Qing Shan

Energy Conservation and Emissions Reduction in Iron and Steel Industry

With the increasingly exhausting mineral resources and deteriorating environmental pollution, current steel making process structure must be optimized and new Iron making technology should be developed in China’s iron and steel industry to save energy and reduce emissions. The paper presents facing dilemma of iron and steel enterprises, some effective measures to cope with the problems, and especially new Ironmaking—HIsmelt, which is relatively green technology as compared to the blast furnaces. The predominance of smelting high-phosphorus iron ore and ilmenite by HIsmelt technology, which is reserved vastly in China, is analyzed selectively in the paper. Through theoretical analysis and experimental verification, conclusion could be drawn that HIsmelt technology is attractive to smelting high-phosphorus iron ore and ilmenite, which helps exploit these lean iron ore mines.

The Experimental of Dephosphorus of Smelting High Phosphorus Iron Ore

Smelting reduction iron making technology will solve the coke shortage and environmental pollution, which has become a major research of. Iron development. By oxygen top-blown high-phosphorus iron ore smelting reduction test, that the use of oxygen top-blown molten high phosphate smelting reduction technology is feasible. From the test results, dephosphorization is more appropriate for the temperature range 1500-1550, the temperature can ¿meet the mobility of iron slag, but also to meet the needs of dephosphorization, With the increase of basicity, lower phosphorus content of hot metal, when the alkalinity of 2.5, the iron content of 0.11% phosphorus, hot metal in the P content increased with increasing concentration of top-blown oxygen showed a rapid decline.

Application of Combined Thermal Equivalen in Thermal Power Plant Reduction

The 3.8MPa medium-pressure steam of Yuntianhua Company get low pressure steam through reducing temperature and pressure, which is used as a heat tracing, a reserve supply of heat. For this situation, the article based on the analysis of energy and chemical process and thermodynamic calculation, studies the technical feasibility of combined work, at the same time, it estimates economic benefit, and proposes embodiment and extends application.

Smelting High Phosphorus Iron Ore by Oxygen Enriched Top-Blown Smelting Reduction

Smelting reduction iron making technology will solve the coke shortage and environmental pollution, which has become a major research of. Iron development. By oxygen top-blown high-phosphorus iron ore smelting reduction test, that the use of oxygen top-blown molten high phosphate smelting reduction technology is feasible, and inappropriate smelting conditions, the iron recovery rate can reach 95%. Reduction in the oxygen top-blown molten smelting reduction process with the temperature increased, the iron yield and the corresponding increase in the rate of metal-based, but with the increased alkalinity of pig iron and metal production rate has dropped, the same time as the reduction time extension of pig iron and metal production rate decreased.

Smelting Potential of HIsmelt Technology for High-Phosphorus Iron Ore and Ilmenite

HIsmelt is an energy-saving and emission-reducing technology as compared to the blast furnaces (BF). This paper analyzed the preponderances of smelting high-phosphorus iron ore and ilmenite by HIsmelt technology, which is reserved vastly in China. The results showed that it is very suitable for smelting ilmenite, and iron recovery rate reached 95% with titanium content lower than 0.05% (under the conditions of 30min holding time at 1550 ¡æ, basicity of 1.1, C/O molar ratio of1.0 and oxygen enriched flow rate of 250 L/h). The iron recovery rate for high-phosphorus iron ore reached 92% with relatively high phosphorus content of pig iron about 0.28%under the reduction temperature of 1450 ¡æ. Although decreasing amplitude of phosphorus content was remarkable(0.9% in raw iron ore vs. 0.28% in pig iron), the molten iron was still not satisfied with the requirement of steelmaking. External dephosphorization of hot metal by its remanent oxidation atmosphere or ore matching could solve the problem. It can be proposed that the industrialization of HI smelt technology in China conduce to exploit the abundant high phosphorus iron ore and ilmenite in China and get rid of the dependence of iron ore imports

Experimental study on kinetics of smelting reduction for high phosphorus iron ore

Smelting reduction ironmaking technology, which can solve two problems of scarcity of coking coal and environmental pollution, must be the main direction of ironmaking development. In the smelting reduction experiment of high phosphorus iron ore with a thermogravimetric analyzer, the results show smelting reduction process of high phosphorus iron ore is very complex, improving reaction temperature and reducing partical size are beneficial to reducing reaction, and smelting reducing process of high phosphorus iron ore contains three stages: phase interfacial reaction, one-dimensional diffusion and two-dimensional diffusion, and the principal reaction is one-dimensional diffusion, which can dα ÷ dt = Ae−E÷RT f(α) to calculate kinetic parameters of smelting reduction of high phosphorus iron ore, its apparent activation energy is 70.52KJ/mol.

Numerical modelling of a slag-metal behavior of smelting reduction process: Ironmaking technology based on the hismelt

A liquid bath model for simulating the liquid slag and metal behavior of multi-fluid problems defined in 3D cylindrical geometries is presented, which is developed based on Computational Fluid Dynamics (CFD) approach. As to the issue of the multi-phase flow, a volume of fluid (VOF) model and standard k-∊ turbulent model are employed in this model. The volume fraction distribution of liquid slag and metal is obtained from the this model. The numerical predictions clearly reveal that the “splash” phenomenon in HIsmelt process is a reality, which will increase the heat transfer efficiency from post-combustion region to liquid bath, and the presence of a slag layer has important influences on the bath fluid dynamics and metal quality, because it can keep metal away from oxidizing gas, thus avoid oxidized.