In this paper, the development situations and trend of automatic control system for blast furnace are deeply analyzed as well as such existing problems as aging of software system and complex operation methods are pointed out. With the development of artificial intelligence (AI) technology, it becomes a new direction to combine automatic control technology with AI. Under the background of carbon peaking and carbon neutrality, higher requirements of accuracy and stability of control system for blast furnace are put forward for applications of hydrogen metallurgy technology as well as energy management and digital transformation become the new issues. Meanwhile, the development of control system for blast furnace prompts knowledge structure of operating personnel to transform to integration as well as more high qualified and professional integrated talents are needed. The research showed that the process control of blast furnace in our country could reach the world-class level by continuously improving the interactions of theories and practices, cultivating professional talents and optimizing the system.

The cold area process is the key link in production of heavy rail and section steel, its operating efficiency and level of intelligence directly affect the quality and production cost of final products. With deep implementation of the national development strategy for high-end and intelligent manufacturing industry, it has become the inevitable choice for steel enterprises to enhance their core competitiveness to improve the levels of automation and intelligence of production lines. In the article, the integrated applications of such key technologies as industrial visual recognition, precise length measurement of dynamic steel billets with laser, intelligent voice alarm and intelligent die for first-forming based on AI (artificial intelligence) are the core content as well as their implement methods and application effects are elaborated, which could provide the practical references of technology applications for intelligent transformation of the same type of production lines in the industry.

As the core component of electrocoagulation technology, the structure and performances of metal plate directly determine its treatment efficiency and operating costs. Traditional single metal or conventional bimetallic plate is with such problems that electrode is easy to be passivated, corrosion rate is rapid and reaction efficiency is low. In this paper, the advantages of gradient alloying design process for bimetallic plate are focused as well as its feasibility and unique advantage of key indexes are demonstrated from such aspects as proportion of metal materials, inhibition effect of electrode passivation and removal rate of fluorine through actual data of operations under the same reaction conditions.

The carbon content in high-carbon ferrosilicon is determined with high frequency induction combustion infrared method. The optimal analysis conditions are determined through a series of experiments such as weighing sample as well as addition amount of pure iron, tin granular and tungsten particle. The experimental results showed that the molten state of sample was good, relative standard deviation of precision experiment results was 0.59% and adding standard recovery was 99.16%～100.34% with the addition sequence of 1.50~1.70 g pure iron, 0.08~1.20 g sample, 0.30 g tin granular and 1.30~1.50 g tungsten particle, which could meet the requirements of chemical analysis. This analytical method is with simple operations, rapid analysis as well as high accuracy and precision, which could meet the requirements of incoming inspections of high-carbon ferrosilicon.

The real-time online monitoring device for faults of components for main driving axle is designed by taking the variable quantities of central position of main driving axle body of rolling mill as the characteristic quantities for faults of components for main driving axle, tactfully combining with the component structure of existing device based on analyzing the characteristics for faults of components for main driving axle of heavy plate mill. The practical applications verify that it is effective for real-time online monitoring of faults of components for main driving axle of heavy plate mill and equipment protection so that it is with more values of industry promotion and applications.

The operating efficiency of pump station for circulating water system (the core link of cooling for rolling production line and equipment protection) directly affects rolling quality and energy consumption. In the paper, it is systematically elaborated the full process practices of establishing intelligent pump station through such technologies as integrated variable frequency speed control, closed-loop regulation of dynamic pressure, intelligent voice warning and long-distance monitoring by taking the transformation project of unmanned pump station in Long Products Plant of Baotou Steel as the object of study. The long-distance centralized control for status of pumping set and intelligent management of water balance are realized through innovatively replacing traditional power frequency drive pattern of asynchronous machine with frequency conversion control of rare earth permanent magnet synchronous motor combining with adaptive pressure regulation algorithm based on the rolling requirements in project. As a result, the electricity cost is saved by CNY 1.025 3 million Yuan annually, fluctuation range of pipe network pressure is reduced to ±0.08 MPa and investment recovery period is about 2.18 years.

In this paper, the desulfurization effects of wet desulfurization process of ore sintering flue gas with different operating conditions, mixing ratios and operating parameters simulated by establishing simulation model with the ANSYS and MATLAB are studied with the composite desulfurization agent prepared by mixing desulfurization ash and limestone. The results showed that the desulfurization effect could reach 99.3% and concentration of SO₂ at outlet was not more than 35 mg/m³ with the operating conditions that concentration of SO₂ at inlet was 5 000~6 000 mg/m³ and optimal mass mixing ratio of desulfurization ash to limestone was 15%.

In this paper, the application of medium and low temperature denitration technology after wet desulfurization of ore sintering flue gas is studied with the pilot test by taking the flue gas after wet desulfurization in an iron and steel plant as the object of study. The 20-hole modified vanadium-based honeycomb-type catalyst is selected, average value of NOx at outlet at 230~240 ℃ is 35 mg/m³, which could meet the requirements of ultra low emissions. After 3 months of stable operations, there is no downtrend for catalyst activity, pressure differential of system is stable and there is no blockage. Compared with the medium and high temperature selective catalytic reduction (SCR) by estimation, the consumption of blast furnace gas could be reduced by about 30%, which verifies its feasibility.

The ceramic ball is with such characteristics as low density, good wear resistance and long service life so that energy consumption could be reduced by over 15%. In order to reduce energy consumption and improve regrinding efficiency of iron rough concentrate of a magnetite beneficiation plant, the characteristic tests of ore grinding with different grinding media including ceramic ball, steel ball and ceramic ball+steel ball are carried out by taking the sand setting materials of secondary grading in the beneficiation plant as the research object. The test results showed that it was completely feasible to apply ceramic ball to replace part of steel ball as the grinding medium of secondary stage fine grinding.

The alkaline oxide pellet used for blast furnace ironmaking production in Baotou Steel is prepared with self-produced iron ore concentrate of Bayan Obo and part of Inner Mongolia magnetite concentrate by process of traveling grate-rotary kiln-rotating annular cooler. In the initial stage of industrial production of alkaline oxide pellet, the compactness of green pellet is poor, proportion of binder is high, compressive strength of finished pellet is low, amount of powder in process system is great and hot pellet is frequently discharged from rotating annular cooler so that on-site production is affected. In order to solve the above practical problems in pellet production, the performances of raw materials used in pellet production are optimized to improve compressive strength of alkaline oxide pellet. The specific surface area of raw materials used in pellet production is increased, compressive strength of alkaline oxide pellet is improved from 2 098 N to 2 358 N, amount of powder in process system is significantly reduced and the phenomenon of hot pellet discharged from rotating annular cooler is significantly reduced by processing the ore used for production of alkaline oxide pellet with the process of high-pressure roller grinding.