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| Influences of acidity coefficient on physical and chemical properties of slag wool |
| LONG Yue1,2，DU Pei-pei1,2，LI Zhi-hui1,2,3，ZHANG Liang-jin1,2，ZHANG Yu-zhu1,2 |
（1. School of Metallurgy and Energy，North China University of Science and Technology，Tangshan 063009，Hebei，China
2. Modern Metallurgical Technique Key Laboratory of Ministry of Education，North China University of Science and Technology，Tangshan 063009，Hebei，China
3. School of Metallurgy，Northeastern University，Shenyang 110819，Liaoning，China） |
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Abstract In order to determine the optimum acidity coefficient of modifying blast furnace slag in slag wool production process. Using four-roll centrifugation method，slag wool with different acidity coefficients was prepared under the laboratory condition，and the influences of acidity coefficient on the physical and chemical properties of slag cotton was studied by testing the physical and chemical performances of mineral wool. The results show that the diameter of slag wool increased exponentially with the increase of acidity coefficient，the mineral wool mainly consisted with vitreous body structure. With the increase of acidity coefficient，the crystallization temperature decreased，and the temperature needed to form fiber became wide. Under the condition of weak acid，the microstructure on the surface of slag wool with different acidity coefficients had no obvious change，and the surface was still relatively smooth. Under the alkaline conditions，corrosion phenomenon appeared on the surface which was more rough，accompanying by the generation of newborn hydration phase. It is better to maintain the blast furnace slag acidity coefficient between 1.0-1.4 during the production of slag wool.
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Received: 27 July 2015
Published: 26 April 2016
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2016, Vol. 51 
