In this paper, it is introduced the feasibility test of adding new-type binder instead of bentonite is carried out aiming at the production situation of high content of SiO₂ in pellet due to the high proportion of bentonite for pellet with belt type roasting machine. The results showed that the grade of pellet increased by 0.45 percentage points and the content of SiO₂ reduced by 0.60 percentage points after use new-type binder instead of bentonite so that the pellet could better meet the smelting demands of blast furnace.

The composition of desulfurizing waste liquid is stable, it is with toxicity and corrosivity as well as its treatment is so difficult that it belongs to the industry problem. In this paper, it is discussed the generation, characteristics and harms of secondary salt for desulfurizing liquid as well as the main treating methods for desulfurizing liquid currently used in the coking industry. Moreover, it is briefly analyzed such processes as the coal blending, salt extraction and acid manufacture.

In this paper, the successful tapping of 7^# blast furnace of Baotou Steel after long-term blowing down is mainly summarized. It is the first time to use the "embedded observable oxygen lance technology before reblowing of blast furnace" and a set of methods are summarized by taking such measures as the scheme formulation before blowing down, previous preparation and rational use of oxygen lance to guarantee the successful tapping of blast furnace after long-term blowing down, which lays a foundation for rapid recovery of furnace condition.

In this paper, the practice on increasing production and reducing consumption for 8^# blast furnace of Baotou Steel is summarized. The blast furnace operation and inner profile are gradually rational through such measures as strengthening management of raw fuel, adjusting upper and lower parts, optimizing blast furnace operation, increasing top pressure, blast temperature and coal ratio, enhancing process control, personnel training and equipment management as well as reducing delay ratio so that the technological and economic indicators of blast furnace are improved. In the first half year of 2020, the utilization coefficient of blast furnace reached 2.205 t/(m³·d) and the fuel ratio was 548 kg/t.

In this paper, the practice on reducing cost of pig iron for 4 150 m³ blast furnace of Baotou Steel is summarized. The main technological and economic indicators of blast furnace are improved as well as the cost of pig iron is reduced by such measures as strengthening the management of raw fuel into furnace, improving the level of blast furnace operation, maintaining the furnace condition stable and trouble-free, strengthening cost management and other management levels as well as optimizing manufacturing technique. The cost of pig iron in the first half year of 2019 was reduced by RMB 88.1 Yuan per ton of iron compared with that of the corresponding period of 2018.

The Bi-PCI technology is with such characteristics a s improving the air permeability of stock column for blast furnace, protecting the internal organizational structure of coke in furnace, increasing the usage amount of pulverized coal and enhancing the smelting strength of blast furnace. The industrial test of the process has been carried out for 4 150 m³ blast furnace of Baotou Steel for one and a half months. The results of systematic study on important parameters of blast furnace, microstructure and drum strength of coke at tuyere showed that the technical and economic indicator of blast furnace could be effectively improved as well as the deterioration of coke in furnace could be restrained with the Bi-PCI process.

In this paper, it is introduced the application and implementation of the technology of recycling high temperature flue gas of big flue for two 500 m² sintering machines of Baotou Steel as well as the technical problems existing in production practice. The solutions are proposed by analyzing the production parameters and field conditions combining with the operations, which can be as references for maintaining other similar associated equipment. The waste heat recovery is realized and unit process energy consumption in sinter production is reduced while guaranteeing the production to be trouble－free.

IOC6 mineral powder is with such characteristics as dense particles and difficult to produce liquid phase during sintering. It forms a complementary relationship with the characteristics of iron concentrate of Bayan Obo that it is easy to form liquid phase during sintering process. The experimental research showed that the production and quality indicators of sintering of Baotou Steel could be improved by adding 10% IOC6 mineral powder instead of PB powder with a large proportion of iron concentrate of Bayan Obo.

