The shield muck dehydration has disadvantages such as
long processing time, low efficiency, and environmental pollution caused by
chemicals. Therefore, a novel material composed of liquid dimethyl ether and
triguaiacyl phosphite(DMETTFP) is developed to dehydrate
shield muck using phase change method, and the influence of different DMETTFP amount and reaction time on dehydration effect is examined. The
composition, particle size distribution, and morphology of shield muck before
and after dehydration are characterized by Xray
diffraction, Xray fluorescence spectroscopy, scanning
electron microscopy, and specific surface area analysis, respectively, and the
moisture morphological variations of the shield muck during dehydration process
is analyzed. The results demonstrate the following: (1) The amount of DMETTFP incorporation and treatment time considerably affect the
dehydration of shield muck. The moisture content decreases with increasing
amount of liquid DMETTFP incorporation and treatment
time. (2) The moisture content of the muck can be stabilized at approximately
23% when the mass ratio of liquid DMETTFP to moisture
in the muck is set at 8 with a dehydration time of 1520
min, resulting in an optimal dehydration state. (3) The particle size
distribution of the muck after dehydration is relatively constant, and DMETTFP cannot be found in muck, which exhibits favorable reusability
and weak contribution to the composition of the shield muck. (4) The free water
would preferentially be detached during early stage of dehydration, and almost
completely disengaged in the middle and later stages. Then partial bound water
could be gradually detached, and the removal efficiency of bound water attained
more than 35%.
ZHANG Qingyun, ZHAO Yang, ZHANG Di, CHEN Junwei, LU Jiayue, ZHANG Yingjie
.
Green and Efficient Dehydration of Shield Muck Using Liquid
Dimethyl Ether and Triguaiacyl Phosphite
[J]. Tunnel Construction, 2023
, 43(S2)
: 178
-185
.
DOI: 10.3973/j.issn.2096-4498.2023.S2.020
