KR100554684B1 - Method for stabilization treatment of mining-tails and slag - Google Patents

Abstract

The present invention relates to a stabilization treatment method of tailings and slag that is a source of acidic water and harmful heavy metals, and to prevent the outflow of acidic water and heavy metals generated from tailings and slag, waste stone piles and the like contaminating the surrounding soil of the metal waste / waste mines. It is an object of the present invention to provide a stabilization treatment method of tailings and slag for preventing and ecologically stably treating tailings, slag, and waste-rock piles.

In order to achieve the above object, the present invention comprises a first step of grouting a heavy metal inert water-repellent mixed with a water-repellent agent in the bottom bottom layer of the waste-rock layer consisting of tailings and slag, and waste stone piles; A second step of introducing a heavy metal inert between the waste-rock layers; And a third step of forming a fill layer comprising a heavy metal inert agent, vegetation soil, and fine soil in the surface portion of the waste-rock layer.

Tailings, slag, waste-rock layer, heavy metal inert, coating layer, fill layer

Description

Method for stabilization treatment of mining-tails and slag}             

1 is a schematic diagram showing a stabilization treatment method of the tailings and slag according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: ground 20: waste-rock layer

30: permeable resistance barrier 40: order layer

50: coating layer 60: packing layer

70: groundwater

The present invention relates to a stabilization treatment method of tailings and slag as a source of acidic water and harmful heavy metals, and more specifically, acidic water generated from tailings and slag, waste stone piles and the like contaminating the surrounding soil of the metal waste and waste mines; The present invention relates to a method for stabilizing tailings and slag for preventing the outflow of heavy metals and ecologically stably treating tailings, slag, and waste-rock piles.

The tailings and slag are the residues from mines, the tailings are the ore powder left after grinding ore to almost the gold, and the slag is the metal separated from the smelting of the mineral.

In general, the waste-rocks such as tailings and slag are contaminated by heavy metals in summer due to heavy rainfall and pollute the surrounding rivers. In winter, the tailings particles are scattered and contaminate settlements and farmland around the mines. In addition, the soil around the mine will continue to receive pollutants, containing dozens or hundreds of times more heavy metals than uncontaminated soil. In particular, when the tailings and slag of metal mines contain sulfides, when the sulfide-containing waste rocks react with dissolved oxygen in the water, they generate strong acidic water to elute the heavy metals in the waste rocks, and are discharged into the leachate and the surrounding soil. And contaminate surface or ground water. Therefore, waste-rock, such as tailings and slag, is the most desirable method for preventing water pollution by blocking the contact with water at its source.

Typically, as a treatment method for tailings and slag, there are a landfill method, a solidification / insolubilization method, a landfill movement and a neutralization / stabilization / solidification method.

The reclamation method is a method of constructing and reclaiming a mine waste storage facility such as a retaining wall or a soil embankment in the area around the mine, and, if necessary, managing waste by adding various water repellents, covering soil, or planting. However, in the landfill method, there is always a problem that waste rocks such as tailings or slag are moved to soil, river water and groundwater during the rainy season, which threatens the ecosystem of the surrounding area of mines, and when landfilling a large amount of waste rocks is completed, And economic burdens such as incidental expenses such as treatment and transportation costs.

The solidification / insolubilization method is a method of chemically treating tailings or slag to non-migrate toxic harmful components present in waste-rock, and stabilizes harmful components and then builds tailings storage facilities as in the landfill method. It is one of the laws. However, the solidification / insolubilization method has a disadvantage in that a lot of construction costs.

The separate landfill movement plan is to move the mine waste itself to a nearby area or to move it to a specific waste landfill. Therefore, there is a limit to the application in the case of treating a large amount of waste, and further challenges remain due to the site use.

Neutralization / stabilization / solidification method is a method of blocking the outflow of the sulfide component in the waste-rock by filling the small pores by applying to the tailings and slag layer using a physicochemically modified acid neutralization and heavy metal treatment agent. Even if the waste-rock buried in the tailings field is in contact with the groundwater, it is already acid neutralized and heavy metal treatment agent to form a film on the surface of the blasting rock to prevent acid and heavy metals from leaking and it is environmentally harmless and construction cost is unnecessary since no subsequent process is required. Although it is inexpensive and can be reused as a road insecticide, it cannot guarantee the stable and continuous stabilization efficiency of the neutralizing / stabilizing treatment agent and is not developed for universal use. There is a problem.

Conventional tailings and slag treatment techniques as described above are only temporary measures to minimize the reaction rate, and are stored in a certain place until better inertness and recovery techniques are developed. There is a demand for a technology for improving the storage treatment to minimize environmental damage by deactivating tailings and slag in the long term.

