This paper discusses the potential of synergistic application of methane dry reforming (CH₄-DRM) and carbonate decomposition technology for CO₂ emission reduction in the cement industry and its industrial application prospects. The basic principle and thermodynamic characteristics of CH₄-DRM reaction are introduced, and its key role in CO₂ resource utilization is analyzed. The research progress of related catalyst design and reaction condition optimization is also summarized. For in-situ CO₂ reduction via carbonate decomposition, the thermal efficiency advantages and the industrial coupling approaches with CH₄-DRM are discussed, and the feasibility of industrial application is evaluated. Finally, the future research directions are proposed based on clarifying reaction mechanism, process integration, catalyst optimization and large-scale utilization evaluation, providing theoretical support and technical guidance for the low-carbon transformation of the cement industry.

The high temperature exhaust gas from the rotary kiln head of the cement production line, after undergoing heat recovery through a grate cooler and a waste heat boiler, is discharged at approximately 100°C. Direct emission of this gas results in significant heat waste. By implementing the Cooler Air Loop System, both heat utilization efficiency and waste heat recovery (WHR) power generation can be further enhanced. Based on the heat balance principles, the input-output thermal equilibrium of the grate cooler was analyzed, and theoretical calculations were performed to evaluate heat variations at the waste heat boiler inlet. The results demonstrated that reintroducing the externally emitted kiln head exhaust into the grate cooler’s cooling air system increases the heat input to the boiler without altering other thermal parameters, thereby improving the steam turbine efficiency and boosting power generation.Taking a 5 000t/d dry-process clinker production line as an example, the design and installation of the Cooler Air Loop System were detailed, emphasizing optimization measures such as rational duct layout and advanced control technologies. Practical application showed that after Cooler Air Loop System implementation, WHR power generation increased by 6.38kW·h/t.cl, while exhaust emissions and thermal pollution were effectively reduced, yielding notable environmental and economic benefits. 

The roller is the core component of the vertical roller mill, and usually adopts the combination of cylindrical bearing and double-row conical bearing, how to improve the bearing life and reduce the cost of roller is the focus of current research. The traditional calculation method for the bearing life of the roller is based on the assumption of uniform distribution of the pressure on the roller surface, resulting in a significant difference between the calculated life and the actual service life. This paper proposes a new calculation method that adjusts the loading position of the roller pressure to the large end of the roller sleeve, and the positions of the cylindrical bearing and the conical bearing are reversed, the life of cylindrical bearing and double-row tapered bearing is more than 80 000h by force analysis and calculation. At the same time, the bearing selection is optimized according to the new configuration scheme, and the stress calculation of roller shaft and finite element analysis of roller shaft and hub are carried out, which effectively reduces the redundant design of bearing. The practical application shows that the optimized roller bearing configuration has been successfully operated for more than three years, which has improved the reliability and service life of the equipment, saved the cost and achieved remarkable economic benefits.

Steel slag is a by-product of the steelmaking process and grinding it into ultra-fine micropowder can improve its chemical activity, facilitating resource utilization. This paper analyzes the existing problems in common steel slag grinding systems including vertical mill final grinding, roller press final grinding and ball mill grinding, and proposes a solution by developing TRMGP34.2 external circulation steel slag vertical mill combined grinding system. Taking a production line with an annual output of 300 000 tons of  ultra-fine steel slag powder as an example, the process flow, main equipment configuration, working principle and key features of TRMGP34.2 external circulation steel slag vertical mill are introduced. Key parameters such as grinding table speed and roller pressure were optimized, and the designs of grinding zone, scraping plate, slag discharge port, wear-resistant lining plates and internal iron removal device are inproved. After the project was put into operation, it further optimized the grinding pressure of the nill, improved the vibration of the mill, adjusted the amount of water spraying in the mill, the outlet wind temperature and the circulation of the external slag discharge,,so that the ultra-fine steel slag powder with product specific surface area reaches 550m2/kg, and the production is continuous and stable, which effectively promotes the resource utilization of steel slag.

The traditional batching silo in cement production is analyzed for its problems such as the simple structure of the discharge chute and the large critical angle of repose of materials. When industrial by-product desulphurization gypsum is used as a retarder, it is prone to silo blockage, interruption and silo bridging due to its high moisture content and high viscosity. The application of a special-shaped forced rotary discharge device has been used to transform the batching silo. The upper part of the original batching silo is reused and the lower part is demolished and a new "split-into-two" special-shaped silo body is installed. High molecular polyethylene boards, special-shaped forced rotary discharge device and proximity limiter mechanism are installed. The forced discharge device is equipped with three scrapers, and the relative motion of the scrapers and the silo wall has realized the stable flow materials in all directions. It can judge the blockage of the equipment by itself, and the automatic plugging of the batching silo is realized. After the modification, the cement SO³ control index is reasonable, the qualified rate of cement out of the mill is improved, and the electricity can be saved about RMB 1.693 2 million per year, and the labor cost can be saved about RMB 180 000.

