CN114856568B - Room-column mining method suitable for stoping residual rock phosphate ore - Google Patents

Abstract

The invention discloses a room-column mining method suitable for stoping residual phosphate ores, which comprises the following steps: determining stope structural parameters, carrying out accurate mining and cutting, reinforcing and supporting a goaf top plate before stoping, carrying out stoping finally, carrying out ore carrying and dry filling after rock drilling blasting, ventilation and ore leveling, and gradually stoping ore. According to the invention, the reserved ore pillar is aligned with the residual ore pillar of the upper goaf, so that the condition of the ore pillar of the goaf is fully utilized. In the unstable region of local geology, this application is through keeping the ore body between the adjacent ore pillar not exploiting and staying to establish as the bottom plate, makes to form between two ore pillars and falls "door" font arched column, further strengthens the stability of stope structure and the supporting effect of ore pillar. The stoping method for the phosphorite residual ore combines with a complex engineering environment, effectively utilizes the residual ore pillar condition of the goaf, improves the stability of a stope structure, effectively ensures the safety of stoping operation, and has low production cost and high recovery rate.

Description

Room-column mining method suitable for stoping residual rock phosphate ore

Technical Field

The invention relates to the field of mining methods, in particular to a room-pillar mining method suitable for stoping residual phosphate ores.

Background

When mining such gently inclined ore bodies as phosphorite, shallow Kong Fangzhu method is often adopted for stoping under the condition of higher cost of filling mining technology. When the phosphorite is mined from the upper phosphorus layer (Ph 3), the middle phosphorus layer (Ph 2) and the lower phosphorus layer (Ph 1) from top to bottom, the safety, the high efficiency and the economic exploitation of the ore body are difficult to realize due to the restriction of occurrence depth, engineering conditions, ore removal, support and the like. In addition, due to the limitation of roof management and support, phosphorite exploitation only usually recovers the upper phosphorite (Ph 3) position with higher taste and smaller exploitation difficulty in the ore body, so that the waste of low-quality ore sources is caused, and a large amount of precious mineral resources are lost.

Based on the above, how to efficiently and safely recycle complex residual ore bodies with goafs at the upper part has important practical significance for full utilization of mineral resources, extension of service life of mines, improvement of ore recovery efficiency and the like. Aiming at the defects of poor safety, low stoping cost, poor stoping efficiency and the like of the gently inclined phosphorite residue ore bodies with goaf after the upper ore bodies are mined, adopting the traditional mining method and the existing technical level to perform stoping operation, the method for exploring the low-consumption, safe and efficient mining of the phosphorite residue ore under the complex goaf is imperative. Therefore, there is a need to develop a method suitable for recovery of residual phosphate ores to meet the above-mentioned needs.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a room-column mining method suitable for stoping the residual phosphate rock, which can reduce the difficulty of stoping the residual phosphate rock and improve the safety and the working efficiency of stoping.

The embodiment of the invention provides a room-column mining method suitable for stoping residual phosphate ores, which comprises the following steps:

s100: determining stope structural parameters: determining the size of a mine room in a tray area and the arrangement position of ore pillars according to the mine yield and technical conditions, wherein the arrangement position of the ore pillars is aligned with the position of the ore pillars in the upper goaf;

s200: picking and cutting: the upper goaf is reached along the middle section transportation roadway through the pedestrian ventilation communication channel and is used as a top space; forming a cutting zone at one end of the disc zone, developing a top layer rock drilling gallery along the trend of the disc zone based on the cutting zone, and distributing the rock drilling galleries along the trend of the disc zone at first intervals to provide a free surface and a transportation channel for subsequent stoping;

s300: reinforcement of the headspace: reinforcing and supporting the top plate of the upper goaf;

