Design of Raw Material Sintering for Alumina Oxide Factory
Abstract
The sintering process plays an important role in alumina oxide production. Appropriate design for the raw material sintering process of alumina oxide plant is essential to achieving good product quality. The theoretical basis and experimental basis of this process were studied, and the different operating parameters of the production process were optimized and the corresponding tests were carried out. The components in the bed of the sintering furnace were analyzed, the sintering curves were drawn, and combined with mathematical analysis, the optimal parameters of the furnace were selected. By controlling the change of temperature, CO and CO2 content in the sintering furnace, it is possible to make the sintering process reach the maximum efficiency and ensure the quality of the final product.
1 Introduction
Alumina oxide is the most important raw material for the manufacture of abrasive tools, grinding discs and other abrasive tools. As the dominant material for abrasive production, it accounts for about 70% of the mass fraction in the abrasive. Its powder particles are minute and have high plasticity, making it difficult to heat and sinter. Sintering of alumina oxide determines the performance of abrasive materials and the overall quality level of abrasive tools. The performance of alumina oxide sintering layer is directly related to the hardness and wear resistance of abrasive tools. Therefore, a reasonable sintering design scheme is the goal of producers and engineers.
2 Bed Design
Analysis of bed structure of sintering furnace is an important factor to get high quality product. The individual component of the bed contains alumina oxide sand, oxides, clay and other graphite diffusion medium. It is important to determine the composition and size of the sintering bed to ensure ample surface area for contact between the particles and improve the efficiency of the furnace gas. Generally, the bed should have a loose structure. The chemical particles of the bed should have a small size so that the chemical reaction between them can be accelerated. The size of the particles should also be as uniform as possible to ensure uniform heat transfer throughout the bed.
3 Kiln Temperature Control
Based on thermodynamic principles, scientific control of kiln temperature is an effective way to ensure the good quality of abused products. The sintering temperature of alumina oxide can range from 1700℃ to 2250℃. Too low or too high temperature will lead to poor sintering effect. Therefore, the sintering temperature should strictly follow the prescribed conditions. Firstly, the low temperature of alumina oxide reaching 1200℃ gradually increases the sintering temperature to 1700℃. The temperature needs to be applied in a 250℃ step, which increases from 1700℃ to 1900℃, 2150℃, and then remain unchanged until the end of the sintering process. In addition, there should be a 250℃ stability time for each temperature rising step to ensure that the temperature is stable The sintering process should also be carried out at constant pressure and vacuum to avoid thermal expansion and shrinkage of the raw materials.
4 Carbon Dioxide and Carbon Monoxide
For sintering, it is necessary to introduce proper amount of CO and CO2 into the furnace. Carbon monoxide helps to accelerate the chemical reaction, reduce the grain size and improve the sintering performance and strength of the sintered material. Carbon dioxide acts as a reductant and helps to produce carbon which has a high melting point which is beneficial to sintering. Too much CO and CO2 will lead to severe burning of the bed and will damage the quality of the product. In order to ensure the best possible sintering effect, the content of CO and CO2 should be strictly controlled during the sintering process.
5 Conclusion
The sintering process of alumina oxide is very important for achieving the required product quality. Through the above analysis, the influencing factors in the sintering process have been discussed, and an appropriate design scheme for the sintering process of alumina oxide has been proposed. The factors such as bed design, kiln temperature control, and carbon dioxide and carbon monoxide contents should be considered and optimized for the sintering process, in order to achieve maximum efficiency and product quality.
