The prominent problem existed in the production and sales for Kabuki Mine of Wuhai Mining Co. is high rate of fine ore of raw ore, while the sale price of fine ore in market is the lowest so that costs are difficult to be covered. Therefore, it is of great significances for reducing costs and increasing benefits in mines to improve on-site blasting technology so as to improve blasting quality. In order to find new method to improve the blasting effect, numerical simulation of blasting in the zone of total explosion is realized based on different blasting schemes so that the technical problem of past single-hole numerical simulation is solved as well as the effects under different blasting conditions are with comprehensive and deep analysis. Finally, the scientific and reasonable technical scheme is proposed by optimizing blasting schemes combining with such three aspects as design, analysis and numerical simulation so that blasting costs are saved. The experimental study on hole-by-hole blasting with uncoupled charge in radial direction is designed and proposed through studying the influencing factors of blasting process on generation of fine ore and combining with existing technical plan of blasting for the mine. The numerical simulation of blasting scheme in blast zone is carried out based on the GDEM blasting simulation software and particle size is analyzed for simulation effects. The study showed that the rates of fine ore and block were decreased by 9.45% and 3.07% respectively, qualified lumpiness was increased by 12.52 % and blasting effects were significantly improved with the optimization scheme.

In order to change the current situations that iron grade of flotation tailings is higher and loss of ferrous metal is great in the complex process of iron separation of ore grinding, weak magnetic separation-high intensity magnetic separation-flotation, the recycling process of ore grinding-magnetic separation is adopted for flotation tailings. The contrast test for recovery of magnetic separation with single variable is carried out with different ore grinding modes (ball mill and attrition mill) and flotation tailings of different granularities. With the increase of proportion of fine minerals, the yield of magnetic concentrate is decreased from 76.73% to 48.78%, grade is increased from 38.1% to 61.15% and recovery rate is decreased from 86.20% to 78.29% after grinding flotation tailings by attrition mill. The yield of magnetic iron concentrate is decreased from 78.05% to 56.63%, grade is increased from 38.10% to 55.78% and recovery rate is decreased from 92.80% to 82.92% after grinding flotation tailings by ball mill under the same magnetic separation conditions.

Enterprise archives are important components of scientific research achievements of enterprises as well as with such important functions as ensuring the traceability and confidentiality of scientific achievements and knowledge accumulation. With the continuous development and progress of enterprises, the management mode of enterprise archives also needs to be constantly innovated and transformed to meet the needs of technological innovation and development in the new era. In this article, it is aimed to discuss the direction and path of innovation transformation for management mode of enterprise archives in scientific research institutes, which could provide beneficial references for innovation and improvement of management mode of enterprise archives.

With the scaling up of air separation equipment, the capacities of supporting motors for air compressor, supercharger and oxygen reciprocating compressor are also increased. The capacity of motor for air compressor is developed to over 20,000 kW and scaling up of motor has brought unprecedented challenges for control and starting of motor and power grid. The start-up process of high-capacity motor is particularly complicated. On the one hand, the influences on power grid should be considered, on the other hand, the impact on motor and starting equipment should also be considered. Various starting modes are adopted based on conditions and demands in the industry, the reduction voltage with auto transformer discussed in the paper is one of mature reduced voltage starting technologies. The impact of auto transformer on power grid is low as well as it is with simple operation and stable performances, so it is widely used in the air separation industry. If the control mode of reduced voltage starting for auto transformer is selected improperly, it will cause certain damages to motor. The start control of auto transformer is studied and analyzed through cases in the paper.

In this paper, the causes of surface defects for 310 zed beam rolled by YQ450NQR1 continuous casting billet produced with cross section of bloom (320×415 mm) by 7^# continuous casting machine in Steel-making Plant of Baotou Steel are analyzed and control scheme is proposed so that the yield of product is improved. The tongue-shaped defects in rolled products are determined to be caused by the surface crack at corner of continuous casting billet by analyzing the macrostructure and microstructure of continuous casting billet and rolled products with metallographic microscope and scanning electron microscope. The qualified rate of YQ450NQR1 continuous casting billet is improved from 90.5% to 98.5% and stable control of product quality for 310 zed beam is realized through reducing the water amount and optimizing uniformity of water crevice for crystallizer to improve the uniformity of continuous casting billet cooled in crystallizer as well as taking such measures as reducing the specific water amount of secondary cooling, increasing casting speed to increase the surface temperature of entering tension leveler and optimizing slow cooling regime.