s400: and (3) stoping: firstly, determining a tray zone layering and a stoping sequence, sequentially mining areas without preset ore pillars from top to bottom during stoping, and then mining ore bodies among the ore pillars; the mining process comprises rock drilling blasting, ventilation and ore leveling; ventilation is used for realizing the discharge of blasting gas, and leveling ore comprises manually or mechanically leveling the surface of the ore pile which is broken down to form an ore dropping area; in the mining process, for a geology unstable region, keeping ore bodies between two adjacent ore pillars at the lower part of a goaf, and setting the ore bodies as a bottom plate, wherein an inverted-door-shaped arch pillar is formed between the bottom plate and the two adjacent ore pillars;

s500: carrying ores: carrying ores in the ore dropping area, enabling a scraper to reach an ore room from a top-cutting conveying ramp and enter the ore dropping area through a rock drilling gallery to scoop ores, and then enabling the scraper to reach a main footrill through a middle section conveying gallery and an intra-vein ramp and convey the ores to the outside of each pit mouth and near an ore yard;

s600: and (3) dry filling: dry filling the area in which the ore has been carried;

s700: and repeating the steps S400 to S600 to perform the panel mining work and reserving the ore pillars according to the arrangement positions of the ore pillars in the step S100.

The room-column mining method suitable for stoping the phosphorite residue ore provided by the embodiment of the invention has at least the following beneficial effects: the room column mining method suitable for stoping the phosphorite residue ore provided by the application is suitable for stoping the phosphorite residue ore with a goaf on the upper layer, and comprises the following steps: determining stope structural parameters, and then performing mining accuracy and cutting work to gradually form a stope working face; before stoping, reinforcing and supporting the goaf roof; and finally, stoping, carrying out ore transportation and dry filling after rock drilling blasting, ventilation and ore leveling, and gradually stoping ore from top to bottom. According to the invention, the reserved ore pillar is aligned with the residual ore pillar of the upper goaf, so that the condition of the ore pillar of the goaf is fully utilized. In the local geology unstable region, the mining field structure stability and the supporting effect of the ore pillars are further enhanced by keeping ore bodies among adjacent ore pillars not mined and being set as a bottom plate. The stoping method for the phosphorite residual ore combines with a complex engineering environment, effectively utilizes the residual ore pillar condition of the goaf to improve the stability of a stope structure, effectively ensures the safety of stoping operation, and has low production cost and high recovery rate.

According to some embodiments of the invention, during the recovery of step S400, for geologically stabilized areas, the ore pillars penetrate the seam to increase the recovery rate of the ore pillars; for a geology unstable region, keeping ore bodies between two adjacent ore pillars, and setting the ore bodies as a bottom plate; the thickness of the base plate is adjusted according to the unstable condition of the area and the layering condition of the tray area, and the ore bodies between two adjacent ore pillars are reserved in the layering close to the bottom layer of the tray area as the base plate along with the reduction of the dangerous grade of the area.

According to some embodiments of the present invention, in step S200, the process of forming a cutting space at one end of the disc area includes developing a cutting slot downward at an end of the ore room and penetrating downward gradually, so as to form a cutting courtyard of the phosphorite residue.

According to some embodiments of the present invention, the disc differentiation layer in step S400 is layered according to the sectional height of the phosphorite residue, the layered height is 6m, and the one-time stoping is completed with less than 6 m.

According to some embodiments of the present invention, the extraction sequence in step S400 is determined to be the extraction from both ends of the extent in the direction of the extent direction toward the central ramp, and the extraction is performed from top to bottom in the direction of the extent direction.

According to some embodiments of the present invention, the reinforcing the top plate of the upper goaf in step S300 includes first arranging anchor nets on the top plate, and then arranging at least one anchor rod at intervals of a second distance along the axial direction and the transverse direction of the goaf, so as to ensure the stability of the top plate of the goaf in the subsequent stoping process.

According to some embodiments of the present invention, the filling material used for dry filling in step S600 selects waste rock or rock material of a waste rock field that has been mined in a sectional level while covering concrete to strengthen the dry filling area.

