The final product, ultrafine calcium carbonate, is obtained by calcining, digesting, carbonizing, surface treating and drying the limestone as raw material. After years of technological development, the production of ultrafine calcium carbonate has changed from the original energy consumption, labor intensity, and poor operating environment to a new process characterized by low energy consumption, semi-automatic production, and clean operating environment. What changed the situation? The answer is the use of spray drying technology.
In the process of producing ultrafine calcium carbonate, the drying process is undoubtedly the most important part of the whole process, and it is also the most energy consumption. Continuous research on superfine calcium carbonate, found in the drying section using spray dryer treatment, the effect is the most significant. Reduce energy consumption, improve the working environment, and most importantly, improve the quality of finished products. The following is to share the specific drying process of superfine calcium carbonate treated by spray dryer.
Centrifugal filtration out of the filter by beating, increase the fluidity. But...TPaste materials with less water have a larger consistency index and flow.
Sex is still poor. The problem of excessive resistance loss and difficult transportation of the feed pipeline caused by times has not been solved. We adopted the process of parallel flow of materials and hot air upward in the drying tower, and Dada shortened the feed line. At the same time, the residence time of the material in the tower is also increased by gravity. In this way, the drying tower itself becomes a separator, which has the effect of "flotation", so that a very small number of large particles settle to the bottom of the tower, ensuring the quality of the product.
According to the difference of superfine calcium carbonate, different problems are encountered in the process of designing the whole spray dryer. After the improvement of the original spray dryer and the selection of suitable drying equipment accessories, it has become the most suitable mechanical equipment for drying ultrafine calcium carbonate.
Atomizer: air flow type (adjustable three-flow air atomizer) is adopted, and the cake is added with self-suction function and air flow mixed type according to parameters such as material consistency.
Drying tower: after calculation, the tower height can be about 16m. Others: such as automatic control system, etc., can be designed according to the output and site layout.
The use of spray dryer treatment of ultrafine calcium carbonate, to achieve the current production requirements: closed, continuous, automated. The benefits are huge, the production intensity is greatly reduced, and the quality of the product has been greatly improved. Due to the design of the spray drying equipment, the hot air has been effectively used, and the energy saving is more false.