The drying of light calcium carbonate generally goes through two stages. The material is first mechanically dehydrated to a moisture content of about 30%, and then mechanically broken into uniform granules. After being added into the dryer, the drying process is performed after dispersion and heat transfer. At present, most of the drying equipments used in the calcium carbonate industry in China are widely used in other industries. These equipments are not designed for the drying of light calcium carbonate, because the light calcium carbonate drying has its specificity. The application manufacturer often suffers from huge economic losses due to the failure of the selection on the dryer equipment. For example, most dryers of light calcium carbonate manufacturers use rotary dryers with a length of more than 20 meters. Rotary dryers have the disadvantages of heavy equipment, low thermal efficiency, high energy consumption, and high maintenance costs. Frequently, product contamination due to overheat deformation and cracking of the flue pipe is caused, which seriously affects product quality.
Some manufacturers also use equipment such as chain dryers, belt dryers, and rotary flash dryers. These devices have a large footprint, large investment in equipment, and energy consumption in the production of light calcium carbonate. Large, maintenance complex and other issues. Because the above-mentioned dryer equipment is not specially designed for the production of light calcium carbonate, the manufacturer of light calcium carbonate causes a lot of inconvenience in the production and application, in order to solve the above equipment in the production and application process of light calcium carbonate. Defects, some domestic manufacturers to GZG series tube bundle dryer as a prototype, developed the use of heat transfer oil as a heating medium for calcium carbonate drying equipment - rotary tube dryer, and through the promotion of a part Application, the application of the device has a greater role in promoting the upgrading of light calcium carbonate drying process.
With the application of the rotary tube dryer in the production process, it has been found that after a period of time, the rotary tube dryer often suffers oil leakage failure, which leads to product contamination, the production will gradually decline, and the maintenance of the equipment is difficult. Finally, some application manufacturers simply abandoned the use of rotary tube dryers.
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