Method for lixiviation of metals from ores in pit edges

FIELD: mining industry, in particular, technology for extracting mineral resource deposits, possible use for extracting ores of balance and over-balance resources during extraction of mineral resources.

SUBSTANCE: method includes preparing the massif, supplying reagents, draining solutions, sedimentation of useful components. Ore sections of useful components are detected in massif beyond limits of pit contour above the level of depression cone. These massif portions in pit sides are subjected to explosive crushing, well is drilled to upper area of each prepared ore section, and then lixiviation solutions with reagents are fed into the well. Solutions, self-flowing downwards along ore section, lixiviate metal and then enter common flow of underground waters, formed by depression cone. Sedimentation of metal is performed in the pit on geo-chemical barrier, in place of common exit of subterranean waters.

EFFECT: ensured fullness of extraction and high efficiency when completing a formation in accordance to open method.

3 cl, 2 dwg

 

The technical field to which the invention relates.

The invention relates to mining, in particular to the development of mineral deposits, and can be used when extracting ores balance sheet and off-balance-sheet reserves in the development of mineral resources.

The level of technology

Analogue of the invention is a method of leaching (Extraction of uranium ore by underground leaching". M., 1980), including the injection of leaching agents and pumping productive solutions through wells and precipitation of useful components from the pregnant solution by carrying out chemical reactions.

The disadvantages are the counterpart:

A. Lack of controllability of the process due to the use of the main direction of movement of groundwater as a transport solution in the ore zone;

B. the Possibility of loss of reagent due to leaks along with controlled flows of groundwater.

The prototype of the invention is a method of underground leaching of metals (Ahrens WE geotechnological methods of mining. M., "Nedra", 1975, s-179), including the crushing of the array, the supply of reagents with a controlled their movement through the array through the use of infiltration flow under gravity from the irrigation device to the drain and Sardinia useful components from the pregnant solution by carrying out chemical reactions.

The disadvantages of the prototype are:

A. the High cost of the process discharge leach reagent and pumping productive solution for creating a managed flow through the array.

The elimination of defects can be achieved through the use of natural hydrogeological resource, expressed aimed constant for groundwater in the composition of the depression cone.

The invention

The challenge aimed invention is to provide a method of leaching the metal from the ore in the pit, providing increased efficiency of field development due to the passing involving off-balance-sheet metal stocks in forests career by leaching with the use of natural resource directional flow of groundwater within the depression cones formed in prakaranam space array field development by the open method.

During implementation of the invention can be obtained from the following technical results:

A. improving the efficiency of field development.

These technical results are achieved due to the fact that the leaching of metals from ores in the pit includes the preparation of the array, the supply of reagents, pumping solutions, precipitation of useful components and different t is m, what reveal ore lots of useful components in the array outside of the pit above the level of depression cones, these sections array in the pit wall is subjected to explosive fragmentation, drill a well from the surface to the upper region of each of the prepared ore area, then into the borehole serves leachate solutions with reagents, which, flowing down the ore area by gravity, leached metal and then join the General groundwater flow, forming a cone of depression, the metal deposition is carried out in a career in geochemical barrier in place overall yield of groundwater.

Features, distinctive from the closest analogue, expressed by the following set of features: "identify ore lots of useful components in the array outside of the pit above the level of depression cones, these sections array in the pit wall is subjected to explosive fragmentation, drill a well from the surface to the upper region of each of the prepared ore area, then into the borehole serves leachate solutions with reagents, which, flowing down the ore area by gravity, leached metal and then join the General groundwater flow, forming a cone of depression, the metal deposition is carried out in a career in geo is imagescom barrier".

With the aim of combining in-time production carrying ore directly into a career with the leaching of metals from ores in forests career and enhance and speed the leaching explosive loosening in the area of ore concentration exercise for the whole pit in the period when the plane surface of the depression cone is above the ore zone, and the flow of reagents produced during the lowering of the bottom of the quarry, when the plane surface of the depression cone passes through the field of ore concentration, while geochemical barrier plating periodically move along with the water drainage as reduction of mining operations. Explosive rock breakage of the array is carried out until the future of the circuit Board career with the increase in the rate of leaching by increasing the permeability of rocks to the leaching process was completed by the time the plane surface of the depression cone falls below the level of occurrence of ore concentrations in the Board's career when lowering the bottom of the quarry. The loosened rock pit will help to redistribute the flow of groundwater in the array. Since the flow velocity of groundwater in the more porous the array above, you will increase the rate of leaching and the amount of water which will pass through razryhlenie the plot Board. Through this site will be the main volume of groundwater. Geochemical barrier, which produce metal plating, moving together with the pumping of groundwater (at the bottom) as the reduction of mining operations.

To reduce the costs of exploration zones of ore concentrations, explosive training array, drilling supply wells and injection of the reagents into the upper region of each of the ore feed concentration of reagents in the array is performed with the surface, the low depth of groundwater depression cone, using the topography of the surface. Supply of reagents produced in the places where the plane of the surface of the depression cone fits most closely to the land surface. In this version lixiviants in the composition of groundwater depression cone pass across the array, the surrounding mountain development (quarry), and carry out the leaching of metal with subsequent removal to geochemical barrier in the field of drainage in the career.

