Chlorination furnace lining and manufacturing method thereof

Abstract

The invention discloses a chlorination furnace lining and a manufacturing method thereof. The chlorination furnace lining comprises a lining body. The lining body sequentially comprises an outer cast layer (2) and an inner cast layer (1) from outside to inside, and the outer cast layer (2) and the inner cast layer (1) are attached. Both the outer cast layer (2) and the inner cast layer (1) are formed by mixing phosphate castable and ceramic fiber cotton in a cast mode. The manufacturing method of the chlorination furnace lining comprises the steps that firstly, an outer cast layer mold plate is arranged in a shell (3), then the castable of the outer cast layer is prepared, the castable is poured into the mold plate, and demolding is conducted after the castable is dried, so that the outer cast layer (2) is formed; secondly, the inner cast layer (1) is manufactured through the same method; and thirdly, hot air at the temperature of 50 DEG C, hot air at the temperature of 100 DEG C, hot air at the temperature of 200 DEG C, hot air at the temperature of 500 DEG C and hot air at the temperature of 800 DEG C are guided into a chlorination furnace for 72 hours, 24 hours, 12 hours, 6 hours and 4 hours correspondingly. According to the chlorination furnace adopting the lining, the failure rate in the production process is low, the repair cycle is greatly prolonged, the maintenance cost is greatly reduced, and the service life of the chlorination furnace is greatly prolonged.

Description

technical field [0001] The invention relates to a furnace lining, in particular to a chlorination furnace lining of chlorination titanium dioxide. Background technique [0002] At present, the chlorination method is the most commonly used method for preparing titanium dioxide, and the chlorination furnace is the core equipment for the preparation of titanium dioxide by the chlorination method. In the early stage of the preparation of titanium dioxide by the chlorination method, it is necessary to pass chlorine gas into the chlorination furnace to combine with titanium dioxide. Mineral raw materials react to produce titanium tetrachloride. The temperature in the reaction section of the chlorination furnace is close to 1000°C, and the pressure in the furnace is slightly negative. The lining of the chlorination furnace is severely washed by materials and chlorine gas, and the environment in the furnace is acidic and easily corroded. , The lining of the chlorination furnace play...

AI Technical Summary

Problems solved by technology

However, the inner lining of this structure and materials will have the following problems: firstly, there are many layers, and under the action of high temperature in the furnace, delamination will occur between layers, resulting in the inability of the entire inner lining to be sintered into a whole; secondly It is because the materials used in the lining of this structure are different and their thermal conductivity is high, resulting in a high thermal conductivity of the entire lining. When the temperature in the furnace is around 1000 °C, the thermal conductivity is 3.95W / m.k or so makes the heat insulation effect of the entire inner lining poor, and the shell temperature usually reaches above 150°C; secondly, the overall strength of the inner lining is low, and its compressive strength is generally lower than 35MPa; finally, it has a high-alumina refractory castable layer The inner lining of the structure has a high shrinkage rate under high temperature, which will cause cracks or gaps in the chlorination furnace during operation, so that high-temperature chlorine gas will escape from these cracks or gaps to the outer layer of the inner lining to corrode the shell. Affect the normal operation of the chlorination furnace; based on the above-mentioned problems, the failure rate of the lining of this kind of chlorination furnace is relatively high, thereby reducing the maintenance cycle and increasing the maintenance cost. At the same time, the life of the chlorination furnace will also be shortened

Images