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In the glass melting furnace masonry in recent decades, the masonry method of the furnace cover is mostly made by the dipping method, and the dipping method is a masonry method that is required when the joint is very thin. The brick masonry surface is immersed in a soft refractory mud (mainly gas-hard mud) and then masonry. Worried about the cracking of the joint seam and the high-temperature combustion chamber wall with the danger of shrinkage and the brick column of the multi-face heated high-temperature part, it is better to build the brick by this method, but it should be noted that the brick shape is not accurate and will have the opposite effect.
If the glass factory requires the seam of the furnace cover to be about 1mm, the "staining method" must be used to achieve the brick joint requirements. During the construction and use of kiln masonry for several decades, we have built a lot of kiln in strict accordance with the "slurry method", but there are some degrees of brick-breaking phenomenon, and some kiln bricks and corners The mill is repeatedly ground, that is, it is quite flat, but it is found that the bricks are more powerful when it is baked. We have carried out repeated analysis, comparison and research on this phenomenon, and found that this "staining method" is misunderstood. Start with the function and function of the mud.
The function of the refractory mud is to bond the refractory brick masonry into a whole, which has good structural stability and air tightness, and can withstand various chemical and physical effects at high temperatures to ensure the safe and normal operation of the thermal equipment. Achieve high efficiency, longevity, low consumption requirements. Siliceous refractory mud is prepared from silica powder, silica brick powder, plastic clay, binder and admixture. The workability and bonding strength of siliceous refractory mud are adjusted by binders and admixtures, such as mineralizers and binders such as lime milk, iron scales and lignosulfonates used in the production of silica bricks to regulate their operations. Performance and physical properties. Mud has two distinct uses in masonry industrial kilns: filling the ash joints to make the masonry dense; and bonding the bricks and bricks together to form a whole. In view of these two uses, the basic requirement for building a furnace is to make the mortar full.
Based on decades of experience in the glass industry, we have summarized the functions and functions of siliceous mud into the following three types.
(1) The adhesion of mud at low temperatures. The high-quality silicon refractory mud is now finer in particle size. Most of them are made of ultra-fine silicon powder, ultra-fine silicon powder, ultra-fine silicon brick powder, and other auxiliary materials such as methyl cellulose. They have strong adhesion at low temperatures (such as van der Waals forces, etc., the size of van der Waals forces has a lot to do with the fineness of the mud, such as nanomaterials have qualitative changes). If the mud is too thin and the consistency is too thin, its adhesion is weak. If the mud is too thin and too thin, during the erection of the bricks, the mud is easily lost, and the upper mud is not full. The upper mud of the two bricks is not full to form a relatively empty brick joint, so that the adhesion of the mud formation is small. Since the upper mud is too thin and too thin, its physical adhesion is not enough. In the early stage of the kiln, the lower part is heated and expanded. Since the silicon brick is a poor conductor of heat, the upper temperature is low, the expansion is small, and the upper part is cracked, and the mud is added. The grip force between the entire bricks is not enough, so it is easy to "draw" the bricks. The mud used in the "slurry method" is thinner and thinner, so it is easy to "draw" the bricks in the early stage of the kiln.
(2) Low co-culture of mud at high temperatures. The mud forms a low eutectic point with the ultrafine powder, various excipients and binders at high temperatures, forming a whole between the brick and the brick. If the upper mud is small, the shape does not form a low eutectic point, and thus the integrity of the furnace cover is poor. In the past, when the siliceous refractory mud particles were coarse and the gradation was unreasonable, the mud did not form a low eutectic point between the bricks and the bricks. Therefore, when the furnace was dismantled, the slabs were still piece by piece and did not form an integral structure.
(3) The surface of the mud filled brick is uneven and makes it dense. In the actual production process of silicon tantalum bricks, there is slight deformation during the drying and sintering process, so the surface of the bricks is uneven, which is a realistic objective situation; and it is impossible for the glass factory to take all the bricks. Go out to grind (even if the silicon crucible brick is processed and ground again, the diameter of the grinding disc is more than the diagonal length of the brick; the grinding angle must ensure that the angle of the brick meets the design requirements, and the size of the brick body is formed. The rays are just in the center of the circle). If the “staining method” is used for masonry, the mud used is thinner and thinner, just like a layer of paint, which does not make the surface of the filled silicon brick uneven and dense.
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