Vacuum ceramic filter plates are an efficient solid-liquid separation technology and play an important role in tailings treatment. It achieves rapid dewatering of tailings through physical filtration, reducing the moisture content of tailings, thereby reducing the environmental risks of tailings ponds and promoting resource utilization. The following are its specific functions and advantages:
I. Working Principle of Vacuum Ceramic Filter Plates
Core material
The filter plate is made of porous ceramic materials (such as alumina, silicon carbide, etc.), with tiny pore diameters (usually 1 to 5 microns), high porosity and hydrophilicity, and can adsorb moisture through capillary action.
Work process
Filtration stage: The tailings slurry enters the filter. Under the action of vacuum negative pressure, the liquid (filtrate) is extracted through the ceramic micro-pores, and the solid particles are retained on the surface of the ceramic plate to form a filter cake.
Drying stage: Continue vacuuming to further reduce the moisture content of the filter cake.
Unloading stage: The filter cake is stripped off by mechanical scraper or reverse blowing gas, and can be directly transported or stored after collection.
Ii. Main Role in Tailings Treatment
1. Efficient dehydration to reduce the moisture content of tailings
The moisture content of tailings can be reduced from the conventional 30% to 40% to 15% to 25%, forming dry pile tailings (dry storage), significantly reducing the volume and weight of tailings.
Advantages:
Reduce the risk of tailings dam failure (due to low water content and high stability);
Reduce the generation of leachate and mitigate the risk of pollution to groundwater;
It is convenient for the transportation of tailings and subsequent resource utilization (such as brick-making, backfilling, etc.).
2. Reduce the spread of chemical pollution
Through efficient solid-liquid separation, harmful substances such as heavy metals and residual chemicals in tailings are retained in solid filter cakes, reducing the risk of dissolved pollutants migrating with wastewater.
Combined with wastewater treatment systems (such as neutralization and sedimentation), valuable components in the filtrate (such as metal ions) can be further recovered, reducing resource waste.
3. Energy-saving and environmentally friendly, with low operating costs
Low energy consumption: Compared with traditional filter presses, ceramic filter plates are driven by vacuum negative pressure, reducing energy consumption by 30% to 50%.
Long service life: Ceramic materials are corrosion-resistant and wear-resistant, with a service life of 5 to 10 years, reducing the frequency of filter cloth replacement and the generation of waste.
Water conservation: The filtrate can be recycled in the mineral processing process, reducing the consumption of fresh water.
4. Support the resource utilization of tailings
The dry tailings after dehydration can be directly used for:
Building materials: brick-making, cement admixtures, roadbed materials;
Backfill materials: Filling of mined-out areas in mines to reduce surface subsidence;
Recovery of valuable elements: Tailings with low moisture content are easier to extract residual metals through techniques such as roasting and leaching.
Iii. Comparison of Technical Advantages (with Traditional Filtration Technology)
| Index | vacuum ceramic filter plate | traditional plate and frame filter press |
| Moisture content | 5% - 25% | 25% - 35% |
| Energy consumption | Low (relying on vacuum pumps) | High (relying on high-pressure pumps) |
| Maintenance cost | low (long service life of ceramic plates) | High (frequent replacement of filter cloth) |
| Environmental friendliness | The cleanliness of the filtrate is high, the pollution risk is low | The quality of impurities in the filtrate is relatively high |
| Applicability | Suitable for fine-grained and viscous tailings | It has a better effect on coarse-grained tailings |