Thus, the objective of the invention is resolved.

List of figures

Figure 1 presents a section of the quarry with the marginal contour of the end of the mine; figure 2 presents a section of the quarry in the stage of intensive lowering of mining operations.

Information, confirming the possibility of carrying out what retene

In figure 1, figure 2 shows the incisions career in various stages of development, containing career space 1, pit 2, the reserves of 3, off-balance-sheet reserves 4, the surface of the depression cone 5, wells for reagent supply 6, and a geochemical barrier 7.

The implementation of the method is as follows. When traditional development open method form the career space 1, pit 2, from which is extracted reserves 3. Outside of the pit 2 in the array remain off-balance-sheet reserves 4, the recovery of which in the traditional development is not carried out. Mining works in the field of career space 1 is necessarily accompanied by the pumping of groundwater. The removal of groundwater from the career space 1 forms a depression funnel 5 in the array. Below the surface a depression cone 5 hydrogeological regime of the array is not disturbed. Higher levels of depression cones 5 breed array dehydrated to the limit of natural humidity. In the surface area of a depression cone 5 is the most intense for groundwater in the direction of the point of drainage, which is available in the career space 1. The dimensions of the depression cone 5 and the flow velocity of groundwater in the surface area depends on pronice the spine of the rock massif. In the development process at the quarry, close to the limit, identify ore areas off-balance-sheet reserves 4 in the array above the level of depression cones 5 outside of the pit 2. Parts of the array with off-balance-sheet reserves 4 is subjected to explosive fragmentation to increase the permeability of the rocks. To each of the prepared ore site off-balance-sheet reserves 4 drill a well to supply reagents 6. Well for reagent supply 6 serves the reagent solution in the upper area of the prepared site off-balance-sheet reserves 4. The reagent solution flows through the array of plot from top to bottom and videlicet metal and flows into the flow of underground ore in the area of the depression cone 5. Together with groundwater dissolved metal enters the career space 1 in the area of drainage. Before removing from the quarry groundwater drainage are like through the material of geochemical barrier 7. On the material of the geochemical barrier 7 metal precipitated.

Extraction of metal from ore off-balance-sheet reserves 4 located outside of the pit 2, and possibly at earlier stages of development of balance reserves of 3 fields, after the bottom of the quarry falls below the groundwater level, and water drainage will be formed in the array depression funnel 5. As demotion mining surface Dept is essional funnel 5 will go down, and surface area of the most intensive groundwater flow in the array will cover the lower area of concentration of ore off-balance-sheet reserves 4. The irrigation areas of the array leaching reagents can be carried out as previously described (through wells), and by filing solution in the areas of the relief surface directly in the upper horizons groundwater depression cone 5 in places the surface outcrop. Since the rate of reduction of mining operations is relatively low, it is possible to conduct the process of dissolution of metal reagents and explosive loosening of the array and without preliminary exploration to identify sections of the ore off-balance-sheet reserves 4.

When carrying out the invention will have the following technical results:

A. improving the efficiency of field development.

1. Method of leaching of metals from the ore in the pit, including the preparation of the array, the supply of reagents, pumping solutions, precipitation of useful components, characterized in that reveal ore lots of useful components in the array outside of the pit above the level of depression cones, these sections array in the pit wall is subjected to explosive fragmentation, drill a well from the surface to the upper region of each of podgotovki the spent ore area, then, in a well served leachate solutions with reagents, which, flowing down the ore area by gravity, leached metal and then join the General groundwater flow, forming a cone of depression, the metal deposition is carried out in a career in geochemical barrier in place overall yield of groundwater.

2. The method according to claim 1, characterized in that the explosive fragmentation in the area of ore concentration exercise for the whole pit in the period when the plane surface of the depression cone is above the ore zone, and the flow of reagents produced during the lowering of the bottom of the quarry, when the plane surface of the depression cone passes through the field of ore concentration, while geochemical barrier plating periodically move along with the water intake as reduction of mining operations.

3. The method according to claim 1 or 2, characterized in that the supply of reagents is carried out from the surface through the sump in places of least depth of groundwater depression cone.



 

Same patents:

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2 cl, 1 ex, 1 tbl, 4 dwg

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1 tbl

FIELD: technology for extracting product from well.

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2 dwg

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2 cl, 3 dwg

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3 cl, 2 dwg, 1 ex

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6 cl, 2 ex, 4 dwg

FIELD: mining industry, particularly for dissolving minerals other than hydrocarbons by an alkaline or acid leaching agent.

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EFFECT: possibility to create thawed working zone for following metal heap leaching in any season.

FIELD: mining industry.

SUBSTANCE: method includes prior pumping into bed through system of feed wells of solution, containing sodium hypochlorite or chloride, draining product solutions through draining wells system. Fed solution additionally has hydrogen chloride with following ratio of components, g/l: sodium hypochlorite 0.4-1.0, sodium chloride 3.0-4.0, hydrogen chloride 0.3-1.0. sodium hypochlorite solution is received directly at place of use via electrolysis of sodium chloride solution. For receiving sodium hypochlorite solution rotation compounds are used, received after productive solutions cycle through absorption columns.

EFFECT: higher safety.

3 cl

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