Tower crane is the mechanical equipment playing a leading role in the construction of high rise buildings as well as it is widely used because it could achieve any work height and work range through installing and attaching. Its installation and disassembly are more dangerous projects, so construction organizations should pay high attention to the safety technology management of installing and disassembling tower crane. In the paper, it is introduced the construction process of demolition with tower crane, mainly discussed the problems need to be solved in the process as well as elaborated the construction preparation, order of demolition with tower crane, safety precautions and reinforcement measures of truck crane at different positions of roof for underground garage in detail, which could be as the reference for construction of demolition with tower crane.

The process technology of “oxidation+chemical precipitation+coagulating sedimentation and heavy metal collector” is proposed through studying the treatment technology of thallium-containing desulfurization waste water as well as the optimal proportion meeting the requirements of removing thallium is determined by adjusting the concentration (set value) of oxidant (sodium hypochlorite), pH, polyaluminum chloride (PAC), heavy metal collector and polyacrylamide (PAM). The experimental results showed that the removal efficiency of thallium was 99.75% when the concentrations of oxidant (sodium hypochlorite), PAC, heavy metal collector and PAM were 1 500 mg/L, 200 mg/L, 1 300 mg/L, 4 mg/L respectively and pH value was 10, which could meet the requirements of discharge standard for thallium in desulfurization waste water.

In this paper, the cognition for ore genesis of iron, rare earth and niobium of Bayan Obo is put forward with comprehensive geological research means through surface geological survey, geostatistics, element spatial concentration regularity as well as researches of the latest deep drilling data and fluid inclusions. It is considered that the iron, rare earth and niobium ores are the genesis of igneous carbonate magma accompanied by multi-period hydrothermal metasomatism in later period, which provide important basis for Bayan Obo to establish the prospecting model, conduct metallogenic prediction and evaluation as well as accurately search for resource target regions.

After years of operation, there are such problems for the crushing system in submontane dressing area of Baoshan Mining Co. as large number of equipment, low technical level and high maintenance costs. The factors affecting crushing operation indexes are found out through investigating and analyzing the current situation of existing crushing technology. The existing crushing circuit is transformed, the original crushing circuit is changed from “one closed circuit each three sections” to “one closed circuit each two sections”, add HP800 fine crusher to realize the matching running of two types of crushers and carry out the size optimization of sieve plate. The particle size of entering grinder is greatly reduced after the transformation, which creates favorable conditions for subsequent grinding and separation operations, the number of equipment as well as workload of equipment maintenance and inspection are reduced so that the comprehensive benefit of RMB 8.54 million yuan per year can be created.

Under the circumstances of environmental protection, production limitation and tension supply of agglomerate, it is becoming a new trend in the development of furnace burden structure for iron making to use large proportion of pellet in 2 200 m³ blast furnace of Baotou Steel. The blast furnace condition maintains stable and trouble-free, application of large proportion of pellets in 2 200 m³ blast furnace of Baotou Steel is successfully realized and the proportion of pellet is up to 50% through adjusting and controlling the bandwidth for matrix of burden distribution, amount of central coke, sequence of material discharge at output section, diameter and length of the tuyere, heat reserve of hearth, basicity of slag as well as actively responding to the changes of furnace condition for operations after the proportion of pellet increases.

The armco iron requires the manganese content in steel to be controlled within 0.005%. In order to study the smelting process for low manganese steel, the thermodynamic and dynamic conditions of demanganization reaction are analyzed. The study showed that the lower the temperature of liquid steel was, the higher the oxidizability of slag and oxygen content in steel were as well as the lower the manganese oxide content in slag was, the easier the oxidation reaction of manganese was. When the manganese content in liquid iron is 0.040%~0.055%, the end point carbon content of liquid steel in converter after bessemerizing is controlled at 0.025%~0.035% and final temperature is controlled below 1 620 ℃ so that residual manganese content in liquid steel could be reduced to 0.04%~0.08%. The demanganization rate of liquid steel increases with the quantity of converter slag increases. Without the deoxidation during tapping of converter, the liquid steel and slag in ladle would maintain higher oxidizability. During the refining process in ladle furnace(LF), the manganese content in steel could be reduced by 32% on average and decreasing amplitude is 0.01~0.04 percentage points. The manganese content in steel could be reduced steadily within 0.05% with the combined demanganization processes of converter and LF.

In this paper, the influences of equipment failure for rolling mill on product quality and improvement measures are discussed by analyzing the relative movement of roll collar for KOCKS rolling mill and flange plate, detection and classification of movement through CAPAS system as well as vibration detection rules of transmission shaft for C module. The results showed that the bending of bars above Φ19 mm was caused by the deterioration of working condition for rolling mill as well as the wave bending of finished product could be effectively improved through maintaining the shaft sleeve and flange plate of rolling mill; the bending of bars below Φ19 mm was caused by the vibration of rolling mill as well as the wave bending of finished product could be obviously improved through repairing the movement and drive system of rolling mill. The axial drifting of roller is determined by strength of rolling bearing of drive shaft so that the vibration of rolling mill is affected. As a result, the wave bending of finished products could be obviously improved through using high quality rolling bearing.

In order to improve the charge discharge efficiency of nickel metal hydride (Ni-MH) battery at high temperature and meet the requirements of service environment, the charge and discharge performance of Ni-MH battery at high temperature are tested by adding NaOH into the conventional electrolyte. The experiment of comparing the charge discharge efficiency of Ni-MH battery added NaOH electrolyte with that of conventional Ni-MH battery is carried out at the environment temperatures of 55 ℃ and 65 ℃ separately. The results showed that the charge and discharge performance of Ni-MH battery added NaOH electrolyte was obviously higher than that of conventional Ni-MH battery in high temperature environment. The charge discharge efficiency is about 3 percentage points higher than that of conventional battery in high temperature environment of 55 ℃ and it is about 17~20 percentage points higher than that of conventional battery in high temperature environment of 65 ℃.

In this paper, the chemical composition and annealing process of galvanizing process for hot-dip galvanized fingerprint resistant sheet DCJD2+Z for household appliances are designed. The effects of different annealing temperatures on the metallographic structure and mechanical properties of steel strip DCJD2+Z are studied with such analysis methods as optical microscope and universal tensile testing machine as well as the process of DCJD2+Z products is determined combining with the using status of users. When the galvannealing temperature is 810~840 ℃ and elongation of temper mill is 0.6%~1.2%, the mechanical properties and formability are good to meet user requirements.

In this paper, the cold rolling process of high magnetic induction oriented silicon steel 27QG090 is explored and studied with the cold rolling testing system of pilot scale test platform as well as the microstructure and macroscopic XRD texture of samples after cold rolling in laboratory are analyzed with the Zeiss microscope and X-ray diffractometer. The study results showed that its microstructure after cold rolling with different reduction ratios was fibrous that elongates along the rolling direction and shear bands in the uneven deformation zone could be observed. Its texture after cold rolling in laboratory was mainly the α texture and a little {001}<110> rotated cubic texture as well as cold rolling specifications preferred 0.27 mm and 0.23 mm. The macro texture of cold rolled sheet for industrial trial production consists of α texture and a small amount of rotated cubic textures, which mainly concentrates in {114}<110> and {115}<110> textures so that the microstructure and texture are consistent with those of cold rolling in laboratory.