The Experts below are selected from a list of 1890 Experts worldwide ranked by ideXlab platform

Miaoyong Zhu - One of the best experts on this subject based on the ideXlab platform.

  • influence of tio2 addition on the oxidation induration and reduction behavior of hongge vanadium titanomagnetite pellets with simulated Shaft Furnace gases
    Powder Technology, 2018
    Co-Authors: Nan Wang, Mansheng Chu, Miaoyong Zhu
    Abstract:

    Abstract This study investigated the oxidation induration of Hongge vanadium titanomagnetite pellets (HVTMP) with different TiO2 additions, and its influence on subsequent reduction behavior with simulated Shaft Furnace gases. The results showed that the addition of TiO2 decreased the compressive strength and increased the porosity of the HVTMP, and eventually had a detrimental effect on the oxidation induration process. The oxidation induration mechanism was further elucidated by the means of XRD and SEM. When more TiO2 was added, the reduction degree and rate of the HVTMP decreased due to the generation of Fe2TiO5 during the oxidization induration process, which was unfavorable for the subsequent reduction process. The morphology structure confirmed that the growth of metallic iron whiskers was suppressed with an increase in TiO2, which resulted in the decrease of reduction swelling. Furthermore, the reduction swelling and compressive strength of the reduced HVTMP exhibited a reverse linear relationship. The current study not only provides experimental evidence to establish a correlation between TiO2 addition and oxidation reduction behavior, but also provides both a theoretical and technical basis for the effective utilization of Hongge vanadium titanomagnetite either in blast Furnace or Shaft Furnace.

  • Influence of roasting characteristics on gas-based direct reduction behavior of Hongge vanadium titanomagnetite pellet with simulated Shaft Furnace gases
    Powder Technology, 2017
    Co-Authors: Wei Li, Mansheng Chu, Guiqin Fu, Nan Wang, Miaoyong Zhu
    Abstract:

    In the present work, the correlations between roasting characteristics of Hongge vanadium titanomagnetite pellet (HVTMP) and its subsequent reduction behaviors were investigated with simulated Shaft Furnace gases. The results showed that the compressive strength of HVTMP increased with the increase of roasting temperature and roasting time. Increasing roasting temperature and roasting time accelerated its subsequent reduction, however, the reduction rate decreased when the pellets roasted at 1250 °C were used. The roasting conditions of oxidized pellets had a slight effect on the phase compositions of the reduced pellets. The severest reduction swelling was observed when the pellets roasted at 1050 °C were adopted. The abnormal swelling could be suppressed by increasing the roasting temperature and roasting time. Moreover, abnormal swelling was caused by the forming of a large number of metallic iron whiskers during gas-based direct reduction. A conceptual diagram was formulated to describe the swelling mechanism at different roasting conditions. In practical industrial production of HVTMP, the roasting conditions should be optimized as far as possible to improve the reduction swelling under the prerequisite of meeting the compressive strength of the HVTMP smelting in the gas-based Shaft Furnace. This study aims to provide both theoretical and technical basis for the effective utilization of HVTM in either blast Furnace or Shaft Furnace.

Nan Wang - One of the best experts on this subject based on the ideXlab platform.

  • influence of tio2 addition on the oxidation induration and reduction behavior of hongge vanadium titanomagnetite pellets with simulated Shaft Furnace gases
    Powder Technology, 2018
    Co-Authors: Nan Wang, Mansheng Chu, Miaoyong Zhu
    Abstract:

    Abstract This study investigated the oxidation induration of Hongge vanadium titanomagnetite pellets (HVTMP) with different TiO2 additions, and its influence on subsequent reduction behavior with simulated Shaft Furnace gases. The results showed that the addition of TiO2 decreased the compressive strength and increased the porosity of the HVTMP, and eventually had a detrimental effect on the oxidation induration process. The oxidation induration mechanism was further elucidated by the means of XRD and SEM. When more TiO2 was added, the reduction degree and rate of the HVTMP decreased due to the generation of Fe2TiO5 during the oxidization induration process, which was unfavorable for the subsequent reduction process. The morphology structure confirmed that the growth of metallic iron whiskers was suppressed with an increase in TiO2, which resulted in the decrease of reduction swelling. Furthermore, the reduction swelling and compressive strength of the reduced HVTMP exhibited a reverse linear relationship. The current study not only provides experimental evidence to establish a correlation between TiO2 addition and oxidation reduction behavior, but also provides both a theoretical and technical basis for the effective utilization of Hongge vanadium titanomagnetite either in blast Furnace or Shaft Furnace.

