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Rizhao, China

Xu H.-C.,Control Iron and Steel Research Institute, China | Zhou H.-M.,Control Iron and Steel Research Institute, China | Qi Y.-H.,Control Iron and Steel Research Institute, China | Xie G.-H.,Rizhao Steel Co.
Kang T'ieh/Iron and Steel | Year: 2012

Dust and sludge containing Zn can not be effectively recovered and reused in the process of ironmaking and steelmaking, which leads to serious resource wastage and environmental pollution. The rotary hearth furnace (RHF) process is proved to be successful for dealing with dust and sludge containing Zn and Pb in American and Japan. RHF process with capacity of 2 × 200 kt/a was introduced in Rizhao iron and steel Corporation. Its characteristics were as follows, taking cold bonded pellet containing carbon as the material of RHF, coal gas from twin zone gas furnace as heat source of RHF, air and gas preheated for reusing RHF gas waste heat and the metallized pellets used for coolant in converter process. Through trial production for several months, the Rizhao RHF process is successful commercials. Its production practice shows that RHF can effective recovery valuable metal from dust and sludge of steel plant, metallized pellets can keep original shape, good strength, and about 80% of percent metallization. The successful RHF process would promote the development of RHF in China.

An X.,Northeastern University China | Xing Z.,Northeastern University China | Xing Z.,Rizhao Steel Co. | Jia C.,University of Science and Technology Beijing
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2014

Physical experiments were carried out to study the cold compaction of copper powders under uniaxial compression using our self-designed equipment. Two kinds of copper powders with different particle sizes and distributions were considered. One-dimensional vibrations were utilized before compaction to systematically study the effect of parameters such as vibration frequency ω, amplitude A, and vibration intensity Cyrillic capital letter GHE on the initial packing density. The macro-property and corresponding microstructures of compacts obtained from initial packings with and without vibrations were compared and analyzed. The results show that higher packing density can be obtained in the compaction of coarse powders with broad size distribution when other experimental conditions are fixed. For each powder, the evolution of packing density vs pressure takes on exponential correlation with high R 2 value. Much denser and more uniform compacts can be realized with the aid of vibration which can improve the particle rearrangement and result in the filling of macro pores formed in initial packing, and the characterization on the microstructure identifies that the particles inside the compact become polyhedrons with regular shape and uniformly distributed. © 2013 The Minerals, Metals & Materials Society and ASM International.

Gao L.,Rizhao Steel Co.
Yejin Fenxi/Metallurgical Analysis | Year: 2013

The sample was dissolved with nitric acid and hydrofluoric acid at low temperature. After perchloric acid was added for fuming, the salts were dissolved with hydrochloric acid. Then, the content of sulfur in fluorite was determined by inductively coupled plasma atomic emission spectrometry. The matrix effect, interference and correction among coexisting elements were investigated. The results showed that, the matrix calcium fluoride and coexisting elements (such as Al, Fe, Ba, Mn and P) had no influence on the determination. Under the selected conditions, the content of sulfur in the range of 0.001%-6.5% showed good linearity to the emission intensity with correlation coefficient higher than 0.9990. The proposed method was applied to the determination of certified reference materials YSB14794-02 and actual sample of fluorite. The results were consistent with the certified values or those obtained by combustion iodometry. The relative standard deviation (RSD, n=11) was not more than 1.5%, and the recoveries were between 96% and 104%.

Kan X.-L.,Rizhao Steel Co. | Fan L.-X.,Rizhao Steel Co.
Kang T'ieh/Iron and Steel | Year: 2012

The gas in burner and the fume in hearth was pumped and discharged after the valve for the furnace reversed. In this situation, the higher content of CO in the flue gas and the higher temperature in heat accumulator could lead to the burning melt, cracked and life-span shortened. Secondary combustion technology with PLC reversing apparatus can partly pump the flue gas, which can be used to flush the gas in burner into the furnace re-combustion before it is discharged. The technology's advantages are as follows. The combustion ratio over 90%, and heat efficiency of heating-furnace over 71%; extend the life of heat accumulator from 10months to 18mouths. Recover the CO of fume and reduce emissions of CO nearly 10 × 10 7 m 3 per year to achieve environmental control.

The determination method of nine elements (silicon, calcium, magnesium, aluminium, manganese, titanium, chromium, nickel and cobalt) in laterite nickel ore by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. The laterite nickel ore sample was fused by anhydrous Na2CO3-H3BO3 mixed flux, then acidified and leached by hydrochloric acid. The high salt atomizer and cyclone chamber were used. Under the selected measurement conditions, the content of nine elements in sample solution was determined by ICP-AES. The influence of salts introduced by matrix iron and sample treatment could be eliminated by matrix matching method. The precision test results showed that, the relative standard deviations (RSD) of elements were smaller than 5%. The proposed method was applied to the determination of reference material, and the determination results of nine elements were basically consistent with the certified values.

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