In this paper, it is mainly discussed that with the background of promoting transformation and upgrading, improving quality and efficiency for the iron and steel enterprises in new age as well as the guide of high-quality development strategy for Baotou Steel, Iron-making Plant has established the management framework of "ensure safety, environmental protection and stable trouble-free operations of blast furnace, improve technological and economical indicators, reduce costs of pig iron and change work style". There is rapid great progress in production and management, safety and environmental protection as well as technology quality through further promoting the management and technological innovations, which open up a new situation for high-quality development of Iron-making Plant and lay a solid foundation for turning loss into gain of Baotou Steel.

In the paper, it is introduced the goal of stable production is reached and the furnace burden of high basicity pellets + low basicity sinters is realized through analyzing the metallurgical performances and smelting characteristics of high basicity pellets, the continuous practical adjustment of blast furnace as well as making the countermeasures of operations aiming at the production practice of smelting high basicity pellets with 1^# blast furnace of Baotou Steel.

In the paper, the production practices of sintering with dry distillation coal instead of coke powder were studied. The results showed that after adding the small dry distillation coal into sinter, the solid fuel consumption tended toward reducing with the increase of substitution proportion; drum index of sinter was decreased slightly with the increase of proportion of small dry distillation coal. Analyzed from the perspective of environmental protection emission, the purification system load was aggravated, dehydrating effect became worse, smoke of gas desulfurization system was gray and trailed seriously when the proportion of small dry distillation coal reached 70%. Thus, it is more reasonable that the proportion of small dry distillation coal replacing coke powder is controlled below 50% of total fuel.

In the paper, it is mainly elaborated the laboratory test research and production application results of adding Indian fine ore with the present raw material condition and allocation mode of iron charge of Baotou Steel. The results showed that it was beneficial to improve the air permeability of sinter bed to add some Indian fine ore with the present condition that self-produced Bayanobo iron concentrate accounts for 40%. The RDI_{+3.15 mm} of sinter was unchanged, but RI and softening-melting properties tended to become worse after added Indian fine ore.

In the paper, the influence factors for basicity stability ratio of sinters of Baotou Steel are found out and the corresponding solutions are studied by optimizing the sintering parameters and blending process with the raw material condition of Baotou Steel. Based on the structure of ore blending and chemical composition for sintering as well as the analysis of theoretical calculation, the main influence factors for basicity stability ratio and acceptance rate of sinters were the fluctuations of burden yield of quicklime, CaO in iron ore H and SiO₂ in iron ore W. As a result, they were increased by 10.26 and 3.39 percentage points respectively by such measures as strengthening the quality supervision of quicklime, improving batching equipment and intensifying nutrilization and homogeneous mixing of iron ore.

In the paper, the safe and stable production practices of 5^# blast furnace of Baotou Steel at later stage of campaign are summarized. The safe production and stable trouble-free operation of furnace condition are realized by continually optimizing operation system and adopting effective furnace protection measures with the actual production conditions that there are more harmful elements in raw material, coke quality decline gradually and the blast furnace is at later stage of campaign.

In the paper, the systematic governance for the higher air leakage rate of 2^# sintering machine during medium maintenance in No.1 Sintering Workshop is elaborated. The causes for the air leakage at each position are analyzed and the solutions are put forward. As a result, the air leakage rate of sintering machine is decreased remarkably, which plays an important role in energy saving and consumption reduction as well as improving the sintering production and quality.

With the continuous improvement of SO₂ emission standards for sintering flue gas, the two 210 m² sintering machines in 1^# Sintering Workshop of Iron-making Plant cannot discharge to reach standard when start to resume production. With the research and analysis on desulphurization efficiency and influence factors for concentration of SO₂, the hourly discharge rate to reach standard of SO₂ when sintering machine starts to resume production gradually reaches 100% from 0 so that the air pollution is reduced through production practices by re-optimizing the corresponding parameters and processes for starting machine of sintering process without the influences of extreme conditions.