  • Influence of roasting characteristics on gas-based direct reduction behavior of Hongge vanadium titanomagnetite pellet with simulated Shaft Furnace gases
    Powder Technology, 2017
    Co-Authors: Wei Li, Mansheng Chu, Guiqin Fu, Nan Wang, Miaoyong Zhu
    Abstract:

    In the present work, the correlations between roasting characteristics of Hongge vanadium titanomagnetite pellet (HVTMP) and its subsequent reduction behaviors were investigated with simulated Shaft Furnace gases. The results showed that the compressive strength of HVTMP increased with the increase of roasting temperature and roasting time. Increasing roasting temperature and roasting time accelerated its subsequent reduction, however, the reduction rate decreased when the pellets roasted at 1250 °C were used. The roasting conditions of oxidized pellets had a slight effect on the phase compositions of the reduced pellets. The severest reduction swelling was observed when the pellets roasted at 1050 °C were adopted. The abnormal swelling could be suppressed by increasing the roasting temperature and roasting time. Moreover, abnormal swelling was caused by the forming of a large number of metallic iron whiskers during gas-based direct reduction. A conceptual diagram was formulated to describe the swelling mechanism at different roasting conditions. In practical industrial production of HVTMP, the roasting conditions should be optimized as far as possible to improve the reduction swelling under the prerequisite of meeting the compressive strength of the HVTMP smelting in the gas-based Shaft Furnace. This study aims to provide both theoretical and technical basis for the effective utilization of HVTM in either blast Furnace or Shaft Furnace.

Mansheng Chu - One of the best experts on this subject based on the ideXlab platform.

  • influence of tio2 addition on the oxidation induration and reduction behavior of hongge vanadium titanomagnetite pellets with simulated Shaft Furnace gases
    Powder Technology, 2018
    Co-Authors: Nan Wang, Mansheng Chu, Miaoyong Zhu
    Abstract:

    Abstract This study investigated the oxidation induration of Hongge vanadium titanomagnetite pellets (HVTMP) with different TiO2 additions, and its influence on subsequent reduction behavior with simulated Shaft Furnace gases. The results showed that the addition of TiO2 decreased the compressive strength and increased the porosity of the HVTMP, and eventually had a detrimental effect on the oxidation induration process. The oxidation induration mechanism was further elucidated by the means of XRD and SEM. When more TiO2 was added, the reduction degree and rate of the HVTMP decreased due to the generation of Fe2TiO5 during the oxidization induration process, which was unfavorable for the subsequent reduction process. The morphology structure confirmed that the growth of metallic iron whiskers was suppressed with an increase in TiO2, which resulted in the decrease of reduction swelling. Furthermore, the reduction swelling and compressive strength of the reduced HVTMP exhibited a reverse linear relationship. The current study not only provides experimental evidence to establish a correlation between TiO2 addition and oxidation reduction behavior, but also provides both a theoretical and technical basis for the effective utilization of Hongge vanadium titanomagnetite either in blast Furnace or Shaft Furnace.

  • Influence of roasting characteristics on gas-based direct reduction behavior of Hongge vanadium titanomagnetite pellet with simulated Shaft Furnace gases
    Powder Technology, 2017
    Co-Authors: Wei Li, Mansheng Chu, Guiqin Fu, Nan Wang, Miaoyong Zhu
    Abstract:

    In the present work, the correlations between roasting characteristics of Hongge vanadium titanomagnetite pellet (HVTMP) and its subsequent reduction behaviors were investigated with simulated Shaft Furnace gases. The results showed that the compressive strength of HVTMP increased with the increase of roasting temperature and roasting time. Increasing roasting temperature and roasting time accelerated its subsequent reduction, however, the reduction rate decreased when the pellets roasted at 1250 °C were used. The roasting conditions of oxidized pellets had a slight effect on the phase compositions of the reduced pellets. The severest reduction swelling was observed when the pellets roasted at 1050 °C were adopted. The abnormal swelling could be suppressed by increasing the roasting temperature and roasting time. Moreover, abnormal swelling was caused by the forming of a large number of metallic iron whiskers during gas-based direct reduction. A conceptual diagram was formulated to describe the swelling mechanism at different roasting conditions. In practical industrial production of HVTMP, the roasting conditions should be optimized as far as possible to improve the reduction swelling under the prerequisite of meeting the compressive strength of the HVTMP smelting in the gas-based Shaft Furnace. This study aims to provide both theoretical and technical basis for the effective utilization of HVTM in either blast Furnace or Shaft Furnace.

  • Fundamental Study on Application of Gas-Based Shaft Furnace Direct Reduction Process to High Efficiency and Clean Utilization of Paigeite
    Advanced Materials Research, 2011
    Co-Authors: Zhao Cai Wang, Mansheng Chu, Jue Tang, Qing Jie Zhao, Xiang Xin Xue
    Abstract:

    The paigeite resources are abundant in China, but most of them are difficult to be utilized efficiently because of the current technical problems on industrial practice. It is necessary to perfected and innovated for comprehensive utilization of paigeite. The new process of gas-based Shaft Furnace direct reduction-electric Furnace smelting separation provides a new way to efficient and clean comprehensive utilization of paigeite resources. In this paper, the pellets are prepared from boron-bearing iron concentrate. The mechanisms of roasting, the rules of reduction, and the properties of reduction swelling are also investigated. And then the pellets after reduction are smelted and separated in electric Furnace to study the properties of products and analyze the feasibility and superiority of new technique. The results showed that boron-bearing iron concentrate is a kind of good raw material for pelletizing process. The properties of boron-bearing pellets after roasting for 20 min at 1200°C could meet to the requirements of gas-based Shaft Furnace direct reduction process, which exhibited fast reaction rate, good reduction swelling properties and high compressive strength both before and after reduction. With the new process, the efficient separation of boron and iron can be realized. The high boron grade and high activity of boron-rich slag obtained from new process can be used directly in boric acid manufacture. The new process shows excellent tech-economy feasibility to achieve efficiency and clean comprehensive utilization of paigeite resources.

