Kunming Iron and Steel Co Ltd

Lianran, China

Kunming Iron and Steel Co Ltd

Lianran, China

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Li H.-B.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Hou Y.-L.,Kunming University of Science and Technology | Hu J.-H.,Kunming University of Science and Technology | And 2 more authors.
Kang T'ieh/Iron and Steel (Peking) | Year: 2012

Huimin high-phosphorus iron ore and ilmenite from Yunnan province was smelted by oxygen enriched top-blown smelting reduction iron-making technology. Much more details, such as iron recovery rate, distribution ratio of phosphorus and sulfur were discussed. Iron recovery could reach 95% with phosphorus content about 0.32%, sulfur content 0.054% and titanium content 0.031% in pig iron produced, under the conditions of 20min holding time at 1500 K, basicity R of 1.3, C/O mole ratio of 1.0 and oxygen enriched flow rate of 250 L/h and ore blending ratio of 1:1. Oxidizing potential of top-space of SRV and slag combination can create the driving force to partition phosphorous and titanium to the slag, which ensure the success of the experiment.


YIN S.-b.,Kunming University of Science and Technology | YIN S.-b.,Control Iron and Steel Research Institute, China | SUN X.-j.,Control Iron and Steel Research Institute, China | LIU Q.-y.,Control Iron and Steel Research Institute, China | ZHANG Z.-b.,Kunming Iron and Steel Co Ltd
Journal of Iron and Steel Research International | Year: 2010

The effect of deformation in the non-recrystallization region on the phase transformation for a low-carbon and high Nb-containing steel with coarse austenite grain size was investigated by means of dilatometric measurement and microstructure observation. The results show that with increasing the cooling rate, both the transformation start and finish temperatures measured by dilatometer are decreased, and the corresponding microstructure is transformed from ferrite and pearlite to full granular bainite gradually. The dynamic continuous cooling transformation diagram was plotted according to the dilatometric measurements and microstructure observations. Dilatometric measurements also show that the transformation start and finish temperatures of the test steel rise with increasing strain, strain rate and deformation temperature, and the reasons are discussed. © 2010 Central Iron and Steel Research Institute.


Li H.-B.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Qi Y.-L.,Kunming University of Science and Technology | Hu J.-H.,Kunming University of Science and Technology | And 2 more authors.
Journal of Iron and Steel Research International | Year: 2011

Total ilmenite from Yunnan, China, difficult to smelt in blast furnace, was smelted by oxygen-enriched top-blown smelting reduction ironmaking technology. Much more details on smelting were discussed. Specifically, the influence of reduction temperature, slag basicity and molar ratio of carbon to oxygen on the reduction quality level including iron recovery and titanium and sulfur contents in the pig iron produced in the experiment was investigated. Iron recovery rate could reach 95% with titanium content below 0. 05% in pig iron produced, under the conditions of holding time of 30 min at 1 823 K, basicity of 1.1, carbon to oxygen molar ratio of 1. 0 and oxygen-enriched flow rate of 250 L/h. Oxidization potential of top-space of smelting reduction vessel and slag combination could create the driving force to partition phosphorous, titanium and silicon into the slag, which ensured low contents of the impurities involved above and carbon in pig iron. In addition, it avoided the generation of Ti(C, N) that could reduce interfacial tension of slag, which induced the formation of foaming slag seriously. Furthermore, jam of chargings and bubble flooding would be triggered, resulting in deterioration of BF state, increase of iron loss and decline of desulfurization rate. © 2011 Central Iron and Steel Research Institute.


Wang H.-T.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Zhang Z.-M.,Kunming Iron and Steel Company
Journal of Iron and Steel Research International | Year: 2012

Low temperature exhaust gases carrying large amount of waste heat are released by steel-making process and many other industries, Organic Rankine Cycles (ORCs) are proven to be the most promising technology to recover the low-temperature waste heat, thereby to get more financial benefits for these industries. The exergy analysis of ORC units driven by low-temperature exhaust gas waste heat and charged with dry and isentropic fluid was performed, and an intuitive approach with simple impressions was developed to calculate the performances of the ORC unit. Parameter optimization was conducted with turbine inlet temperature simplified as the variable and exergy efficiency or power output as the objective function by means of Penalty Function and Golden Section Searching algorithm based on the formulation of the optimization problem. The power generated by the optimized ORC unit can be nearly as twice as that generated by a non-optimized ORC unit. In addition, cycle parametric analysis was performed to examine the effects of thermodynamic parameters on the cycle performances such as thermal efficiency and exergy efficiency. It is proven that performance of ORC unit is mainly affected by the thermodynamic property of working fluid, the waste heat temperature, the pinch point temperature of the evaporator, the specific heat capacity of the heat carrier and the turbine inlet temperature under a given environment temperature. © 2012 Central Iron and Steel Research Institute.


