Chrome bricks for sale in the first non-ferrous metallurgy furnace, gas slag furnace, with excellent resistance to steel slag outside the furnace, non-ferrous smelting slag, coal gasification slag and all kinds of glass liquid erosion ability. In recent 10 years, this kind of refractory began to get application in glass furnace, the place such as feeding mouth, because it can significantly extend the age of kiln, thus caused the attention of the glass industry.
The erosion rate of chrome brick increases linearly with the increase of erosion temperature, mainly because:
1. As the temperature increases, the proportion of small groups and silicon-oxygen complex anions in the glass solution increases, which accelerates the dissolution rate in the glass solution.
2. As the temperature increases, the viscosity of the liquid glass decreases and the free volume of the liquid glass increases, so that the average free path of motion increases and the diffusion rate increases, and the erosion of chrome brick by the liquid glass is accelerated.
3. When the temperature rises to 1550 ° C, it is oxidized at the gas-solid and liquid-phase interface, resulting in a rapid increase in the erosion rate, as evidenced by the yellow-green optically opaque glass at the interface.
If within 3 ~ 5h, the erosion rate will decrease rapidly with the extension of time. After 5h, the erosion rate decreases slowly and gradually tends to be stable, while it takes a long time to reach a constant erosion rate. The reason for such a change in erosion rate is that there are many connected pores in the chrome brick, along which the glass liquid can easily penetrate into the chrome bricks for sale at the beginning, leading to a relatively high erosion rate. With the extension of erosion time, the chrome-brick was densified near the contact interface with liquid glass, and the connected pores disappeared, forming an isolated porous structure. The isolated pores effectively prevent the penetration of liquid glass into the chrome brick and prevent the surface particles from falling off, thus reducing the erosion rate.
The effect of reducing atmosphere on the physical properties of chrome bricks for sale is mainly reflected in: low oxygen partial pressure inhibited the oxidation to chromium and hexavalent, which inhibited the mass transfer from evaporation to condensation, which was beneficial to the densification and sintering of high chromium bricks. At the same time, the formation of aluminum chromium solid solution, trivalent aluminum ion replacement trivalent chromium example caused lattice distortion, but also accelerated the densification sintering process; The increase of temperature and the acceleration of diffusion are also beneficial to the sintering of high chromium bricks. However, as the temperature rises to 1550℃, CO plays a leading role in the reduction of high chromium brick, which is reduced to form, and metal chromium, which is not conducive to the burning of high chromium brick. But in the air, the oxygen partial pressure is high, there is no reduction.
Chrome bricks for sale mainly used in coal chemical furnace, chemical industry furnace, rock cotton fiber furnace, garbage incinerator, melting furnace and other key parts of the furnace. The appearance size, physical and chemical index and use environment of this series of refractory bricks have reached the leading level of similar products. We have reached friendly cooperative relations with customers in many countries and regions. Welcome to consult and purchase. We will serve you wholeheartedly.
