云南褐煤半焦用于硅铁生产的试验研究

基于云南褐煤半焦的独特性能，试验采用褐煤半焦替代50％的冶金焦冶炼硅铁。研究了褐煤半焦粒度、活性、灰分等指标对生产硅铁的影响。结果表明：入炉褐煤半焦水分应控制在10％左右；半焦中-4mm组分不应超过10％，4—6mm质量分数应达到50％左右；半焦化学活性高对冶炼硅铁有利，但同时提高了还原剂灰分中Al2O3的还原率，对生产75％硅铁不利，因此褐煤半焦用作冶炼硅铁的灰分应不超过7％。通过混合焦和冶金焦的应用试验，说明采用混合焦的产品中Al平均质量分数为2．27％，ω（A1）〈2％的产品率为28．56％，比同期全部用冶金焦下降7．39％；采用混合焦的电耗下降37kWh／t，还原剂耗量增加了3．2％，低Al产品率稍有下降；褐煤半焦部分替代冶金焦生产硅铁是可行的，且具有一定的节电降耗作用。

Application of Yunnan lignite semi-coke in ferrosilicon production

In view of excellent properties of Yunnan lignite semi-coke, which is used to replace 50 percent metallurgical coke to produce ferrosilicon. Investigate the impact of lignite semi-coke particle size, reactivity, ash and other indicators. The results show that,the moisture of feeding lignite semi-coke should be controlled around 10 percent, the particle size less than 4 mm component of semi-coke should not exceed 10 percent, the mass fraction of component ranging from 4 mm to 6 mm should reach about 50 percent. The high reactivity property of semi-coke is favorable to the smelting ferrosilieon, while improving the reduction ratio of A12 03 in ash content which is negative to the 75 percent ferrosilicon production, so the ash content in semi-coke should not be over 7 percent. Application tests on mixed semi-coke and metallurgical coke show that, the mass fraction of A1 in the product made by mixed coke is 2.27 percent on an average. Product rate of ferrosilieon, whose A1 content is less than 2 percent is 28.56 percent, down 7.39 percent compared with wholly using metallurgical coke. Using mixed coke, electricity consumption decrease 37 kWh/t, reductant consumption increase 3.2 percent, while lower A1 content product drop slightly. All of these indicate partial substitution of lignite semi-coke for metallurgical coke in ferrosilicon production is feasible, and has a certain role in saving energy.