In this paper, it is introduced the structure, performances, research progress of LaB₆, its demand and applications of nanocrystallization, summarized the preparation methods for superfines and slurry of LaB₆ as well as the application and development process for its heat insulation performance. Finally, its application prospects in the field of transparent heat insulation are forecasted.

In the mining of Bayan Obo Iron Mine, the blasting effect is often unsatisfactory and the safety performance of explosive production is low. In this paper, the causes of the problems are analyzed deeply, the scheme for optimizing the production process parameters and safety performance of emulsion explosive is put forward to improve the quality of emulsion explosive so as to ensure the blasting effect in the mine and improve the efficiency of digging ore.

The ultra-deep perforation for all kinds of lithology in the main stope of Bayan Obo Iron Mine is optimized through a large number of experiments in the blast area based on the blasting work experiences for many years aiming at the unreasonable ultra-deep perforation, especially the problem of larger ultra-deep perforation. As a result, the crushing effect on the top of the blast area and linear meter of perforation are improved, the unit consumption of explosive is reduced, the damages of blast vibration are weakened, the flatness of floor for steps of stope is improved as well as the standardization and quantification of blasting design and construction are perfected to ensure the efficient, high-quality and low-cost operations of each production process in the stope.

Due to the interference of various factors in the actual productions of mine, there are often the sites to be drilled and blasted with extremely irregular shapes. Different plans of blast area and blasting design schemes could seriously influence the final techno-economic indicator of blasting and the work efficiency of equipment. Take the falcate special-shaped blast area as an example, the network design and regional blasting design are reasonably optimized through the systematic site planning and blasting design of blast area. The blasting restriction caused by site space limitation of blast area is well relieved through designing the trenching blast with double initiations network at the first initiation column so that the quality of supply of goods loaded is improved, the blasting costs and effects of blasting on productions are reduced as well as the work efficiency of equipment is improved.

The excavating in the east stope of Bayan Obo Iron Mine has been started since 1958, the belt conveyer system of rock has been put into production since June of 2007 and the maximum capacity of rock dumping is up to 6.25 million t/a until now. With the continuous stretching downward of the stope, the east stope is gradually entering into the period of natural production reduction and the annual amount of stripping rocks of stope is gradually reduced. In 2016, the planned amount of stripping rocks was 4 million t and 3.92 million t of them were transported with the belt conveyer system. The actual production capacity of belt conveyer system is much larger than the annual planned amount of rock dumping and tends to be larger and larger year by year. After analysis and overall consideration, the mode of production organization of east stope is changed and the production technology is optimized. Part of ore is transported to the ore platform of dump with the surplus production capacity of belt conveyer system, then the ore is transported again to the reshipment platform to reduce the transportation costs and improve the utilization rate of belt conveyer system so that the target of reducing costs and increasing benefits is achieved, which is with greater reference significance for management of similar mines.

In this paper, the loads of harmful elements such as the alkali metal, zinc, sulfur and phosphorus in blast furnace of Iron-making Plant of Baotou Steel are calculated and analyzed in detail. Besides, their main sources and proportion in each blast furnace are found out. The influences of them on blast furnace process are expounded theoretically and the corresponding control measures for them are put forward according to the raw material condition of Baotou Steel, which could provide the technical guidance for controlling them in iron making process of Baotou Steel.

In the paper, the operation practices for 3^# blast furnace of Baotou Steel with low blast temperature is summarized. The long-term trouble-free operations of blast furnace and improvement of main technological and economic indicators are achieved through such measures as the reasonable operation system, proper theoretical combustion temperature and standard operations.

In the paper, the size composition and chemical component of a single ore, optimization for the number of layers of windrow for blended ore, BLOCK mode of windrow, multi-stage variable flow and control of running speed for stacker are systematically studied based on the factors affecting the blending efficiency of blended ore. The practicability, economical efficiency and operability are discussed as well as the work modes of windrow for different single iron charges are put forward, which could provide the production data at site for further improving the stability ratio for component of blended ore and reducing the fluctuation for component of sinter caused by composition segregation.

The coke oven gas is a kind of energy gas with the high hydrogen content. The coke oven gas for injection of blast furnace is with such characteristics as providing the high quality reductant for blast furnace, improving the use ratio and value of gas energy and reducing the emission of CO₂ in blast furnace iron making. In the paper, its research achievements and progress at home and abroad are summarized, which could provide the basis of it.

In this paper, it is introduced the general situations of hot tight covering treatment technology for steel slag of Baotou Steel, analyzed the technical problems in the production practices of Baotou Steel as well as provided the solutions to such problems as large-area hardening of steel slag, spray explosion of hot tight covering and short service life of hot tight covering device.

The NO_X in sintering process is mainly from the fuel burning. In this paper, the effects of different amount of urea, CaO and starch as additive to pretreat coke powder for sintering on emission of NO_X in sintering process and the indexes of sinter were studied by sinter pot test. The results showed that when the amount of additive is 0%~1.0%, the more the urea is added, the more obvious the effect of reducing emission of NO_X is, the effect of changing the amount of added CaO on inhibiting generation of NO_X is not great, the emission of NO_X is more by adding starch and the effect of adding amount on the increment is not great as well as the effect of amount of additive on changing the sintering indexes in this range is not great.

