As an important basic industry of the national economy, the green development of cement industry is of great significance to realize the goal of “dual carbon”. This report systematically reviews the technological development history of China's cement industry, and focuses on analyzing Sinoma's current innovative achievements and application practices of advanced pyro, grinding and environmental protection technologies and equipment. Research and practice show that through low resistance and high efficiency preheater, gradient combustion self-denitrification precalciner, new heat insulation materials and other pyro technologies, the heat consumption of the pyro system can be significantly reduced; the application of grinding technologies such as roller press finished grinding and vertical mill significantly reduces the system's power consumption; the vertical mill technology has been widely used in metallurgy and sand making industry by virtue of its characteristics of low energy consumption and high stability; the environmental protection technologies such as dust removal, SCR denitrification and wet desulfurization have realized ultra-low emission of dust, NOX and SO2 in cement factories; low energy consumption suspension calcination activation technology developed based on precalciner technology has been widely used in water purification agent, clay calcination and gangue calcination. In the future, Sinoma will continue to push forward technological innovation and green intelligent equipment upgrading to promote the green development of cement industry.

Direct Air Capture (DAC) technology can achieve permanent sequestration or resource utilization of CO₂ by capturing low-concentration CO₂ from the atmosphere, providing a "net-negative emissions" pathway for the cement industry. Its core innovation lies in the development of adsorbents. This article systematically summarizes recent research progress in adsorbents and compares the characteristics of liquid absorbents versus solid adsorbents by compiling experimental data, analyzing different technical routes, and examining actual application cases. Regarding cement industry integration, it proposes concepts such as using cement kiln waste heat to drive DAC regeneration, mineralizing captured CO₂ with solid waste to produce cementitious materials as partial clinker substitutes, and establishing carbon-closed loops (e.g., a "green hydrogen-DAC-mineralization" system). These insights provide a theoretical foundation for advancing the deep integration of DAC technology with the cement industry.

The "phase transfer-precipitation method" was adopted to conduct a pilot-scale experimental research on preparing nano-CaCO₃ using industrial solid waste phosphogypsum and CO₂ as raw materials. Through XRF, XRD tests, and SEM analysis characterization of the raw material phosphogypsum, its composition and content were determined, serving as the baseline for subsequent experiments. The pilot experiments investigated the adaptability and compatibility of key process conditions - including phase-transfer reaction, aging-separation reaction, carbonation precipitation reaction, and modification reaction - at a pilot scale. The results demonstrated that the Ca2+ conversion rates reached 90% for both phase-transfer and aging-separation reactions, and 95% for the carbonation precipitation reaction, indicating strong scalability of the optimized laboratory-scale conditions to pilot operations. The active nano-CaCO₃ produced at the pilot scale exhibited a pure calcite phase, with an average particle size of ~36nm, good dispersibility, and relatively uniform particle size distribution. The product’s key performance metrics either met or exceeded the specifications for plastic-grade nano-CaCO₃ (Type I) stipulated in the Chinese national standard.

With the acceleration of urbanization, the production of municipal sludge has surged. Traditional thermal drying disposal technologies face limitations in widespread application due to their high energy consumption and cost. Biodrying technology, which utilizes microbial metabolic heat to evaporate moisture, offers advantages such as low energy consumption, low cost, and environmental friendliness, aligning with the goals of carbon peaking and carbon neutrality. This paper reviews the research progress in biodrying technology, analyzes the impact of key factors—including temperature, microorganisms, moisture content, conditioning agents, aeration, and turning—on drying efficiency, and explores the application prospects of co-processing biodried sludge in cement kilns. Research indicates that maintaining high temperatures >60℃), optimizing the ratio of microbial inoculants, controlling initial moisture content (55%~65%), and implementing reasonable aeration strategies can significantly enhance drying efficiency. Domestic and international engineering cases confirm that biodrying technology can effectively achieve sludge reduction and resource utilization. Its integration with cement kiln co-processing can further reduce carbon emissions and yield significant economic benefits. Future research should focus on improving the efficiency of microbial organic matter utilization and optimizing models to promote wider application of the technology.

