Study on the Factors Affecting the Performance of a Pressure Filtration–Flocculation–Solidification Combined Method for Mud Slurry Treatment
Abstract
:1. Introduction
2. Laboratory Pressure Filtration Model Test
2.1. Materials and Methods
2.2. Results of Pressure Filtration Model Test
2.2.1. Influence of Initial Mud Cake Thickness on the Pressure Filtration Effect
2.2.2. Influence of the Dewatering Time on the Pressure Filtration Effect
3. Introduction of One-Dimensional Large Strain Consolidation Theory
- The soil is homogeneous and completely saturated, the soil particles and pore water are incompressible, and the self-weight of the soil is considered;
- The seepage in the soil obeys Darcy’s law;
- Only the vertical deformation of water and soil particles is considered;
- The external load is applied instantaneously and held constant
- The thickness of the soil layer changes with the consolidation process
- The permeability coefficient and compressibility coefficient change nonlinearly
4. Calculation Model and Parameter Selection
4.1. Pressure Filtration Calculation Model
4.2. Calculation Parameter Values
4.3. Validation of the Computational Model
5. Influence of Pressure Filtration Parameters on Mud Cake Deformation
5.1. Effect of Initial Cake Thickness and Dewatering Time on Cake Deformation
5.2. The Effect of Filtration Pressure on Mud Cake Deformation and Dewatering Time
5.3. Optimization of the Pressure Filtration Parameters
- An increased initial cake thickness will lead to a non-linear increase in the dewatering time, resulting in a reduction in the processing efficiency; the initial cake thickness should be appropriately reduced.
- Under the same initial mud cake thickness, a continuous increase in filtration pressure after the pressure is increased to the critical value has less effect on the dewatering time.
6. Conclusions
- The mud cake thickness after pressure filtration obtained by the calculation model proposed in this paper combined with the one-dimensional large-strain consolidation theory is only slightly larger than the measured mud cake thickness, and the trend of the mud cake thickness against the dewatering time is basically the same. It is feasible to use the calculation model proposed in this paper to analyze the relationship between mud cake deformation and dewatering time.
- An increased initial cake thickness greatly affects the pressure filtration efficiency. In order to achieve the same dewatering effect, doubling the initial cake thickness will lead to an increase several times over in the dewatering time. Reducing the initial cake thickness within a certain range can improve the pressure filtration efficiency.
- An increased filtration pressure increases the final compression deformation of the mud cake. In order to treat the mud cake to the same water content, an increase in pressure when the filtration pressure is small effectively reduces the dewatering time, but a continuous increase in the filtration pressure after the pressure has been increased to the critical value had less effect on the dewatering time.
- Considering the processing efficiency and energy consumption, the initial mud cake thickness of 240 mm, filtration pressure of 1.0 MPa, and dewatering time of 30 min obtained from the calculation model in this paper are recommended for slurry treatment.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Specific Gravity Gs | Liquid Limit wL/% | Plastic Limit wp/% | Sand Content/% | Silt Content/% | Clay Content/% |
---|---|---|---|---|---|
2.70 | 53.7 | 26.5 | 14.9 | 79.5 | 5.6 |
Working Condition | Dewatering Time (min) | Mass of Dry Mud Slurry (kg) | Calculated Initial Thickness (mm) | Pressure Filtration Press (MPa) | Equivalent Initial Water Content |
---|---|---|---|---|---|
A1 | 10 | 3 | 102 | 0.3 | 250% |
A2 | 10 | 4 | 136 | ||
A3 | 10 | 5 | 170 | ||
B1 | 6 | 3 | 102 | ||
B2 | 8 | 3 | 102 | ||
B3 | 10 | 3 | 102 | ||
B4 | 12 | 3 | 102 |
Calculation Parameters | A1 | A2 | A3 |
---|---|---|---|
Initial thickness of mixed mud slurry, h01 (mm) | 102 | 136 | 170 |
Initial void ratio of mixed mud slurry, | 6.75 | 6.75 | 6.75 |
Initial mud cake thickness, h0 (mm) | 66.5 | 88.6 | 110.8 |
Initial void ratio of mud cake, | 4.05 | 4.05 | 4.05 |
Initial effective stress of mud cake, (KPa) | 1.0 | 1.0 | 1.0 |
Initial permeability coefficient of mud cake, (cm/s) | 1.82 × 10−2 | 1.82 × 10−2 | 1.82 × 10−2 |
Compression index, Cc | 1.2 | 1.2 | 1.2 |
Permeability index, Ck | 1.08 | 1.08 | 1.08 |
Initial Thickness (mm) | Filtration Pressure (MPa) | |||||
---|---|---|---|---|---|---|
0.4 | 0.6 | 0.8 | 1.0 | 1.2 | 1.4 | |
180 | 8.61 | 12.14 | 15.10 | 17.28 | 18.23 | 19.30 |
240 | 6.40 | 9.61 | 12.05 | 14.12 | 15.09 | 16.29 |
300 | - | 7.73 | 10.06 | 11.56 | 12.84 | 13.73 |
360 | - | 6.71 | 8.77 | 9.97 | 11.07 | 11.98 |
420 | - | 5.91 | 7.51 | 8.88 | 9.89 | 10.82 |
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Han, C.; Xie, H.; Bai, B.; Liu, D.; Huang, Y.; Zhang, R. Study on the Factors Affecting the Performance of a Pressure Filtration–Flocculation–Solidification Combined Method for Mud Slurry Treatment. Appl. Sci. 2023, 13, 11299. https://doi.org/10.3390/app132011299
Han C, Xie H, Bai B, Liu D, Huang Y, Zhang R. Study on the Factors Affecting the Performance of a Pressure Filtration–Flocculation–Solidification Combined Method for Mud Slurry Treatment. Applied Sciences. 2023; 13(20):11299. https://doi.org/10.3390/app132011299
Chicago/Turabian StyleHan, Chao, Hongping Xie, Bin Bai, Dongrui Liu, Yue Huang, and Rongjun Zhang. 2023. "Study on the Factors Affecting the Performance of a Pressure Filtration–Flocculation–Solidification Combined Method for Mud Slurry Treatment" Applied Sciences 13, no. 20: 11299. https://doi.org/10.3390/app132011299
APA StyleHan, C., Xie, H., Bai, B., Liu, D., Huang, Y., & Zhang, R. (2023). Study on the Factors Affecting the Performance of a Pressure Filtration–Flocculation–Solidification Combined Method for Mud Slurry Treatment. Applied Sciences, 13(20), 11299. https://doi.org/10.3390/app132011299