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Influence of Setting Accelerating Agents on Properties of Colloidal Alumina Bonded Corundum Castables

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China's Refractories 2020年第1期29卷 31-35页

作者： ZHANG Xiaohui yu xingguo WANG Baoyu ZHU Boquan Sinosteel Luoyang Institute of Refractories Research Co. Ltd.Luoyang 471039China Jiangsu Chianaref Refractory Co. Ltd.Yixing 214266China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China

In order to improve the flow ability and early-stage strength of colloidal alumina bonded corundum castables,the colloidal alumina with 20%of solid content was used as the binder,and tabular corundum aggregates and fines,and active alumina micropowder CL370 as the main starting *** of setting accelerating agents(magnesia fines and sodium meta-aluminate)on the linear change rate,the modulus of rupture and the microstructure of corundum castables after different heat-treatments were *** results show(1)cement bonded corundum castables have the highest modulus of rupture after 24 h of demolding,and colloidal alumina bonded corundum castables have the lowest one;both magnesia fines and sodium meta-aluminate can improve the strength after 24 h of demolding;(2)after firing at 1000℃for 3 h,the modulus of rupture of all specimens decreases,even lower than that after 24 h of demolding;(3)after firing at 1600℃for 3 h,the castable specimen added with 0.1 mass%magnesia fines has the highest modulus of rupture;the tabular phases appear interwovenly in the specimen;(4)taking the comprehensive properties into account,0.1 mass%of magnesia fines is appropriate,and the addition of sodium meta-aluminate shall be lower than 0.3%.

关键词： corundum colloidal alumina setting accelerating agent magnesia fines sodium meta-aluminate

Influence of Dispersants on Flow Ability of Colloidal Alumina Bonded Corundum Castables

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China's Refractories 2019年第4期28卷 26-30页

In order to make corundum castables satisfy more severe service conditions in high temperature industries,colloidal alumina due to the same main component with corundum castables was introduced for a pure binding *** influence of three dispersants(citric acid,FS10 and urea)on the flow ability of colloidal alumina bonded corundum castables was researched to choose a suitable dispersant for solving the shaping *** order to further understand the influence of dispersants on the flow ability and the mechanism,the rheological property and Zeta potential value of the colloidal aluminadispersant system and the matrix-colloidal alumina-urea-water system were *** results show the castables added with the urea have the best flow ability,and the appropriate addition of the urea is 0.5%.

关键词： corundum castables colloidal alumina dispersant citric acid FS10 urea rheological property Zeta potential

Suggestions for Sintering Technologies of High Cr_2O_3 Bearing Refractories Based on Thermodynamic Calculation

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China's Refractories 2012年第4期21卷 22-26页

作者： QIAN yuejin yu xingguo JIANG Mingxue LI Liusheng The Department of Material Science and Engineering Luoyang Institute of Science and Technology Sinosteel Luoyang Institute of Refractories Research Co. Ltd. The School of Materials Science and Engineering Xi'an University of Architecture and Technology

Cr2O3 can be sintered well at 1500℃ in carbonembedded condition or H2 atmosphere. But the high chrome bearing refractories can not reach densification when sintered at 1 700℃ .for 10 h in weak reducing atmosphere formed by the combustion of fuel, and its ap- parent porosity is about 18%. The high chrome bearing refractories are mainly used in coal gasifiers. The temperature in the furnace is about 1 500℃ and the products are H2 and CO, which are just the sintering conditions of the dense chrome refractories with apparent porosity less than 10%. The high chrome bearing refractories used in coal gasifiers may be sintered again and then shrink, destroying the gasifier lining. The thermodynamic calculation shows that it is safe about the high chrome bearing refractories used in gasifiers. It is also explained that the high chrome bearing refractories can＇t be sintered densely in weak reducing atmosphere formed by the combustion of fuel. The new sintering technologies can be used to improve the bulk density of the high chrome bearing refractories.

关键词： high chrome bearing refractories sinte-ring reducing atmosphere thermodynamic calculation bulk density

Optimization and Application of Corundum-spinel Purging Plugs for Refining Ladles

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China's Refractories 2015年第4期24卷 39-41页

作者： yu Lingyan yu xingguo ZHANG Xin Sinosteel Luoyang Institute of Refractories Research Co. Ltd.

Corundum - spinel purging plugs were optimized through adjusting the formulation and the particle size composition of starting materials to prolong the service life of purging plugs for a 60 t refining ladle in a steel plant. Th.e optimized formulatioa is 30 mass% tabular corundum （6 - 3 mm ） , 20 mass% tabular corundum （3-1 ram）, 22 mass% tabular corundum （1 -0.5 ram）＋ sintered spinel, 28% tabular corundum fines （0. 045 mm）＋ fused spinel （0. 045 mm）＋ bimodal α-Al2O3 micropowder ＋ Secar71 cement. The on-site results show that the plug can achieve an obviously long service life of 18 cycles, saving cost greatly.

关键词： ladles purging plugs slit physical properties

Properties,Performance and Quality Control of Recycled MgO-C Bricks

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China's Refractories 2008年第3期17卷 10-13页

作者： TIAN Shouxin YAO Jinfu WANG Jing yu xingguo yu Lingyan Baosteel Research Institute Shanghai 201900 China Sinosteel Luoyang Institute of Refractories Research Co. Ltd. Luoyang 471039 China

Properties, section structure and service results of recycled MgO-C bricks and new MgO-C bricks for ladle slag line of Baosteel were analyzed and compared, and the measures of improving stability and quality of recycled MgO-C bricks were summarized. The results show that：（1） High quality recycled MgO-C materials can be produced by scientific, meticulous and strict management for every process such as dismantling furnace, selection, removing impurity and slag, stacking and homogenization ; （2） Using high quality recycled materials and reasonable production technique, recycled MgO-C bricks with better properties and service efficiency than those of new MgO-C brick can be produced; （3） Service efficiency of recycled MgO - C bricks is good because of its high density, good oxidation resistance and reasonable structure.

关键词： Magnesia-carbon brick Recycling Re-production

圆砾泥岩复合地层泥水盾构下穿建筑物施工技术

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都市快轨交通 2016年第2期29卷 57-60,70页

作者：于兴国中铁十六局集团有限公司北京100018

泥水盾构机在圆砾、泥岩复合地层中掘进时,容易发生泥浆管、盾构机前仓进渣口堵塞(堵管堵仓)的现象,引起前仓压力波动,施工风险急剧增加。通过对盾构泥浆性能进行优化,降低堵管堵仓发生的概率;通过设定合理的前仓压力,优化掘进参数,保... 详细信息

泥水盾构机在圆砾、泥岩复合地层中掘进时,容易发生泥浆管、盾构机前仓进渣口堵塞(堵管堵仓)的现象,引起前仓压力波动,施工风险急剧增加。通过对盾构泥浆性能进行优化,降低堵管堵仓发生的概率;通过设定合理的前仓压力,优化掘进参数,保证开挖面的稳定,有效控制建筑物变形;之后选取正确的材料和施工工艺,利用同步注浆和二次补浆,有效控制地层和建筑物后续变形;同时利用信息化管理技术,采用自动化监测和信息化管理平台,使地下与地上联动,及时调整施工参数,更加有效地控制了建筑物沉降,为盾构机安全顺利下穿建筑物提供有力保障。

关键词：轨道交通盾构圆砾泥岩下穿建筑物泥浆性能掘进参数壁后注浆