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.