Retrospecting the history of discovery, exploration and exploitation for the main and east ore body in Bayan Obo, this paper summarizes the research and industry practice on beneficiation and hydrometallurgy of Bayan Obo rare earth mine. It also overviews the research and development course of rare earth functional materials, points out that the research and comprehensive utilization of Bayan Obo rare earth resource interrelates with the generation and development of rare earth industry in China, and proposes some problems that need to be further understood in the current and future development of rare earth industry.

According to the construction lagging of the rock phase Ⅱ and ore reduction belt convey system in East stope, and the slip mass in C zone that affects the normal advancing of the stope, the delineation of stope boundary is redetermined, the highway exploit layout under 1404 m is ascertained, the production scale of the stope is verified, and the safety measures of the slope is confirmed, so as to ensure the normal production of the stope.

In this paper, the influence factors of desalting water system assorted with coke dry quenching are studied, part of the desalting water process is optimized, and the pretreatment and dosing system are modified. In summer, adding the non-oxidizing fungicides to the original water tank has osmotic stripping effect on the sediment and slime of the raw water, and it strictly controlled the pollution factors of the system.

In November 2016, the furnace condition of No.7 blast furnace in Baotou Steel is poor: high pressure difference, great fluctuation of furnace temperature and low gas utilization rate. Through analysis, the adjustment method is: stabilize the fuel ratio, thereby stabilizing the furnace temperature; on the premise of ensuring the central airflow, reduce the thickness of the edge material layer; enlarge ore difference and improve gas utilization; reduce the amount of stocking sinter, improve the permeability of the column and reduce the pressure difference.

In this paper, it aims at the problems encountered after the commissioning of pulverized coal injection system for two large blast furnaces in Baotou Steel, such as serious silo deformation of roof scrubber, large consumption of nitrogen injection, frequently worn-out of branch injection pipe and spray gun soft connection. By means of gradually improving the production process, equipment defects and poor ventilation, strengthening the silo, adjusting the pipeline air nozzle, increasing operation methods, improving operation technique and reducing injection air volume to reduce the energy consumption and to solve the problems in production.

The smelting of high Cr alloy steel has always been the difficulty of converter smelting. During the smelting of high Cr alloy steel in Steel-melting Plant of Baotou Steel, converter bottom blowing system is optimized through adjusting the converter loading system as well as the remaining slag double slag process and so on. The results show that the optimization of bottom blowing system ensures the melting for a large number of alloys during the tapping process and reduces the carbon and oxygen concentration product, and provides a basis for smooth smelting, solving the problem of high alloy smelting.

In this paper, it briefly introduces the production process and trial production results of high strength weather-resistant H-beam for railway carriage. The results show that the technical indicators such as chemical components and mechanical properties of the steel reach the standard requirements and meet the requirement of steel for carriage.

In this paper, it aims at optimizing the different tension control methods for rough rolling, pre-finishing and finish rolling unit of high-speed wire rod mill, ensures that there is no pile-up accident due to the change of outside rolling conditions, reduces the defects of head and tail rolling edge as much as possible, in addition to improve the size accuracy grade of products.

Bayan Obo West Mine is a large open pit mine, in which there are a lot of iron bearing rocks in the open pit mining boundary, and how to make use of iron bearing rocks to turn waste into treasure has become the key factor for enterprises to increase their resource utilization. In this paper, the systemic experimental study of beneficiation on iron bearing rocks in Bayan Obo West Mine is carried out, the scientific beneficiation method is used to complete the theoretical research for the comprehensive utilization of iron bearing rocks in the laboratory, which provides important basis for the design and industrial application of the beneficiation plants.

In this paper, the experimental study on FMG western ore fines substituting for Maota ore fines is carried out by using the sintering cup, and the sinter quality indicators and high temperature metallurgical properties of different substitution ratio are systematically studied. The results show that the FMG western ore fines can be used to substitute Maota ore fines in sintering production. On the premise of ensuring the stability of sinter quality indicators and high temperature metallurgical properties, it is suggested that the substitute proportion of FMG ore fines for Maota ore fines should be controlled within 12%.

