China Building Materials Hefei Academy Successfully Developed a Large Vertical Mill

The HRM4800 vertical raw material mill, developed by Hefei Cement Research and Design Institute under China National Building Materials Group, has been successfully implemented in the 5,000 tons per day production line of Zhejiang Hushan Group Co., Ltd. This achievement marks a significant milestone, as all technical parameters not only meet but exceed the design specifications, with the machine’s performance reaching international advanced standards. The successful application of this equipment highlights China's growing capability in developing high-performance cement production technology. In recent years, large-scale raw material grinding systems have become the industry standard for cement production, driven by global trends and national policies. In 2004, the Chinese government initiated industrial restructuring efforts in the cement sector, creating new opportunities for the development of large-scale NSP (New Suspension Preheater) cement production lines. As these large-scale lines become more common, the demand for efficient, large-capacity equipment has also risen significantly. Traditionally, ball mills have dominated the grinding process in cement production, but they are increasingly unable to meet the needs of modern, large-scale operations. Ball mills require massive physical space and consume excessive energy, making them less efficient for today’s high-output production lines. In response, manufacturers worldwide have turned to vertical mills, which utilize a bed-grinding mechanism to achieve higher efficiency, lower power consumption, and better drying capabilities. These mills can handle larger feed sizes, reduce operational costs, and offer a smaller footprint, making them ideal for modern cement plants. Since the start of the 10th Five-Year Plan, China has actively promoted investment in new dry-process cement production lines with a daily capacity of 5,000 tons. However, large raw material mills for such lines were previously imported, limiting domestic control over key technologies. To address this, several research and manufacturing companies began localizing the technology, drawing on foreign designs and improving upon them. In 2006, Hefei University launched a project focused on developing an energy-efficient, large-scale vertical mill with independent intellectual property rights, specifically designed for 5,000-ton-per-day cement clinker production lines. According to Lei Qianzhi, president of the China Cement Association, vertical mills represent a critical bottleneck in the industry’s development. Their localization brings substantial economic benefits, including reduced costs and improved competitiveness. Economic analyses conducted by Hefei Cement Institute experts suggest that if 20% of new 5,000-ton lines adopt this technology, it could lead to at least four to five sets of large vertical mills being sold annually, generating around 130 million yuan in revenue and 8–10 million yuan in profits and taxes. Additionally, the HRM4800 vertical mill offers significant energy savings compared to traditional ball mills. For example, one 5,000-ton-per-day production line using two unloading mills saves approximately 18.4 million kWh annually, translating into cost savings of about 9.2 million yuan. Moreover, localized production reduces spare parts costs by roughly 50% compared to imported equipment, further enhancing cost-efficiency. Experts like Kong Xiangzhong, Secretary-General of the China Cement Association, emphasize the importance of vertical mills in achieving energy conservation and emission reduction goals. By lowering electricity and coal consumption, these mills help reduce carbon dioxide emissions. They also cut noise levels by at least 20 dB and reduce wear on materials, contributing to longer equipment life and lower maintenance costs. Zhou Qinghao, director of the Ministry of Science and Technology at the China Building Materials Federation, highlighted that by 2010, 70% of cement production in China would rely on new dry-process technology, with 100–200 new lines expected to be built. This represents a massive market opportunity for vertical mills. While vertical grinding is just one part of the broader trend toward equipment localization, there remains a 20% gap between China’s cement industry and its international counterparts. With strong government support and increasing competition among major cement groups, the focus on technological upgrades and equipment innovation has never been more critical. As large-scale production lines continue to expand, the ability to develop and manufacture advanced equipment will determine the future success of China’s cement industry.

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