The drone inspection technology combined with visual AI algorithms provides an efficient solution for safety management in cement engineering construction. Through a drone system equipped with industrial-grade HD cameras, infrared sensors and other devices, it realizes all-round intelligent monitoring of personnel safety behaviors (such as wearing protective equipment), equipment status (such as loose bolts of tower cranes) and environmental risks (such as dust). The system adopts a collaborative architecture of "drone + fixed camera + intelligent terminal", and combines edge computing and multi-source data fusion technology to achieve real-time hazard identification and hierarchical response. Compared with traditional inspections, the hazard recognition rate of the drone team has increased by 60%~80%, and the average single inspection time has been reduced by 58.4%. Through the fusion of thermal imaging and LiDAR point cloud data, the real-time recognition of construction personnel not wearing safety equipment has been successfully achieved. Facing technical bottlenecks such as recognition accuracy in complex environments and battery life limitations, the drone inspection technology continues to upgrade through lightweight AI models (such as YOLOv5) and multi-modal perception optimization, effectively promoting the digital and intelligent development of safety management in cement engineering.

To address the issues of manual operation dependence, delayed oversized material identification, insufficient production optimization, and crude dust collection control in the limestone crushing system of a cement production line in Huaikan, Huzhou, an intelligent system solution based on "AI Video Analytics + APC Intelligent Control" was developed. The technical solution primarily includes: AI Video Analytics (Cameras deployed at the unloading pit utilize the YOLO object detection algorithm to identify large/oversized material blocks and mud chunks in real-time, triggering voice alarms and interlocking control with the control system)、APC Intelligent Control (Centered on multivariable model predictive control (MPC), it establishes production optimization and dust control loops; dynamically adjusts the speed of the plate feeder and optimizes current setpoints;Automatically sets negative pressure values based on dust escape detection and regulates the dust collector fan’s damper opening)、DCS Function Upgrades (Added one-click start/stop functionality with standardized start/stop durations;Implemented differentiated responses to active/passive material interruptions;Enabled seamless APC-group control handover).After deployment, the system reduced average power consumption to 0.975kW·h/t, increased integrated unit output to 877.24t/h, significantly lowered operator workload, reduced blockage risks, and simultaneously improved capacity utilization and environmental performance.

To improve the efficiency of bagged cement packaging and reduce dust pollution, an automatic cement packaging and palletizing system has been introduced. This system utilizes equipment such as fully automatic bagging machines, rotary packaging machines, palletizers, and check weighers to complete the automatic bagging, trimming, and palletizing of cement. It achieves a fully automated unmanned operation process from packaging to palletizing, and also covers the bagged cement with a film after palletization. The automatic cement packaging and palletizing system changes the traditional manual labor method for cement packaging, reducing the number of workers and lowering labor intensity, and controls environmental pollution at the source. After implementing the automatic cement packaging and palletizing system, annual labor costs can be saved by about CNY 1 million yuan, with a payback period of approximately 3.5 years. The fully antomated packaging and palletizing of bagged cement can save about 9 yuan per ton in labor costs for loading and unloading.

The ZGM123G-II medium-speed vertical coal mill system matched with a certain 6 200t/d clinker production line had long experienced problems such as coarse pulverized coal fineness and high power consumption. Through the upgrading of the grinding area by expanding the diameter of the grinding track of the table and the size of the grinding roller, and upgrading the grinding curve. Apply the new type of high-efficiency and low-resistance separator, optimize the rotor seal design. By optimizing and upgrading the air ring, the gas flow field and heat exchange inside the mill can be improved. Change the control mode of the hydraulic system to enable the central control operation to adjust the grinding pressure at any time, the fineness of pulverization coal R80μm decreased from 11% to <6%. The power consumption of the main motor of the vertical mill decreased from 15.5kW·h/t to 11.0kW·h/t, and the system power consumption  decreased from 28.7kW·h/t to 24.3kW·h/t. The payback period of the project investment is less than two years. It saves CNY 974 000 yuan in electricity fees annually, achieving remarkable energy-saving and consumption-reducing effects. 

