The general requirements of granulator used in calcium carbonate industry are high thermal efficiency, low energy consumption, simple configuration, convenient control, small footprint, and safe and hygienic operation environment. At present, the more common high efficiency mixed granulator used in the inorganic salt industry includes rotary column drier, rotary indirect heating dryer, disc type continuous dryer, air dryer (pulse air flow, airflow rotation, positive and negative pressure two stage air drying), rotary flash dryer, rotary drum dryer, spray dryer. (it is also divided into granulating, powdery, centrifugal, pressure type), vibrating fluidized bed dryer, static vacuum dryer, hot air circulation oven, rake type, pulp leaf vacuum dryer, boiling dryer (horizontal, vertical), etc.

These high efficiency mixing granulator provide guarantee for product quality, but there is the problem of "dust". Because of the increasing of nanoscale products, the smaller size of the original particle size, the increase of the potential water content of the paste material, and the continuous development of enterprises in the direction of large-scale and scale, the enterprise is eager to combine the high efficiency mixed granulator. In particular, some large tonnage products, such as precipitating calcium carbonate, are currently producing about 3000000 tons in the country, the minimum production line is 10 thousand tons, five sets of high efficiency mixed granulator for 100 thousand tons, and 500 thousand tons of a enterprise planning in Guangxi. According to the current high efficiency mixed granulator level, the area of the equipment and the drying of the products are dry. The amount of dust collected from the tail gas is very large.

According to the current pulse bag filter widely used in the industry, the operating environment is very bad, and effective measures must be taken to solve it. Therefore, we hope that the equipment development unit will focus on two problems, one is the drying problem with high water content, and the two is the "dust" industrial health problem after the dry tail gas is dry. Taking calcium carbonate industry as an example, more than 200 enterprises in China, in the type selection of high efficiency mixed granulator, basically adopt rotary indirect heating dryer, disc type continuous dryer, rotary column drier and so on. Although the production efficiency is satisfied, the energy consumption and tail gas "dust" are not ideal, one into the calcium carbonate enterprise, from the ground The roof is covered with a layer of white calcium carbonate powder, even in the desk and chair of the office is a layer of white, this is a management problem, more important is the dry tail gas after the "dust" does not pass. Recently, the industry has introduced the dust removal equipment produced by the US DuPont Co, which basically solved the problem.

Therefore, the combination of high efficiency mixed granulator should include: providing heat source equipment, one or two level high efficiency mixed granulator, tail gas collection "dust" equipment and so on. Hope that the equipment manufacturing and research units do articles in the aspects of high thermal efficiency, low energy consumption, simple configuration and convenient control, and do the article in the combination of high efficiency mixed granulator. Chapter, to serve others, to develop themselves. If the drying problem of calcium carbonate industry is solved, the equipment is efficient and environmentally friendly, and the drying problem of other varieties will be solved well.