According to some embodiments of the present invention, in step S400, the process of rock drilling and blasting is to drill horizontal fan-shaped blast holes in a horizontal direction perpendicular to the cutting slot and perform shallow hole blasting with the cutting slot as a compensation space, then continue horizontal drilling and blasting with the blasted pile as a working platform, gradually form a blasted pile area, and finally continuously discharging ores in a large scale.

According to some embodiments of the present invention, step S400 forms a ore-dropping area, step S500 forms a ore-transporting area, step S600 forms a dry-filling area, and in step S700, the maximum spans of the dry-filling area and the ore-dropping area are determined according to the stope structural parameters calculated in step S100, and after the maximum spans are satisfied, steps S400 to S600 are repeatedly circulated, and a state in which each step is operated in a panel area in a continuous and simultaneous manner is formed.

According to some embodiments of the invention, the room-pillar mining method for stoping the phosphorite residue is suitable for mining phosphorite residue ore bodies with complex engineering environment, wherein the phosphorite residue ore bodies are mined by upper phosphorite.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram of a plan layout of a mining room of a room-pillar mining method suitable for stoping residual ores of phosphorite, provided by an embodiment of the invention;

FIG. 2 is a schematic cross-sectional view at II-II in FIG. 1, according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the section III-III of FIG. 1, according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of the section IV-IV of FIG. 1 according to an embodiment of the invention;

fig. 5 is a schematic diagram of a blasthole for forming a cutting area and rock drilling and blasting according to an embodiment of the present invention.

Reference numerals: the middle section transportation roadway 11, the top-cutting transportation ramp 12, the upper layered transportation ramp 13, the lower layered transportation ramp 14, the pedestrian ventilation passage 15, the cutting groove 21, the top-cutting rock drilling roadway 22, the ore pillar 31, the weak ore pillar 32, the bottom plate 33, the vertical middle-deep blast hole 41, the horizontal fan-shaped blast hole 42 and the anchor rod 51.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, mounting, connection, etc. should be construed broadly and may be a fixed connection or a movable connection, a removable connection or a non-removable connection, or an integral connection, for example; either directly, indirectly through intermediaries, or in communication with the interior of two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model provides a room post mining method (hereinafter abbreviated as mining method) suitable for incomplete ore extraction of phosphorite is applicable to the exploitation of the gentle slope phosphorite ore body that the upper portion ore body has been exploited, and such incomplete ore upper portion exists the collecting space area, and engineering environment is complicated, consequently has great exploitation degree of difficulty. By adopting the mining method provided by the application, the mining difficulty of the residual ore can be reduced, and the safety and the mining efficiency of the operation are effectively improved. The mining method proposed in the application is described by taking a certain phosphorite ore body III ore section in Hubei as an example. The III ore section of the phosphorite ore body is a gently inclined ore body, a comprehensive mining method is adopted for mining a medium-high grade area of a phosphorus layer (Ph 1) on a mining area since ore building, so that great mineral resource waste and environmental destruction are caused, and the phosphorite residual ore on the lower layer is recovered after being rearranged.

The mining method provided by the application comprises the following steps:

step S100: and determining stope structure parameters. Fig. 1 shows a plan view of a room for a phosphorite residue mine provided in an embodiment of the present application, where a tray is divided along a mine body trend according to mine yield and technical conditions, and the size of the room in the tray and the layout position of pillars 31 are determined. Referring to fig. 1, specific size division of extents is as follows: the length is 200 m, the middle section height is 40 m, the ore blocks are inclined to be 165.34 m, continuous ore pillars 31 with the width of 10 m are reserved between the disk areas, the top pillars are 10 m, the bottom pillars are 14.5 m, the size of the ore pillars 31 is 8 m x 8 m, and the width of a ore room is 10.5 m. It should be noted that, the arrangement position of the ore pillar 31 in the tray area is aligned with the position of the ore pillar 31 in the upper goaf, and the reserved ore pillar 31 and the existing ore pillar 31 in the upper goaf play a role in supporting the ore body together, so that the safety of the stoping operation area is greatly improved.

