The design and development of the TRMS66.4 slag roller mill and the technological characteristics of the slag grinding system are introduced. TRMS66.4 mill adopts high-efficiency cage-shaped structure separator, which has high sorting efficiency; adopts modular design to realize multiple combinations and improve design efficiency; and uses ductile iron, which can improve quality of product; adopts finite element analysis to ensure the reliability of key components of the equipment; at the same time, it is equipped with a remote online monitoring and diagnosis system. The operation of TRMS66.4 slag roller mill in Fangcheng Gang, Guangxi for grinding slag and composite powder shows that，when the specific surface area of slag powder is 420m²/kg, the output is 290t/h, and the power consumption is 33.5kW·h/t; when the specific surface area of composite power is 450m²/kg, the output is 280t/h, and the power consumption is 36.5kW·h/t.

Several typical cases of high temperature fault for supporting rollers of rotary kiln have been analyzed. As the main part of the rotary kiln supporting device, the supporting rollers'shafts and bearing of rotary kiln is prone to high temperature and even result in the kiln stop accident caused by the damage of the shafts and bearing , due to the influence of various factors such as the adjustment of kiln process operation or the deviation of installation, the lack of daily operation and maintenance management and so on. The occurrence of high temperature fault of supporting rollers'shafts and bearing can be effectively prevented by taking measures such as regularly testing the operation parameters of rotary kiln for comprehensively grasping the operation state of thermal equipment, and then timely eliminating hidden dangers of equipment.

Babbitt metal on the hydrostatic bearing surface of the roller mill reducer has through scratches and iron impurities embedded, and at the same time, concentric grooves are pulled on the thrust surface of the output flange, which reduces the operational reliability of the roller mill reducer and easily leads to equipment accidents. After disassembling the reducer, cleaning the one-way valve in the high-pressure oil distributor, and checking the lubricating oil delivery pipeline, the causes of iron impurities in lubricating oil were found. By replacing plunger-type high-pressure oil pump with gear-type high-pressure oil pump and strengthening daily inspection of lubricating oil quality, the hidden trouble of equipment operation is eliminated, and the operational reliability of roller mill reducer is improved.

It analyzed reasons of the oil leakage of raw mill sealing and cylinder piston head cracking. Under one mill roller, two cylinder piston rod bear different pressure, which caused cylinder fatigued cracking. While replacing hydraulic cylinder，one new simple installing tool was made to adjust the edge between piston rod and clevis end, which insures the same pressure bear by two piston rod of hydraulic cylinder. After replacing hydraulic cylinder, by controlling limestone grain size, the mill output and suitable raw material thicknesses, and strengthening maintenance of mill hydraulic system，hydraulic cylinder cracking problem has been solved completely.

This paper introduces the construction target content and overall system architecture of the intelligent management and control platform as the core of the digital mine. The core concepts and design principles of the system design are discussed. The functional design of the intelligent management and control platform is listed, which mainly include functions such as intelligent ore allocation, basic information management of mines, basic information management of exploration rights, production plan management, and equipment management. The actual application of the management and control platform system in the Pinshan Limestone Mine shows that the multi-source data of the mine has been systematically integrated. The synergy of all production links has been strengthened. The production efficiency and command and dispatch efficiency of open-pit mining have been significantly improved. At the same time, it enhances the coordination and safety of mining operations, laying a technical foundation for the digital and intelligent mining of mines.

The article introduces the network topology of DCS system of cement plant based on the redundancy design scheme of dual ring network under Hirschmann HIPER-Ring protocol. In this scheme, the Freelance AC900F controller in the automatic integrated control system of the cement plant forms a redundant dual ring network topology with the optical fiber interconnected Hirschmann switch, which can automatically switch to the standby communication line in case of failure of the communication line, play the high reliability of the redundancy ring network, at the same time, avoid the broadcast storm, and effectively improve the reliability and stability of the automatic control system of the cement plant.

The composition and working principle of the high-efficiency vacuum pumping system are introduced. On the basis of the original water jet vacuum pumping system, SXCQ-33-Y-11 high-efficiency vacuum pumping system is added, and the steam turbine vacuum pumping system of 9 MW waste heat power station is reformed. After the transformation, the power of the new system is only 11 kW, and the working fluid is changed from easily gasified water to 32/46# oil. The water and electricity consumption is greatly reduced. At the same time, the system structure is simple, and the land occupation and maintenance are small.

In this paper, the CF-252 neutron source of the neutron activation online analyzer and its safety protection strategy are introduced. The radiation dose around the neutron activation online analyzer is measured and calculated. The safety of the daily operation of the online analyzer is analyzed in combination with relevant national standards of radioactivity safety, so as to avoid unnecessary radiation more scientifically and reasonably, and better play the role of neutron activation online analyzer in cement production quality control.

When non-ferrous metal materials enter into the grinding system in the cement plant, it is easy to cause production shutdown, roll surface damage and high maintenance costs. The sensitivity of metal detector can be adjusted to the appropriate value, the use of interphone can be reduced, the bulk of non-ferrous metal materials can be removed, the failure rate of grinding equipment can be reduced, the maintenance cost can be saved, and there is no frequent false alarms.

The products properties and technical data of conventional refractory bricks and refractory bricks with low thermal conductivity were analyzed and compared. The application of nano thermal insulation materials in precalcing system was introduced. The practice shows that the low thermal conductivity refractory bricks has low thermal conductivity, high strength and light weight, which significantly reduces the heat loss of the firing system, reduces the operation load of the rotary kiln and saves the energy consumption. The thermal insulation performance of nano thermal insulation material is obviously better than that of ordinary calcium silicate plate.