In the paper, the 10-year operating experiences for desalting water station of Coking Plant are summarized. The common problems and treatment for reverse osmosis equipment are discussed combining with the on-site situations and operating data for reverse osmosis membrane and components of desalting water station. The method for judging the pollution of reverse osmosis membrane and main points of chemical cleaning are mainly proposed as well as the reasonable solutions for the problems and failures of pipeline and accessories are found out.

The ammonia distillation system in Coking Plant is studied with the idea and tool of six sigma management as well as its typical improved mode-DMAIC. The operating parameters affecting the stability of ammonia distillation system are found out and the mathematical model is established to determine the range of the parametric optimal solution so that the scientific control of operations is realized, the stability of ammonia distillation system is improved and the economic benefits are created.

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.