Chongqing Iron and Steel group Co.

Chongqing, China

Chongqing Iron and Steel group Co.

Chongqing, China
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Sun C.-Y.,University Of Science And Technology Liaoning | Liu X.-H.,Chongqing Iron and Steel Group Co. | Li J.,University Of Science And Technology Liaoning | Yin X.-T.,University Of Science And Technology Liaoning | And 2 more authors.
ISIJ International | Year: 2017

The viscosity of CaO-SiO2-MgO-Al2O3 slags (CaO/SiO2=1.0, 14-17 mass% Al2O3, 5-15 mass% MgO) was measured to analyze the effect of MgO and Al2O3. The infrared spectra was employed to analyze the ionic structure of the slag. The viscosity of CaO-SiO2-MgO-17% Al2O3 slags decreases with the increase of MgO content which is in the range of 5%-10 mass%. However, the dependence relationship is reversed when MgO content is over 10 mass%. The viscosity of CaO-SiO2-10 mass% MgO-Al2O3 slags and CaO-SiO2-11% MgO-Al2O3 slags exhibits the minimum value at 16 mass% Al2O3, which may contribute to the amphiprotic properties of Al2O3. The above phenomenon can also be verified by the infrared spectra. Simultaneously, in order to make the blast furnace working smoothly, the viscosity value of the slag is below 1.0 Pa·s commonly. Thus, we define the temperature of the slag with a viscosity value of 1.0 Pa·s as "Critical Temperature (CT)". And, the effect of MgO and Al2O3 content on CT is also studied by the phase diagram. We can conclude that the fall of the CT can be owe to the simplified network structure at the MgO content from 5 mass% to 10 mass%, while the rise may be because of the appearance of solid phase at the MgO content from 10 mass% to 15 mass%. © 2017 ISIJ.


Huang L.Q.,Chongqing Iron and Steel group Co.
Advanced Materials Research | Year: 2014

To solve the problem of alumina dissolution in perforated anode technology, dissolution behavior of alumina has been studied in the laboratory by simulating electrolyte parameters of the factory which has adopted the technology. The results show that alumina saturated solubility is 3.991% for CR(2.4)-Caf2 (5%)Lif(3%)-MgF2 (0.5%) system at 940°C. The relationship between dissolution rate and concentration of alumina does not have regular change when alumina concentration is less than about 1%. When the concentration is greater than about 1%, the dissolution rate declines with the increasing concentration of alumina. Combined with the production, the suggestions which can improve energy-saving effect are proposed as follows: the particle size and the concentration of alumina in the electrolyte should be controlled in the range of 44μm to 100μm and 1.5% to 3% respectively; the time interval of point loading and the alumina supply every time can be cut down properly and alumina can be preheated. © (2014) Trans Tech Publications, Switzerland.


Huang L.Q.,Chongqing Iron and Steel group Co.
Advanced Materials Research | Year: 2014

Taking the waste heat utilization of sintering circular cooler in Chongqing Iron & Steel Co.,Ltd as an example, the problems of the system have been analyzed and some measures have been presented based on the theory of total energy system in this paper. The result shows the main reasons that the generated energy can only reach the design value of 60% are lower energy grade because of oversintering or undersintering of sinter, the air leakage of waste gas recovery system of sintering circular cooler, frequent short interruption of sinter flow and so on. Some measures which can improve the energy grade of waste heat of sintering circular cooler and increase the generating capacity have been proposed. These measures involve controlling the end point of sintering, improving the operation level of main process, improving sealing technology of the system, recycling the heat of the boiler outlet flue gas, cascading utilization of the heat of third section of the sintering circular cooler, valuing the conversion and utilization between the various forms of energy, such as work, heat, the internal energy of working medium. © (2014) Trans Tech Publications, Switzerland.


Liu S.,Kunming University of Science and Technology | Tong X.,Kunming University of Science and Technology | Yang J.,Chongqing Iron and Steel Group Co. | You J.,Chongqing Iron and Steel Group Co.
Advanced Materials Research | Year: 2012

Large amount of surrounding rocks in Jianshui China has been discarded for many years, and the "rock" is characterized by Cu-Fe poly-metallic constituents and of low grade. A joint process of flotation and magnetic separation was proposed to process the ore. This paper introduces the test results of flotation tailings by a wet drum separator. Results show that iron concentrate assaying 60.21-68.12% Fe at a recovery of 71.9-75.32% can be obtained, when the flotation tailings assays 33.91%Fe. At the same time, a joint process has put forward to make full utilize the "rock". © (2012) Trans Tech Publications, Switzerland.


