WO2013041036A1

WO2013041036A1 - New leaching-mining process by drilling underground in situ

Info

Publication number: WO2013041036A1
Application number: PCT/CN2012/081679
Authority: WO
Inventors: 秦勇; 丁浩; 熊惠
Original assignee: Qin Yong; Ding Hao; Xiong Hui
Priority date: 2011-09-22
Filing date: 2012-09-20
Publication date: 2013-03-28
Also published as: CN102418524A

Abstract

Disclosed is a leaching-mining process by drilling underground in situ. The process employs chemicals such as acids or bases to dissolve and leach useful metal constituents in the body of the mine, convert them from a solid state to a liquid state, and extract the metal constituents after recovery, by means of chemical reactions or physical reactions. With this mining process, no large-scale base construction underground or on the surface is needed, no environmental damage is caused to the surface of earth, and underground water is not polluted when effective containment conditions are employed, reducing the stages of digging and mineral dressing in traditional mining. The new oriented drilling process and fracture-acidizing technology can also mine hundreds of metres to thousands of metres of metal ore deposits which were previously difficult to mine, rapidly improving mining cycles and at the same time reducing mining costs to the maximum extent possible.

Description

A new underground in-situ drilling and leaching mining process

Technical field

The invention relates to a novel method for extracting a metal component by using a chemical agent such as an acid (alkali) to dissolve a useful metal component in a target ore body by a chemical reaction and a physical reaction, thereby converting it from a solid state to a liquid state. Mining method.

Background technique

Selecting the target ore body to understand the overall structure of the ore body by geophysical drilling technology, using directional drilling technology to seal the surrounding rock fault cracks of the ore body according to the structural conditions, and then designing the drilling plan according to the ore body shape, and transforming the deposit with large acid fracturing technology. The deposit is formed into a seepage channel inside the closed condition, and a chemical agent such as an acid (alkali) is injected into the injection well, and the ore is subjected to sufficient physical and chemical reaction, and then immersed and dissolved into a liquid, and is extracted to the ground through the production well to be electrolyzed or otherwise. The process plan recovers the useful metal components, and after the liquid is treated, the chemical is injected back into the underground ore body for recycling, and the mining is repeated in turn.

The method of underground in-situ drilling and leaching new mining technology, unlike traditional mining technology, does not pollute groundwater under effective sealing conditions, reduces the mining and mineral processing of traditional mining processes, and utilizes new directional drilling technology and fracturing acidizing technology. It can mine hundreds of meters to several kilometers of difficult-to-exploit metal deposits, quickly increase the mining cycle while minimizing mining costs.

Summary of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a method for underground in-situ drilling and leaching mining, in particular, a liquid mining method for metal deposits that are difficult to mine in the hundreds of meters to several kilometers underground. The method includes:

1. Develop a mining plan based on the survey results;

2. According to the construction situation, select an ore body with a certain scale and demarcate the mining block;

3. Perform directional drilling on the fault at the junction of the ore body and the surrounding rock in the designated block;

4. It is required to penetrate the target formation at the depth of drilling and complete the well after cementing with high strength cementing materials;

5. Inject high-strength plugging chemical additives into the directional wells of the previous completion to close the crack passages of the ore body and the surrounding rock faults, and make the target ore body in a relatively effective closed environment under the pressure balance of the surrounding rock layers.

6. Calculate the ore body metal reserves according to the metal content of the ore body, and formulate the mining well network distribution plan and drilling design plan.

The above-mentioned well pattern distribution scheme may adopt a parallel arrangement of well pattern distribution, and the amount of injected liquid and the amount of produced liquid remain at the same level;

All of the above injection and production wells use large acid fracturing techniques to modify the target formation.

Cracks along the plane of the formation are formed inside the ore body to form a seepage channel between the injection-production well network, that is, the injection well and the production well all form a connected state on the plane.

Underground in-situ drilling and leaching mining technology uses a new directional drilling process and fracturing acidification technology to mine metal deposits that are difficult to mine from a few hundred meters to several kilometers, using chemical agents such as acid (alkali) to dissolve by chemical reaction and physical reaction. The useful metal components in the leaching ore body have changed the large-scale infrastructure construction of traditional mining technology and reduced the mining and mineral processing in the mining process. The specific advantages are as follows:

1. This patented technology liquid mining does not require large-scale infrastructure construction in the underground or on the ground.

2. New directional liquid mining can be carried out on metal deposits that are difficult to mine in deeper (several hundred meters to several kilometers).

