In the energy consumption of sintering process, solid fuel (powdered coke and anthracite) consumption accounts for 70%~80%, so it is the key to reduce solid fuel consumption for reducing energy consumption of sintering process. In the paper, it is introduced the air leakage rate of sintering machine is decreased to 35% and effective height of sinter bed is increased to 780 mm through such measures as equipment transformation, optimizing technological operations and strengthening production management combining with the existing conditions of raw materials and fuels aiming at the problem of higher solid fuel consumption for 265 m² sintering machine of Baotou Steel; proportion of size fraction of outsourced powdered coke <1 mm for sintering is decreased from 41.02% to 22.72% through revising the purchase standard of outsourced fuels for sintering so that size composition of fuel for sintering is improved. The solid fuel consumption for 265 m² sintering machine of Baotou Steel was reduced to 50.75 kg/t in 2023 through the above measures, which was 1.70 kg/t lower than that in 2021.

There are such situations as wear and track gauge that is out of tolerance as well as such accidents as offtrack of travelling wheel for coke guide and fracture of track in the process of production and operation more than once due to overage service of the track for coke guide of 6 m coke oven of Coal Coking Chemical Industry Branch Co. so that the coke oven stops production frequently. The size of track is determined to be with the height of 1 61 0_{-2}^{+3} mm and center distance of 2 70 0_{-2}^{+2} mm by taking starting points of the tracks at the ends of coke guide as reference as well as combining with the surveying and mapping values of track through on-site measurement and survey. For the construction, old track is completely replaced without stopping production by using the thermit welding method of track joints so that on-site production requirements could be met. This method could be popularized to the replacement of tracks for coke guide in coking industry.

In this article, the stability of old underground space in Sanheming Iron Mine is analyzed with the FLAC^3D numerical simulation software as well as distribution laws of stress, displacement and plastic zone of old space with effects of self weight stress field are studied. It is aimed at judging whether old space is stable to analyze the stability of old space with effects of its self weight stress field in order to provide effective preventive measures for managing old space of mine as well as ensure safe and efficient mining of mineral resources. The stability of old space with effects of self weight stress field is considered to be good through 3D modeling and numerical calculations. The study results can provide references for stability analysis of underground goaf in similar iron mines, which is with certain guiding role in ensuring safe production and reducing geological disaster risks as well as significances to promote sustainable development of mineral resources of Sanheming Iron Mine.

It is helpful for better energy management and optimization as well as realization of sustainable development of enterprises to improve the accuracy of energy measurement. The accuracy rate of data acquisition could be improved by strengthening energy measurement management, perfecting relevant management systems, selecting reasonable sampling points and acquisition and calculation modes as well as using means of data analysis so that the facticity, reliability and fairness of energy data could be guaranteed, which could provide strong supports for such aspects as energy conservation and emission reduction, cost accounting and quality control of enterprise.

In this paper, the continuous cooling transformation (CCT) behavior of undercooled austenite and hardenability at different quenching temperatures of 770 MPa grade steel for crane boom are systematically studied. The critical transformation points of test steel are determined and evolution rules of metallographic structure for test steel at different cooling speeds are analyzed through thermal simulation test. The results showed that complete martensitic structure could be obtained when cooling speed reached above 30 ℃/s. The depth of hardening layer corresponding to 50% of martensitic structure content was 30 mm when hot quenching was at 920 ℃, which showed that test steel was with good hardenability.

As one of key materials in the new energy automobile industry, non-oriented silicon steel for driving motor of new energy automobile is with broad application prospects and huge market potential. In this paper, it is discussed the performance indexes of non-oriented silicon steel for driving motor of new energy automobile as well as briefly summarized current research status of non-oriented silicon steel on such aspects as rare earth modification, optimization of annealing process and practical applications of motor. The overall performances of non-oriented silicon steel for driving motor of new energy automobile could be significantly improved by adding rare earth elements into non-oriented silicon steel, continuously optimizing annealing treatment process and making targeted improvements combining with the requirements of practical applications of motor.

The test steels with different La contents are smelted in vacuum induction furnace under laboratory conditions. The morphology and size of inclusions are studied with X-ray diffractometer, field emission scanning electron microscopy, Bruker energy spectrometer, OTS software and electron probe micro-analyzer (EPMA). The results showed that the inclusions, AlN and Al₂O₃ are modified into La-O-S, La-O-S-Al and LaS as well as inclusion size was decreased from 4.37 μm to 2.92 μm by adding La into X100 pipeline steel. The refinement effect of La on austenite grain size is obvious. With the increase of La content, austenite grain size in test steel is increased from level 5 to level 8.5. After adding rare earth La, the main inclusions in steel are La-O-S and La-O-S-Al of about 2 μm in size with the pinning effect so that austenite grain size is reduced significantly.

In the paper, the blast furnace smelting with large proportion of pellets is summarized as well as the effects of such processes as pelletizing, sintering and blast furnace on energy conservation and emission reduction of steel productions are quantificationally analyzed combining with actual production situations. The results showed that the carbon emission, energy consumption and pollutant discharge amount per ton of steel could be reduced by increasing the proportion of pellets and reducing the proportion of sinter in blast furnace. The study could be as reference for energy conservation and carbon emission reduction in the iron and steel enterprises with blast furnace-converter production process.

Such parameters as the outlet temperatures of crystallizer and secondary cooling section and shell thickness of manufacturing 2 types of rectangular billet with cross-section dimensions of 280 mm×380 mm and 320 mm×415 mm are simulated through high temperature thermal simulation experiments and computer software as well as the production process parameters of manufacturing YQ450NQR1 weathering steel with the billets of 2 different cross sections are compared. The results showed that the low magnification quality of billet was related to amplitude of crystallizer, amount of secondary cooling water, number of strands for continuous casting machine and temperature of exiting secondary cooling section while entering tension leveler. With the decrease of amplitude of crystallizer, increase of number of strands for continuous casting machine and temperature of entering tension leveler, the quality of billet is improved. When the amplitude of crystallizer is ±2.5 mm and temperature of entering tension leveler is greater than 940 ℃ with the condition of weak cold secondary cooling water, the low magnification quality of billet with cross section of 280 mm×380 mm of peritectic weathering steel is better than that of billet with cross section of 320 mm×415 mm.

In this paper, it is introduced the development process and achievements of beneficiation technology study of baiyuneboite. The study and application situations of beneficiation technology of baiyuneboite are introduced from such three stages as focusing on iron, paying equal attention to iron and rare earth as well as comprehensive utilization of resources. Moreover, it is summarized the methods for improving grade and recovery rate of iron concentrate, current situations of beneficiation of rare earth oxide, achievements of beneficiation of fluorite as well as breakthrough of beneficiation technology of niobium mineral.