The intellectual features of beneficiation equipment become increasingly prominent and efficient upgrading of intelligent beneficiation equipment technology is one of the effective ways to improve beneficiation efficiency. In this paper, it is systematically introduced the development process of photoelectric intelligent sorting technology in the field of beneficiation and its application progress in multi ore sorting. Moreover, it is introduced and analyzed the working principles and technical performances of XRT intelligent sorting machine. Finally, it is introduced the experimental study of pre-separation for iron bearing rock of an iron ore with photoelectric intelligent sorter. The results showed that the rough concentrate with the iron grade of 25.13% and recovery rate of iron of 67.98% could be obtained by discarding the tailings with the iron grade of 9.53% and productive rate of 55.39% under the condition of the raw ore with the particle size of 10~100 mm and iron grade of 16.49% so that the expected indicators could be achieved, which provides scie.pngic basis for the resource utilization of iron bearing rock and the further popularization and applications of the equipment.

In the article, the influences of changes of vanadium (V) content on microstructure and properties of high carbon steel are studied. The high carbon test steels with different technologies and V contents are tested and analyzed with the tensile test and hardness test as well as observation with metalloscope and scanning electron microscope. The results showed that there were influences of changes of V content on mechanical properties of high carbon steel. All the strength, hardness and ductility of high carbon steel could be slightly decreased with lower V content under conventional process conditions. Moreover, there are influences of heat treatment process on high carbon steel with different V contents. The ductility of low V test steel is better than that of high V test steel as well as the changes of strength and hardness for test steel are smaller through reasonably optimizing heat treatment process. Furthermore, it is found in the study that the influences of moderately reducing V content on microstructure of high carbon steel are smaller so that the changes of mechanical properties associated with microstructure are not obvious.

In order to relieve the environmental pressure caused by a large amount of waste in the process of smelting rare earth, the experimental study on beneficiation of high grade rare earth ore concentrate of Bayan Obo is carried out. The sodium silicate is as inhibitor, reagent of hydroximic acid is as collecting agent and 2^# oil is as foaming agent as well as the closed circuit experiment process of “one time of rougher flotation and four times of concentrations” is adopted in the flotation test of rare earth. As a result, the rare earth ore concentrate with grade of 62.79% and recovery rate of 84.73% is obtained, which lays a good foundation of raw material for subsequent clean productions.

In the paper, it is introduced the studies on fixed flash welding process of 380HB grade high strength heat treated rare earth rail and normalizing process of joints are carried out with the common fixed flash welder and heat treatment equipment for normalizing of joints at home and abroad. The optimal welding process and heat treatment process of joints are summarized through comparing and analyzing the qualified rate of drop weight tear test, area of grey-spots and Rockwell hardness of longitudinal section for joints with different processes. For the joints of fixed flash welding for obtained 380HB grade high strength heat treated rare earth rail, the mean values of tensile strength R_m, elongation after fracture A and impact energy at room temperature KU₂ are 1 141 MPa, 12.5% and 16.0 J respectively, hardness ratios of joints H_J/H_P is 0.92, H_J1/H_P is 0.84 as well as width of softened zone for joints W≤15 mm so that the mechanical properties and microstructure of joints could all meet the standard requirements. As a result, the problems of lower hardness and drop hammer fracture of flash joint for high strength heat treated rail are solved so that the excellent performance matching of welded joints and rail could be achieved, which could meet the requirements of wear resistance and compliance for heavy-haul railway to joints of high strength heat treated rail.

In the process of flattening and straightening, the iron oxide scale of beam steel is broken, dropped out and pressed into surface of steel coils so that pockmarks of different sizes are formed on surface, which seriously affects the appearance quality of products. In this paper, the relatedness between such process parameters as the inlet temperature of finishing rolling, rolling speed, cooling rate and coiling temperature as well as thickness and structure of iron oxide scale is researched. The results showed that the thickness of iron oxide scale was increased with the increase of inlet temperature of finishing rolling when it was below 980 ℃; the faster the rolling speed, the thinner the iron oxide scale on surface of strip steel. The defect of pockmarks on surface of beam steel is effectively controlled by optimizing the heating schedule, increasing rolling speed as well as optimizing laminar cooling rate and coiling temperature.