The 590CL wheel steel is formed by spinning and stamping technologies to be made into automobile spoke. There is cracking in the process of stamping air hole. The cracking position is determined to be between the air hole on outer edge of spoke and shear end as well as fracture origin is at the air hole end of wheel steel, which is about the central part of plate thickness through macroscopic observation of cracked wheel steel as well as such comprehensive analysis as scanning electron microscope and metallographic examination; the zone of segregation in the core of wheel steel with inclusions those are mainly C and Nb in shape of dot string could all hinder normal deformation of ferrite in pre-forming process so that the fluidity of metal is inconsistent. As a result, the work hardening is generated and stress concentration in segregation in the core induces cracks, then stress is released through punching so that cracking is caused. It is suggested to adjust the composition to ensure appropriate proportions of niobium and carbon as well as optimize processes of steelmaking, continuous casting and rolling in the future production and processing processes.

With the rapid development of artificial intelligence, automatic driving technology and intelligence of mining, unmanned intelligent vehicles in mines have gradually become the important tool for improving operation efficiency in mines, reducing accident incidence and saving costs. In this paper, the key technologies, functions and challenges faced of unmanned intelligent vehicles in mines are systematically analyzed. First, the application background of driverless technology in mine environment is discussed as well as such key technologies as perception, decision making, control and communication it needs in mining operations are analyzed. Second, the core functions of unmanned intelligent vehicles in mines including auto drive and path planning, collaborative operations, safety and exception handling are proposed. Finally, the technical challenges faced by unmanned intelligent vehicles under the working conditions of complex geographical environment, severe weather and high load are analyzed as well as the solutions are proposed and development trend of unmanned intelligent vehicles in the future is prospected. This paper is aimed to provide the theoretical supports and technical references for research and applications of unmanned intelligent vehicles in mines.

The assembly for pretwisted blades of turbine has significant effect on its overall performance. In this paper, its deformation mechanism is studied and simulation experiments are carried out through finite element model to verify the accuracy of assembly system for pretwisted blades. The process parameters of manually tapping blades are obtained using high speed camera and piezoelectric type impact sensor as well as corresponding mathematical model is established. The parameters of this model are adjusted in software to design the assembly system for pretwisted blades of turbine. The final results indicated that sufficient impact could be generated by the assembly system to meet assembly requirements when the range of air source pressure was between 0.4 MPa and 0.6 MPa so that feasibility and effectiveness of the system were verified.

The heating in smelting and rolling laboratory is with natural gas radiation as well as the CO generated by natural gas leakage and incomplete combustion can lead to such accidents as fires and explosions very easily. In the article, a wireless and low-cost detection system of flammable gas is developed, which is with the STM32F103 series single chip computer as main control system. The concentrations of methane and CO in workshop are monitored with MQ-2 and MQ-7 gas sensors, temperature and humidity in workshop are monitored with SHT30 sensor of temperature and humidity as well as the data collected by sensors is transmitted to mobile terminal with Bluetooth module. The data processing and analysis are realized with mobile terminal and Android operating system, which could meet the requirements of monitoring flammable gas used in smelting and rolling laboratory.

With the development of global economy, the energy poor and environmental pollutions are becoming increasingly serious as well as low carbon and environmental protection, energy conservation and emission reduction have become the focus of global attention. In this context, Baotou Iron & Steel (Group) Co., Ltd. actively responds to the call of the country, promotes elimination and replacement of old-fashioned diesel locomotives, which are committed to achieving green and low-carbon railway transportation. In this article, the transformation ideas, technical solutions and practical application effects are discussed by taking the research and development and application of pure electric locomotives in factory region of Baotou Steel as object of study. The practical application shows that the effects of pure electric locomotives on saving energy as well as reducing consumptions, carbon emissions and noises are significant. The research of this article provides the solutions for green railway transportation of all industries as well as practical references for promoting green transformation of rail transit equipment in our country and high quality co-construction of the “Belt and Road”.