Step S200: and (5) performing accurate sampling and cutting. The mining standard work refers to tunneling a mining standard roadway, taking ore blocks as independent units, and creating conditions of pedestrians, rock drilling, ore drawing, ventilation and the like in the ore blocks. The cutting work means that free surfaces and free spaces are opened up for large-scale ore recovery in the ore blocks which are already accurately extracted. In the mining of the residual ore in this embodiment, the middle section transportation roadway 11 of the residual ore of the phosphorite is communicated with the pedestrian ventilation communication channel 15 to reach the upper mining space, the mining space at the upper part is used as the top space of the mining of the residual ore, and a cutting space is formed at one end of the disc-area ore room. After the cutting space is opened, the top-layer drilling drift 22 is developed along the trend of the disc zone based on the cutting space, and the drilling drift is distributed along the trend of the disc zone at intervals of a first distance.

Specifically, the cutting space is formed by the following steps: the end part of one end of the disc area ore room is downwards provided with a cutting groove 21, the cutting groove 21 is continuously downwards provided with a cutting courtyard penetrating through the phosphorite residual ore, and the cutting courtyard is a cutting space. Fig. 5 shows a manner of opening blast holes in the process of developing the cutting groove 21, a plurality of vertical middle-deep blast holes 41 are opened downwards at the end part of a stope, the cutting groove 21 is formed after gunpowder is filled and blasted, and a cutting courtyard can be formed by continuously developing downwards. Based on the cutting of the patio, a number of horizontal sector-shaped blastholes 42 are laid in the horizontal direction, as per the method shown in fig. 5, and the stemming powder blasted is used to open up the top-level rock drilling gallery 22. Referring to fig. 1, a roof-cutting drilling gallery 22 is opened along the course of the disc, the width of the gallery being 2 to 3 meters. In the embodiment of the application, the value of the first distance is 19.5 meters, and a plurality of drilling galleries are distributed every 19.5 meters along the disc area trend. The rock drilling gallery is used for providing a free surface for rock drilling and blasting and a transportation channel for ore transportation for subsequent stoping operations. It should be noted that, in other embodiments, the setting positions, i.e. the setting number, of the drilling galleries may be designed according to the actual situation of the ore body, which is not further limited herein.

Step S300: the headspace is reinforced. In the process of mining the residual ore, a goaf remained at the upper part is used as a stoping head space. In order to avoid potential safety hazards of mining operation of lower residual ores due to complex engineering environment remained in an upper goaf, a top plate of the goaf needs to be reinforced and supported. The concrete reinforcement process is as follows: the roof is first anchored and then at least one anchor rod 51 is arranged at a second distance along the axial direction and the transverse direction of the goaf. For example, in the embodiment of the present application, the value range of the second distance is 2 meters to 2.5 meters, that is, a plurality of anchor rods 51 are distributed every 2 meters to 2.5 meters along the axial direction and the transverse direction of the goaf, so as to ensure that the top goaf is kept stable in the subsequent stoping operation. It should be noted that the number of the anchor rods depends on the stability of the upper goaf, and may be 1 or more, which is not specifically limited herein.

Step S400: and (5) carrying out stoping operation. In the stoping operation, layering is firstly carried out according to the disc area structural parameters, and the stoping sequence is determined. In the stoping process, according to the size of the ore room, the size of the ore pillars 31 and the preset positions of the ore pillars 31 determined in step S100, the areas without the preset ore pillars 31 are mined sequentially from top to bottom, and then ore bodies among the ore pillars 31 are mined. When mining ore bodies among the ore pillars 31, the ore pillars 31 can penetrate through an ore layer for a region with more stable geological conditions, so that the recovery rate of the ore bodies is improved; for a geologically unstable region with a more complex environment, the region is broken more than the roof at other positions, the stability is poor, and the supporting force of the pillar 31 is weaker, so that the region is called a weak pillar 32. The ore body between two adjacent weak pillars 32 in the lower part of the goaf is reserved in the present application, and is not mined, and is reserved as a bottom plate 33. The ore body of the bottom plate 33 part and the weak ore pillars 32 on two sides form an arch with an inverted door shape, so that the exposure area of the goaf of the ore room under the arch is reduced, the supporting effect of the ore pillars is enhanced, the goaf has higher structural stability, and a good area protection effect is achieved on the goaf in a geology unstable area.

It should be noted that the thickness of the bottom plate 33 left between the two weak pillars 32 may be adjusted according to the dangerous situation of the area and the situation of the partition layer. When the danger level of the area is higher, the ore bodies between the two weak ore pillars 32 can be fully reserved as the bottom plate 33, and the larger the thickness of the bottom plate 33 is, the higher the structural stability of the inverted-door-shaped arch is, and the better the supporting and protecting effects on the unstable area are. As the zone risk level decreases, the ore bodies layered upwardly between the two weak pillars 32 may be mined appropriately, leaving only the ore bodies layered downwardly near the bottom of the tray zone as the floor 33. The method can ensure the protection effect of the local dangerous area, can improve the exploitation rate of the ore body, and can avoid the waste of ore body resources to the maximum extent. For example, in the application, layering is carried out according to the sectional height of the phosphorite residual ore, the layering height of each layer is 6 meters, the total layering is 3 layers, and the uppermost layer less than 6 meters is subjected to one-time stoping. In one dangerous area in this embodiment, only the second layer and the bottommost layer of ore bodies between the two weak ore pillars 32 are reserved as the bottom plate 33, the topmost layer of ore bodies are mined back, inverted gate-shaped arches are formed between the bottom plate 33 and the weak ore pillars 32 on two sides, the structural stability of the goaf is improved, and the safety of mining operation in the local dangerous area is ensured.

Further, the stoping sequence determined in the application is that stoping is carried out from two ends of a disc zone to a central ramp direction along the trend direction of the disc zone, and mining is carried out from top to bottom along the trend direction of the disc zone. Referring to fig. 1, each layer of the tray area is dug with a transportation ramp for transporting ore bodies, and the steps from the topmost layer to the bottom layer are as follows: a topping transport ramp 12, an upper layered transport ramp 13, and a lower layered transport ramp 14. When the disc zone is mined, each layer of mining is sequentially carried out from top to bottom, and the mining is carried out along the directions of the two ends of the disc zone to the central ramp in the mining process of each layer.

The ore body mining process includes rock drilling blasting, ventilation and ore leveling, wherein ventilation is used for realizing blasting gas discharge, and ore leveling includes manually or mechanically leveling the surface of the ore pile under collapse to form an ore dropping area. Further, a working space needs to be reserved between the surface of the ore heap and the working face in the process of leveling the ore so as to continue rock blasting. The rock drilling and blasting process specifically comprises the steps of drilling horizontal sector blast holes 42 in the horizontal direction perpendicular to the cutting grooves 21, performing shallow hole blasting by taking the cutting grooves 21 as compensation spaces, continuing horizontal drilling and blasting by taking a blasting ore pile as a working platform, gradually blasting forward along the trend, leading the exploitation of a lower ore layer to the exploitation of an upper ore layer, and finally continuously and massively extracting ores.

Step S500: carrying ores. When the tray length of the ore dropping area reaches a certain length, carrying ore to the previous ore dropping area. The scraper arrives at a mine room from the top-cutting conveying ramp 12, enters a ore dropping area through a top-cutting rock drilling gallery 22, shovels ores, passes through the middle section conveying gallery 11 and the intra-vein ramp to a main tunnel, is conveyed to an ore yard near the outer side of each pit mouth, and is finally conveyed to the ore main yard through a ground automobile.

