Secondary drying method for white carbon black

Abstract

The invention relates to a secondary drying method for white carbon black. The secondary drying method comprises the following steps of: 1, drying white carbon black slurry for the first time by using a spray drying method, wherein the temperature of hot air required by drying is 450-480 DEG C, the drying time is 20-30s, and the temperature of tail gas obtained after the drying is 80-90 DEG C; 2, catching white carbon black powder by using a filter bag, and then, directly delivering the white carbon black powder into a pneumatic drying tower to be dried for the second time, wherein the white carbon black powder is obtained after the first drying, the temperature of hot air required by drying is 150-180 DEG C, the drying time is 30-50s, and the temperature of tail gas obtained after the drying is 110-120 DEG C; and 3, catching the white carbon black powder by using a filter bag, and then, packaging the white carbon black powder in vacuum, wherein the white carbon black powder is obtained after the secondary drying. The secondary drying method is adopted, so that the water content of the white carbon black powder is stably controlled below 2wt%, the production control difficulty is lowered, the quality of a product is improved, the production energy consumption is greatly reduced, and the production efficiency is greatly increased.

Description

technical field [0001] The invention relates to the technical field of white carbon black production, in particular to a method for secondary drying of white carbon black. Background technique [0002] White carbon black belongs to the silicon-based white reinforcing powder material, which is the general term for synthetic hydrated silicic acid and silicate, including precipitated SiO 2 , gas phase SiO 2 , CaO nSiO 2 , MgO nSiO 2 、Al 2 o 2 · nSiO2 2 Wait. Because they have properties comparable to carbon black and are white in appearance, they are collectively called white carbon black. [0003] In the production process of white carbon black, drying is a very important process. With the continuous advancement of production technology in the silica industry, the drying method of silica has also undergone tremendous changes. Box-type drying with high energy consumption and low efficiency has been eliminated. At present, spray drying and flash drying are mainly used. ...

AI Technical Summary

Problems solved by technology

This approach not only greatly increases production energy consumption and reduces production efficiency, but also the quality of the product is very unstable, and the large amount of heat energy contained in the exhaust gas cannot be effectively used, resulting in a very low energy utilization rate, which is not in line with national and corporate environmental protection and energy conservation. and low-cost high-yield development requirements

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