In this paper, through the high power microscopic analysis for the scars on the outer surface of 15MnNbV pipeline, it is found that the defects of steel pipe are mainly caused by surface cracks on the round billet. According to the cause analysis of cracks on the round billet, it comes to a conclusion that the surface cracks on 15MnNbV round billet are mainly due to the low straightening temperature. Through the optimization of continuous casting process, it can be seen from the trial production effect that the improvement scheme has solved the surface crack problem of round billet.

The Q345E high strength low alloy structural steel is developed by advanced steel making, continuous casting, double stand rolling and cooling processes in heavy plate production line of Baotou Steel. Two component design schemes are adopted to produce Q345E. The result shows that the steel plate is uniform in structure and good in performance, which meets the requirements of the national standard. Through the comparison of the key processes, performance results and process costs of the two component design schemes, the theoretical basis for the formulation of Q345E process is provided.

In the thrusting block process of 20Mn2 seamless steel tube, there are fine cracks in the corner. The tube is inspected through chemical composition test and macroscopic examination of hot acid etching, the micro structure is analyzed by means of metallographic microscope and scanning electron microscope. The analysis shows that the nonmetallic inclusions are the main cause of cracks, and the qualitative analysis of the inclusions is made to find out the source and to put forward the corresponding improvement measures.

The effects of different normalizing temperature and holding time on the microstructure of Q345E with 65 mm thickness have been studied by optical microscope. The results show that: Compared with the controlled rolling and controlled cooling (TMCP) steel plates, steels normalized at 900 degrees, grains are fine and the whole cross-sections are the most homogeneous. With the prolonging of holding time, ferrite grain growth is not obvious but pearlite content decreases, having spheroidization trend.

Experiments are carried out on DP540 and DP590 using different types of welding experiments, and the mechanical properties and microscopic metallographic structure are compared to find out the reasonable welding technology. At the same time, the deposition efficiency and welding bead formability, change of spatter amount under different process parameters are studied. The mechanical properties and diffusible hydrogen content of the tested welding materials were tested. The mechanical properties, fatigue strength and residual stress of the weld joint after ultrasonic impact (UIT) treatment are studied.

In the paper, the heat treatment process scheme of 25CrMoRE steel is worked out. Under the corresponding of heat treatment process, the technical parameters of 25CrMoRE such as yield strength, tensile strength, elongation, impact energy, metallographic structure, inclusion and grain size are measured by the relevant experimental equipment; the data indicators are analyzed and the influence law of heat treatment process on microstructure and properties of 25CrMoRE steel is discussed.

In the paper, according to the basic principle of ultrasonic and the basic processing method of digital signals, the echo signal of ultrasonic flaw detection is collected by the use of electronic instrument VMUS for ultrasonic flaw detection; the filter is designed to perform ultrasonic flaw detection on heavy plate samples, and the effectiveness of signal processing method is verified.

La_1-xCe_x(NiCoMnAl)_5.05(x = 0, 0.25, 0.50, 0.75) series alloy is prepared by induction melting method; the PCT gaseous hydrogen absorption and desorption test is also carried out. The results show, with the increase of Ce substitution amount, the unit cell volume of alloy decreases gradually, and the axial ratio c/a increases gradually; with the increase of substitution amount, the discharge capacity of alloy decreases gradually, and its high rate discharge performance firstly increases and then decreases, and the discharge performance of alloy at x = 0.25 is the best; the cycle life of alloy is gradually improved with the increase of Ce substitution; with the increase of substitution amount, the maximum hydrogen absorption of alloy decreases gradually, but hydrogen desorption plateau pressure increases gradually.