In order to solve the problem of low production efficiency of manual bag insertion for cement packing workshop, which is difficult to adapt to the intelligent level of downstream production process packaging machine and improve production efficiency, a automatic bag insertion machine for cement sack is developed. Automatic bag insertion machine is composed of bag-arranging device, bag-inserting device and counting device,etc.The bag-arranging device adopts the mode of bag-arranging, bag-dividing and bag-delivering to  ensure that the cement packaging bags into a stack of neatly placed, distributed without sticking;the bag insertion device is composed of a bag rotating machine, a bag turning machine and a bag insertion machine, and the insertion of the bag operation is completed collaboratively. The counting device is composed of two sets of spring induction counters, and the counting work of the packed cement bags is completed. After the application of automatic bag inserting machine, the production efficiency can reach up to 120t/h, and the success rate of slotting is more than 97%. It can automatically identify whether there is a cement sack on the packaging machine in the downstream production process, whether it is necessary to insert a bag, automatically follow the production speed of the packaging machine to complete stepless speed following, and the packaging machine perfect cooperation.

The review analysis reveals that current blasting design software for open-pit mining predominantly focuses on optimizing isolated operational processes, lacking data integration with downstream production stages. Economic evaluations remain narrowly centered on explosive consumption metrics, omitting comprehensive multi-dimensional cost considerations. As an integral component of digital mine systems, intelligent blasting design software enables seamless integration with subsystems like mine production management platforms and geological resource databases. By extending design functionalities to downstream workflows, it empowers digital mine systems to achieve precise control over end-to-end production processes, maximizing the economic value of blasting operations. Taking a limestone mine as an example, the implementation of intelligent software streamlined workflows into: blasting zone definition, scheme comparison and optimization, automated hole layout, charge configuration, blast network design, and final output generation. Crucially, muck pile fragmentation recognition technology provides data-driven support for automated scheme optimization. This innovative software development pioneers full lifecycle cost optimization for blasting plans, establishing a new paradigm for enhancing mine profitability through systematic cost economics.

The welding process of a roller press sleeve consists of four layers from the inside to the outside: the root pass layer, transition layer, wear-resistant layer, and pattern layer. The welding quality directly affects the extrusion efficiency of the roller press. This study analyzes the drawbacks of traditional manual or semi-automatic welding methods, such as uncontrollable welding processes, difficulties in data traceability, and low production efficiency. To address these issues, a PLC-based robotic automatic welding control system is proposed. The system employs a PLC as the main control unit and utilizes IoT technology to enable cloud-based data transmission. Real-time monitoring and feedback of welding process data are achieved through a molten pool monitoring device, 3D scanning system, welding wire weighing device, and encoder. By developing PLC control program, roller sleeve welding robot control program, and HMI interface program, the system realizes full automation and precise control of the welding process. Production trials demonstrate that the robotic automatic welding control system significantly improves the surface uniformity and cleanliness of welded roller sleeve, effectively reduces crack formation, and enhances both welding quality and production efficiency. Furthermore, it ensures consistency in sleeve quality and traceability of the manufacturing process.

The digital and intelligent transformation of cement enterprises is an inevitable trend conforming to the development of the times, the construction of high-quality data system is conducive to the production and development of enterprises. The main contents of digital and intelligent transformation of cement enterprise are expounded, including the implementation of metadata and master data cleaning management, the realization of the cross-system data connectivity and the standardization of business process, the construction of multi-module high-quality data system, and the strengthening of data security through encryption, desensitization, access control, and security monitoring. Through the implementation of digital and intelligent transformation, cement enterprise has realized the standardized management system, informatized business process, digitalized quality control and intelligent work mode. These efforts have significantly improved the data quality and data value, and promoted seamless integration of management data and efficient collaboration across all levels of business.

A 4 500t/d cement clinker production line uses nonferrous metal ash as iron raw material. The content of water-soluble chromium (VI) in cement clinker produced in 2024 is as high as 14.30mg/kg, which seriously exceeds the national limit. The reasons for the excessive content of water-soluble chromium (VI) in the production line were analyzed. The content of water-soluble chromium (VI) in cement clinker was reduced to 10.01mg/kg by appropriately reducing the calcination temperature of cement clinker and adjusting the matching of air, coal and material in the rotary kiln system; Further control the content of total chromium in raw materials, use copper slag with low content of total chromium as iron raw material, and add ferrous sulfate reductant with low price and low toxicity in the cement grinding process, so that the content of water-soluble chromium (VI) in outgoing cement is reduced to <6.12mg/kg, which is better than the limit index requirements specified in GB31893-2015 "Limit and determination of water-soluble chromium (VI) content for cement", and has high application value.

