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| A study in slump degree |
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Received:July 06, 2017
Revised:July 09, 2017
Accepted:July 10, 2017
Published Online:May 25, 2018
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| DOI： |
| KeyWord:unclassified tailings;fluidity;concentration of material pulp; slump degree |
| Author | Institution |
| yangning |
Changsha Institute of Mine Research Co.Ltd |
| yinxiangang |
Changsha Institute of Mine Research Co.Ltd |
| xiaomuen |
Changsha Institute of Mine Research Co.Ltd |
| zhongyong |
Luoyang Kunyu Mining Co.Ltd |
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| Abstract: |
| Afterwards backfilling mining method tends to become a widely used mining method worldwide in recently years. Inasmuch as the fluidity of the backfilling materials is of considerable importance to a backfilling procedure, taking a mine which uses backfilling mining method in its daily producing activity as an example in this article, the author conducts a experiment that is aiming at exploring the relationship between the ‘fluidity of the backfilling materials’ and the ‘slump degree as a result. Through analyzing a series of outcomes, it is found out that, with two factors varying, the density of the material pulp and the cement-sand ratio, the corresponding slump degrees, as a result, change. Also, when the concentration of the material pulp is controlled below 74%, the slump degree, according the result of the experiment, turns out to be 225 mm; in this case, the fluidity of the backfilling material is adequate to realize the pipeline gravity transportation. It is widely known that, lowering the concentration of the material pulp can better the fluidity, whereas the strength of the filling material body is reduced on the contrary. By observing the slumping and spreading pattern of the filling material of various cement-sand ratio and concentration, the 68% and above of material pulp shows an outstanding water-retaining property, as significant segregation of course and fine particles, excessive water-bleeding and other unwanted situation do not show up during the experiment process. Based on the result, when the material pulp concentration is limited in the range of 68% and 74%, the corresponding slumping degree is above 225 mm. |
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