I. silica gel project overview:
Inorganic silica gel is a kind of highly active adsorption material, which is usually prepared by reaction of sodium silicate and sulfuric acid and a series of post-treatment processes such as aging and acid bubble. Silica gel is an amorphous material, and its chemical formula is msio2.nh2o. Insoluble in water and any solvent, non-toxic and tasteless, stable in chemical properties, no reaction with any substance except strong base and hydrofluoric acid. Different types of silica gel have different microporous structures due to different manufacturing methods. The chemical composition and physical structure of silica gel determine that it has many characteristics that are difficult to be replaced by other similar materials: high adsorption performance, good thermal stability, chemical stability, high mechanical strength, etc.
II. Overview of silica gel belt dryer:
According to the water characteristics of silica gel, it can be known that it is mainly internal adsorbed water, so the drying process is relatively slow. In the drying process of silica gel, it is necessary to ensure that not only the drying temperature, but also the retention time can meet the requirements, otherwise the damage of silica gel will be serious if the drying speed is too fast. In the whole drying process of silica gel, the temperature in the front preheating section is slightly lower, and the mesh belt speed is faster, while that in the back drying section and heating can be increased, and the mesh belt speed is lower.
Three net belt dryers are connected in series to form preheating section, water evaporation section and material heating section. Due to the particularity of silica gel dryer, the temperature of the first dryer should not be too high, the control temperature is between 80-100 ℃, the mesh belt speed can be slightly faster, the temperature of the second dryer can be properly increased, the control temperature is between 100-120 ℃, the operation speed of the mesh belt can be properly reduced, the temperature of the third dryer can be gradually increased, the control temperature is between 120-140 ℃, the transportation of the mesh belt The line speed is lower.
III. project cases: