Construction method for improving powder ore recovery rate of downward mining entry

Abstract

The present application relates to a kind of construction methods for improving the recovery rate of downward mining drift powder ore, belong to the field of downward slice drift filling mining method in metal mine, the present application includes mine waste demarcation, powder ore laying and powder waste rock laying, mine waste demarcation is divided in upper slice room, for determining the offset area of lower slice room relative to upper slice room, powder ore laying is in the overlapping area of upper slice room and lower slice room, powder waste rock laying is in the offset area of upper slice room.The powder waste rock in the offset area of the present application can buffer the blast shock wave of lower slice room, and also can be used as a substitute material for powder ore, thereby solving the problem of serious powder loss in the near lower disc side room in the traditional false roof manufacturing process, and has good practicality and economy in the production practice of downward slice drift filling mining method in mine.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of downward slicing drift filling mining method of metal mines, in particular, relates to a construction method for improving the recovery rate of powder ore in downward recovery drift. BACKGROUND

[0002] Filling mining method plays an important role in the construction of green mines in China. It can reduce ore loss and dilution, control stope ground pressure and prevent surface damage, and has good applicability in complex broken and variable ore bodies. With the gradual deepening of ore body mining, under the action of high ground stress, the ore rock becomes more broken, which makes the application proportion of downward slicing drift filling mining method gradually rise. This method recovers the ore body from top to bottom, and the lower slicing room is safely mined under the protection of the upper slicing false bottom. At the same time, in order to prevent the explosion shock wave generated by the recovery of the lower slicing room from damaging the upper slicing false bottom, a certain thickness (about 20 cm) of powder ore is usually laid as a buffer layer in the room before the upper slicing room false bottom is made. This buffer layer can be recovered synchronously with the recovery process of the lower slicing room. However, due to the influence of the ore body dip angle, there is a certain offset distance between the upper and lower slicing rooms on the near lower wall side in the horizontal direction, which causes the loss of powder ore in the offset distance. The more gentle the ore body dip angle, the greater the offset distance between the corresponding rooms of the upper and lower slicing rooms, and the higher the powder ore loss rate. Therefore, a construction method for improving the recovery rate of powder ore in downward recovery drift is proposed, which uses the lower slicing room lower wall boundary as the upper slicing room waste rock boundary, and replaces the ore with part of waste rock before the upper slicing room false bottom is made, thereby improving the recovery rate of powder ore in downward recovery drift and reducing the production cost of the mine. This method has certain practical significance for improving the economic efficiency of downward slicing drift filling mining method. SUMMARY

[0003] In order to overcome the problems in the background art, the present application provides a construction method for improving the recovery rate of powder ore in downward recovery drift, which sets a buffer layer for replacing powder ore and playing a blasting buffer role, thereby reducing ore loss.

[0004] To achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0005] The construction method for improving the recovery rate of powder ore in downward recovery drift comprises the following steps:

[0006] S1, demarcate the ore-waste boundary 5: use the lower wall rock boundary of the lower slicing room 2 as the ore-waste boundary 5 of the upper slicing room 1 to divide the offset area 4 of the upper slicing room 1 relative to the lower slicing room 2.

[0007] S2, powder ore 6 laying: the powder ore 6 is laid in the overlapping area of the upper slicing room 1 and the lower slicing room 2.

[0008] S3, powder waste rock 7 laying: powder waste rock 7 is laid in the offset area 4 of the upper sublevel ore room 1, for replacing the powder ore 6 in the original offset area 4, the powder waste rock 7 in the offset area 4 can buffer the influence of the blasting shock wave of the lower sublevel ore room 2 on the upper sublevel ore room 1, and meanwhile, the loss of the powder ore 6 in the offset area 4 can be avoided, thereby improving the powder ore recovery rate of the downward mining roadway.

[0009] As preferred, the step S1 mine waste boundary 5 is demarcated in the upper sublevel ore room 1, and coincides with the lower sublevel ore room 2 lower disc boundary, and the lower sublevel ore room 2 lower disc boundary is determined according to the lower disc side 3 boundary line exposed by the mining preparation engineering.

[0010] As preferred, the step S2 and step S3 powder ore 6 and powder waste rock 7 are laid before the false bottom of the upper sublevel ore room 1 is made.

[0011] As preferred, the step S2 and step S3 powder ore 6 and powder waste rock 7 need to ensure that the site in the upper sublevel ore room 1 and the lower sublevel ore room 2 is leveled before being laid, without obvious pits and protrusions.

[0012] As preferred, the step S2 and step S3 powder ore 6 and powder waste rock 7 are laid with a thickness of 20 cm.

[0013] As preferred, the step S2 and step S3 powder ore 6 and powder waste rock 7 are dry and without large pieces mixed in, and after the laying is completed, the powder ore 6 and the powder waste rock 7 should be kept at the same level, so as to ensure the flatness of the bottom of the false bottom of the upper sublevel ore room 1 on the lower disc side.

[0014] The beneficial effects of the present application are as follows:

[0015] 1. The present application measures and demarcates the mine waste boundary, replaces the powder ore with powder waste rock in the offset area of the upper sublevel ore room relative to the lower sublevel ore room, which can buffer the influence of the blasting shock wave of the lower sublevel ore room on the false bottom of the upper sublevel ore room, and meanwhile, the loss of the powder ore in the offset area can be avoided. The method has been successfully applied to the production site, and good economic benefits have been achieved, which can provide certain reference for the powder ore recovery of the downward sublevel roadway filling mining method of the complex and variable metal ore body. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a sublevel ore room structure schematic diagram of the present application;

[0017] In the figure, 1 is an upper sublevel ore room, 2 is a lower sublevel ore room, 3 is a lower disc side exposed by a mining preparation engineering, 4 is an offset area, 5 is a mine waste boundary, 6 is a powder ore, and 7 is a powder waste rock. DETAILED DESCRIPTION

[0018] In order to make the purposes, technical solutions and beneficial effects of the present application clearer, the preferred embodiments of the present application will be described in detail below with reference to the drawings, so as to facilitate the understanding of the skilled in the art.

[0019] As Figure 1 shown, the construction method for improving the powder ore recovery rate of the downward mining gateway comprises the following steps:

[0020] S1, demarcating the ore-waste boundary line 5: taking the lower compartment ore rock boundary line of the lower layer mine house 2 as the ore-waste boundary line 5 of the upper layer mine house 1, which is used to divide the offset area 4 of the upper layer mine house 1 relative to the lower layer mine house 2.

[0021] S2, powder ore 6 laying: the powder ore 6 is laid in the overlapping area of the upper layer mine house 1 and the lower layer mine house 2.

[0022] S3, powder waste rock 7 laying: the powder waste rock 7 is laid in the offset area 4 of the upper layer mine house 1, which is used to replace the powder ore 6 in the original offset area 4. The powder waste rock 7 in the offset area 4 can buffer the impact of the blasting shock wave of the lower layer mine house 2 on the upper layer mine house 1, and at the same time can avoid the loss of the powder ore 6 in the offset area 4, thereby improving the powder ore recovery rate of the downward mining gateway.

[0023] Wherein, the ore-waste boundary line 5 is demarcated in the upper layer mine house 1 and coincides with the lower compartment boundary line of the lower layer mine house 2. The lower compartment boundary line of the lower layer mine house 2 is determined according to the boundary line of the lower compartment side 3 exposed by the preparation engineering. The lower compartment ore rock boundary line of the lower layer mine house 2 is taken as the ore-waste boundary line 5 of the upper layer mine house 1.

[0024] The laying of the powder ore and the powder waste rock is carried out before the false floor of the upper layer mine house is made. Before the powder ore and the powder waste rock are laid, the powder ore, the loose ore and the bulk ore (waste rock) in the upper layer mine house must be completely cleaned, and the site must be ensured to be flat without obvious pits and protrusions. At the same time, the ore-waste boundary line is marked on the floor of the mine house. When the powder ore and the powder waste rock are laid, the laying materials should be dry and without large blocks mixed. The laying thickness is 20 cm. After the laying is completed, the powder ore and the powder waste rock should be kept at the same level, so as to ensure the flatness of the bottom of the upper layer false floor.

[0025] The laying of the powder waste rock is mainly used to replace the powder ore in the original offset area. The powder waste rock in the offset area can buffer the impact of the blasting shock wave of the lower layer mine house on the upper layer mine house, and at the same time can avoid the loss of the powder ore in the offset area 4, thereby improving the powder ore recovery rate of the downward mining gateway.

[0026] Application example:

[0027] When downward slicing drift stoping is carried out in a metal mine, the lower slicing room lower boundary line is determined according to the boundary line of the lower side exposed by the mining and preparation engineering, and the lower slicing room ore rock boundary line is used as the upper slicing room ore waste boundary line; before the upper slicing room false bottom is made, it is determined that the powder ore, scattered ore and large block ore (waste rock) in the upper slicing room must be completely cleaned, and the site is ensured to be flat, without obvious pits and protrusions, it is determined that the powder ore and powder waste rock laying bottom materials are dry and without large blocks mixed in, and then the powder ore and powder waste rock are laid, the powder ore is laid in the overlapping area of the upper slicing room and the lower slicing room, and the powder waste rock is laid in the offset area of the upper slicing room, and the laying thickness is 20 cm. Using the method, the powder waste rock is used to replace the powder ore, the loss of the powder ore in the offset area is avoided, the downward stoping drift powder ore recovery rate is improved, and the mine production cost is reduced.

[0028] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A construction method for improving the recovery of fine ore from an underhand stope drift, characterised by: The construction method for improving the powder ore recovery rate of the downward mining gateway comprises the following steps: S1, demarcating a mine-waste boundary line (5): taking the lower compartment boundary line of the lower layer mine house (2) as the mine-waste boundary line (5) of the upper layer mine house (1); S2, powder ore (6) laying: the powder ore (6) is laid in the overlapping area of the upper layer mine house (1) and the lower layer mine house (2); S3, powder waste rock (7) laying: the powder waste rock (7) is laid in the offset area (4) of the upper layer mine house (1) to replace the powder ore (6) in the original offset area (4), thereby improving the powder ore recovery rate of the downward mining gateway; The step S1 mine-waste boundary line (5) is demarcated in the upper layer mine house (1) and coincides with the lower compartment boundary line of the lower layer mine house (2), and the lower compartment boundary line of the lower layer mine house (2) is determined according to the boundary line of the lower compartment side (3) exposed by the mining and preparation engineering; The steps S2 and S3 powder ore (6) and powder waste rock (7) are laid before the false bottom of the upper layer mine house (1) is made; Before the steps S2 and S3 powder ore (6) and powder waste rock (7) are laid, it is necessary to ensure that the site in the upper layer mine house (1) and the lower layer mine house (2) is leveled, without obvious pits and protrusions; The steps S2 and S3 powder ore (6) and powder waste rock (7) are laid to a thickness of 20 cm; The steps S2 and S3 powder ore (6) and powder waste rock (7) are dry and without large pieces mixed in, and after the laying is completed, the powder ore (6) and the powder waste rock (7) should be kept at the same level.

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