The overall requirements of the granulator used in the calcium carbonate industry are high thermal efficiency, low energy consumption, simple configuration, convenient control, small footprint, and safe and hygienic operating environment. At present, the more commonly used high-efficiency mixing granulators in the inorganic salt industry are: rotary tube dryers, rotary indirect heating dryers, disc continuous dryers, and air dryers (also divided into pulse airflow, airflow rotation, and positive and negative pressure). Level air drying), rotary flash dryer, rotary drum dryer, spray dryer (also divided into granulation, powder, centrifugal, pressure), vibration fluidized bed dryer, static vacuum dryer, hot air circulation oven , Rake type, paddle type vacuum dryer, boiling dryer (horizontal, vertical), etc.

These high-efficiency mixing granulators provide guarantee for product quality, but they all have the problem of exhaust dust collection. Due to the continuous increase of nano-scale products, the original particle size is getting finer and finer, and the potential moisture content of paste-like materials is increasing. In addition, the company is continuously developing in a large-scale and large-scale direction. Enterprises are eager to combine efficient granulators. Especially for some large-tonnage products, such as precipitated calcium carbonate, the current national production is more than 3 million tons, the annual production line lower limit is 10,000 tons, and the scale of 100,000 tons requires five sets of high-efficiency mixing granulators. A Guangxi enterprise plans to achieve 500,000. Tons. According to the current level of high-efficiency mixing granulators, no matter the floor area of the equipment or the "dust" collected by the exhaust gas after the product is dried, it is very large.

According to the pulse bag dust collector generally used in the industry at present, the operating environment is very harsh, and effective measures must be taken to solve it. Therefore, we hope that the equipment development unit will focus on solving two problems, one is the drying of paste-like fine objects with high water content, and the other is the industrial hygiene problem of exhaust dust collection after the objects are dried. Taking the calcium carbonate industry as an example, more than 200 enterprises nationwide have basically adopted rotary indirect heating dryers, disc continuous dryers, rotary tube dryers, etc. in the selection of efficient mixing granulators. Although the production efficiency has been met, The energy consumption and exhaust dust collection are not ideal. When entering a calcium carbonate enterprise, they are covered with a layer of white calcium carbonate powder from the ground to the roof, and even a white layer on the tables and chairs in the office. There are management issues, and the more important thing is that the "dust" collected by the exhaust gas after drying is not enough. Recently, the industry has introduced dust removal equipment produced by DuPont, which basically solved the problem.

Therefore, the combined high-efficiency mixing granulator should include: providing heat source equipment, first- and second-level high-efficiency mixing granulators, and exhaust gas “dust” equipment. It is hoped that equipment manufacturing and research units will have high thermal efficiency, low energy consumption, simple configuration, Convenient to control, etc., to work on the combination of efficient mixing granulators, to serve others, to develop themselves. If the drying problem in the calcium carbonate industry is solved and the equipment is efficient and environmentally friendly, the drying problems of other varieties will be solved.