With the aim of locating the source of the harmful elements in BF,sintering dust and BF dust of Guofeng iron-making system have been analyzed by SEM,EDS,XRD and surface scan.The results indicated that BF gravitational dust and the dust collected at the head of sintering machine which contained small amounts of hazardous elements could be directly put into sintering production.The dust collected at the end of sintering machine mainly contained three harmful elements: K,Cl and S,almost all K and Cl existing in sinter was in the form of KCl.The harmful elements in BF bag dust which existed in the form of flocculent crystal was complicated,their nucleation and growth were mostly in Zn-based.K and Cl adhered to flocculent crystal and S almost concentrated in the crystal.BF cloth-bag dust and the dust collected at the head of sintering machine should be handled before put into sintering production.

As the influences of MgO and Al2O3 gangue and acid burden have not been taken into account in traditional evaluation method for iron ore fines sintering,a new evaluation method for economic value of iron ore fines sintering based on cost of hot liquid iron was put forward in this paper,that is,under the set binary basicity and MgO to Al2O3 ratio of slag,the cost of hot liquid iron(Yuan/t) per ton of sinter product was used as the evaluation index for economic value of iron ore fines sintering.The result of this method is more accurate and reliable and able to reflect the economic benefits of iron ore fines sintering.

对承德盛丰1号高炉(600m3)高风速操作进行了总结分析.认为小型高炉只要风速选择适当,通过上下部合理调剂,可在高风速(315.67m/s)条件下,使炉缸活跃,实现稳定顺行、高产稳产.

By researching the change of gas composition in coke circulating zone of blast furnace and analyzing the influence of chemical equilibrium on theoretical combustion temperature, a new theoreti- cal combustion temperature mathematical model was put forward based on the traditional one. The on- line computation of the model was realized and practiced in Guofeng Iron and Steel Co., Ltd. No. 1 BF by the technologies of data acquisition and processing and programming, which built a high speed in- formation channel of theoretical combustion temperature. Practice proved that the model could effec- tively help foremen to better understand the condition of blast furnace hearth, so that blast furnace sta- bility and long campaign life were promoted greatly.

To further decrease the fuel consumption of blast furnace in Tangshan Guofeng Iron and Steel Co Ltd, measures of improving the quality of sinter and pellet and the performances of raw materials were put forward through phase analysis and physical and chemical performance testing. The measures of increasing the grade of sinter, decreasing the sinter reduction degradation index at low temperature, and increasing the sinter soft melt performance at elevated temperature, as well as the reasonable process parameters of sintering were described in detail.

Under the conditions of raw materials and operation of Guofeng Iron and Steel Group Co.,Ltd.,the influences of unburned pulverized coal in blast furnace slag on the properties of fluidity,melting properties and melting temperature were investigated,and the mineral analysis was also done.In the conditions of present raw materials and operation,the unburned pulverized coal content should be controlled under 9%,at the same time the best pulverized coal injection rate should be limited at 150 kg/t or so.So these research results can offer theoretical basis for further enriched oxygen injection of coal and reduction of the ratio of integrated fuel.

The properties of imported ores at Guofeng Iron and Steel Co.,Ltd.(abbreviated by Guofeng) were studied by experiment.By mixing Australia ores,Brazil ores,and India ores,respectively,the reasonable ore mixing scheme was found.Appropriate sintering parameters were also determined.By controlling appropriate sinter basicity,MgO content,Al2O3 content,and FeO content,adopting low temperature sintering,and sintering in oxidizing atmosphere,the quality of sinter was improved.Moreover the fuel consumption for blast furnace ironmaking was decreased effectively.

The model in lab was built based on similar theory.The charging track equation was corrected as n=[l_0~2cos~2β+2l_0cosβL_x+(1+4π~2ω~2l_0~2/C_1~2)L_x~2]~(1/2)-αthrough the tests in lab.The natural stack angles of coke and ore were 30.2 and 29.1 respectively.The inside stack angle was gained by the formula of tanα=tanα_0-kh/R,and the outside stack angle by the formula ofα_(ore)=79.77-2.04αandα_(coal)=73.12-1.97α.The bulk densities of coke and ore were 0.65 and 1.97 t/m~3.The mathematical model was set up and the program interface was studied.The charging shape was simulated by computer,and it more truly reflected the charging shape in BF.