Therefore, the present invention has been proposed to solve the above problems, environmentally harmless by stabilizing tailings, slag, waste stone, etc., which causes acidic water and harmful heavy metal spills using heavy metal inerts It is an object of the present invention to provide a stabilization treatment method for tailings and slag containing harmful heavy metal components which can be treated in an ecologically stable manner.

In order to achieve the above object, the present invention comprises a first step of grouting a heavy metal inert water-repellent mixed with a water-repellent agent in the bottom bottom layer of the waste-rock layer consisting of tailings and slag, and waste stone piles; A second step of introducing a heavy metal inert between the waste-rock layers; And a third step of forming a fill layer comprising a heavy metal inert agent, vegetation soil, and fine soil in the surface portion of the waste-rock layer.

The fill layer is a coating layer comprising a heavy metal inert agent and vegetation soil in the surface portion of the waste-rock layer; And a pavement layer including vegetated soil and high quality soil at the surface portion of the coating layer.

The heavy metal inert ordering agent is composed of at least one material of active red mud or fuxol.

It is preferable that the heavy metal inert ordering agent comprises a weight ratio of at least one selected from the group consisting of active red mud or fuxole and an additive ordering agent including bentonite in a range of 100 to 10 to 20.

The weight ratio between the waste-rock layer and the heavy metal inert agent introduced into the waste-rock layer in the second step is preferably 100 to 5 to 10.

It is preferable that the said coating layer consists of a ratio of a heavy metal inert agent and vegetation soil to one to one.

The fill layer is divided into two sections to vary the coating thickness, planting different trees to reinforce the planting. In other words, the thickness of the fill layer formed on the top of the waste-rock layer is 2m or less to close the shrub of 1m or less, and the thickness of the fill layer on the side of the waste-rock layer is about 3m or less to plant trees more than 1m. Do.

The above objects, features, and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying Figure 1 will be described in detail a preferred embodiment of the present invention.

1 is a schematic diagram showing a stabilization treatment method of the tailings and slag according to the present invention.

As shown in FIG. 1, the method for stabilizing tailings and slag according to the present invention primarily investigates the contact characteristics between the waste-rock layer 20 and the ground 10, which are made of tailings and slag, and waste-rock piles. 70) and whether it is related to As a result of the analysis, if the waste-rock layer 20 is likely to come into contact with the groundwater 70, that is, the waste-rock layer 20 is in contact with the groundwater 70, and the hazardous substance is caused by the groundwater 70. If there is a possibility that the groundwater 70 is contaminated by elution from), by analyzing the accumulated amount of the waste-rock layer 20 to determine the thickness and the amount of the heavy metal inert ordering agent of the bottom bottom layer of the waste-rock layer 20 Grouting (grouting) to seal the interface between the waste-rock layer 20 and the ground (10). That is, the order layer 40 is formed between the waste-rock layer 20 and the groundwater 70 flowing in the ground 10.

In addition, by maintaining a distance of a predetermined interval in the horizontal and vertical direction of the waste-rock layer 20 is added a heavy metal inert. The heavy metal deactivator serves as a Permeable Reactive Barrier (PRB) 30 formed at regular intervals in the waste-rock layer 20, and thus is environmentally harmless even if the treated water is dispersed and penetrated into the underground aquifer. The re-elution rate of harmful substances in the waste-rock layer 20 is extremely low. The permeable resistance barrier 30 is introduced at intervals of 1 m in the horizontal and vertical directions of the waste-rock layer 20.

The heavy metal inert is injected into the waste-rock layer 20 by a hole at a predetermined interval, that is, horizontal and vertical at regular intervals.

After the permeable resistance barrier 30 is formed, a coating layer 50 having a ratio of 5 to 5 of heavy metal inert agent and vegetation soil is applied to the surface of the waste-rock layer 20 to a thickness of about 15 cm, and the coating layer ( A pavement layer 60 made of mixed yarn, such as vegetated soil and fine soil, is applied to the surface portion of 50) to form a fill layer. The thickness of the fill layer formed on the top of the waste-rock layer 20 is 2 m or less, and the shrub is less than 1 m, and the thickness of the fill layer on the side of the waste-rock layer 20 is 3 m or less, and more than 1 m. Plant.

