Disadvantages of Tailings Stockpiling
1). Since the tailings not only contain useful components such as re-separable metal ores and non-metal ores but also the non-re-separable tailings have many uses, so the storage of tailings will cause waste of useful components;
2). The storage of tailings not only occupies a large amount of cultivated land, but also easily causes environmental pollution, soil erosion, and vegetation damage in the mining area;
3). Tailings are easy to flow and collapse when they are stored, causing preparation damage and injury accidents. Especially in the rainy season, it is very easy to cause collapse and landslides. The tailings dam body is high, and there are hidden dangers of unsafety;
4). The composition of tailings and residual beneficiation agents seriously damages the ecological environment, especially the tailings containing heavy metals. The acid water produced by sulfide will further leach heavy metals, and the loss of heavy metals will cause harm to the entire ecological environment.
Gold Mine Tailing Treatment
Anti-seepage water material and anti-seepage mechanism of tailings dam
It can be seen that if the tailings dam does not carry out anti-seepage work, the harm to the environment is particularly great, but the actual situation shows that it is impossible to treat all tailings in a timely manner with other economic benefits. Water-permeable materials are very important.
1). Waterproof material for tailings dam
The performance of the composite geomembrane impermeable material made of plastic film as the impermeable base material and non-woven fabric mainly depends on the impermeability of the plastic film. Mainly divided into low-density polyethylene (LDPE) geomembrane, high-density polyethylene (HDPE) geomembrane, they are a kind of polymer chemical flexible material, with small specific gravity, strong extensibility, high adaptability to deformation, and corrosion resistance. , Low-temperature resistance, good frost resistance, and so on. For mining geomembrane, HDPE geomembrane is more resistant to corrosion and low temperature and is more suitable for use in tailings dam waterproofing materials.
2). Anti-seepage mechanism of composite geomembrane
The composite geomembrane is generally one cloth and one film or two cloths and one film. It is a composite material of plastic film and non-woven fabric. The main mechanism used in tailings dams as anti-seepage materials is to use the impermeability of plastic films to cut off earth dams. The leakage channel is subjected to water pressure and adapts to the deformation of the dam body with its large tensile strength and elongation.
Non-woven fabric is a kind of polymer short fiber chemical material. It is mainly formed by needle punching or thermal bonding. It has high tensile strength and elongation. After it is combined with plastic film, it can not only increase the tensile strength of the plastic film. and puncture resistance, and due to the rough surface of the non-woven fabric, the friction coefficient of the contact surface is increased, which is conducive to the stability of the composite geomembrane and the protective layer. At the same time, the two have good corrosion resistance to bacteria and chemical effects, are not afraid of acid, alkali, and salt erosion, and have a longer service life when used in the dark.
Gold Mine Tailing Treatment
Geomembranes have many applications within the mining industry, and include:
Ditch and canal liners
Heap leaching has become the preferred method of recovering minerals from low-grade ore from open-pit mines. Copper, gold, silver, and other metals are most common. The metal deposits are dissolved by chemicals applied to the top of the heap of ore, which eventually leaches to the bottom of the pile. Here a geomembrane liner captures the solution preventing it from migrating into the ground, before directing the solution by gravity to a collection system. The solution is sent to a refinery where the metal can be precipitated out and the solution sent back to the heap to be used again to dissolve more metal.
oil & gas are another ideal application for geomembrane liners. For more information call +86 189 6341 6260 today!