The backwater and surface water in the pump station for ponding of tailings pond were used for preparing flotation reagents for the primary flotation test. The test results showed that the backwater and surface water could be used for preparing the reverse floating collector of iron, collector of rare earth, mixed flotation collector and flotation reagents of fluorite instead of new water in productions and the effects of water quality on flotation index are not great so that the supplement of new water in productions and the production costs can be reduced.

The thermal properties of coke added different amount of ZnO and PbO are tested with the national standard method as well as the size and wall thickness distributions of pore of coke before and after test are tested, analyzed and compared. The experiments showed that the ZnO and PbO have positive catalysis on thermal properties of coke as well as they made the pore of coke greater and wall of pore of coke thinner in reaction so that the reactivity of coke is increased and the strength is decreased after reaction.

In order to understand the change rules for microstructure and properties of low alloy structural steel with controlled rolling and controlled cooling process, the Mn-B-Cr-Nb-Ti series of Q690 low alloy high strength structural steel was taken as the object of study, the change rules for structure properties with different processes are analyzed through changing the controlled rolling and controlled cooling process. The test results showed that the tensile strength, yield strength and yield ratio of the test steel were all decreased slowly, the elongation was increased and the impact energy at-20 ℃ was decreased periodically with the increase of finish cooling temperature. The microstructure was changed as the rules of ferrite, granular bainite and lath bainite as well as the effects on the properties of the material are different with the decrease of finish cooling temperature.

In the paper, the weldability of Q890D is studied with different welding experimental parameters. The reasonable welding and post-weld heat treatment processes are worked out through comparing the comprehensive mechanical properties and microscopic metallographic structure of welded joints so that their properties can meet the requirements of using product. Moreover, the deposition efficiency, formability of weld bead and change of spatter amount with different process parameters are studied, the sensitivity of welding cold cracks, mechanical properties of deposited metal for welding material and content of diffusible hydrogen for Q890D are tested.

In this paper, the microstructure and properties of high-strength steel for automobile frame BT610L hot rolled plate and hot rolled pickling plate are compared. The results showed that the grains were refined obviously, the microstructure was the dispersed distribution of a small amount of pearlite on fine ferrite matrix and the grain size was grade of 10.0, the yield strength and tensile strength were increased as well as the elongation was decreased after the pickling process; the impact tests were carried out at different temperatures, the impact toughness value of pickling plate was lower than that of hot rolled plate and their fracture morphologies were both dimple shape fracture.

In the paper, it is introduced an auto verification system for standard dynamometer is designed based on the virtual instrument technology and analyzed on the overall structure and measurement principles of the deadweight force standard machine. The modularization encapsulation of various tasks could be done by the system with its Labview development platform. Moreover, the loading/unloading weight of force standard machine as well as such functions as the collection, display, processing and management of the data tested could be realized so as to complete the automatic verification of the standard dynamometer and improve the work efficiency.

In this paper, it is introduced the technical index of NK electromagnetic ultrasonic flaw detector in 460 working zone of Steel Tube Co. of Baotou Steel, theoretical explanations of ultrasonic testing and working principles of electronic equipment for flaw detection, emphatically introduced the structure and parameter specification of electromagnetic acoustic transducer (EMAT) probe as well as the principle of waveform emission. The test results of longitudinal, transverse and delamination thickness measurement for steel tube with this equipment are stable through the actual flaw detection applications, which play a positive role in the quality control for steel tube products of the company.

In the paper, the vibrations of every measure point for generator set are analyzed with the spectral analysis and the related fault diagnosis theory through collecting the four channels time domain waveform aiming at the difficalt startup after the overhaul of TRT generator set of 5^# blast furnace in Iron-making Plant of Baotou Steel. It is found that the imbalance of couple causes the disorder of shafting so that the equipment is abnormal. The effects of imbalance of couple on shafting are effectively eliminated by introducing the online dynamic balance technology in the treatment of vibrations of generator on site.

In the paper, the harms and causes of the problem that the diesel is not unloading with the emergency braking of locomotive when the valve handle is moved to the position of emergency braking for GKD₂ and DF_7G diesel locomotives are analyzed as well as the corresponding improvement measures are established. The relevant electrical control circuit and corresponding parts are transformed so as to avoid the huge hidden dangers and harms caused by emergency braking of locomotive during normal operations while the diesel is not unloading.

In the paper, the design development and manufacturing of steel slag ladle for the mineral processing of 1.1 million tons of copper slag in Jinchuan Co. are introduced. According to the requirements of the technical agreement, the design requirements for loading the non-ferrous metallic slag are met through structural design, material selection, computer simulation and optimization of casting process plan so that the development and production of casting of cast steel slag ladle are guaranteed. As a result, the final product quality is stable and could meet the use requirements of customers.