In this paper, the new production technologies for oriented silicon steel in industry in recent years are summarized, seven of them including thin slab casting and rolling technology, refining magnetic domain, asynchronous rolling, increasing content of Si, replacing monomer cover annealing with tunnel continuous high temperature cover annealing, thinning thickness and double oriented silicon steel are introduced. With these new production processes, the magnetic induction intensity can be improved, iron loss and such magnetic characteristic as coercivity can be reduced as well as the effects of high efficiency, energy conservation and cost reduction are good.

Since the production line of 4 100 mm wide and thick plate of Baotou Steel was put into production, the roll consumption has been higher and the cost of per ton of steel has been increased due to such problems as stock removal, changes of steel grade and specification as well as accident and equipment status of rolling mill. The service efficiency of roll is improved and roll consumption is reduced by taking such measures as controlling stock removal, optimizing production scheduling, reducing abnormal roll change caused by accidents and perfecting rolling mill.

In this paper, it is expounded that the specification of product produced by the high-level modern continuous pickling line of hot-rolled plate is (1.2~8.0) mm ×(800~1 680) mm and the strength is 780 MPa. In the process of hot rolling to pickling, the influences of scale and pickling process on the surface of steel belt are analyzed and studied through laboratory and field experiments so that the problem of blackening on surface of pickling steel belt is improved.

The steel grade for BT110TS special casing highly resistant to collapse and hydrogen sulfide corrosion designed in the article is 26CrMoVNbRE, the small-batch trial production is with converter smelting, LF refining, VD vacuum treatment, continuous casting of round billet, heating with annular furnace, piercing with cone roll piercing mill, PQF tandem rolling, stretch reducing, quenched and tempered process as well as the outer diameter and wall thickness, mechanical properties, microstructure, residual stress, collapse resistance and SSC hydrogen sulfide corrosion resistance of casing are detected. All the indicators could meet the technical requirements, the recommended value of standard for collapse resistance was over 38%, NACE 0177 standard A method was used, loading stress was 606 MPa, sample did not break after 720 h and surface of sample was smooth without cracks.

In this paper, it is elaborated the repair of rolling-mill housing in the production line of heavy rail with laser cladding technology on site of Rail and Beam Steel Rolling Plant of Baotou Steel in detail, tracking of recovery for accuracy of rolling mill after the repair as well as summarized the mature and stable scheme for recovering the accuracy of rolling-mill housing, which could lay the foundation for producing high-quality products.

The market of special pipe for gas cylinder is broader and broader, the Φ232.0 mm × 5.5 mm gas cylinder cannot be rolled with the original Φ238 mm pass of 180 work zone. In order to expand the market as early as possible, the Φ242 mm series of pass for tandem mill is developed based on the parameters of pass for existing tandem mill and distribution method of top coefficient of elongation as well as the original Φ230.3 mm mandril is applied so that the production of Φ232.0 mm × 5.5 mm gas cylinder is realized. It is put into service and received a favorable reception of customer.

In this paper, it is introduced the evolution law of mechanical properties and microstructure for BT140TT high anti-collapse casing with the specification of Ф141 mm × 13.5 mm produced by Steel Tube Co. of Baotou Steel with different heat treatment processes, the orthogonal experiment of heat treatment process showed that the optimum heat treatment process of BT140TT was quenching at (890 ± 10)℃ and holding for 40 min, tempering at (660 ± 10)℃ and holding for 90 min, material yield strength≥965 MPa and impact energy at 0 ℃ ≥100 J, which could meet the design requirements of BT140TT anti-collapse casing as well as the integrated requirement of high strength and toughness could be realized.

The 20Mn2A hot rolled wire rod for round-link chain is trial-produced with such equipment as the 100 converter, LF refining, continuous casting with billet and Morgan's fifth-generation high-speed wire rod mill as well as combining with narrow composition control of C and Mn, formulating reasonable controlled rolling and cooling process. The results showed that the performance indexes of product could meet the requirements of standard and technical agreement so that using effect was better.

