Due to the changes of the industry situations, mining enterprises face many difficulties in the production organization, so the production and equipment efficiency is improved and the consumption is reduced with the lean production management methods in practical applications as well as taking the innovations as the power and taking the projects as the central tasks by constructing the lean production management system of enterprises and combining with the actual productions. Moreover, such problems as the existing bottleneck restriction, inventory, equipment failures and blocked information in the process are eliminated by using a variety of innovative approaches and tools to carry out the lean production management and construct lean production management system to help the healthy development of enterprises.

In 2016, the rate for bending and damage of tuyere of large blast furnace of Baotou Steel achieved 70%, which became the main restraining factor for intensified smelting of blast furnace. In this paper, it is introduced the bending and damage of tuyere were eliminated through such methods as adjusting the lower blast parameters, controlling the middle heating load and optimizing upper charging system to maintain the reasonable operational furnace profile. The results showed that the bending and damage of tuyere could be effectively eliminated by controlling reasonable operational furnace profile.

In Coke Chemical Engineering Branch Co. of Inner Mongolia Baotou Steel Union Co., Ltd., there are four 6-m coke ovens heated with blast furnace gas. Due to the production technology of blast furnace, the temperature fluctuation of blast furnace gas is bigger, the adverse effects of blast furnace gas temperature increased from about 35 ℃ to over 45 ℃ on energy consumption of processes for coke ovens, heating equipment, gas flowing rate and thermal losses of oven body in the production are mainly analyzed.

In this paper, the solutions for the existing problems of configuration of measuring equipment, metrological confirmation of verification or calibration, monitoring of measurement process and formulating interval of periodical confirmation for non mandatory verification measuring equipment are proposed aiming at the existing prominent problems of weak links in the present metrological management of company in product certification as well as the significance of metrological management for the product quality assurance of enterprise. Moreover, the risk for inaccuracy of metrical data is prevented and controlled to realize the sustainable development of enterprise.

The gelatinous layer index of coking coal is with the important guiding significance and consideration value for guiding coal blending for coking and predicting coke strength. In the paper, the main factors affecting the data accuracy are determined and the implementation measures for testing data accuracy are put forward through analyzing such influence factors as coal sample preparation, testing equipment and detection process.

The phosphorus content in phosphating wastewater generated in the coupling production line of a steel tube company was higher and the effect of original coagulation treatment process was not good, so the technical transformation was necessary. The experiment was with three stage coagulating sedimentation and dephosphorization filter unit for adsorption filtration of high concentration phosphorus wastewater. The results showed that the TP of effluent discharging after treatment is nearly completely removed (lower than the national primary standard for comprehensive wastewater discharge 0.5 mg/l) for the phosphating waste liquid with the TP concentration of 5 000~15 000 mg/l and the phosphating wastewater with the TP concentration of 100~200 mg/l as well as the removal rate of TP can be stabilized at about 99%.

In the paper, some basic characteristics of rare earth in Bayan Obo Mine and the present situation of grading rare earth concentrate in North Rare Earth High-tech Co., Ltd. are introduced; the concentration, grade and granularity of overflow mine obtained by the first section permanent magnetic tailings of Bayan Obo Magnetite after stage-grinding and stage-separating in Dressing Plant of Baotou Steel with swirler are analyzed; the technical route and technical index for grading high grade rare earth concentrate with overflow mine of swirler are established, which lay a foundation for the smooth development of industrial test. The industrial grading for overflow of swirler has been realized in the Rare Earth Dressing Plant with the original production technology.

The chemical pickling is intended to be used for iron concentrate slurry pipeline descaling, but it may cause the pipeline leakage. In the paper, the type, concentration, reaction time and the influence degree on iron concentrate slurry pipeline of acid were determined through the scale quality analysis, scale dissolution experiment, experiment for test block of pipeline material, weld experiment and tube test. The experimental results showed that the hydrochloric acid pickling was safe.

In this paper, it is described that when rolling the H630 mm × 200 mm × 15 mm × 20 mm H beam with Q420NQR1 produced by Baotou Steel, there are such situations as abnormal microstructure and low temperature impact toughness fluctuation. The abnormal microstructure are eliminated, homogeneity of microstructure is greatly improved and low temperature impact toughness fluctuation is effectively controlled through optimizing the composition and rolling process.

In the article, it is discussed the technology for producing the bridge steel products with the yield ratio no more than 0.84 is found out with the advanced steelmaking and steel rolling equipment of Rare Earth Steel Plate Plant of Baotou Steel through adopting the composition design of medium carbon + high manganese + microalloying as well as reasonable technology and measure of controlled rolling and controlled cooling. As a result, the bridge steel with such characteristics as good formability, weldability and low temperature toughness could be produced with volume production.