In this paper, it is introduced the current situation of the weighing equipment and printing system of scutcheon in the three work zones of Long Product Plant as well as the effective design scheme is put forward based on it. The system development is completed as well as the tripartite communication among the ERP system, weighing system and printing system of scutcheon is realized through software programming technology so that the desired effects of the software are achieved.

In the paper, it is introduced such difficulties as the poor thermal property of coke, high content of the harmful element in the furnace, poor air permeability of stock column and difficult adjustment of initial air flow distribution are overcome by such measures as adjusting the blowing-in system and charging system under the condition of the two 4 150 m³ blast furnaces of Baotou Steel with economic furnace burden so that the problems of bending and damage of tuyere are solved as well as the period of trouble-free operation for blast furnace is prolonged.

In the paper, it is elaborated the gas seepage model of goaf was established with the technical conditions for actual mining of fully mechanized top-coal caving face of a mine as well as the widths of oxidized zone of goaf with different horizontal distances and vertical distances of high drainage tunnel were analyzed with the Fluent numerical simulation software combining with the actual layout requirements of high drainage tunnel aiming at the autoignition of goaf caused by gas extraction in high drainage tunnel. The results showed that when the vertical distance of high drainage tunnel was 35 m and its horizontal distance was 25 m, the width of the oxidized zone of goaf was the smallest. The determination for reasonable position of high drainage tunnel is with the practical guiding significances in improving the gas extraction efficiency, reducing danger of autoignition of coal and ensuring green, safe and efficient fully mechanized top-coal caving face.

The causes for such rolling instabilities of medium and high grade non-oriented silicon steel in the hot continuous rolling process as poor strip shape, drift and scrap steel are analyzed. Starting from the influence mechanisms of stable rolling, the quick open control strategy of reheating furnace is developed by analyzing such five influencing factors as the rolling phase change zone, temperature difference of the same plate by slab reheating, strip shape of rough rolling, deformation resistance and finishing rolling speed models; the rolling phase change point is calculated and the pass distribution of rough rolling is optimized; the stability of medium and high grade non-oriented silicon steel in rolling process is improved by considering the influences of all elements on deformation resistance model of finish rolling and changing the control mode of finish rolling speed.

In the paper, the optimum test conditions are obtained through studying the determination for content of carbon and sulfur in all kinds of ferroalloy with high-frequency induction combustion-infrared method as well as emphatically discussing the effects of selecting such parameters as the compensation and comparison level, the shortest parsing time, amount of fluxing agent and weighing sample on the determination results. The results showed that the method was suitable for determining the content of carbon and sulfur in ferroalloy, the detection limits for carbon and sulfur were 0. 000 3% and 0. 000 2% respectively as well as their relative standard deviations were both less than 3% through determining the samples of ferromanganese and ferromolybdenum 11 times. The estimated values for all kinds of ferroalloy standard samples determined with this method were the same as their certified values.

In the paper, the operable technical scheme is analyzed, summarized and concluded through field practices based on some accident cases of hot rolling strapping machine so that the maintenance personnel in the same industry can use for reference as well as quickly and accurately determine the causes of failures and take effective measures.

There are adverse effects of residual Ti on the final magnetic property of silicon steel, so the Ti content should be strictly controlled to be as low as possible when smelting silicon steel. In the paper, the sources and increment for the content of harmful element Ti are analyzed based on the data of Ti content after adding the ferrosilicon and ferro-aluminium into 60 heats of silicon steel with different thicknesses of slag layer. With the increase of silicon steel grade, the Si contentin in siliconstal is increased and the quantity of the ferrosilicon added is also increased so that the Ti content rises correspondingly; it is crucial for controlling the end-point Ti content of molten steel to reduce the thickness of slag layer simultaneously.

The fracture, inclusions and morphology of cracked BT510L were analyzed with the scanning electron microscope and metalloscope aiming at the cracking in cold bending of BT510L steel for a car factory supplied by Rare Earth Steel Plate Plant. Meanwhile, the influences of impurities such as P and S in the batch of steel were invesgated. The results showed that the inclusion of manganese sulfide at the fracture of crack was the main cause. The content of sulfur in molten steel is reduced and such defects are avoided by optimizing the control technology in refining process.

The excavating in the east stope of Bayan Obo Iron Mine has been started since 1958, the belt conveyer system of rock has been put into production since June of 2007 and the maximum capacity of rock dumping is up to 6.25 million t/a until now. With the continuous stretching downward of the stope, the east stope is gradually entering into the period of natural production reduction and the annual amount of stripping rocks of stope is gradually reduced. In 2016, the planned amount of stripping rocks was 4 million t and 3.92 million t of them were transported with the belt conveyer system. The actual production capacity of belt conveyer system is much larger than the annual planned amount of rock dumping and tends to be larger and larger year by year. After analysis and overall consideration, the mode of production organization of east stope is changed and the production technology is optimized. Part of ore is transported to the ore platform of dump with the surplus production capacity of belt conveyer system, then the ore is transported again to the reshipment platform to reduce the transportation costs and improve the utilization rate of belt conveyer system so that the target of reducing costs and increasing benefits is achieved, which is with greater reference significance for management of similar mines.

The NO_X in sintering process is mainly from the fuel burning. In this paper, the effects of different amount of urea, CaO and starch as additive to pretreat coke powder for sintering on emission of NO_X in sintering process and the indexes of sinter were studied by sinter pot test. The results showed that when the amount of additive is 0%~1.0%, the more the urea is added, the more obvious the effect of reducing emission of NO_X is, the effect of changing the amount of added CaO on inhibiting generation of NO_X is not great, the emission of NO_X is more by adding starch and the effect of adding amount on the increment is not great as well as the effect of amount of additive on changing the sintering indexes in this range is not great.