(School of Materials, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China) The ratio of the average pore size and the maximum pore size of the maximum pore size bubble was tested to obtain high-performance foam glass. The test results show that the organic addition of 2./. is uniformly coated on the glassy mixed powder to improve the fluidity of the powder, the natural bulk density and the foaming uniform addition of 2% of the stone enamel foaming agent also significantly improve the foam glass. The uniformity of foaming and the average pore diameter of 1 pre-compression molding have little effect on the average pore diameter of the foamed glass, but can improve the existence of local atmospheric pores.
Key solid: foam glass coated foaming agent pre-compression molding The foam is separated from the main raw materials, such as waste and various phase-rich materials, i turn foaming agent, mouse booster, etc. It is formed by melting, foaming and annealing to form a porous material filled with numerous uniformly closed bubbles. It has the characteristics of small density, low thermal conductivity, corrosion resistance, good thermal insulation and sound insulation performance, such as thermal insulation materials for petrochemical and cold storage, high-rise building insulation materials, and good environmental sound absorbing materials.
In the production process of foam glass, there are often many defects such as excessive pore size inside the foam glass and continuous pores, and even large holes, depressions, cracks, uneven surfaces, and uneven foaming. To improve the performance of foam glass, improve the existing production technology and improve the quality of foam glass, become the new research fund of foam glass: Jiangsu Natural Science Fund BK2005020) direction 丨31. 1 experimental experiment using domestically produced mixture below Adding organic acid and graphite powder with different ingredients to control the certain addition ratio, mixing and ultra-finening in special equipment, and refining the qualified mixture separately without pressure and 50, 100, 150, 200, 250, 272kN Under the pressure, the enthalpy 5 was formed and then sintered at a temperature of 860 t and annealed at 600 t, and cooled to room temperature in air to obtain a foam glass material having different properties.
2 Experimental results and discussion In order to improve the foaming properties of foam glass, the flowability of the pellets should be studied first, so as to achieve the uniformity of mixing of the components in the different proportions of the foaming mixture, so that the foam is uniform. Each of the same foam glass insulation materials.
2.1 The effect of organic acid coating on the foaming performance of glass powder is shown in Table 1) From the actual enthalpy of Table 1, the addition of organic scented coffee, the uniformity of the glass, and the influence of glass mixture modification on the foaming quality of foam glass The more obvious improvement is mainly manifested in the fact that the pore size becomes smaller, the pores are evenly enlarged, and the pores are inhibited, and the interconnected pores are prevented. This is because the fluidity of the glass frit particles is improved by the addition of the organic acid, and the viscous force between the particles and the particles is weakened, which increases the isotropy of the foamed glass during the foaming process, and promotes isostatic foaming.
Table 1 Effect of the amount of organic acid added on the foaming effect of the glass powder The temperature of the organic acid firing temperature retention time Experimental results The internal distribution size 'uneven pores> Some of the pores are also connected to each other.
The surface distribution of a small amount of scattered white fragmented sub-surface layer is a black shell layer, and the inner quality is mostly black porous foam glass, and the pore size is relatively uniform.
The color is darker, the pores are finer and more uniform, the aperture is about 1mm, and there is no abnormality in the interior of the air hole. The internal quality is very good.
The color is darker, the pores are fine and uniform, and there are individual abnormalities inside the large holes. The small pores around the large holes are flat and the rest is of good quality.
Since the glass powder is coated with an organic acid, one end of the long-chain alkyl group is chemically reacted or physically entangled with the organic polymer to firmly bond the mineral and the organic acid matrix to two materials having different properties; the other end and the mineral surface The functional group hydroxyl group and its metal salt chemically react to form a strong chemical bond, which greatly improves the affinity of the mineral filler and the polymer molecule, so that the angle of repose of the glass powder particles becomes smaller, and the fluidity improves the surface properties of the particles. Compared with the mixture without organic acid, the sintered foam glass has better performance, but the large pore analysis which is easy to produce abnormality after adding too much organic acid may be the result of agglomeration caused by excess organic acid.
2.2 The effect of graphite on the foaming properties of glass powder From 圄1, it can be seen that the temperature of the material is always lower than 400C. The endothermic reaction occurs when the temperature is 430400C. The process is mainly the endothermic reaction of the powder material from solid to high temperature melt, accompanied by exothermic reaction such as C+ 24C2, 2C+242CO, xC+y/22=CxOy. . At 600~700C, it is an endothermic reaction. It is apparent that the gaseous chlorocarbon decomposes CH-2H2+C and the reduction reaction CO2+C-2CO, and the exothermic reaction of the composite compound at 400C is still a foaming agent. The xC+y/22=CxOy reaction is caused by the interaction of a part of CO+1/22=CO2, CO+3H2=CH4+H. From the sintering process of the foam glass, it is exactly what we hope for from the solid state to the glassy state after 400C, to the final porous solid state, and there is always gas generation and bubble formation.
