steel smelting, it can reduce the amount of lime and slag, and improve the refining effect of the process.;At the same time, with the reduction of slag amount, smelting time and productivity increase. Therefore, the low silicon smelting for iron and steel enterprise is imperative, is an enterprise important benefit growth point.
1.4 low silicon smelting measures
low silicon smelting measures:
strengthen the original fuel into the furnace management, fine material is the same topic, but also blast furnace to obtain good economic and technical indicators of the necessary conditions. What tell here concentrate not necessarily to grade into the furnace how high, coke quality how good, to reach a certain standard to concentrate, because for now, iron and steel enterprises mostly in profit or loss in operation,Upstream raw materials prices decline below the decline of steel products. Therefore, the iron and steel enterprises has not excessive pursuit of high grade into the furnace and coke quality, low cost strategy has become the pursuit direction of current steel prices, how to realize stability of BF, in case of deterioration of raw material and fuel condition, how to make comprehensive benefits maximized become enterprises in their efforts to the goal. Blast furnace, to strengthen the management of raw materials and fuel is mainly in three aspects: one is the stability of the furnace charge structure, blast furnace operation stability and change is relative, change is absolute, but stability is our pursuit of the goal. Is a stable raw material requirements of burden structure is relatively stable, not frequent adjustment,Because any kind of raw material changes will affect the soft melting zone changes, especially changes or the same proportion of the material greatly change material impact larger, late May factory blast furnace abnormal is and then sintering ore proportion greatly decreased the proportion of pellet rose sharply on. Coke, Yonggang procurement coke manufacturers, mixed breed, stockyard stacker and Reclaimer aspects still exist many problems, plus Yonggang, located in the south, frequent rain, large fluctuations in atmospheric humidity, resulting in coke actual moisture fluctuations larger, blast furnace fuel ratio greater volatility, now coke gradually realize tile straight, ingredient stability has been strengthened. Two is to strengthen the screening management,Reduce powder into the furnace. Requirements of blast furnace raw material to high, cooked, net, stability, small and uniform, the net is to emphasize the sieve net powder, by strengthening the slot sieve to reduce powder into the furnace, to Yonggang, lump ore varieties varied, sieving difficult, by increasing the vibration amplitude of the sieve, prolonged vibration feeding time, timely replacement of check the screen and to maximize the screening effect is ensured. Three is the original fuel ingredients to be relatively stable. At present, sinter composition alkalinity fluctuation is still large, especially alkalinity fluctuation, to slag basicity balance brings a big problem, resulting in frequent burden structure adjustment and stability of blast furnace can not be guaranteed.
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