Japan Steel High-Aluminum Slag Low Silicon Ironmaking Technology
ã€China Aluminum Network】By optimizing the batching process, innovating the furnace structure, exploring the charging system, successfully applying multi-ring fabrics, researching the properties of high-aluminum slag, mastering the high-alumina smelting technology, and successfully implementing high wind temperature, high pressure, High-coal ratio, low-silicon smelting and other technologies have achieved better economic benefits in the case of reduced charge grades and reduced coke quality dogs. In the selection of economic ore smelting, it must face some unfavorable factors brought about by the economic and mining industry. The high Al2O3 content in the ore is an outstanding problem. It is generally believed that Al2O3 in slag is within 14%, which belongs to low-alumina slag, suitable for smelting; 14% to 16% belong to Chinalco slag, smelting is difficult; Al2O3 is more than 16%, it can be called high-alumina slag, smelting is very difficult . Many companies even believe that after more than 17%, they basically cannot be smelted. Through in-depth research on the performance of high-alumina slag, basically mastered the smelting technology of high aluminum slag. The lower content of Al2O3 in the slag of Rigang is also 15.5% or more, and the average is more than 18%. It belongs to the smelting of high-alumina slag. When Al2O3 exceeds 16%, the melting temperature of the slag will rise sharply above 1500oC, and the viscosity of the slag will increase. The slag viscosity is too large and the slag is sticky, which will cause a great deal of damage in the dripping zone of the blast furnace, resulting in a drop in charge and difficulty in rising the gas. In the hearth, it is difficult for the slag to separate, the retention of slag is increased, and the hearth builds up. The appearance of the slag and iron crust outside the furnace shows poor flowability and difficulties in the organization of the furnace. The ability of the blast furnace to receive wind is getting more and more. Poor, causing the blast furnace to malfunction. In view of the high viscosity and high melting temperature of high-alumina slag, the slagging system and thermal system during the smelting of high-alumina ore were readjusted. The slagging system was determined by using binary alkalinity as the main adjustment method and the tribasic alkalinity as With reference to the general principle of four-element alkalinity, the concept of magnesium-aluminum ratio (MgO/Al2O3,) is proposed. By adjusting the alkalinity of the acid-alkali material, with reference to the content of Al2O3 in the slag, the content of MgO in the slag can be controlled by adjusting the MgO in the slag, and the ratio of Al2O3, the ratio of Al2O3, and the ratio of Al2O3 can be used to control the slag without alkalinity. About 0.95 to 1.0. The heat system is based on the control of sensible heat of molten iron. Daily adjustments are made to control the silicon content in iron as a means to ensure that the physical temperature of molten iron is ≥l480oC. It is more effective to increase the slag enthalpy, reduce the viscosity of slag, and improve the fluidity of slag. The working status of the hearth was improved and the blast furnace forward was improved, achieving good results. Low silicon smelting is a comprehensive technology. Due to the gradual deterioration of the original and fuel conditions of Nisshin Steel, low-silicon smelting cannot be achieved by means of improving the quality of coke and improving the quality of the furnace. For the difficulties faced, the iron and steel technicians conducted a thorough analysis and research, and were led by the iron front department. The three systems of sintering, pellets, and ironmaking were regularly held at each ten-day meeting to emphasize the importance of low-silicon smelting for ironmaking. The importance of steelmaking and the importance of lowering silicon must be addressed within the system. The level of operation should be fully ensured to ensure the realization of low silicon smelting. The main work of the sintering plant is to stabilize the composition, increase the strength, improve the grain size, and reduce the ferrous iron. The main measures of the ironworks are: stable operation, revitalization of furnace kiln, improvement of alkalinity of slag, reduction of silicon deviation, etc. Through improved operation, the average silicon content of Nippon Steel blast furnace was reduced to 0.37%, and low silicon smelting was realized. Low-silicon smelting is a concrete embodiment of multi-ring fabric technology, rational slag phase selection, high top pressure, high air temperature and other technologies successfully applied, and it is inevitable after the ironmaking system has progressed.
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