The wet desulfurization system of a 5 000t/d cement clinker production line operates poorly when the inlet sulfur dioxide concentration is high,in order to meet the local environmental emission standards for SO₂ emissions at the outlet of the chimney outlet , the desulfurization system has been optimized and upgraded.This article analyzes the current situation and existing problems in parameter settings, system processes, production operations, etc. of slurry preparation systems, absorption tower systems, gypsum dewatering systems, etc.Proposed solutions include adding vibration devices to improve material blockage in the feeder, controlling the pH and density values of the slurry in the absorption tower slurry pool area, controlling excessive dust and low sealing pressure of the circulating pump, and adjusting the moisture content of gypsum.After the desulfurization system renovation, the SO₂ emission concentration at the chimney outlet remained stable at <35mg/Nm³. At the same time, this article proposes precautions for shutdown of wet desulfurization systems and control strategies for system feed liquid balance and chemical reaction balance.

Compared to traditional coal, biomass bamboo charcoal is more "green and clean," and can partially replace conventional fossil fuels required for cement production. This study analyzes the industrial and structural characteristics of biomass bamboo charcoal and conducts industrial substitution trials in a 5 000t/d clinker production line. During the trial, biomass bamboo charcoal was blended with coal at a 60% weight ratio, separately metered, fed into the coal mill, ground into a mixed powder, and then transported to the coal powder silo. After further metering, it was sent to the rotary kiln and precalciner for combustion. The results show that adding biomass bamboo charcoal has no significant adverse effects on the operation of the cement rotary kiln. However, due to its high alkali content, attention should be paid to the clinker's alkali levels, and the blending ratio should be reasonably controlled. Emissions of NOX and SO₂ at the kiln tail increased slightly, but this can be mitigated by optimizing the air-coal-material ratio or using the charcoal in the precalciner at lower temperatures. The clinker's 3d strength increased by 0.7MPa, and its 28d strength improved by 1.8MPa, indicating enhanced clinker quality. The standard coal cons umption per ton of clinker decreased by 61.57kg/t. Based on an annual production of 1.5 million tons of clinker, this substitution could reduce CO₂ emissions by approximately 255 000 tons per year, demonstrating significant energy-saving, emission-reducing, and carbon-cutting effects.

Coal gangue contains a certain proportion of kaolinite and can be used as a cement admixture, but its volcanic ash activity is extremely low, leading to poor utilization.  To improve the utilization rate of coal gangue, elemental analysis, phase analysis, and TG-DSC thermal analysis were conducted to compare the alkali content, kaolinite content, and heat release enthalpy of coal gangue and kaolin from different origins. The study also investigated the effects of calcination temperature, grinding fineness, and kaolinite content on the volcanic ash activity of coal gangue.  The results show that at a calcination temperature of about 1 000℃, the heat release enthalpy of coal gangue is positively linearly related to the kaolinite content; different calcination temperatures and origins of coal gangue have varying contributions to the 3d and 14d volcanic ash effect strength; grinding fineness significantly affects the 3d and 14d volcanic ash activity of coal gangue; the higher the iron content in coal gangue, the redder the calcined coal gangue becomes, which negatively impacts its application in cement.  In industrial production, thermal analysis should be used to qualitatively predict the volcanic ash activity of coal gangue, experimental determination of the optimal calcination temperature and grinding fineness is necessary, and tests should be conducted to determine whether there are under-fired or over-fired conditions in coal gangue, with a preference for using coal gangue with lower iron content as raw material.

Based on the latest Chinese national electrical codes, the paper systematically elaborates on the design essentials of fire emergency lighting and evacuate indicating system in cement engineering projects.The design deviations because of the inconsistent standard terminology definitions and varying clause requirements, the paper integrated the requirements of nearly 10 standards which including GB55037-2022 and GB17945-2024. The paper summarized the latest requirements for the setting of emergency lighting, illumination requirements, system classification, luminaire selection, and power supply method selection. Additionally, we have clarified the design flow sheet in this paper. Firstly, select a central or non-central fire emergency lighting system based on the project requirements and determine the illumination requirements of the site. Secondly, comprehensively select the type of lighting fixtures, color temperature, protection level, and other six dimensions, and adjust the battery configuration based on the new standards. Finally, the design is completed by standardizing the selection and wiring design of the power distribution box. It provides systematic guidance for electrical engineers to carry out fire emergency lighting and evacuate indicating system design for cement engineering projects within the framework of the new standard.