In the paper, it is described the blast furnace operation instruction is laid down based on the daily change of furnace condition with coke quality reduction through standardized operations of blast furnace. The furnace condition becomes stable and long-term trouble-free operations of blast furnace are realized in Iron-making Plant through strengthening management and control of blast furnace as well as organizing the related technology workers to carry out daily examination and weekly analysis to find out the subtle changes of furnace condition in time and adjust them.

In the paper, the influence factors for sinter production of 265 m² sintering machine in Iron-making Plant of Baotou Steel are analyzed. With the existing production line, such measures as increasing the utilization coefficient and reducing inefficient operations are proposed and implemented so that the sinter production is steadily increased from 4.81 million t in 2016 to 5.34 million t in 2017, which makes a contribution for improving the ratio of sinter put into furnace and reducing the production costs of iron making.

In this paper, the important way for removing alkalis is determined to be the blast furnace slag and the main way for removing zinc is determined to be the fly ash through analyzing the content of such harmful elements as K, Na and Zn in crude fuel for blast furnace of Baotou Steel as well as the balance calculation of output and discharge. Moreover, the methods and measures for reducing the enrichment of alkali and zinc in blast furnace are discussed. The effects of harmful elements on blast furnace are effectively reduced by such measures as controlling the content of alkali and zinc in incoming raw materials, dealkalizing and dezincification for scraps as well as decreasing basicity of slag and adsorption of lumpy zone.

The stability of 4^# blast furnace of Baotou Steel became worse and the fluctuation became more with the continuous deterioration of crude fuel condition. The stability ratio of furnace temperature is increased significantly and the long-term stable trouble-free operation of 4^# blast furnace is realized through reasonably matching the operating duties, keeping the two gas flows reasonably distributed, controlling reasonable T_f value, strengthening tapping iron management in cast house and operations in furnace as well as implementing the standard operations.

In the initial stage of production for 6^# blast furnace in Iron-making Plant of Baotou Steel, the hydraulic clay gun was rotated horizontally when plugging tap hole due to its design defects. In order to ensure the hydraulic clay gun to plug tap hole smoothly, the designed elevation of the top surface for side of in and tap drain was lowered by 250 mm so that the vertical height of it and tap hole center line was 375 mm. As a result, the jet of slag and iron was prolonged when tapping, the impact abrasion of tap drain was intensified and its service time was shortened. The impact abrasion of jet of slag and iron to tap drain was reduced and its service life was prolonged by improving the sizes of its each part so that the goal of reducing the labour intensity and refractory consumption was achieved.

The iron making is a high-risk metal smelting industry and there are many unsafe factors. In recent years, various production accidents in the industry stay at a high level, so the safety situation is more serious. Iron-making Plant takes the idea of "comprehensive safety, intrinsic safety and continuous safety" as well as insists on the principles of "manage production, business and industry must manage safety" "person in charge is responsible" and "party and government are with the same responsibility, double duty for a post". The safety grid management is implemented in the whole plant so that the safety production responsibility system is strengthened as well as all safety management systems and operating instructions are implemented.

In the paper, it is analyzed the causes and summarized the treatment experiences for temperature increase of 5^# blast furnace hearth sidewall of Baotou Steel. As a result, it is effectively controlled within a safe range by implementing the furnace protection measures and adding titaniferous furnace burden for furnace protection so that the safe production and long service life of blast furnace are ensured.

In this paper, the process of replacing SIEMENS S5 115U control system of ring crane for 4^# blast furnace of Iron-making Plant of Baotou Steel with SIEMENS SIMATIC S7-300 PLC is mainly introduced. Moreover, the main hardware constitution and the implementation method for the software function of the system are given; the transformation plan for control system of ring crane and the applications of core component FM351 are especially elaborated.

In the paper, the maximum value of load for the chute to each component of distributing device in the entire rotation and tilting process is calculated by analyzing the structure of BGIII distributing device of Baotou Steel. The load capacities of motor and oil cylinder are checked and calculated by establishing the reasonable mechanical model, which has proved the original design and type-selection were reasonable, provided the basic data support for the structural improvement and stress calculation of other components as well as the theoretical support for the structure optimization of distributing device.

