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Jin H.-X.,Guizhou University | Jin H.-X.,Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving | Wu F.-Z.,Guizhou University | Wu F.-Z.,Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving | And 2 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2015

The flash pyrolysis experiments of coal, biomass and their mixture under the simulative conditions of coal topping process were carried out. The effects of pyrolysis temperature and samples on the yield of products, compositions of gas and net calorific value of gas were studied. The results showed that pyrolysis of the mixture of lignite and biomass obeyed the pyrolysis law of single substance, but the additive amount of biomass affected the yield of pyrolysis products. When the mass ratio of biomass to lignite was less than 1:1, the yield of gas increased from below 50% to above 60%, however, while the addictive amount of biomass increased to over 50%, the yield of gas decreased 5%. For the gaseous compositions of pyrolysis of lignite, biomass and their mixture, there were similar changing rules, CO2 was the main component, followed by CO, H2 and hydrocarbon gases. Among hydrocarbon gases, the content of CH4 and C3H6 was higher than that of C2H4, C2H6 and C3H8, and that of C4H8 the least. In addition, the content of CH4 in the gas from the mixture pyrolysis was 20% higher than that from lignite pyrolysis. Pyrolysis temperature had a significant effect on net calorific value of gas, which was increased at high temperature. Under the condition of 500~800℃ of pyrolysis temperature and mass ratio of biomass to lignite at 1:2, the net calorific value of gas increased from 11.38 to 16.10 MJ/m3. Therefore, high yield and calorific value of gas could be obtained for flash pyrolysis of the mixture of lignite and biomass in coal topping process. ©, 2015, Science Press. All right reserved. Source

Li C.-R.,Guizhou University | Li C.-R.,Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving | Zhang F.-S.,Guizhou University | Zhang Q.,Guizhou University | Zhang L.,Guizhou University
Journal of Iron and Steel Research | Year: 2016

The planar lattice disregistries between residual copper and substrate (compounds of Ti, Al2O3 or MnS) under the solidification temperature of steel were calculated and the validities of heterogeneous nucleation were analyzed. The results show that smaller disregistry between substrate and nucleation phase is more conducive to heterogeneous nucleation. The disregistry between copper and Ti2 O3, Al2 O3 or MnS is small and the two have a good matching relationship. They can be used as the particles of nucleation of copper and promote the heterogeneous nucleation of copper. Ti2O3 and MnS are the most effective cores for heterogeneous nucleation of residual copper, and Al2O3 is moderately effective, while TiC and TiN are not effective. Source

Chen C.,Guizhou University | Chen C.,Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving | Zhang M.,Guizhou University | Li J.,Guizhou University | And 2 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2015

The high content of red mud and fly ash glass ceramics was prepared by sintering process, using titanium slag to replace titanium dioxide as Nucleation Agent. The effect of titanium slag content on physicochemical properties, phase composition and microstructure of glass ceramics products were researched mainly. The results show that the main crystalline phase is gehlenite, and the secondary crystalline phase is hedenbergite and anorthite. The crystallinity increases with titanium slag content, but the titanium slag content is high, the crystal will occur condensation phenomenon. When titanium slag content is 6.6%, the compressive strength, flexural strength, microhardness, acid resistance, alkali resistance is 89.43, 53.13 MPa, 6.62 GPa, 0.041%, 0.15%, respectively. Product performance is meet standard of JC/T 872-2000 with building decoration glass-ceramics. ©, 2015, Journal of Functional Materials. All right reserved. Source

Wen W.,Guizhou University | Wen W.,Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving | Huang R.,Guizhou University | Huang R.,Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving | And 4 more authors.
Advances in Energy Science and Equipment Engineering - Proceedings of International Conference on Energy Equipment Science and Engineering, ICEESE 2015 | Year: 2015

An orthogonal test was carried out to investigate the effect of reduction temperature, reduction time, C/O mole ratio and basicity on the metallization ratio in the reduction of oolitic hematite. The results showed that: the impact of various factors of a primary and secondary order were reduction temperature, C/O mole ratio, basicity and reduction time. The influence of temperature was of significance. Metallization ratio increased with the increase of temperature and time. As the C/O mole ratio and basicity increased, metallization ratio increased first and then decreased. Metallization ratio of oolitic hematite can reach 90.83% under the optimal reaction conditions. © 2015 Taylor & Francis Group, London. Source

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