Gold mine tailings treatment and comprehensive recovery method

With the continuous mining of gold mine resources and the advancement of beneficiation technology, the discharge of gold mine tailings is also increasing year by year, which inevitably brings a series of problems and further stimulates the development of gold mine tailings treatment and comprehensive utilization. . There are often problems in the discharge of gold mine tailings: long-term stacking takes up a lot of land, pollutes the environment, and wastes resources.

The treatment and comprehensive utilization of gold mine tailings are very important. At present, the common gold mine tailings treatment methods and comprehensive utilization mainly include the following methods:

1. Gold mine tailings re-election

The gold content in gold mine tailings is generally 0.2-0.6g/t. Due to the backward mining and dressing technology in the past, some gold and silver were lost in the tailings. At the same time, most of the gold ore was associated with copper, lead, zinc, iron, sulfur and other elements. With the advancement of ore dressing technology, gold In addition to reclaiming gold and silver, mine tailings re-election can also comprehensively recover valuable elements according to the properties of tailings. Therefore, tailings re-selection has become a major trend in the current gold ore tailings treatment.

Gold mine tailings flotation process

(1)Superfine particle flotation can be realized through pretreatment, adopting combined collectors, controlling slurry potential and pH and other measures.
(2)Slurry pretreatment technologies such as concentrated sulfuric acid strong oxidation and activated carbon adsorption can be used, and mixed flotation technology can be used in acidic medium to improve the comprehensive utilization rate of lead and zinc mineral resources in cyanide tailings.

2. Gold mine tailings dry discharge process dehydration

The tailings dry discharge process relieves the pressure of the tailings storage capacity, reduces the safety hazards of the tailings storage, and the use of backwater reduces the pressure of sewage treatment and saves the cost of mine production and operation. It is a requirement for the construction of national green and environmentally friendly mines.

For gold mine tailings after gold extraction by full-slime cyanidation, the tailings pressure filtration process of filter press can be used. As the filtrate is returned to the process, most of the cyanide ions, alkali and dissolved gold in the filtrate can be recovered, thus saving the consumption of mineral processing water, lime and cyanide, and reducing the discharge of cyanide-containing sewage.

3. Production of building materials

The recovery of valuable elements from tailings can only realize the comprehensive recovery of a small amount of valuable elements in tailings, but it cannot greatly reduce the amount of tailings, and still cannot fundamentally solve the problem of land occupation, damage and impact of tailings stockpiling. environmental problems.

4. Mine filling

As a good filling material, tailings can be obtained locally and used as waste, and the cost of collecting, crushing, and transporting crushed stones for filling materials can be exempted. For gold ore bodies with high value, the tailings can improve the mining conditions of the ore pillars and reduce the loss of dilution. Often, an appropriate amount of cement or other cementing materials are added to the filling material to condense the loose tailings into a whole with a certain strength.

The above are the common methods of gold mine tailings treatment and comprehensive utilization. In the actual application of the concentrator, it is recommended to comprehensively consider the nature of gold mine tailings, tailings scale, return on investment, etc. to determine the appropriate gold mine tailings treatment and comprehensive utilization methods, and tailor reasonable gold mine tailings treatment equipment .

Liming Heavy Industry - Classic Tailings Treatment Project

A 3000tpd gold tailing carbon slurry processing plant in the Philippines