釉面砖釉面有针孔的分析和解决方案(Analysis+and+solution+of+glazed+t.doc

釉面砖釉面有针孔旳分析和处理方案（Analysis and solution of glazed tile with pinholes）釉面砖釉面有针孔旳分析和处理方案(Analysis and solution of glazed tile with pinholes) In this paper, the glaze pinhole of glazed tile is analyzed in detail, and the solution is put forward. Respectively from the blank, glaze, fuel, firing, four aspects are described. Keywords pinholes, billets, glazes, gas stations, kilns 1 Preface Youmianzhuan often pinhole (open bubble), prickly heat (open bubble), uneven glaze (wrinkle), dust and other defects. These problems seriously affect the quality of products, and reduce the quality of products. It is urgent to solve these problems. Now the author will analyze the causes of pinholes. The use of glazed frit glaze: light transparent, light white matte glaze and zirconium. General matte glaze will not have pinholes, even if there is a transparent glaze, but because it is transparent, looks is not obvious. Therefore, it mainly talks about the problem about light glaze hole zirconium glaze. The following are presented in the order of billet glaze firing (fuel), and solutions are provided for reference. Due to my limited level, I hope I can correct what is wrong. 2 the influence of blank on pinholes 2.1, the influence of raw material The raw material should be selected as much as possible with low loss of raw materials, so as to ensure that the amount of ignition loss of the production blank does not exceed the required range. General two times firing glazed tile burning loss remained at 9 below%. Special attention should be paid to the use of some high calcium sediment material, which can reduce the amount of wollastonite (cost reduction) and calcium carbonate (reduce the amount of burning). Sanshui newpearl Ceramics Co. Ltd has a very high calcium sand to replace wollastonite and calcium carbonate. 2.2 the influence of the fineness of the billet The fineness of the billet should be controlled within a certain range. Too coarse, the exhaust is not clean, the reaction is incomplete. The accumulation is not close, the surface of the body is rough, the gap is many, easy to smoke. When enamel burns, it is easy to produce pinholes. In general, the fineness of the two firing glazed tiles is maintained at: (3 ~ 3.5) g / 100mL, and the specific gravity is 1.700 +. 2.3, the influence of purity of the powder At present, many manufacturers use coal water slurry furnace spray drying tower to reduce production cost. Its working principle is: the ball milling to a certain degree of coal water slurry spray into the furnace combustion, the exhaust heat used to dry powder. If coal water slurry is not completely burned, carbon particles may be mixed with hot air into the spray tower. Therefore, hot air must be filtered. In addition, after the belt conveyor powder wear, mixed powder in the rubber particles will also have an impact on the glaze. 2.4 the influence of parison forming pressure In a certain range, the greater the forming pressure of the body, the greater the density of the pile, the less difficult to exhaust, leading to the organic matter of the body too much (Hei Xin) a plant 25 x 33 specifications brick molding pressure as shown in table 1: 2.5 effects of additives on billets Generally with additives are inorganic, and will not have much impact. 3 Influence of glaze on pinhole: Effect of 3.1 base glaze (make-up soil) formula The glaze as far as possible the use of calcined raw materials, such as burning, burning kaolin, calcined talc, calcined alumina clinker and soil. Check whether the material is fully calcined before use. The glaze does not allow the use of carbonate, such as calcium carbonate, barium carbonate, etc.. This type of chemical material that decomposes gases after burning. It contains a variety of possible components of raw materials instead of containing a single ingredient raw materials. Such as the use of wollastonite instead of silica and calcium carbonate, feldspar, talc frit used instead of burning as flux, with kaolin (porcelain stone) instead of quartz, alumina. The glaze fineness in general (0.5 ~ 0.7) / 100ml? The proportion of 1.820?. The practical formula: calcined clay (with Qidao clay) 55 + calcined alumina powder (containing quartz powder, the temperature is low (+ 6) zirconium white frit glaze with 24), plus some burnt talc, quartz, feldspar, lithium porcelain stone, reduce cost. After the recipe is adjusted, the cake will be fired, and the parameters such as burning loss, whiteness, coefficient of expansion and water absorption (degree of sintering) will be measured. 3.2 surface glaze (light zirconium white frit glaze) effect 3.2.1 fritted glaze As the zircon opacifying agent could improve the viscosity of high temperature glaze. Generally, the higher the viscosity of the glaze, the more pinholes will be; otherwise, the less. Glaze contains more basic oxides, barium oxide and boron oxide, resulting in surface tension is too large, gl。