Table 2 shows the effect of the amount of graphite added on the quality of the foamed glass.
Table 2 Effect of the amount of graphite added on the foaming quality of foam glass. The amount of graphite added. The average pore size of the local pores/mm/the local atmospheric pore ratio/%. It is obvious from Table 2 that adding appropriate amount of graphite to the batch will make the foam glass. The foaming of the product is more uniform, and the uniform size distribution of the pore size can improve the quality of the foam glass to a certain extent.
Graphite plays a very important role in the formation of foam glass. When the amount of the foaming agent is insufficient, graphite is added, and the graphite particles are uniformly distributed in the glass powder to uniformly foam during heating. Each of the foaming units independently forms pore pores and is mutually inhibited and repelled so that the bubbles are relatively balanced, mutually closed, and evenly distributed. In the experiment, it was found that excessive addition of the blowing agent occurred in some areas and excessive foaming occurred. "The formation of large bubbles is absolutely avoided.
23 Mixing Density and Foam Glass Forming The mixture is filled in a specific mold, pre-compressed with different pressures to form a columnar preform, and then sintered to form Table 3).
Table 3 Effect of different prefabrication pressure on foam glass foaming quality Prefabrication pressure / kN block diameter / block height / bulk density / g / cm3) average pore diameter / mm local atmospheric pore diameter / from Table 3, pre-formed foam The average pore diameter of the glass is not much different from that of the pre-pressed molding, but the local atmospheric pore size is somewhat reduced and the local atmospheric pores gradually disappear with the increase of the pre-forming pressure.
3 Conclusions This topic is to study the foam glass mixture of a domestic enterprise. The study of the Chinese-style children's heart journal using the polished brick waste to prepare the package-type burn-free ceramic particles Hou Laiguang, Zeng Lingke, Wang Hui, Tax Anze, Liu Pingan Cheng Xiaosu, Jin Xueli (School of Materials, South China University of Technology, Guangzhou 510640, China). The ceramsite production process is simple and inexpensive to invest, and it also makes full use of the by-products of the ceramic industry. The ceramsite is a lightweight aggregate, and a small amount of expanded perlite is added. The sound absorbing material prepared by using cement and fly ash as a cementing material has good sound absorption effect, and no harmful substances such as fibers are a green environmental protection material.
Key solid: ceramic waste ceramic I grain free sound-absorbing material 0 Foreword With the rapid development of the ceramic industry, the output of ceramic I porcelain polished tiles has increased, and the waste generated has also increased dramatically. The production of 1 m2 of polished tiles roughly formed 2.1 kg of left-stone polished brick waste. For example, in the polishing production line with an annual output of 1 million m2 of polished tiles, about 21001 of polished brick waste is produced in the sea year. At present, there are at least several hundred or even dry-polished polished brick production lines in the country, which will generate millions or even thousands of tons per year. Tons of polished brick waste. Up to now, the treatment and utilization of polished brick waste is relatively low. Most of the landfills are used to make a large amount of waste residue occupy the cultivated land.
Fund Project: Production and Research Funding Project of Foshan Science and Technology Bureau Received: 2006-02- At present, China's ceramsite production is mainly divided into sintered and non-sintered two kinds of non-burning ceramsite production process is relatively simple, investment is small, cost Low and energy-saving have gradually attracted the favor of people at home and abroad. The bulk density of the non-sintered ceramsite is relatively large for the production of lightweight wall materials, and its density is too large, which restricts its development and application to some extent. In response to this issue, some researchers began research on sandwich-type ceramsite with polystyrene and other foams as the core. In this paper, the preparation method of encapsulated ceramsite which encapsulates expanded perlite with encapsulating material by using polished brick scrap, clay, cement and other auxiliary materials is studied, and its technical performance and application are studied.
1Experiment 11 Experimental raw material polishing brick waste The polishing brick waste material of a polishing wall and floor tile factory in Foshan is white in color, and the chemical composition is shown in Table 1. The organic acid obtained by experiment can improve the fluidity of the foam glass mixture and realize the glass. The coating and modification of the powder improves the mixing uniformity and foaming uniformity of the mixture. When graphite is added as a foaming agent to the mixture, the foaming quality of the foamed glass can be significantly improved to make the pores of the foamed glass more uniform and dense. The pre-compression molding has a certain improvement on the foaming quality of the foamed glass, but has no significant effect on the improvement of the average pore diameter.
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