Development status and characteristics of high-efficiency mixing granulator for calcium carbonate industry

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, safe and hygienic operating environment. At present, the commonly used high-efficiency mixing granulators in the inorganic salt industry are: rotary tube dryer, rotary indirect heating dryer, disc continuous dryer, airflow dryer (also divided into pulse airflow, airflow rotation, positive and negative pressure two) Airflow drying), rotary flash dryer, rotary drum dryer, spray dryer (also divided into granulation, powder, centrifugal, pressure), vibrating 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 a guarantee for product quality, but there are problems of tail dust collection. Due to the continuous increase of nano-scale products, the original particle size is getting finer and finer, the potential moisture content of the paste material is increasing, and the company is constantly developing toward large-scale and large-scale, the company is eager to combine high-efficiency mixing granulators. In particular, some large-tonnage products, such as precipitated calcium carbonate, currently have a national production capacity of more than 3 million tons, a small production line with an annual output of 10,000 tons, and a 100,000-ton scale requiring five sets of high-efficiency mixing granulators. A Guangxi company plans to obtain 50 10,000 tons, according to the current level of high-efficiency mixing granulator, regardless of the area of the equipment or the amount of "dust" collected by the exhaust gas after the product is dried.

According to the pulse cloth bag dust collector commonly used in the industry at present, the operating environment is very harsh, and it must be solved with strong measures. 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 second is the industrial hygiene problem of tail gas collection after dust is dried. Still taking the calcium carbonate industry as an example, more than 200 enterprises across the country basically use rotary indirect heating dryers, disc continuous dryers, rotary tube dryers, etc. in the selection of high-efficiency mixing granulators, although the production efficiency is met , Energy consumption and exhaust dust collection are not ideal. Once entering a calcium carbonate enterprise, the floor to the roof are covered with a layer of white calcium carbonate powder, even on the office tables and chairs. This aspect There are management problems, and more importantly, it is not enough to collect "dust" from the exhaust gas after drying. Recently, the industry introduced the 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, tail gas collection "dust" equipment, etc. It is hoped that equipment manufacturing and research units will have high thermal efficiency, low energy consumption, simple configuration, Make a fuss about controlling convenience, etc., make a fuss about combining high-efficiency mixing granulator, serve others and develop yourself. If the drying problem of the calcium carbonate industry is solved, and the equipment is efficient and environmentally friendly, the drying problem of other varieties can be solved.