Henan Winna Industrial group Co.

Gongyi, China

Henan Winna Industrial group Co.

Gongyi, China
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Jiao K.X.,University of Science and Technology Beijing | Zhanga J.L.,University of Science and Technology Beijing | Liua Z.J.,University of Science and Technology Beijing | Zhao Y.G.,Henan Winna Industrial group Co. | Houa X.M.,University of Science and Technology Beijing
Journal of Mining and Metallurgy, Section B: Metallurgy | Year: 2015

A type of carbon composite brick was produced via the microporous technique using natural flack graphite, α-Al2O3 and high-quality bauxite chamotte (Al2O3≥87 mass%) as raw materials with fine silicon powder as additive. The composition and microstructure of the obtained carbon composite were characterized using chemical analysis, XRD and SEM with EDS. The high temperature properties of thermal conductivity, oxidization and corrosion by molten slag and hot metal of the composite were analyzed. Based on these, the type of carbon composite brick worked in a blast furnace hearth for six years was further sampled at different positions. The protective layer was found and its chemical composition and microscopic morphology were investigated. It is found that the carbon composite brick combines the good properties of both the conventional carbon block and ceramic cup refractory. The protective layer near the hot face consists of two separated sublayers, i.e. the slag layer and the carbon layer. A certain amount of slag phase is contained in the carbon layer, which is caused by the reaction of coke ash with the refractory. No obvious change in the chemical composition of the protective layer along the depth of the sidewall is found. This work provides a useful guidance for the extension of the lifetime of blast furnace hearths.


Zhang J.,University of Science and Technology Beijing | Jiao K.,University of Science and Technology Beijing | Liu Z.,University of Science and Technology Beijing | Yang T.,University of Science and Technology Beijing | And 2 more authors.
AISTech - Iron and Steel Technology Conference Proceedings | Year: 2015

The long blast furnace hearth campaign is heavily dependent upon the quality of refractory materials. In the paper, a novel type of refractory lining material called micro-pore carbon composite brick was developed to satisfy the long lifespan and trouble-free specification of blast furnace hearth lining. This type of lining material possesses the advantages of carbon blocks such as high thermal conductivity and excellent alkali resistance and also the advantages of conventional ceramic cup such as superior compressive strength, high wear resistance, and excellent resistance to hot metal erosion. Micro-pore carbon composite brick have been applied in several blast furnace hearths in China and the results show that when the high smelting intensity of blast furnace is maintained to realize the high furnace productivity, the blast furnace hearth has been working smoothly for seven to eight years almost without damaging. Therefore, it is reasonable to assert that the blast furnace hearth lined with micro-pore carbon composite brick is capable of reaching a lifespan over 20 years. AISTech 2015 Proceedings © 2015 by AIST.


Zuo H.,University of Science and Technology Beijing | Wang C.,University of Science and Technology Beijing | Zhang J.,University of Science and Technology Beijing | Zhao Y.,Henan Winna Industrial Group Co. | And 2 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2015

The oxidation behaviors and kinetics of carbon bricks used in blast furnace hearth were investigated based on the thermodynamic analysis and the oxidation resistance experimental results. The results show that the mass loss of carbon bricks is due to the loss of carbon. The mass loss increases with increasing temperature and holding time. The oxidation process of carbon bricks belongs to the model of continuous oxidation rather than the model of protective oxidation. At 800-1200 ℃, the rate-controlled step of oxidation process is the C-O reaction and the activation energy is 5586.76 J/mol. The oxidation layer is formed in the internal carbon bricks due to the loss of carbon. The area of oxidation layer increases with increasing temperature and holding time, thus decreasing the strength and the density of the materials. ©, 2015, Chinese Ceramic Society. All right reserved.


Zuo H.,University of Science and Technology Beijing | Wang C.,University of Science and Technology Beijing | Zhang J.,University of Science and Technology Beijing | Zhao Y.,Henan Winna Industrial Group Co. | Jiao K.,University of Science and Technology Beijing
TMS Annual Meeting | Year: 2015

Traditional refractory materials for blast furnace hearth lining are mainly composed of carbon bricks and the ceramic cup. However, these materials can't meet the demands for long service life design of blast furnaces. In this paper, a new refractory called carbon composite brick (CCB) was introduced, which combined the advantages of carbon bricks and the ceramic cup. In this case, the resistance of the CCB against corrosion was equal to the ceramic cup and the thermal conductivity of the CCB was equal to carbon bricks. From the results of more than 20 blast furnaces, the CCB could be well used in small blast furnaces and large blast furnaces. In the bad condition of low grade burden and high smelting intensity, the CCB gave full play to the role of cooling system, and effectively resisted the erosion of hot metal to improve the service life of blast furnaces.


