Material based on heat-resistant fiber made from power station fly ash

Gorlov, Yu. P.; Ustenko, A. A.; Sardarov, B. S.; Харитонова, Л. А.

doi:10.1007/bf00702272

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Bogdanovich factory made a trial batch of fibrous articles with a low shrinkage during heating which were established in the working layer of a soaking pit at the Hammer and Sickle Steel Plant. The scientific principles of the mechanics of failure of ceramics, and review data on their strength, have been published in [1][2][3][4][5][6].…”

Section: Discussionmentioning

confidence: 99%

“…The use of rigid unfired slabs or blocks is not possible because of the high (up to 5%) shrinkage of the goods in service. The use of prefired tiles [3] leads to further restrictions during preparation, which markedly complicates and boosts the cost of the production process.The aim of this investigation was to obtain unfired fibrous goods with a linear shrinkage of not more than 1.0-1.5% at 1100-1300~ with a sufficiently high installation (mechanical) strength in service.Specimens of fibrous articles were prepared by vacuum forming using water-body mixtures [4]. The fibrous material consisted of mullite-siliceous roll material MKRR-130 (GOST 23619-79) produced by the Bogdanovich refractories factory, and the bond consisted of a mixture of silica gel and polyvinyl acetate dispersion (PVAD) in a ratio of 9:1 (dry weight) which, as established previously [5,6], enabled us to obtain fibrous refractories with a high installation strength that was maintained in service, and with low apparent density and thermal conductivity.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Reduction of linear shrinkage in glass-fiber refractories during service

et al. 1983

View full text Add to dashboard Cite

666,762.1-494.017.620.192.52 In recent years in the Soviet Union and abroad more and more attention has been paid to the production and use of refractories based on fibrous insulating materials and articles. In Great Britain in 1967 the output of refractory fibers amounted to s million sterling; in 1977 the output increased to s million [1]. One of the most effective sites for the use of such materials (glass fiber products) is the working layer of the linings of heating equipment. Roll material or felt [2] is normally used, but in these cases, because of the erosion of the fibrous material, severe restrictions are placed on the rate of gas flow. The use of rigid unfired slabs or blocks is not possible because of the high (up to 5%) shrinkage of the goods in service. The use of prefired tiles [3] leads to further restrictions during preparation, which markedly complicates and boosts the cost of the production process.The aim of this investigation was to obtain unfired fibrous goods with a linear shrinkage of not more than 1.0-1.5% at 1100-1300~ with a sufficiently high installation (mechanical) strength in service.Specimens of fibrous articles were prepared by vacuum forming using water-body mixtures [4]. The fibrous material consisted of mullite-siliceous roll material MKRR-130 (GOST 23619-79) produced by the Bogdanovich refractories factory, and the bond consisted of a mixture of silica gel and polyvinyl acetate dispersion (PVAD) in a ratio of 9:1 (dry weight) which, as established previously [5,6], enabled us to obtain fibrous refractories with a high installation strength that was maintained in service, and with low apparent density and thermal conductivity. To reduce (compensate for) the shrinkage of fibrous articles during heating we used additives ensuring an expansion of the material at the appropriate temperatures.It is known [7]* that during the formation of magnesia spinel from alumina and magnesia there is an increase in volume caused by the lower density of the reaction product. The expansion of pressings from a stoichiometric composition of MgO and A1203 in the form of periclase and corundum reaches maximum values of 5% at 1300~ in 6 h and at 1400~ after 2 h, but at 1200~ it is quite high (about 3%). In this case there is an increase in the porosity. At 1300-1400~ the breaking up and expansion is about 13% (abs.) or about 40% (re1.).Cristobalitization of the quartz glass during heating leads to a significant expansion with an increase in the open porosity from 0.3 to 8.5% at 1400~In this case the degree of cristobalitization reaches 90%. With the addition of 0.65-1.0% Na20 (in the form of Na2CO 3) the temperature of cristobalitization of the fused quartz is reduced to 900~[8].The above suggests that the addition of mineralizing mixtures of A120~ and MgO to the batches for the fibrous materials using stoichiometric ratios or fused quartz premixed with 1% Na2CO 3 (0.65% Na20), as a result of embrittlement and increase in volume, leads to a reduction in the overall shrinkage of the goods.We also te...

show abstract

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Reduction of linear shrinkage in glass-fiber refractories during service

et al. 1983

View full text Add to dashboard Cite

show abstract

“…Considering the chemical composition of some industry solid wastes is similar to natural minerals, such as SiO 2 , Al 2 O 3 , CaO, MgO, Fe 2 O 3 , K 2 O, and Na 2 O, it is possible to try to make fibers from them. As early as the 1970s, the Soviet Union reported the short fibers made from fly ash and clay showed excellent fire resistance [ 3 ], which attracted extensive attention. At the same time, Japan, the United States and some European countries also carried out many studies on fly ash-based mineral fiber [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Study Progress on Inorganic Fibers from Industry Solid Wastes and the Key Factors Determining Their Characteristics

Zhang

Cheng

et al. 2022

Materials

View full text Add to dashboard Cite

Compared to basalt and glass fibers, the production of inorganic fiber from industry solid wastes is an effective method to not only save natural resources but also recycle waste resources. Because the preparation of the fibers requires high temperature treatment, the production process is associated with high energy consumption and high carbon emissions. How to resolve these problems is a current research challenge in this field. Herein, we reviewed the study progress on these fibers and further discussed the key factors determining their characteristics, including chemical composition, melt structure, and viscosity of melt. In production, the matching of solid waste blends containing enough total content of SiO2 and Al2O3, and a suitable amount of MgO and CaO, is beneficial to the structure control of the melt. The study found that the melt consisted of Q2 and Q3; and that Q3 content more than Q2 was more suitable for fiber production and its performance improvement. Such a melt structure can be achieved by controlling the degree of depolymerization and the temperature. New ultrasonic technology can shorten the homogenization time; its application is hoped to save energy and reduce carbon emissions. These conclusions will offer important guidance for the development of inorganic fibers from industry solid wastes in the future.

show abstract

Material based on heat-resistant fiber made from power station fly ash

Cited by 2 publications

References 0 publications

Reduction of linear shrinkage in glass-fiber refractories during service

Reduction of linear shrinkage in glass-fiber refractories during service

Study Progress on Inorganic Fibers from Industry Solid Wastes and the Key Factors Determining Their Characteristics

Contact Info

Product

Resources

About