The heavy metal deactivator shown in Figure 1 is a strong alkaline by-product red mud (pH 11 to 12) generated in the process of producing aluminum hydroxide or alumina by baerite (bauxite) ore method as acidic water Either active red mud with washing to adjust the pH to 8-9 or commercially available heavy metal remover bauxsol can be used. In addition, a heavy metal inert ordering agent may be used by adding a ordering agent, such as bentonite, to any one selected from the above-mentioned active red mud and fuxole. The fuxol is a by-product generated from the aluminum hydroxide production process, a heavy metal remover subjected to physicochemical pretreatment, neutralizes acid with a basic concept of purification and release, and is a kind of on-site neutralization that prevents toxic heavy metal elements from adsorbing after being absorbed by the fuxol. environmental, permanent and permanent environmental pollutants such as acids, arsenic, cyanide, and toxic heavy metals in soil and water with nutralization, sabilization and solidification techniques It can be handled.

The mixing ratio of the heavy metal deactivator and the ordering agent used in the embodiment of the present invention shown in Figure 1 varies the mixing ratio according to the characteristics of the groundwater level. In the present embodiment, the mixing ratio of the heavy metal inert agent and the ordering agent may be 100 to 10 to 20 by weight ratio of active red mud or an additive ordering agent such as fuxol and bentonite. At this time, the addition ordering agent is added to increase the ordering ability of the active red mud or bovine sole, when 100 parts by weight of active red mud or fuxol, when the addition order exceeds 20 parts by weight heavy metal removal efficiency is lowered and 10 weight When the amount is less than parts, the ordering ability is reduced, so that when the active red mud or vaxole is 100 parts by weight, it is preferable that an additive ordering agent such as bentonite is mixed in a weight ratio of 10 to 20 parts by weight.

In particular, the preferred ratio of heavy metal inert agent introduced into the waste-rock layer 20 is in the range of 5 to 10 parts by weight of the heavy metal inert agent based on 100 parts by weight of the waste-rock layer 20. These input ratios take into consideration long-term safety, ecosystem stability, and economic feasibility. When the heavy metal inert is mixed at less than 5 parts by weight, the pH of the leachate is lowered and the heavy metal is eluted, and when the heavy metal inert is more than 10 parts by weight, the pH of the leachate is Are increasing, causing ecological problems and increasing purchasing costs, increasing the economic burden.

The inclined surface of the fill layer coated on the surface portion of the waste-rock layer 20 is divided into two sections to vary the coating thickness, and planting different trees to decorate the surrounding environment. That is, it can be divided into a fill layer applied to the upper and side portions of the waste-rock layer 20. The thickness of the fill layer formed on the top of the waste-rock layer 20 is 2m or less, and the shrub is less than 1m, and the thickness of the fill layer on the side of the waste-rock layer 20 is about 3m or more Planting The reason for smuggling the shrub is to prevent the soil layer from being washed in rain or water.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the field of the present invention that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

As described above, the method for stabilizing tailings and slag according to the present invention is environmentally harmless and ecological by stabilizing tailings, slag, waste stone, etc., which cause acid water and harmful heavy metal spills, using a heavy metal inert. As a result, it can be treated stably.

Claims (8)

A first step of grouting a heavy metal inert water repellant mixed with a water repellent agent on a lower bottom layer of a waste-rock layer made of a tailings, slag or waste-rock pile which is embedded; A second step of introducing a heavy metal inert agent into the waste-rock layer; And A third step of forming a fill layer including a heavy metal inert agent, vegetation soil, and good quality soil in the surface portion of the waste-rock layer; Stabilization treatment method of tailings and slag comprising a. The method of claim 1, The fill layer is A coating layer comprising a heavy metal inert agent and vegetation soil at a surface portion of the waste-rock layer; And A pavement layer comprising vegetated soil and good quality soil Process for stabilization of tailings and slag. The method of claim 1, The heavy metal inert ordering agent consists of at least one material of active red mud or box brush Process for stabilization of tailings and slag. The method according to claim 1 or 3, The heavy metal inert ordering agent The weight ratio of the added ordering agent comprising bentonite and at least one material selected from the active red mud or the boxsole is comprised of 100 to 10 to 20 Process for stabilization of tailings and slag. The method of claim 1, The weight ratio between the waste-rock layer and the heavy metal inert agent introduced into the waste-rock layer in the second step is 100 to 5 to 10 Process for stabilization of tailings and slag. The method of claim 2, The coating layer is a ratio of the heavy metal inert agent and vegetation soil 1 to 1 Process for stabilization of tailings and slag. delete The method according to claim 1 or 2, The thickness of the fill layer formed on the top of the waste-rock layer is 2 m or less, and the shrub is less than 1 m, and the thickness of the fill layer on the side of the waste-rock layer is 3 m or less to plant trees of 1 m or more. Process for stabilization of tailings and slag.

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