The proportion of coking fly ash in mixed pulverized coal used in the production with rotary kiln of pellets could reach 15%, production with rotary kiln process is trouble-free and quality of pellets is stable by studying rotary kiln of pellets with coking fly ash. Moreover, the problem of environmental pollution caused by stockpiling of coking fly ash is solved, which provides a new way for effective treatment of coking fly ash. The fuel cost and production cost of pellets are effectively reduced by adding coking fly ash into mixed pulverized coal.

In the paper, it is introduced the operation systems of cloud computing platform of Baotou Steel increase continuously with the development of enterprise informatization so that the time of operation and maintenance and routing inspection is long as well as efficiency is low. The regular operation and maintenance and routing inspection of server of operation systems are realized so that their efficiency is improved, hidden troubles are found out and eliminated timely as well as stability of system operation is improved by compiling the Shell script.

In the article, the solution of unattended weighing system for automatically weighing materials transported by vehicles integrating the measurement and weighing, automation and computer technology is proposed. The system is with such functions as data acquisition, data sharing and remote transmission, voice command, vehicle localization, image capture and video monitoring so that the goal of unattended weighing and intelligent management of materials transported by vehicles is achieved. As a result, various problems such as high labor cost and labor intensity as well as falsification in traditional manual weighing mode are effectively solved.

The accuracy of coal sample analysis depends not only on analysis technology itself, but also on accurate preparation of coal sample before analysis. The coal sample preparation is a complex process including a series of links such as crushing, mixing, division and preservation. The optimization of this process plays a decisive role in improving and ensuring the accuracy of analysis results. In current coal sample preparation process, such factors as segregation of particle size, sample contamination, drying time and improper preservation conditions could affect the representativeness of sample and accuracy of analysis results. In this paper, the preparation method and process optimization of coal sample are discussed. The quality and efficiency of coal sample preparation are improved by optimizing such processes as crushing, mixing, division and preservation, which could lay the foundation for improving the accuracy of analysis result for coal sanple.

In China, the steel for steel structure is mainly plate and applications of hot rolled H beam (RH) in steel structure is growing slowly. The use level of RH accounts for only 15% of total amount of H beam, which is relatively lower and the rest is welded H beam (BH). In this article, the specifications, types, production processes, residual stresses, microstructure at R corner, advantages and disadvantages as well as future development trends of BH and RH are compared and analyzed. Moreover, several countermeasures for the application bottleneck of RH in construction steel structure are proposed.

The characteristics of continuous cooling transformation of fire-resistant test steel are analyzed as well as its microstructure at different cooling rates within 1~100 ℃/s are observed through drawing the continuous cooling transformation(CCT) curve of 345 MPa grade fire-resistant test steel. The results showed that there were ferritic and perlitic transformations of test steel when cooling rate was 1 ℃/s; there were ferritic and bainite transformations of test steel when cooling rate was 8~20 ℃/s, pearlite completely disappeared, grain size was reduced and proportion of bainite structure was increased; microstructure transformation of test steel was mainly bainite transformation, proportion of ferritic transformation was very low and grain size was further reduced when cooling rate was 50~100 ℃/s; ferrite disappeared completely, all the microstructure was changed to bainite and was with obvious tendency of lath when cooling rate was increased to 100 ℃/s. The analysis of CCT curve and microstructure for fire-resistant test steel provides theoretical basis for formulating cooling processes in the production process of 345 MPa grade fire-resistant test steel.

There is cracking failure at the weld seam of high strength and toughness 490CL wheel steel rim made with flash butt welding during flaring and forming process. Its causes are analyzed through macroscopic and microscopic observations of fracture morphology, tests of chemical compositions, mechanical properties, microstructure and microhardness as well as energy spectrum composition analysis. The results indicated that there were certain area of welding “gray spots” mainly composed of manganese oxide at weld failure so that the weld ductility was reduced. As a result, there is cracking at weld fusion line during flaring and forming process of welded rim. The weld quality of 490CL wheel steel for rim is improved by adjusting such welding parameters as reducing flash allowance and increasing pressure of upset forging so that the proportion of weld failure during forming of rim is reduced from 1.5% to 0.3%.

There are often such phenomena as spillage, firing, scratch of foreign objects and blockage as well as such failures as off tracking, slipping, scratch and tearing for conveyor belt of iron and steel enterprises. Moreover, the causes of various failures are analyzed, advantages and disadvantages of using various switches for belt failure detection are compared, a method of detecting various failures with images is proposed as well as adaptability of 2D and 3D image detection methods are compared. At last, the architecture of establishing intelligent belt detection platform for iron and steel enterprises is briefly described.

During the stamping process of components and parts of computer case, there is blackening phenomenon on the surface of galvanized fingerprint resistant plate of Baotou Steel so that the appearance quality after spraying by user is seriously affected. The microscopic morphology of galvanized plate after stamping is analyzed by microscope and scanning electron microscope (SEM) aiming at the defect. The results showed that the passivation film on the surface of galvanized plate of Baotou Steel dropped out during stamping process as well as the exposed Zn oxidized and turned black. It is effectively solved by adjusting film thickness and proportion of poly tetra fluoro ethylene in passivating liquid.

In order to eliminate the hidden dangers of rock falling and slope slide on slopes in Main Stope and East Stope of Bayan Obo Iron Mine as well as improve slope stability, the stability analysis of the slopes in Main Stope and East Stope of Bayan Obo Iron Mine is carried out. Such modes of slope treatment as full-length grouted bolt+shotcrete with wire mesh on slope surface+drainage opening, drainage with drainage opening and pre-stressed anchor cable+reinforced concrete retaining wall+rib column+drainage opening and pre-stressed anchor cable+half lattice girder+shotcrete with wire mesh+drainage opening are taken to reinforce the sectors with rock falling or slope slide in Main Stope and East Stope of Bayan Obo Iron Mine. Moreover, such slope monitoring systems as artificial monitoring, total station monitoring, slope radar, fracture meter and global navigation satellite systems (GNSS) receiver as well as corresponding safety management system are established to ensure the slope stability and safe productions of the mine.