3. Reduce the mining, mineral processing and other aspects of the traditional mining process.

4. The invention evaluates the degree of recovery of the target ore body, the degree of recovery reaches the expected target and has no mining value, and the acid (alkali) residual night left in the pre-mining process of the ore body by injecting the alkali (acid) liquid into the ore body. The neutralization reaction is a salt substance, which restores the original physical properties of the ore body to the greatest extent and protects the environment from pollution as much as possible.

DRAWINGS

Figure 1 is a plan view showing the fracturing transformation of the present invention;

2 is a perspective view of a fracturing space of the present invention;

Figure 3 is a schematic view of the injection well of the present invention;

Figure 4 is a schematic view of the production well of the present invention;

Figure 5 is a schematic cross-sectional view showing the fracturing transformation of the present invention;

Figure 6 is a schematic view of a directional sealing fault fracture channel of the present invention;

Figure 7 is a plan view showing the flow of the production process of the present invention.

detailed description

Specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to Figure 1, the present invention employs a parallel arrangement of well patterns in which the injection well (1) is parallel to the production well (2).

Referring to Fig. 2, the present invention adopts a parallel arrangement of well pattern distribution, and the injection liquid (2) injection liquid volume and the production well (1) production liquid volume are maintained at the same level.

Referring to Figure 3, the present invention performs directional drilling on the target ore layer (3) according to the distribution of the well pattern, and inserts a corrosion-resistant casing (1) into the injection well, cementing with a high-strength cementing material, and then inserting a corrosion-resistant oil pipe (2) And the wellhead device is completed.

Referring to FIG. 4, the present invention performs directional drilling on the target ore layer (3) according to the distribution of the well pattern, and inserts a corrosion-resistant casing (1) into the production well, cementing with a high-strength cementing material, and then inserting a corrosion-resistant oil pipe (2) ) and completion of the wellhead device, and extraction of the sucking rod (4) and the pump (5) into the well.

Referring to Fig. 5, the present invention transforms the target formation by using the technique of large-scale acid fracturing equipment (1) for all injection wells and production wells, and injects acidified fracturing fracturing fluid and proppant (2) to form along the inside of the ore body. The cracks (3) in the plane of the stratum are formed to form a seepage channel between the injection-production wells, that is, the injection wells and the production wells all form a connected state on the plane.

Referring to Figure 6, in the mining block of the present invention, directional drilling (1) is performed on the fault (4) at the junction of the ore body (2) and the surrounding rock (3) in the block, and the drilling depth is required to penetrate the target formation. Completion after cementing with high strength cementing materials.

Referring to Fig. 7, the treatment process of the present invention comprises underground liquid production, recovery by a recovery device, separation of metal and waste residue by an electrolysis device, treatment of an acid (alkali) liquid, flow along a surface pipeline to an injection well for reinjection, recycling , repeated mining in turn.

Claims

1. A new underground in-situ drilling and leaching mining process characterized by:

(1) using a chemical agent such as an acid (alkali) to dissolve the useful metal component in the target ore body;

(2) By means of chemical reaction and physical reaction, the ore body is converted from a solid state to a liquid state, and the metal component is extracted after harvesting.
2. A method for a new underground in-situ borehole leaching mining process according to claim 1, wherein said target ore body utilizes geophysical drilling technology to understand the overall structure of the ore body, and utilizes directional drilling technology to block according to the structural condition. The surrounding rock fractures of the ore body are designed according to the shape of the ore body. The large-scale acid fracturing technology is used to transform the deposit, so that the deposit forms a seepage channel inside the closed condition, and the chemical is injected into the injection well. After the physicochemical reaction, the ore is immersed and dissolved into a liquid, and is extracted to the ground through the production well, and the useful metal components are recovered by electrolysis or other process schemes. After the liquid is treated, the chemical agent is reinjected into the underground ore body for recycling, in turn. Repeated mining.
3. A method for a new underground in-situ borehole leaching mining process according to claim 1 or 2, characterized in that the mineral deposit is modified by a large acid fracturing technique to form a seepage channel inside the deposit under closed conditions. The chemical agent injected into the injection well is a chemical agent such as an acid (alkali) and is sufficiently reacted with the ore.
4. A method of a subterranean in-situ borehole leaching mining process as claimed in claim 2, wherein the drilling depth is required to penetrate the target formation and to be completed after cementing with high strength cementing material.
5. A method for a new underground in-situ drilling and leaching mining process according to claim 2, wherein the developed mining well network distribution scheme adopts a parallel arrangement of well pattern distribution schemes, that is, injecting wells and mining on a plane. All the wells are connected to each other.
6. A method of a subterranean in-situ borehole leaching mining process according to claim 3 wherein said reaction is a chemical reaction and a physical reaction.