The inorganic salt industry has high demands for drying equipment, including high thermal efficiency, low energy consumption, simple configuration, easy operation, compact footprint, and a safe and hygienic working environment. Currently, common drying technologies used in this sector include rotary tube dryers, rotary indirect heating dryers, disc continuous dryers, and air dryers—classified into pulse air flow, air flow rotation, and positive/negative pressure secondary air flow systems. Other popular options are the Rotary Flash Dryer, Rotary Drum Dryer, Spray Dryer (available as Granulator, Powder, Centrifugal, or Pressure types), Vibrating Fluidized Bed Dryer, Static Vacuum Dryer, Hot Air Circulating Dryer, Oven Type, Paddle-type vacuum dryer, and boiling dryers (horizontal or vertical). These drying systems play a crucial role in maintaining product quality. However, challenges remain, particularly in tail gas collection. With the growing number of nano-scale products, particle sizes have become finer, and the moisture content in paste-like materials has increased. Additionally, as companies expand toward large-scale production, there is a pressing need for integrated drying solutions. For example, in the case of precipitated calcium carbonate, which exceeds 3 million tons nationwide, even the smallest production line can produce 10,000 tons annually, requiring five sets of drying equipment for a 100,000-ton output. A company in Guangxi plans to produce 500,000 tons, but with current technology, the amount of dust collected from the exhaust remains significant, regardless of the equipment's size. Industry-standard pulse bag filters often create harsh operating conditions, making it imperative to address these issues. Therefore, we urge equipment developers to focus on two key challenges: first, effectively drying high-moisture paste-like materials, and second, managing dust emissions from the drying process. The calcium carbonate industry serves as a clear example. Over 200 companies across the country typically use basic rotary indirect heating dryers, disc-type continuous dryers, or rotary column dryers. While these meet production efficiency requirements, they fall short in terms of energy efficiency and dust control. One incident involved a calcium carbonate plant where fine powder coated the ground, ceiling, and even desks and chairs in offices, highlighting serious hygiene and management issues. More importantly, the tail gas was not properly managed, leading to excessive dust emissions. Recently, some companies adopted DuPont’s dust removal systems, which significantly improved the situation. To address these challenges, combined drying systems should integrate heat source equipment, primary and secondary drying units, and advanced tail gas collection and dust removal systems. I hope manufacturers and research institutions will prioritize developing high-efficiency, low-energy, user-friendly, and easily controllable drying solutions. By focusing on integrated systems, they can better serve industries while also driving their own innovation. If the calcium carbonate industry successfully tackles its drying and environmental challenges, it could set a precedent for solving similar issues across other sectors.

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