Development status and characteristics of drying equipment for calcium carbonate industry

The overall requirements are high thermal efficiency, low energy consumption, simple configuration, convenient control, small occupation area, safe and hygienic operation environment. At present, the commonly used drying equipment in the inorganic salt industry includes rotary pipe dryer, rotary indirect heating dryer, disc continuous dryer, air dryer (pulse air flow, air flow rotation, positive and negative pressure two stage airstream drying), rotary flash dryer, rotary drum dryer, spray dryer (also granulating, powdery, centrifugal, pressure type), vibration. Fluidized bed dryer, static vacuum dryer, hot air circulation oven, rake type, paddle type vacuum dryer, boiling dryer (horizontal, vertical), etc.

These drying equipment provide a guarantee for the quality of products, but there are problems of dust collection in tail gas. Due to the continuous increase of nano products, the original particle size is becoming more and more fine, the potential moisture content of paste materials is increased, and enterprises are eager to combine drying equipment. In particular, some large tonnage products, such as precipitated calcium carbonate, currently have a national production capacity of more than 3 million tons. The annual output of small production lines is 10000 tons, and the scale of 100000 tons requires five sets of drying equipment. An enterprise in Guangxi plans to achieve 500000 tons. According to the current level of drying equipment, both the floor area of the equipment and the amount of "dust" in the tail gas after drying are very large.

According to the pulse bag filter which is widely used in the industry, the operating environment is very bad, and we must take effective measures to solve it. Therefore, we hope that the equipment research and development units will focus on two problems: one is the drying of paste like micro objects with high water content, and the other is the industrial hygiene problem of "dust" from tail gas after drying. Taking the calcium carbonate industry as an example, more than 200 enterprises in China basically adopt rotary indirect heating dryer, disc continuous dryer and rotary tube dryer in the selection of drying equipment. Although the production efficiency is satisfied, the energy consumption and tail gas collection "dust" are not ideal. Once entering the calcium carbonate enterprises, a layer of white calcium carbonate powder is covered from the ground to the roof, and even In the office desk and chair is also a layer of white, on the one hand, there are management problems, more importantly, the exhaust gas after drying "dust" is not qualified. ^Recently, the dust removal equipment produced by DuPont company in the United States has been introduced into this industry, which basically solves the problem.

Therefore, the combined drying equipment should include: providing heat source equipment, primary and secondary drying equipment, tail gas collecting "dust" equipment, etc. we hope that the equipment manufacturing and research units will do something in the aspects of high thermal efficiency, low energy consumption, simple configuration, convenient control, etc., and in the aspect of combined drying equipment, we can serve others and develop ourselves. If the drying problem of calcium carbonate industry is solved and the equipment is efficient and environment-friendly, the drying problem of other varieties will be solved.

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