In order to meet the rapid growth of demanding light weight automobile wheel steel, Baotou Steel has developed such two wheel steel series products as the dual-phase steel and low alloy high strength steel with 2 250 mm hot rolling production line. They are with different chemical components, production technologies, micro structures and mechanical properties, which could meet the requirements of customers with different processing capabilities. The wheel steels developed by Baotou Steel have all passed such reliability tests as the fatigue test and road test as well as been promoted into the market and the service conditions of users are good.

In this paper, it is introduced the BT150P perforating gun pipe produced with hardening and tempering by Baotou Steel as well as summarized the situation and effects of developing it through designing steel grade, technological test of heat treatment and actual production. The results showed that the perforating gun pipe reached 150 KSI strength level and was with high strength and ductility by the proper heat treatment.

In the paper, the composition design scheme of non-quenched and tempered 36Mn2V steel for drill pipe is put forward and the optimum range of composition is found out through such research methods as mechanical property tests and metallographic analysis. The industrial tests prove that the performances of the steel pipe could meet the requirements.

The hot rolled steel strips products with different specifications for H40 welding socket in most domestic markets are designed with the same C-Mn composition system. Further, the production technologies for special specification of each grade of steel strips are worked out through controlled rolling and controlled cooling process so that the hot rolled steel strips with excellent mechanical properties are manufactured.

In order to eliminate the defect of fish eye on the surface of outer ring of cold rolled material after pickling rolling process, its micro structure and component were analyzed with the metallographic microscope, scanning electron microscope and energy spectrum as well as the effects of straightening and withdrawing weld joint on the defect were compared. The results showed that the defect was the iron matrix and the oxygen was not detected. There were different degrees of fish eye and porphyritic defects on the steel coils at the outlet of tandem mill observed when passing the weld joint without the stretcher leveler, while the defects were not found on the surface of steel coils when passing the weld joint in the stretcher leveler, so the problem could be solved by setting reasonable elongation of straightening and withdrawing.

The hot rolling process for thin plate of CSP of Baotou Steel was studied with the thermal simulation test machine in this experiment. The test results showed that the higher the coiling temperature is, the greater the rolling speed is, the higher the finishing temperature is, the bigger the grain size is after rolling; it is better for grain coarsening to distribute the reduction ratio from big to small. The test results provide the experimental evidence for rolling the qualified base material for cold rolling with the CSP technological conditions.

In the paper, it is found out that the defects at bottom of notch of impact specimen caused by improper processing lead to the test force forms stress concentration again at bottom of notch of specimen in the impact test through analyzing the reasons for the abnormal test results of impact property for J55 casing pipe of Baotou Steel. The normal stress at the notch of impact specimen exceeds the cohesion strength of material before the specimen deforms so that the specimen is easy to tend to brittle rupture and the impact energy of material is decreased in the actual detection.

In the paper, it is introduced the modeling and finite element simulation analysis on driving roll are carried out with the system parameters of rubber belt vacuum filter and finite element analysis software ANSYS. The structure and stress parameters for driving roll of rubber belt vacuum filter during its operation are obtained as well as the optimization measures are further put forward.

In this paper, the main reasons for low efficiency of 15MW condensing steam turbine are found that the salification and scaling of its flow passage and inlet nozzle as well as the foreign matters plug some inlet nozzles through analysis combining with the working conditions of productions. Moreover, the causes for salt deposit are further analyzed and the prevention measures are put forward. The overhaul plan for opening cylinder of turbine is summarized, the salt deposit of flow passage and inlet nozzle was cleaned up with the high-pressure spray as well as the foreign matters in the inlet nozzles were taken out with the endoscope and dust collector. Finally, the fault was solved.

The stable and high efficient operations of the electric control system for hoister of dry coke quenching is helpful to promoting the development of dry coke quenching technology and could provide reliable conditions for the stable operations of electrical equipment. In this paper, it is briefly introduced the electrical control system for hoister, analyzed the electrical control principles from such two points of view as the control principle and development trend as well as further discussed the applications of control system of hoister in the industrial control and industrial productions aiming at promoting the efficient completion of the electric automatic control project for hoister of dry coke quenching, which are for reference only for the related personnel.

In the paper, three types of optical link pilot protection device applied in the microcomputer-based line of mid-voltage power system in enterprises in recent years are introduced as well as the effects of saturation of current transformer on the starting value of protection device and the requirements of communication for protection are expounded respectively according to the characteristics of mid-voltage power system in enterprises. Finally, some suggestions on the equipment selection for mid-voltage power system in enterprises and channel maintenance for optical link pilot protection device are given, which are with certain guiding significance for the actual work.

In this paper, the current situation of water including the circulating water system and the water charging system in Baotou Steel is mainly discussed. Moreover, such improvement suggestions as regulating and controlling the concentration multiple of circulating water reasonably, optimizing the system of adding agentia and perfecting the water balance system are put forward.

In this paper, it is described the development of nickel-metal hydride batteries in electric vehicles, highlighted the applications of nickel-metal hydride batteries in hybrid vehicles as well as studied and analyzed the development situations and trends of hybrid vehicles and nickel-metal hydride batteries. The domestic automobile enterprises will devote greater effort on research and development of hybrid vehicles. In the next few years, the rapidly developed hybrid vehicles will occupy certain market of electric vehicles.