Overview of Dry Pile Tailings Filling Technology
Background and application of dry tailings filling technology
As a waste generated from mineral processing and mining, the treatment and utilization of tailings have always been an important issue in mining environmental protection and resource recovery. The dry pile tailings filling technology, as an environmentally friendly and economical solution, has been widely used in mining in recent years. By using tailings filling technology, not only can zero discharge of tailings waste be achieved, but also the mining area and surrounding environment can be effectively protected, the surface subsidence rate of goaf can be reduced, and the ore stepping rate can be increased.

Advantages of tailings filling technology
Environmental friendliness: By filling with tailings, the pollution of tailings to the environment can be reduced, and safety accidents such as tailings dam collapse can be avoided.
Economy: Tailings filling technology can effectively utilize mining waste and reduce ore mining costs.
Safety: Tailings filling can effectively prevent collapse of goaf and ensure the safety of mining operations.
Construction technology and process requirements for dry pile tailings filling
Preparation work before construction
Before filling the dry pile tailings, it is necessary to level the construction site, set out the hole positions, and install a drilling rig. Ensure the accuracy and quality of the construction process.

Construction process
Leveling the site and setting out the hole positions: ensuring the flatness of the construction site and the accuracy of the hole positions.
Installation of drilling rig and re measurement of hole coordinates: After installing the drilling rig, re measure the hole coordinates to ensure construction accuracy.
Drilling and coring of the lower inlet pipe: After drilling, coring drilling is carried out to ensure that the core recovery rate is greater than 70%.
Control drilling trajectory and inclination measurement: Control the verticality of drilling trajectory, conduct regular inclination measurement to ensure drilling accuracy.
Determine drilling indicators, expand holes, and insert outer casing: Determine drilling indicators according to design requirements, expand holes, and insert outer casing.
Cement cementing, perforation, and filling pipe insertion: After cement cementing, perform perforation treatment and finally insert the filling pipe.
Fixed sealing pipe mouth, completion and acceptance: After fixing the sealing pipe mouth, construction is completed and acceptance is carried out.
Key points of construction technology
Accuracy of drilling coordinates: Ensure the accuracy of drilling coordinates for subsequent construction.
Control of verticality of drilling trajectory: By selecting appropriate drilling tools and construction methods, control the verticality of drilling trajectory.
Selection of well casing: Choose appropriate filling pipes, wall protection pipes, and orifice pipes to ensure construction quality.
External cementing: High strength cement is used to fix the hole, ensuring the long-term use of the filled hole.
Comprehensive evaluation of dry tailings filling
The dry pile tailings filling technology has shown significant advantages in practical applications. Firstly, the full tailings filling technology can achieve the complete filling of tailings with fine particle size and severe mudification without grading, without the need for tailings storage facilities, thereby reducing environmental pollution. Secondly, dry tailings filling can effectively avoid the problem of insufficient sedimentation, reduce the cost of dam construction, and minimize environmental pollution. However, there are also some challenges in full tailings filling, such as uneven tailings feeding, which may affect the slurry concentration and ash sand ratio.

In summary, the dry pile tailings filling technology, as an environmentally friendly and economical mining method, has broad application prospects. By continuously optimizing construction techniques and process requirements, the effectiveness and quality of dry tailings filling can be effectively improved,