The niobium element in sample is determined with X-ray fluorescence spectrometer and spectrophotometry respectively. The analytical results of the two methods are consistent with standard and reference values as well as the relative standard deviation (RSD) of ten times of determinations is smaller than 10%. The results of analysis and detection with X-ray fluorescence spectrometer is as three times as that with spectrophotometry so that the analysis cost is greatly reduced. Therefore, the X-ray fluorescence spectrometry is more suitable for current production analysis of company.

The new understanding of ore-controlling structure for ore deposit of Bayan Obo is put forward. It is considered that the original syncline structure does not exist. The ore deposit of Bayan Obo is controlled by the Ulan Bragg major fracture and wide groove fracture, which are intersecting at the location of Bayan Obo ore deposit. Bayan Obo ore deposit is deeply controlled by major fracture and the ore-controlling structural model is established.

There is a great deal of raw coke oven gas of 700~800 ℃ in the process of mixing coal transforming to coke in the coking chamber of coke oven and it is containing with a lot of waste heat. The goals of energy conservation and emission reduction as well as developing circular economy are realized by selecting and applying new waste heat recovery device suitable for the company as well as applying it in the production practice combining with the actual situations of waste heat generated in production of coke oven.

In this paper, the basic characteristic indexes for serpentine of Hanzhong are studied. The proportioning and adding scheme for serpentine of Hanzhong instead of serpentine of Nanyang is put forward according to the basic characteristics and physical and chemical indexes of the mine as well as the production is carried out on the 500 m² sintering machine of Baotou Steel. The production results showed that the physical and chemical indexes and metallurgical performances of sinter were improved by proportioning and adding serpentine of Hanzhong compared with serpentine of Nanyang as well as the solid fuel consumption of sinter increased.

The trouble-free operation of blast furnace is achieved through taking such technical measures as strengthening the management of raw fuel, reducing powder into furnace, stabilizing operation system, unifying the operation of four shifts and strengthening management of tapping iron in cast house. The quality of molten iron was significantly improved in September of 2021, the average values of sulphur content and silicon content in molten iron of the whole month reached 0.025% and 0.58% respectively and the ratio of first-grade products reached 93.02%, which was 43.85 percentage points higher than that of last 12 months so that the better economic results have been achieved.

In this paper, the operation of tapping iron in front of 6^# blast furnace of Baotou Steel in later stage of campaign is summarized. In view of such problems as the water at taphole, splashing at taphole, coal gas leakage, block of coke at taphole, short iron flow time and unstable furnace temperature caused by a lot of damages of the sixth sections of cooling stave of 6^# blast furnace in later stage of campaign, the safe production is realized and the work of the taphole in front of the furnace is improved by improving the operation system in front of the furnace and taking effective preventive measures.

In this paper, the multi-objective optimization system of bottom blowing argon is established by selecting different technological parameters at each smelting stage, considering the different metallurgical technology objects at each stage in smelting process of refining furnace, analyzing and studying the bottom blowing technology of refining furnace. The parameters of bottom blowing argon at each stage are optimized so that the stir efficiency is improved and the refining time is shortened, which provide the basis for the bottom blowing argon system.

The production manufacturers' feedback of commercial vehicle is that the design of original car is adopting the Q345 and the designed carrying capacity is that the instantaneous carrying capacity of baseplate is less than 600 MPa. Since the current requirements for fuel economy and power load capacity of commercial vehicle are gradually increased, the optimization of materials for car body and lightweight for current vehicle model is in urgent need. In the paper, it is introduced the current material is replaced with the material to promote, the comprehensive analysis of car hopper is carried out with the simplified calculation method and finite element analysis as well as the parametric modeling and optimization calculation of design variables are carried out by taking the car hopper of heavy-duty dump truck as the objective to verify the weight loss of corresponding parts in the case of ensuring to accord with the original carrying capacity.

In view of the current situation that there is no related standards of unified integrity management effectiveness evaluation at home and abroad, an effectiveness evaluation index system for gathering and transportation pipeline based on the regional characteristics of oilfields is proposed in the paper. Under this index system, the five pilot schemes are with the quantitatively effectiveness evaluation and analysis by analytic hierarchy process (AHP) and data envelopment analysis (DEA). The current situation of integrity management effectiveness for pipeline in the oilfield area can be scientifically and objectively reflected based on the result-oriented effectiveness evaluation system as well as the targeted suggestions are put forward to improve the quality of pipeline management. The results show that DEA focuses on the objective and quantitative effectiveness evaluation of indicators, while AHP focuses more on the subjective and qualitative effectiveness evaluation of indicators. It is of great significance to select appropriate effectiveness evaluation method based on the value of index for pipeline management and hint of production efficiency of oil and gas field.

In this paper, the causes of oxidized burning loss for heating furnace of 4^# production line of Long Product Plant of Baotou Steel are analyzed in detail. The improvement measures are proposed according to the working principle and characteristics of the heating furnace so that the oxidized burning loss and accumulation of iron scale in the furnace are effectively reduced, production efficiency is improved and some economic benefits are obtained.