The hot load deformation tests of four kinds of insulating fireclay bricks were carried out using a high temperature creep furnace from Sinosteel Luoyang hlstitute of Refractories Reseorch Co. , Ltd. The testing load ...The hot load deformation tests of four kinds of insulating fireclay bricks were carried out using a high temperature creep furnace from Sinosteel Luoyang hlstitute of Refractories Reseorch Co. , Ltd. The testing load was fixed at 0. 069 MPa and the total testing time was with- in 6 h including the holding time of 1.5 h. The hot load defi〉rmation process of insulating fireclay bricks can be divided into three steps ： （ 1 ） expansion step from room temperature to RUL Tmax;（ 2 ） quick shrinkage step be- tween. RUL T and Ttest; 3 ） relatively slow shrinkage step during holding process. The deformation rate at the beginning of holding process （D0h） should be controlled withi, ＋0. 1%. The hot load deformation testing tem- perature of insulating fireclay bricks was optimized as the value of RUL T plus 220℃.展开更多
1 Scope This standard specifies the classification, technical requirements, test methods, quality appraisal procedure, packing, marking, transportation, storage and quality certificate of fireclay refractory mortars.
This standard specifies the classification, shape, dimension, technical requirements, test method, inspection rules, packing, marking, transportation, storage and quality certification of fireclay refractory bricks fo...This standard specifies the classification, shape, dimension, technical requirements, test method, inspection rules, packing, marking, transportation, storage and quality certification of fireclay refractory bricks for hot blast stove.展开更多
This standard specifies the classification, brand, shape, dimension, technical requirements, test methods, quality appraisal procedures, packing, marking, transportation, storage, and quality certificate of fireclay r...This standard specifies the classification, brand, shape, dimension, technical requirements, test methods, quality appraisal procedures, packing, marking, transportation, storage, and quality certificate of fireclay refractory bricks.展开更多
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packing, transportation, storage and quality certificate of low porosity fireclay bricks for glass melting f...This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packing, transportation, storage and quality certificate of low porosity fireclay bricks for glass melting furnace.展开更多
1 Scope This standard specifies the technical requirements, test methods, quality appraisal procedure, packing, transportation, storage, and quality certificate of fireclay brick and semi-silica brick for coke oven.
Effects of different heat treatment temperatures on properties of Chinese calcined flint clay based plastic refractories were investigated using Chinese calcined flint clay as starting material, aluminum sulfate and f...Effects of different heat treatment temperatures on properties of Chinese calcined flint clay based plastic refractories were investigated using Chinese calcined flint clay as starting material, aluminum sulfate and fireclay as binding system. The results showed that with temperature rising, Chinese calcined flint clay based plastic refractories shrinked firstly and then expanded. The modulus of rupture （MOR） and the cold crushing strength （CCS） inereased firstly and then decreased from 110 ℃ to 600 ℃ , then increased obviously. Thermal expansion coefficient increased from 110 ℃ to 760 ℃, decreased from 760 ℃ to 1 300 ℃ , and increased from 1 300 ℃ to1500 ℃.展开更多
The variation in bedding thickness of the weak immediate floor has long been a challenge in the lllinois basin coal mines when it comes to floor stability. The vertical thickness of the immediate floor is not constant...The variation in bedding thickness of the weak immediate floor has long been a challenge in the lllinois basin coal mines when it comes to floor stability. The vertical thickness of the immediate floor is not constant throughout the mines and can vary over short horizontal distances. The biggest misconception from a design standpoint is to use the maximum or average thickness found from core logs taken from various locations on the mine property. The result of this practice is oversized pillars in the areas where the weak immediate floor has thinned vertically. This over-design leaves coal in situ which could have otherwise been extracted. This paper presents a plane strain numerical model to illustrate the effect of a change in bedding thickness of a weak immediate floor across one or two coal pillars. The floor bearing capacity of the variable floor below each pillar where then compared to the consistent floor. The results show that the varying bedding thickness of weak underclay has an impact on the bearing capacity of the floor. Geometrically with the decrease in bedding thickness for constant pillar width, the B/H ratio increases exponentially. The influence of varying bedding thickness on the floor bearing capacity is apparent at higher B/H ratios. The floor bearing capacity under a single pillar is in variable floor model if the average thickness remains constant. For single pillar, the average of the bedding thickness can be considered and for pillars in a panel, and a safety factor has been proposed to take into account this change in bedding thickness.展开更多
文摘The hot load deformation tests of four kinds of insulating fireclay bricks were carried out using a high temperature creep furnace from Sinosteel Luoyang hlstitute of Refractories Reseorch Co. , Ltd. The testing load was fixed at 0. 069 MPa and the total testing time was with- in 6 h including the holding time of 1.5 h. The hot load defi〉rmation process of insulating fireclay bricks can be divided into three steps ： （ 1 ） expansion step from room temperature to RUL Tmax;（ 2 ） quick shrinkage step be- tween. RUL T and Ttest; 3 ） relatively slow shrinkage step during holding process. The deformation rate at the beginning of holding process （D0h） should be controlled withi, ＋0. 1%. The hot load deformation testing tem- perature of insulating fireclay bricks was optimized as the value of RUL T plus 220℃.
文摘1 Scope This standard specifies the classification, technical requirements, test methods, quality appraisal procedure, packing, marking, transportation, storage and quality certificate of fireclay refractory mortars.
文摘This standard specifies the classification, shape, dimension, technical requirements, test method, inspection rules, packing, marking, transportation, storage and quality certification of fireclay refractory bricks for hot blast stove.
文摘This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packing, transportation, storage and quality certificate of low porosity fireclay bricks for glass melting furnace.
文摘1 Scope This standard specifies the technical requirements, test methods, quality appraisal procedure, packing, transportation, storage, and quality certificate of fireclay brick and semi-silica brick for coke oven.
文摘Effects of different heat treatment temperatures on properties of Chinese calcined flint clay based plastic refractories were investigated using Chinese calcined flint clay as starting material, aluminum sulfate and fireclay as binding system. The results showed that with temperature rising, Chinese calcined flint clay based plastic refractories shrinked firstly and then expanded. The modulus of rupture （MOR） and the cold crushing strength （CCS） inereased firstly and then decreased from 110 ℃ to 600 ℃ , then increased obviously. Thermal expansion coefficient increased from 110 ℃ to 760 ℃, decreased from 760 ℃ to 1 300 ℃ , and increased from 1 300 ℃ to1500 ℃.
文摘The variation in bedding thickness of the weak immediate floor has long been a challenge in the lllinois basin coal mines when it comes to floor stability. The vertical thickness of the immediate floor is not constant throughout the mines and can vary over short horizontal distances. The biggest misconception from a design standpoint is to use the maximum or average thickness found from core logs taken from various locations on the mine property. The result of this practice is oversized pillars in the areas where the weak immediate floor has thinned vertically. This over-design leaves coal in situ which could have otherwise been extracted. This paper presents a plane strain numerical model to illustrate the effect of a change in bedding thickness of a weak immediate floor across one or two coal pillars. The floor bearing capacity of the variable floor below each pillar where then compared to the consistent floor. The results show that the varying bedding thickness of weak underclay has an impact on the bearing capacity of the floor. Geometrically with the decrease in bedding thickness for constant pillar width, the B/H ratio increases exponentially. The influence of varying bedding thickness on the floor bearing capacity is apparent at higher B/H ratios. The floor bearing capacity under a single pillar is in variable floor model if the average thickness remains constant. For single pillar, the average of the bedding thickness can be considered and for pillars in a panel, and a safety factor has been proposed to take into account this change in bedding thickness.