The warping on surface of hot rolled plate and strip is always the common defect that troubles production of high quality strip. The causes for warping defect on surface of steel could be throughout the whole process of steel production such as smelting, continuous casting, hot rolling and cold rolling. The types of warping defect are various and influencing factors are complex. The causes of common warping defect are classified into 5 types based on their morphology and microstructure characteristics, which are subsurface inclusions, surface cracks, subsurface bubbles, rolled-in scale and edgefold of intermediate billet. The probability of occurrence of warping defect for products could be reduced significantly by enhancing management of production equipment and process interfaces, especially increasing the level of continuous casting process from the origin to improve surface quality of ingot blank.

As an important manufacturing process of oriented silicon steel, the normalizing process has a key effect on magnetic properties of high magnetic induction oriented silicon steel. In the paper, the effects of holding time and cooling rate for normalizing on microstructure and texture of high magnetic induction oriented silicon steel are studied with optical microscope and X-ray diffractometer. The microstructure and texture of normalizing plate are similar to those of hot rolled plate as well as microstructure is with nonuniformity in the direction of plate thickness. The main types of texture are Goss texture {110}<001>, copper type texture {112}<111> and brass type texture {110}<112>. With the extension of holding time, grains recrystallize completely and texture types are changed significantly; with the increase of cooling rate, there are not significant changes for microstructure and texture types as well as strength of Goss texture is increased.

In the paper, the technical progress of ironmaking system of Baotou Steel is summarized and analyzed. It is thought that the technological breakthrough and innovation of beneficiation, sintering and smelting problems for special iron ore of Bayan Obo are fundamental guarantee for achieving the ironmaking production with high efficiency and quality, low consumption, long service life and environmental protection as well as technical support of great-leap-forward development for ironmaking of Baotou Steel.

In the paper, it is introduced current treatment processes and utilization ways of coking high salinity wastewater as well as analyzed the restraining factors and solutions for technologies of salt separation and crystallization in treatment of coking wastewater. The treatment scheme of deep oxidation, salt separation and crystallization for coking high salinity wastewater is adopted by a coke making enterprise based on the existing biochemical treatment, deep treatment and membrane concentration treatment to further remove such pollutants as organic matters, ammonia nitrogen and fluoride in coking high salinity wastewater so that wastewater recycling is realized. Moreover, the recycling and zero discharge of coking wastewater are realized through producing such two high quality by products of crystal salt as sodium chloride and sodium sulfate by evaporation crystallization.

In this article, it is firstly introduced the current situations of pipeline for hydrogen transport and hydrogen mixing pipeline for natural gas at home and abroad as well as representative domestic project program of pipeline for hydrogen transport such as the hydrogen transport engineering of “west to east hydrogen transmission” led by Sinopec. Secondly, the relevant international standards for construction as well as operation and maintenance management of pipeline for hydrogen transport are briefly introduced. Finally, the development opportunities of hydrogen resistant pipeline steel are introduced from four aspects, which mainly include optimizing alloy composition as well as smelting, rolling and heat treatment processes of steel for storage and transportation pipeline and container; regulating and controlling size, morphology, type and distribution of inclusions in steel as well as controlling banded structure and harmful oxide; evaluating and optimizing mechanical properties of welding materials, welds with welding process and heat affected zone in hydrogen environment, improving welding process of steel for storage and transportation pipeline, storage containers and pipeline as well as studying the effect laws of alloy compositions of base metal, compositions of welding materials and welding processes on hydrogen embrittlement of weld heat-affected zone; establishing requirement specifications for pipeline materials and products including hydrogen compatibility of base metal of pipeline and welded joints.