Finned tube is a type of heat exchanger element used for enhanced heat transfer, which is composed of a base tube and external fins. The finned tube can effectively improve the convection heat transfer efficiency, reduce the weight of the equipment and reduce the project cost. Finned tube enhanced heat transfer technology has been widely used in the field of cement plant waste heat power utilization. In this paper, the principle of finned tube to enhanced heat transfer, classification of finned tube and its application in cement plant waste heat recovery (WHR) system are elaborated, which provides technical support for the improvement and upgrading of WHR equipment and system.

The co-processing of hazardous waste (HW) in cement kilns is a crucial technology for achieving reduction and harmless treatment of HW. The technological process involves high-risk links such as flammable and explosive materials, requiring a complete fire protection system to ensure safe operation. This paper discusses the key points of fire protection design for various process areas in HW disposal, including the liquid waste pretreatment area, industrial hazardous waste storage warehouse, pretreatment workshop, and inorganic solid waste workshop. According to the fire classification and hazard of different areas, applicable schemes for fire protection systems such aswater spray systems, foam fire extinguishing systems, automatic sprinkler systems, and fixed fire monitors are proposed. The design principles of fire pump stations, fire drainage, and accident water tanks are emphasized. The feasibility and compliance of the fire protection system are verified through an engineering case of a cement kiln co-processing project in Xinjiang, providing technical references for similar projects.

This study provides a comprehensive of the primary categories of cementitious materials utilized for carbon sequestration,their respective carbon sequestration properties, the impact of the carbon sequestration process on its effectiveness, carbon sequestration efficiency assessment methods and the current status of carbon dioxide sequestration rates are summarized, and the future development direction of carbon sequestration cementitious materials is also prospected. Calcium carbonate nanocomposite-based cementitious materials have been shown to enhance the mechanical properties of cement and carbon sequestration efficiency through the pore-filling effect, while magnesium oxide-based cementitious materials can achieve rapid carbon sequestration through the formation of high-strength carbonates, but their industrialization is still limited by high production costs. In terms of carbon sequestration processes, dry carbon sequestration process has become the focus of research due to its easy operation and low energy consumption, and supercritical CO₂ technology shows unique potential. The evolution of carbonization depth detection technology has progressed from the conventional phenolphthalein detection method to non-destructive testing methods such as confocal Raman microscopy and high-frequency ultrasonic imaging, which have significantly improved the testing accuracy. In terms of carbon sequestration efficiency, through material modification and process optimization, the CO₂ sequestration rate of some new materials has exceeded 200%. Future research can focus on developing the whole process of carbon reduction process, reducing the cost of material production, and perfecting industrialization.

In response to the ecological environment problems caused by the storage of lead-zinc ore tailings, low alkali cement clinker was successfully prepared.The preparation method involved the use of lead-zinc ore tailings powder and coal-fired slag as silicon aluminum raw materials, combined with limestone and copper smelting slag. The preparation process involved four distribution ratios:limestone 75.20%, tailings powder 10.45%, coal-fired slag 12.55%, and copper smelting slag 1.80%. Practice has shown that this production process significantly optimizes the performance of clinker, reduce the liquid phase formation temperature by 8℃, decrease physical coal consumption by 4.0kg/t, achieves a 28 day compressive strength of 61.3MPa, and comply with the standard for stable SO2 emissions. From 2023 to 2024, a total of 23.8×104t of industrial waste will be consumed, reducing the tailings storage capacity by 6.2×10⁴m³ cubic meters and saving 910 000 yuan in coal costs annually, resulting in significant economic benefits. At the same time, this technical solution enhances the combustibility through the mineralization of trace metal elements, effectively solving the problem of waste residue pollution.It achieves a synergistic effect of "waste discharge+waste utilization", and provides industrial demonstration for the green transformation of the cement industry.