In this paper, the vibration of rolling ring of mixing machine caused by serious abrasion and deformation is analyzed as well as the causes for vibration of mixing machine are found out through long-term tracking measurement. The vibration of barrel is effectively reduced even eliminated by grinding rolling ring of mixing machine with grinding machine, which makes the sintering productions stable.

In the paper, the experiences of flushing the hydraulic system on furnace top when overhauling blast furnace of Baotou Steel are summarized based on such characteristics as the great fall of height for hydraulic pipeline and long hydraulic pipeline on blast furnace top. The reasonable flushing scheme is formulated by calculating the component parameters in flushing.

In the paper, the demodulation method with differential-based empirical mode decomposition combining with the autocorrelation noise reduction and wavelet packet decomposition is proposed aiming at the problems that the nonlinearity and nonstationarity of vibration signal for rolling bearing of booster fan for desulfurization of sintering cause the fault features are difficult to be extracted and identified, which provides a new approach for fault diagnosis for rolling bearing of booster fan.

In the paper, the main influence factor for the large scrap quantity and low output per machine-hour when milling with HP type medium-speed mill of Iron-making Plant of Baotou Steel is determined to be the air inlet of nozzle ring through the research analysis on site. The scrap quantity is greatly reduced with three times of modifying nozzle ring so that the goals of increasing the output per machine-hour as well as energy saving and consumption reduction are achieved.

In the paper, the technological process and running state for the cooling system of 6^# blast furnace of Baotou Steel are introduced. The causes of damage for the cooling stave are elaborated combining with its applications. The service life of blast furnace is prolonged by such measures as strengthening daily management of cooling system, adjusting cooling parameters in time, strictly controlling the cooling wall temperature and careful maintenance of cooling stave.

In the article, the existing problems of SUPCON distributed control systems (DCS), JX-300X and ECS-100 are introduced respectively as well as they are analyzed in detail based on the relevant theories combining with the actual on-site situations. As a result, different solutions are put forward, the relevant hardware is replaced and software system is upgraded so as to eliminate the hidden troubles of system and achieve the desired effects.

The blast furnace top gas recovery turbine unit (TRT) is one of the technologies for energy recovery in modern iron and steel plants. The top pressure of blast furnace is controlled by the angle of stator of turbine and the turbine drives the generator to generate electricity at the same time so that the potential energy of high-temperature and high-pressure gas is converted to electric energy as well as the wasted energy of blast furnace gas in the pressure reducing valves is recovered. This technology is with good environmental protection benefit and remarkable economic benefit.

With the increasingly serious form of environmental protection, it is extremely urgent to enhance the awareness of environmental protection and increase the environment protecting management level. As a large polluter, the pollutant discharged by Iron-making Plant accounts for more than half of that for the whole company each year. It has become a problem that needs deep thinking for environmental protection practitioners how to realize clean productions. The Iron-making Plant has established and perfected the environmental protection management system through years of efforts and explorations. As a result, a green iron-making plant with pollutant discharge amount reduced year by year and all the daily mean values of online state-controlled pollution sources met the standard has been created.

In the paper, it is discussed how to reduce the labor costs in Iron-making Plant of Baotou Steel under the condition of reducing excess capacity. The labor costs for per ton of iron are greatly reduced and the per capita output of iron is greatly increased with a series of effective measures such as reducing excess capacity, organizational restructuring, improving management concept, optimizing personnel, post, age structure and fund allocation.

In the paper, the design and implementation of overtime workflow statistics platform based on ASP. NET are introduced. It is designed and developed in view of the procrastination and inefficiency in the approval process of the OA workflow in Iron-making Plant based on the current information construction situations. The efficiency of workflow approval could be improved through establishing the management assessment methods based on the statistical data of the platform.

In the paper, the effects of different inlet air modes on the pulverized coal conveying speed are studied by studying the existence form of pulverized coal in cone pump with what-if analysis of theory after charging. With many field tests, it is found out that the pulverized coal conveying speed of cone pump is related to the inlet air modes, relative position of its air inlet pipe and discharge tube, so the pulverized coal conveying speed and operation efficiency of cone pump could be increased by improving the form and position of its air inlet pipe and discharge tube.