Wei Li - One of the best experts on this subject based on the ideXlab platform.

  • Influence of roasting characteristics on gas-based direct reduction behavior of Hongge vanadium titanomagnetite pellet with simulated Shaft Furnace gases
    Powder Technology, 2017
    Co-Authors: Wei Li, Mansheng Chu, Guiqin Fu, Nan Wang, Miaoyong Zhu
    Abstract:

    In the present work, the correlations between roasting characteristics of Hongge vanadium titanomagnetite pellet (HVTMP) and its subsequent reduction behaviors were investigated with simulated Shaft Furnace gases. The results showed that the compressive strength of HVTMP increased with the increase of roasting temperature and roasting time. Increasing roasting temperature and roasting time accelerated its subsequent reduction, however, the reduction rate decreased when the pellets roasted at 1250 °C were used. The roasting conditions of oxidized pellets had a slight effect on the phase compositions of the reduced pellets. The severest reduction swelling was observed when the pellets roasted at 1050 °C were adopted. The abnormal swelling could be suppressed by increasing the roasting temperature and roasting time. Moreover, abnormal swelling was caused by the forming of a large number of metallic iron whiskers during gas-based direct reduction. A conceptual diagram was formulated to describe the swelling mechanism at different roasting conditions. In practical industrial production of HVTMP, the roasting conditions should be optimized as far as possible to improve the reduction swelling under the prerequisite of meeting the compressive strength of the HVTMP smelting in the gas-based Shaft Furnace. This study aims to provide both theoretical and technical basis for the effective utilization of HVTM in either blast Furnace or Shaft Furnace.

Chai Tian-you - One of the best experts on this subject based on the ideXlab platform.

  • Simulation Platform for Optimal Operation and Control of Roasting Process in Shaft Furnace
    Journal of Northeastern University, 2009
    Co-Authors: Chai Tian-you
    Abstract:

    Determining the technological indices of the roasting process in Shaft Furnace is difficult in not only the online measurement but also the modeling of their nonlinear and strong-coupling dynamic behavior in relation to the outputs from control loops to describe exactly the complexity that the process in varying with boundary conditions.To solve the problems of optimal operation/control of the roasting process in Shaft Furnace,a hardware-in-loop simulation(HILS) platform is developed with openess and modularity.It adopts the optimal operation/control strategy which is a two layered structure,i.e.the optimal operation layer and conventional control layer.The modules of the platform include mainly the optimal operation system,process monitoring system,programmable logic controller(PLC),virtual instruments and actuators,virtual plant system.Seamless integration features all the modules and their communication signals consist with in-site actual ones.Experiment results show the effectiveness of the platform.

  • Product Quality Monitoring System for Roasting Process of Shaft Furnace
    Journal of Northeastern University, 2007
    Co-Authors: Chai Tian-you
    Abstract:

    In the hematite ore roasting process of a Shaft Furnace,the product quality index,namely the magnetic tube recovery rate(MTRR),is difficult to be measured on-line or in real time.Therefore,a quality monitoring system is developed on the basis of RBF neural network and expert system,involving a MTRR prediction model and a product quality diagnosis model.Practical applications show that the proposed system can timely predict the MTRR with great precision and well diagnose the product quality.Furthermore,the way to adjust relevant parameters is suggested for the process to avoid the unqualified products.As a result,the MTRR is increased by 2% with the qualified product improved 50%,thus the product quality of the roasting process of Shaft Furnace can be efficiently guaranteed.

  • Intelligent Hybrid Prediction Method of Reducing Zone Temperature in Shaft Furnace
    2007 2nd IEEE Conference on Industrial Electronics and Applications, 2007
    Co-Authors: Yan Ai-jun, Chai Tian-you
    Abstract:

    The temperature of the reducing zone in the Shaft Furnace roasting process is a key controlled variable, but it's hard to be measured continuously. In this instance, an intelligent hybrid prediction model is developed to predict the temperature punctually based on the neural networks and case-based reasoning. This model consists of five modules: a data collection and data processing module, a decision-making module, a prediction module, an online modified module and an effect estimating module. The whole model's framework, the main function of each module and the implementation of the algorithms are discussed. Applications to a Shaft Furnace roasting process show that the model is effective in both normal and abnormal operating conditions. The obvious benefits of it are low maintenance expense, good real time character, high reliability and perfectly precision.