On the walls of reed to environmental consultation process of rapid firing

Abstract: This paper describes the production process of the wall blank formulation, slurry parameters, molding, biscuit firing, glaze, glaze and other factors in six arts rapid firing of the product, emphasizing the promotion of technological improvements The rapid firing of the product, and further reflects the rapid firing of the importance of environmental protection section of students.

Paper Keywords: wall, rapid firing, environmental protection and energy saving
0 Introduction
As the world's industrial economic development, the rapid increase in population, the unlimited human desire and the production life of the uncontrolled rise. World Climate facing more serious problems, increasing carbon dioxide emissions, global climate change seen on catastrophic. Has been serious harm to human health and safety of the living environment and the end of .2009. Copenhagen Climate Change Conference held in low energy consumption, low emission, low-carbon economy, marked by increasingly become a consensus of all mankind. Similarly, the present ceramic enterprises should also face the challenge of global climate issues. At the same time the efforts have been made by Kai, the use of advanced production technology to achieve energy saving purposes. within the wall of the rapid firing of ceramic enterprises of today's commonly used as a production process, a able to reduce energy consumption, improve economic efficiency of enterprises, on the other hand can achieve environmental and social benefits. With the development of the industry, ceramic enterprises more attention to improving production technology, improve production efficiency and further realization of environment protection and energy.

A fast burning formulation blank
(1) The principle of selection of raw materials. As to maximize the amount of barren material to minimize the firing shrinkage, organic content, as well as the amount of clay and carbonate, the premise is to ensure that green strength. This product can reduce the deformation rate, is conducive to rapid firing process.

(2) the choice of clay. Try to use plastic, burn little to lose, a good solution plastic raw materials. This reduces the amount of clay. Necessary to balance the selection of a high-alumina clay, alumina ratio. Control the flatness of the low aluminum content is easy to make green body in the firing process of deformation defects, AI20 content of the best control in 18% -21%.

(3) the choice of fast burning material. May bring some pyrophyllite, diopside and wollastonite and other chain, needle-like structure of the material, which is characterized by a small loss on ignition. Linear shrinkage and the shrinkage is small, fast heat conduction, the sintering temperature low, especially suitable for fast firing process requirements.

(4) the choice of auxiliary material flux. In addition to diopside and wollastonite, but also could be introduced as part of limestone. Limestone are fired for anti-rejection can reduce the swelling green body shrinkage.

(5), potassium and sodium content of clay in general is enough, if necessary, introducing a small amount of feldspar of raw materials.

(6) formula for example. Recipe fast firing reflected in the easily oxidized, easy to humidity and heat and fast, easy to dry and crack. Billet blow drying, the lower the sintering temperature. All kinds of examples of mineral composition range of formulas in Table 1 - Table 3 (Formulation Plant information taken from the Universal Minqing).



2 mud Parameters
To ensure proper thixotropic mud, good suspension, water as low as possible, liquidity as well as possible, typically B = 3 ~ 5, 1.6 ~ 1.8g/ear between mud weight, mud a 250 mesh stiffness 6% 8% sieve, and make mud iron work. powders to lead l2 ~ 14 mesh, fine some good.

In short. Formulation of the raw material as much as possible. This change does not affect certain materials too, increasing the stability of the formulation to improve stability of the product formula is generally composed of 40% -50% clay, 50% of barren material a 6O%, pyrophyllite can be viewed as a barren material.

3 Forming
Molding pressure to ensure that the case of green strength as small as possible. And pressure to both sides. This is conducive to drying and oxidation of exhaust.

Links to Research Papers Download http://www.hi138.com 4 unglazed
Kiln width 2.95m, biscuit firing cycle 33 ~ 35min, into 8 slices per minute, gas for the cold gas. Drying 6-7min, structure, separately for the upper and lower heat and humidity and so improve the drying efficiency, drying up and down does not avoid all, cracking a dry, while avoiding the hot air flow from the upper and lower sides of the furnace. lead to edge two brick kilns in the middle of dry and crack can be set to block the fire board and block firewall. Dominated the first half of the gas heating, mainly the latter part of the kiln waste heat energy, not enough can be added through the stove flue gas and hot air to achieve control, respectively, first half of the positive pressure dry to heat up the main row wet, giving the dry and moisture can allow some people to re-dry kiln back guarantee kiln moisture to warrant the surface to dry too quickly, resulting in dry and crack. WetlandsSweat the second half for the negative. This structure, high efficiency, dry less than 1% residual moisture, ensuring billet heating section is not fried.