Liu S.,Kunming University of Science and Technology | Wang W.,Kunming University of Science and Technology | Yang J.,Chongqing Iron and Steel Group Co. | You J.,Chongqing Iron and Steel Group Co.
Advanced Materials Research | Year: 2012

Beneficiation of a low-grade titanomagnetite ore containing 18.52%Fe and 6.65%TiO2 was conducted by dry and wet low intensity magnetic separators. Effects of different variables, such as magnetic intensity, grinding fineness and stages of separation, were investigated in details. The ore was firstly preconcentrated by a dry low-intensity magnetic separator (DLMS) at a magnetic intensity of 2500Oe, and then ground to -0.074mm 53%, followed by a wet low-intensity magnetic separator (WLMS) to recover iron minerals. An iron concentrate assaying 49.22% Fe can be obtained at a recovery of 46.23%. The concentrate was further ground to -0.074mm 70%, followed by two stages of WLMS, and a marketable iron concentrate assaying 56.24% Fe and 9.44% TiO2 can be obtained at the recovery of 42.89% and 20.69%, separately. Tailings assaying 6.48% TiO2 with a recovery of 79.31% is subject to be further recovered. © (2012) Trans Tech Publications, Switzerland.


Guo D.-Y.,Chongqing Iron and Steel Group Co. | Zhang J.,Chongqing University | Lu D.-C.,Chongqing Iron and Steel Group Co. | Bai C.-G.,Chongqing University | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2014

More and more Australian iron ore had been consumed in Chongqing Iron and Steel Group Co., Ltd. in recent years and consequently the slag property had been changed, especially the increased value of Al2O3 in slag has defect on slag fluidity. The viscosity in CaO-SiO2-Al2O3-MgO-TiO2 slag that add chemical agents to industrial slags has been measured at different R and the mass percent of Al2O3, MgO, TiO2 were fixed at 12%, 8%, 5% respectively. In addition the slags viscosity at different cotent of TiO2 has been measured. The results show that moderate content of TiO2 can reduce viscosity, and viscosity decreasing with basicity increasing at current scope, the viscosity decreasing trend flattens when basicity exceed 1.35.


Qiu Y.,Guizhou University | Sun L.,Chongqing Iron and Steel Group Company | Zhang Q.,Guizhou University | Liu Z.,Guizhou University
XXV International Mineral Processing Congress 2010, IMPC 2010 | Year: 2010

As important coal resources, medium- high sulfur accounts for a signifi cant part of the coal reserve in China. The environmental regulations and fuel standard requires sulfur and ash to be removed before it is used, so as to save energy and decrease the emission. Therefore, the effective desulfurisation and deashing technologies are urgent needed. However, due to the local characteristics of the coal, specifi c technology with optimum operation parameters is required to develop for different local coal. Qinglong is a district of Guizhou Province, which has large medium to high sulfur contained coal reserve. In this paper, medium-high sulfur coal is sampled from Qinglong, Guizhou province. Some basic characteristics such as the mineralogical composition of the coal rock, the monomer existing state and the granulometric composition are determined by X-ray diffraction quantitative analysis and polarisation microscope analysis respectively. Adopting the classifi ed feed method, shaking table tests show that the feed pulp concentration is 20 per cent, the stroke is 13mm, the frequency of the stroke is 380 per min, the cross slope is 3° and the volume of wash water is 5.2 L per min. Under such condition, aggregate processed coal yield is 72.87 per cent and sulfur content decrease to 1.31 per cent With shaking table technology of 'First stage rough and intermediate further fi ne benefi cation', the yield of concentrate coal increased from 72.87 per cent to 81.21 per cent, while the sulfur content reduced to 1.35 per cent.


Lu Y.J.,Chongqing University | Wang Q.,Chongqing University | Li Y.G.,Chongqing University | He S.P.,Chongqing University | And 4 more authors.
Ironmaking and Steelmaking | Year: 2011

Transverse corner cracks were observed frequently in Nb containing steel slabs produced by a vertical bending type slab caster. The hot ductility of the steel was measured with a hot tensile test, and the result indicated that the temperature at the slab corner fell into the embrittlement temperature range which resulted in the cracking problem. To ensure that the temperature of the slab was uniformly above the embrittlement temperature range during the straightening process, asymmetric secondary cooling nozzles have been implemented on the caster. After this modification, the temperature of the slab corner during the unbending operation was increased to above the embrittlement temperature range of the Nb bearing steel, and the incidence of transverse corner cracks was greatly reduced. © 2011 Institute of Materials, Minerals and Mining.

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