Based on the field debugging of finishing mill units in 2 250 mm hot continuous rolling of Baotou Steel, the main research contents include two aspects. First, it is introduced the main speed control principle of the basic automation level and various speed control function modes, and main contents in the design of the main speed control function are expounded in detail and systematically; second, the problems of speed control and transmission system during the rolling process are analyzed and solved, and the stability of control system is improved. Finally, the strip steel can be steadily and smoothly passed through the finishing mill units to ensure the strip steel quality of the finishing mill exit.

The characteristics of flame rigidity weak and flame instability are generally existed in regenerative heating furnace. In order to optimize the combustion condition of heating furnace, in the paper, the model of regenerative heating furnace is established by mesh generation of simulation software. The combustion condition in the furnace is analyzed and studied, and the most optimized parameters of regenerative heating furnace are obtained.

There are 2 sets of 20 t/h civil heating pulverized coal boilers in Bayan Obo Iron Mine, and the pollutant emission concentration does not meet the national standards and requirements. In order to protect environment and reduce pollution, fiber bag precipitator is adopted for dust removing reformation. Combined with the actual situation of Iron Mine, the purification of flue gas is realized by technologies such as wet desulphurization and low temperature ozonation wet denitration so as to achieve the goal of dust removal, and the effect is remarkable.

In the paper, it is introduced the treatment status of desulfurization waste liquid from the old and new districts in Coking Plant of Baotou Steel and is explained the feasibility and necessity of going into operation for extracting salt from desulfurization waste liquid in the new district from the actual situation. The key and difficult problems, the economic benefits and the environmental benefits of the process for extracting salt from desulfurization waste liquid are analyzed.

According to the overall planning of Baotou Steel New System construction project, the centralized control and management of the New System gas area are realized, at the same time, three supporting unattended pressurization stations of pellets, Maerz kiln and cold rolling gas purification are constructed for the users such as iron-making plant, steel-making plant and cold rolling plant. Through the scientific management and resource allocation, taking the nearby user principle, distributing rationally, applying and improving the level of automatic information management and monitoring. Further optimize the production process, reduce the labor cost and lay a good foundation for realizing cost-saving, profit-increasing and personnel optimization in Baotou Steel.

In this article, it aims at the over-standard bearing vibration of the TRT generator unit of No. 1 blast furnace in Baotou steel after overhaul, analyzes the vibration of generator unit by collecting the four-channel time domain waveform and using the spectral analysis and relevant fault diagnosis theory, and introduces the field kinetic equilibrium technique in vibration processing of the generator. Finally, it comes to a conclusion that the main cause of the vibration is the effect of alignment and looseness, which leads to the oil film instability of the generator. The cause of oil film whirl and the influence of temperature on the medium and small generator alignment are expounded.

In the paper, it is introduced the development of life cycle assessment (LCA) in steel industry at home and abroad, and the specific research contents and research significance for life cycle assessment of rare earth steel in Baotou Steel are discussed in detail. It is pointed out that the research on the life cycle assessment of rare earth steel in Baotou Steel is the important method to realize green manufacturing, ecological design and making green products; it is beneficial to improve the environmental benefits of rare earth steel products; it is also beneficial to the green development of enterprises and the improvement of regional environment.

The effective way to improve the unit thermal efficiency of Thermal Power Plant is to increase the steam pressure and temperature parameters. Therefore, in the premise of the development of supercritical units, the development of ultra-supercritical units is inevitable. In the paper, it is summarized the development history and technical characteristics of ultra-supercritical technology both at home and abroad, and the brief introduction is given for the future development direction. It is pointed out that the development of ultra-supercritical units should pay attention to economic issues and the development of metal materials; the development situation of new ferritic and austenitic steels for ultra supercritical boilers and the high temperature performance of some new steel grades are emphatically introduced.

In the paper, it is introduced the implementation process of ERP cost management module system in the new system of Baotou Steel and partial function of the system. The analysis is given from aspects such as application of activity-based costing theory, system flow of the cost accounting, responsibility of cost accounting. From sales order, implement production and sales integration, ERP information system plays a guiding role in production and operation and product sales of the company.