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The Study of Nanolization of Slag
|關鍵字:||nano technique;奈米製程;physical grinding;planetary ball mill;High energy ball mill;物理粉碎法;行星式球磨;高能球磨||出版社:||材料工程學研究所||摘要:||
When slag adding inside of cement, it can be effectively to solidify the calcium hydroxide, which is easy to dissolve. Furthermore the pore of filled area can enhance the stability of volume and it can help the materials stay longer and stronger. Because the size of the powder of slag is micrometer, it is unable to efficiently fill under 10μm of capillary pore and under 0.1μm of colloid hole. That's why it is unable to improve the use of efficiency and functions of materials and it has to use the processing of nano technique to improve it.
This research selects physical grinding process to carry out the granulation of furnace slag. Two steps are involved in the grinding process: the first step is adopted planetary ball mill to make rough grinding to lower the size of initial slag to reach the micro scale. The second step is a refine process. High energy ball mill is carried out to decrease the size of slag to nano scale. Taguchi's method is applied to find out the optimized parameters of grinding of the planetary ball mill and the high energy mill at same time. It is expect to get nanometer scale powder of slag by combining the planetary ball mill with the high energy mill. Therefore, this study is focused on the discussion about the relation between grinding parameters and the resultant grinding properties of slag powder. After grinding, particle size measuring instrument is used to determine the slag powder size and x-ray is employed to examine the structure of slag. In order to observe the shape of slag powder, field-emission SEM is also used to examine the particle size distribution and the shape. EDS analysis is used to determine the slag composition.
Experimental results show that the size of particle reaches 1.5μm with a spherical shape. It indicates the particle size distribution reached the steady state after 5hr grinding of planetary ball mill and then refine process was carried out with the high energy mill. After 75 minutes wet grinding, the particle size decreased from 1.5μm to 93nm and changed from round to flat in shape. From the relation of particle size distribution and time indicates this step also reached the steady state. During planetary ball mill grinding process, Fe contained increased compared with initial slag composition by EDS analysis, but it was not observed in high energy mill grinding process. From x-ray result, the structure of slag has no variation after dry and wet grinding and only the alternation of particle size. Hence, it is the evidence that grinding did not cause the variation of structure of slag powder but decreased the particle size effectively.
|Appears in Collections:||材料科學與工程學系|
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