Zuo H.,University of Science and Technology Beijing | Wang C.,University of Science and Technology Beijing | Zhang J.,University of Science and Technology Beijing | Zhao Y.,Henan Winna Industrial Group Co. | Jiao K.,University of Science and Technology Beijing
Ceramics International | Year: 2015

Al2O3-SiC-SiO2-C composites are widely used in ironmaking operations due to their favorable erosion-resistance. In the present paper, the oxidation behavior and kinetics of Al2O3-SiC-SiO2-C composites in air are investigated in terms of a theoretical analysis associated with the experimental data. Furthermore, the effects of temperature on the oxidation reaction are discussed. The results show that the oxidation of Al2O3-SiC-SiO2-C composites is mainly caused by atmospheric oxygen reacting with C and SiC in the materials. At 1200 °C, a protective layer can be found on the material surface due to the formation of the mullite phase. Predictions from the Chou model are in agreement with the experimental data. The characteristic oxidation time which indicates anti-oxidation properties for Al2O3-SiC-SiO2-C composites at 1000 °C and 1200 °C are 142.41 min and 264.89 min, respectively, indicating that the material at 1200 °C is more resistant to oxidation due to the formation of a protective layer on the surface. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.


Zuo H.,University of Science and Technology Beijing | Wang C.,University of Science and Technology Beijing | Zhang J.,University of Science and Technology Beijing | Jiao K.,University of Science and Technology Beijing | Zhao Y.,Henan Winna Industrial Group Co.
TMS Annual Meeting | Year: 2015

The carbon composite brick is a new refractory used in blast furnace hearth and bottom. It caused wide attention due to its high thermal conductivity and low erosion by molten iron. In this paper, chemical constituents, SEM-EDS and X-ray diffraction were carried out in order to understand reaction mechanisms. A series of experiments of oxidation resistance characteristics were made. The oxidation mechanisms of carbon composite bricks in the presence of air were analyzed. According to the analysis on many experimental results, the oxidation process of carbon composite bricks under different temperatures were controlled by different mechanisms. In the condition of high temperature, SiO2 as oxidation product hindered the diffusion of O2, and reduced the oxidation loss of graphite in the internal.


Zuo H.,University of Science and Technology Beijing | Wang C.,University of Science and Technology Beijing | Zhang J.,University of Science and Technology Beijing | Shao J.,University of Science and Technology Beijing | And 2 more authors.
Ceramics International | Year: 2015

Oxidation of carbon is one of the main problems in alumina-carbon based refractory. In this paper, the oxidation behaviors of novel carbon composite brick and traditional carbon brick were investigated by non-isothermal and isothermal experiments, and the samples after oxidation were examined by SEM and EDS analysis. The results show that the oxidation resistance of carbon composite brick is better than that of carbon brick. At 800-1200 °C, the oxidation kinetics of carbon brick follows the linear rate law, which belongs to non-protective oxidation, and the oxidation activation is 5586.76 J/mol. However, the oxidation kinetics of carbon composite brick follows the parabolic rate law, which belongs to protective oxidation. The compressive strength decreases with the increasing mass loss after oxidation due to the carbon loss, so for carbon composite brick which has less content of carbon the oxidation resistance is better than that of carbon brick. Furthermore, the existence of SiC in the surface of carbon composite brick is another reason for its good oxidation resistance. © 2015 Elsevier Ltd. and Techna Group S.r.l. All rights reserved.


Jiao K.-X.,University of Science and Technology Beijing | Zhang J.-L.,University of Science and Technology Beijing | Zuo H.-B.,University of Science and Technology Beijing | Zhao Y.-A.,Henan Winna Industrial Group Co.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2014

The formation mechanism of the viscous layer in the blast furnace hearth was studied through chemical analysis, XRD, SEM-EDS analysis and the carbon composite brick property test. The results showed that the carbon composite brick has excellent anti-corrosion properties to the iron and slag because of its dense microstructure. Furthermore, it has self-protection function by formation the multiphase system consisted of the graphite-C layer, high alumina slag layer and the graphite layer. The thermodynamic condition of the graphite precipitation on the sidewall of the hearth was calculated. Under a certain flow condition of the molten iron, there was a dissolution and precipitation equilibrium between the graphite precipitation and the molten iron. Thereby, the graphite separated the direct contact of the molten iron from the brick. Then the erosion of the brick slowed down and the long service life of the blast furnace was achieved.

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