Lou G.,University of Science and Technology Beijing | Zhi W.,University of Science and Technology Beijing | Liu X.,University of Science and Technology Beijing | Xin Z.,University of Science and Technology Beijing | And 2 more authors.
Applied Mechanics and Materials | Year: 2011

In the paper, a 1-D unsteady mathematical model for the Gas-Solid heat transfer process of high temperature sinter has been developed, and is used to analyse the cooling process of high temperature sinter. A set of measured data is used to verify the modeling result. The agreement between the measured and the modeling is good. The effect of operation parameters on the cooling process of the annular cooler has been investigated. © (2011) Trans Tech Publications.


Yang S.-B.,Kunming Iron and Steel Co. | Yang S.-B.,Control Iron and Steel Research Institute, China | Liu Z.-D.,Control Iron and Steel Research Institute, China | Cheng S.-C.,Control Iron and Steel Research Institute, China
Journal of Iron and Steel Research | Year: 2010

The important properties of some boiler steels such as T/P92, T/P122, S30432 (Super 304H), S31042 (HR3C) and NIMS-9Cr3W3Mo were critically reviewed. The creep rupture strength, corrosion resistance and conventional strength of these steels and their welding parts were carefully compared and isothermal curve method and Larson-Miller method were used to reasonably extrapolate creep rupture strengths of these steels after 105 h service. Meanwhile, allowable stress of these steel tubes and pipes and associated engineering concerns were also discussed.


Yang X.-F.,Central South University | Yang X.-F.,Kunming Iron and Steel Company
Journal of Iron and Steel Research | Year: 2010

By means of modern measuring instruments and experiment methods including optical microscope and micrograph analyzer, the mineral phase composition, microstructure, mechanism of roasting and agglomeration of the pellets produced by blended iron ore fines of Brazil Hematite and Yunnan Magnetite were studied under the different conditions of preheating and roasting. The results show that, whether in the preheating step or in the roasting step, the existence of magnetite could benefit to generate the recrystallized Fe2O 3 since the activity of the Fe2 O3 phase newly-generated from the oxidization of magnetite is higher than that of Fe 2 O3 phase originally existing in the grains of hematite. Thus, the rational addition of the magnetite into the hematite while producing the oxidized pellets is favorable to reduce the temperature of preheating and roasting, and improve the quality of the pellet products.


Chen H.,Kunming Industrial Vocational Technical College | Fang L.-H.,Kunming Iron and Steel Co. | Sun X.-Y.,Kunming Iron and Steel Co. | Wang Z.-X.,Kunming Iron and Steel Co. | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2013

Based on the BF-BOF technology interface theory, one ladle system from BF to BOF technique feature and advantage was analyzed, including hot metal temperature drop, heat preservation, measurement, etc. At the same time, benefit was analyzed in practice for Kunming Iron and Steel Co., Ltd. problems of it were found and approached, it was concluded that the mode of using one open ladle is feasible at new zone of KISC.


Zheng L.,Kunming Iron and Steel Co. | Tao J.,Kunming Iron and Steel Co.
Yejin Fenxi/Metallurgical Analysis | Year: 2010

A determination method of iron(II) in direct reduced iron was developed by iron trichloride decomposition-potassium dichromate titration. The sample was dissolved in iron trichloride solution. The metallic iron in sample was oxidized to ferrous chloride before entering into solution, while the iron(II) remained in the sediment, which then was filtered and separated. In vacuum, the sediment was dissolved by hydrochloric acid and potassium fluoride. The solution was titrated with potassium dichromate standard solution with sodium diphenylamine sulfonate as indicator. The effects of concentration and dosage of reagent, time, titration medium and interference elements were investigated. The optimal experimental conditions were obtained: the concentration and dosage of iron trichloride were 100 g/L and 30 mL, and the stirring time was 20 min. This method was applied to the determination of iron(II) in direct reduced iron, with the relative standard deviations(RSD) of less than 2% and the recoveries in the range of 98%-101%.


Chen H.,Kunming Industrial Vocational Technical College | Lu Y.-K.,Kunming Iron and Steel Co. | Zhang J.-B.,Kunming Iron and Steel Co. | Yang J.-W.,Kunming Iron and Steel Co.
Kang T'ieh/Iron and Steel | Year: 2012

The stationary period of ladle in all processes was detailedly investigated using the running cycle method, the law of temperature drop was researched and the problems of ladle running were found. The results show that the cycle period and reasonable number of ladle can be calculated through the time statistic; there are some unnecessary running ladles; for empty ladle, the running time is longer and online baking time is shorter. Through optimizing the ladle running cycle, not only ladle running cycle is shorten so that the reasonable number of running ladle is ensured, but also the running cycle for empty ladle is speeded up and the running time for ladle is shorten about 10 minutes. Hot ladle turn round can basically be achieved. Control strategy optimization for ladle running is helpful to energy-saving, decrease in ladle number, stabilization and reduction of casting temperature, promotion of continuous casting and improvement of slab quality.

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