The overall requirements for 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 most common high-efficiency mixing granulators used in the inorganic salt industry are: rotary tube dryers, rotary indirect heating dryers, disc continuous dryers, and air dryers (also divided into pulse air flow, air flow rotation, and positive and negative pressure. Air flow drying, rotary flash dryer, rotary drum dryer, spray dryer (also divided into granulation, powder, centrifugal, pressure type), vibration fluidized bed dryer, static vacuum dryer, hot air circulation oven , rake type, paddle type vacuum dryer, boiling dryer (horizontal, vertical) and so on.

These high-efficiency mixing granulators provide guarantees for product quality, but there are problems with tail gas collection. Due to the ever-increasing number of nano-scale products, the original particle size is becoming finer, the potential moisture content of the paste-like material is increased, and the company is continuously developing toward large-scale and large-scale production. The company is eager to combine high-efficiency mixing granulators. In particular, some large-tonnage products, such as precipitated calcium carbonate, currently produce more than 3 million tons nationwide, the production line has an annual production limit of 10,000 tons, and the 100,000-ton scale requires five sets of highly efficient mixing granulators. A company in Guangxi plans to get 500,000. Tons, according to the current level of high-efficiency mixing granulators, both the footprint of the equipment and the amount of “dust” collected after drying the product are large.

According to the pulse bag filter commonly used in the industry, the operating environment is very bad and must be taken to solve it. Therefore, we hope that the equipment development unit will focus on solving two problems: one is the problem of drying of paste-like fine objects with high moisture content, and the other is that the exhaust gas after the object is dried will receive “dust” industrial hygiene problems. The calcium carbonate industry is still used as an example. For more than 200 companies across the country, in the selection of high-efficiency mixing granulators, rotary indirect heating dryers, disc-type continuous dryers, rotary column dryers, etc. are basically used, and the production efficiency is satisfied. , Energy consumption and tail gas collection "dust" are not ideal, once into the calcium carbonate business, from the ground to the roof are covered with a layer of white calcium carbonate powder, even in the office table and chair is also a white, this aspect There are management problems, and what's more important is that the tail gas after drying does not pass “dust”. Recently, this industry has introduced DuPont's dust removal equipment and basically solved the problem.

Therefore, the combined high-efficiency mixing granulator should include: heat source equipment, first- and second-stage high-efficiency mixing granulators, and tail gas collection “dust” equipment. It is hoped that equipment manufacturers and research institutes will have high thermal efficiency, low energy consumption, and simple configuration. The article is easy to control, etc., make a fuss about the combination of high-efficiency mixing granulator, serve others, develop yourself. If the calcium carbonate industry's drying problem is solved and the equipment is highly efficient and environment-friendly, other types of drying problems will be solved.