For wide-body kiln, each section of the kiln length is shorter, the density can be increased burner to ensure that the heat for about every section of 1.8m, the full oxidation oxidation stage, high temperature section deformation. Unglazed appropriate higher temperature, total number of responses to minimize the oxidation of the glaze kiln exhaust, to avoid the glaze bubbles and pinholes. reduce the glaze kiln sintering the green body reaction, to avoid deformation of glaze firing, glaze firing speed in favor ..

Quench and cooling section is the best frequency pumping hot air automatic control. Split air furnace can reduce wind. Fast firing reflected in the rapid and efficient drying, oxidation, cooling on full utilization of the furnace.

5 glaze
(1) end of the glaze, so if you do not consider the flooding, due to lower sintering degree, this wide range of firing, which will help to reduce chromatic aberration. Fineness finer, 325 mesh sieve 1% o ~ 2% o.

(2) CMC, sodium tripolyphosphate to use good quality. Kaolin reconciliation to ensure the plastic properties of viscosity, short end of the glaze to have a wide range of firing. Good viscosity and a low thixotropy and reasonable moisture. This can promote billet and the bottom of the question with the glaze, not easy to peel glaze, pour the glaze from the hole is not easy, not easy to produce color.

(3) surface glaze, began to have a higher melting point, the appropriate fineness thicker, a good high-temperature leveling, good drainage properties, wide firing range, good thermal stability. This is to ensure the rapid firing and Bu Zhiyu the pinhole, the glaze bubbles and shiny because of bad drainage and poor Erzhi pinholes, orange peel and post-cracking. face reflected in the high rapid firing the glaze before the melting point (put the appropriate granularity may also improve surface enamel before melting point, increase the exhaust resistance), good high-temperature fast leveling, drainage and quick drying area.

(4) Huayou, ink to be able to all through 250 mesh, 250 mesh screen and Huayou have good lubricity, reduce the dip net, good suspension, and corrosion resistance, good moisture. Reduction glaze, glaze firing to reduce drying time can result in poor drainage and poor gloss glaze pinhole. To strengthen the drying effect, if necessary, about one thousandth of the glaze by adding urea. Can greatly speed up the drainage process. Huayou fast burning reflected in the rapid dry to reduce the glaze.

6 glaze firing
Cycle 31 ~ 33min. Kilns width 2.65m, into the 7 per minute, less into a cross-section helps to reduce the temperature, to avoid chromatic aberration. Burner set as front, extended oxidation section, to avoid glaze bubbles, pinholes, but also avoid heating up too fast because of the back due to deformation. cooling process of cooling and cook on the same process.

7 rapid firing in the production limitation
Although rapid firing within the wall to improve production efficiency and promote green energy has its advantages. But its limitations should also be factors to consider and face. Mainly in the following areas:
(1) the selection of raw materials, has its limitations. And compared with normal firing. Fast firing more stringent requirements in raw materials. In this way, potentially will increase the cost of the product: And, some raw materials is not very easy to find.

(2) the difficulty of control of the process. Slurry performance to be stable after the spray granulation formulations to ensure the stability of stock. To reduce the possibility of distortion products. After the spray granulation of powder are the same hard water, particle size distribution is difficult by the ideal preparation, resulting in rapid firing deformation. Requirements of the furnace fuel (gas or oil) as the pure, high heat value and uniform heat, the temperature difference as small as possible to ensure the temperature and firing time depends mainly on manual control and a more non-mechanical automatic control.

8 Conclusion
The rapid firing within the wall is the current ceramic enterprises to promote a growing technology. Fast firing ceramic enterprises to develop and comply with them enormous economic benefits. Ceramic enterprises enjoy the rapid firing technology to their benefit at the same time. Also responded to the country's policy on environment protection and energy. Will increasingly be more rapid firing of ceramic companies to accept. Therefore, reasonable process optimization (process parameters of each enterprise are different), will be conducive to fast Yaki-Yaki into, the enterprise will be more conducive to saving and environmental protection . Links http://www.hi138.com Research Papers Download