In this paper, the system component composition, system design, systematic principle and system features of AGC hydraulic control system for wide and thick plate mill of Baotou Steel are introduced and analyzed. Moreover, the troubleshooting and diagnosis of typical faults for the hydraulic control system are analyzed as well as the steps of troubleshooting and treatment for them are summarized and introduced combining with the experiences of on-site maintenance and fault handling for AGC hydraulic control system for wide and thick plate mill, which can be as references for design, maintenance, fault diagnosis, system optimization and improvement of AGC hydraulic control system for rolling mill.

In this article, the components and working principle of the robot of screwing inner ring in tube body introduced for the production line of casing processing of Baotou Steel are briefly introduced. Such problems as the high labor cost, hostile construction environment and the standard working of tightening torque for thread protector in the entire process control cannot be realized are solved through replacing the manual screwing and installation of inner thread protector with robot of screwing inner ring in tube body.

The lift pumping station is the common solution to collect field backwater in modern industry. When the water level of pump station is high, the sewage pump is started for drainage and when the water level is low, the sewage pump is shut down, so the control system is required to be highly reliable. In this paper, it is proposed to collect the liquid level with double liquid level meter, analyze and judge the changes of liquid level for liquid level meter through PLC to determine the running status of liquid level meter and remind maintenance personnel to dispose in time. The practices prove that the reliability is so high that full automatic operation could be realized completely.

The distributing device on 4^# blast furnace of Baotou Steel is manufactured by WOODINGS Company of the USA. During the repair of spare parts, its internal part, crank is with the domestic reconstruction. Two months after the production line was put into service, the crank was fractured. The modeling analysis of crank is with the software Solidworks to study the reason of fracture for crank and formulate the improvement project so that the on-site problems are solved reasonably.

The "V" type roller rotation speed model and action time model of upper roll for transport frame are established by analyzing the principle of ultrasonic flaw detection aiming at the control of end-upsetting steel tube in inspection area so that the movement condition of steel tube is controlled accurately and the effectiveness of detection function for diagnostic machine is guaranteed.

The source, composition and treatment technology of waste water and gas produced in the process of manufacturing single rare earth carbonate with rare earth ore concentrate of Bayan Obo of Baotou by such processes as high-temperature roasting of concentrated sulfuric acid, water leaching, transformation, extraction and carbon deposition are elaborated. In this paper, its resource process route is analyzed based on the long-term research trial on treatment technology of waste water and gas as well as combining with the actual production conditions of industrialization for its treatment technology, which is hoped to play a positive role in green sustainable development of rare earth industry.

In the paper, the importance of stability of heating value for operation of CCPP unit is introduced. The feasibility and reliability of operation for CCPP unit with low heating value are explored through optimizing the unit protection, which is beneficial to the treatment of defects for coking coal system of CCPP unit without shut down so that the economic and social benefits of operation for CCPP unit are improved.

Ferrosilicon is the deoxidizer and alloying agent in steel-making process as well as aluminum content is the more important quality index. It is suggested that the sample should be dissolved with nitric acid and hydrofluoric acid as well as Fe, Mn, Ti and other elements should be precipitated by sodium hydroxide to separate from aluminum so that the aluminum and EDTA can form complex in subacidity for the experiment. Excessive EDTA is titrated with copper sulfate standard solution and PAN is as the indicator. The repeatability limit r and reproducibility limit R of EDTA titration are determined by precision experiment and mathematical statistics to be used for quality decision of method detection to ensure the accuracy of detection results.

In this paper, the analytical method for determining trace mercury in technical hydrochloric acid with the inductively coupled plasma atomic emission spectrometry (ICP-AES) is established. The analytical spectral lines of element mercury are determined by experiment as well as the effects of acidity, power and accompanying ion on determining trace mercury are tested. The method is with such advantages as fast, accurate, high sensitivity and precision. Determine the trace mercury in technical hydrochloric acid with this method, the adding standard recovery is 93.0%~105.2%, RSD ≤ 6.84% and detection limit of this method is 0.001 2 μg/mL, which could meet the requirements for analysis and detection of trace mercury in technical hydrochloric acid.