The inorganic salt industry has specific requirements 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 widely used systems are the Rotary Flash Dryer, Rotary Drum Dryer, Spray Dryer (available in granulator, powder, centrifugal, and 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 increasing production of nano-scale materials, particle sizes have become finer, and the moisture content in paste-like materials has risen. Additionally, as companies scale up operations, there is a growing need for integrated drying solutions. For instance, in the case of precipitated calcium carbonate, which exceeds 3 million tons nationally, even the smallest production line can produce 10,000 tons annually. To achieve 100,000 tons, five sets of drying equipment are typically required. A company in Guangxi aims to produce 500,000 tons, but current drying technology struggles with managing the dust generated from tail gas, regardless of the equipment’s size. Industrial practices often rely on pulse bag filters, which create harsh operating conditions and require constant attention. This issue needs urgent resolution. Therefore, we urge equipment developers to focus on two key challenges: first, the drying of fine, high-moisture paste-like materials; second, the management of dust emissions during the drying process. In the calcium carbonate industry, over 200 companies still use basic models like rotary indirect dryers and disc continuous dryers. While these meet production efficiency, they fall short in terms of energy efficiency and dust control. One company experienced severe issues, with calcium carbonate powder covering the floor, ceiling, and even desks and chairs in the office, highlighting serious hygiene and management problems. Moreover, the exhaust gases from drying processes often contain significant amounts of dust, which is not ideal. Recently, some companies adopted DuPont dust removal systems, which significantly improved the situation. Based on this, combined drying systems should integrate heat sources, primary and secondary drying units, and efficient dust collection systems for tail gas. We encourage manufacturers and research institutions to prioritize high thermal efficiency, low energy use, simplified design, and ease of control. By focusing on integrated drying solutions, they can better serve industries while driving their own development. If the calcium carbonate sector successfully addresses drying efficiency and environmental concerns, it could set a precedent for solving similar challenges across other drying applications.

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