Step S600: and (5) dry filling. When the length of the tray area in which the ore is carried reaches a certain length, the area in which the ore is carried is dry-filled. Wherein the filling material used for dry filling selects waste stones or stones of a waste stone field which have been mined in a sectional level, while covering concrete to reinforce the dry filling area.

Step S700: the operations of the panel mining are repeated from step S400 to step S600 and the pillars 31 are reserved according to the layout positions of the pillars 31 in step S100. Wherein, step S400 forms a ore dropping area, step S500 forms a ore transporting area, and step S600 forms a dry filling area. When the mining operation is performed, the maximum spans of the dry filling area and the ore dropping area are determined according to the stope structural parameters calculated in the step S100, after the maximum spans are met, the steps S400 to S600 are repeatedly circulated, the state that each step is continuously and simultaneously operated in the subarea is formed, namely, each area of the three steps is formed in the subarea and simultaneously operated, and the continuous operation is sequentially performed along the stoping direction. The working mode can realize simultaneous dry filling, ore transportation and ore mining and ore dropping in the same disc area, and greatly improves the stoping efficiency.

In summary, the mining method provided by the application is suitable for mining the residual phosphate ore which is mined by the upper phosphate rock (Ph 3), and has the following beneficial effects:

(1) The complex engineering environment of the mining of the phosphorite residue with the goaf on the upper layer can be well dealt with.

(2) The method can realize simultaneous filling, ore transportation and ore mining and ore dropping among the same disc areas, and greatly improves the stoping efficiency.

(3) The complex engineering environment can be combined, the ore pillar conditions of the goaf can be fully utilized, the inverted-door-shaped arch pillar design is adopted for the place with unstable geological conditions, the operation safety of the goaf is improved, the ore pillar 31 can penetrate through an ore layer and the recovery rate of an ore body is improved for the place with stable geological conditions.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.

Claims (10)

1. The room-column mining method suitable for stoping the phosphorite residue is characterized by comprising the following steps of:

s100: determining stope structural parameters: determining the size of a mine room in a tray area and the arrangement position of ore pillars according to the mine yield and technical conditions, wherein the arrangement position of the ore pillars is aligned with the position of the ore pillars in the upper goaf;

s200: picking and cutting: the upper goaf is reached along the middle section transportation roadway through the pedestrian ventilation communication channel and is used as a top space; forming a cutting zone at one end of the disc zone, developing a top layer rock drilling gallery along the trend of the disc zone based on the cutting zone, and distributing the rock drilling galleries along the trend of the disc zone at first intervals to provide a free surface and a transportation channel for subsequent stoping;

s300: reinforcement of the headspace: reinforcing and supporting the top plate of the upper goaf;

s400: and (3) stoping: firstly, determining a tray zone layering and a stoping sequence, sequentially mining areas without preset ore pillars from top to bottom during stoping, and then mining ore bodies among the ore pillars; the mining process comprises rock drilling blasting, ventilation and ore leveling; ventilation is used for realizing the discharge of blasting gas, and leveling ore comprises manually or mechanically leveling the surface of the ore pile which is broken down to form an ore dropping area; in the mining process, for a geology unstable region, keeping ore bodies between two adjacent ore pillars at the lower part of a goaf, and setting the ore bodies as a bottom plate, wherein an inverted-door-shaped arch pillar is formed between the bottom plate and the two adjacent ore pillars;

s500: carrying ores: carrying ores in the ore dropping area, enabling a scraper to reach an ore room from a top-cutting conveying ramp and enter the ore dropping area through a rock drilling gallery to scoop ores, and then enabling the scraper to reach a main footrill through a middle section conveying gallery and an intra-vein ramp and convey the ores to the outside of each pit mouth and near an ore yard;

s600: and (3) dry filling: dry filling the area in which the ore has been carried;

s700: and repeating the steps S400 to S600 to perform the panel mining work and reserving the ore pillars according to the arrangement positions of the ore pillars in the step S100.

2. The room-pillar mining method according to claim 1, wherein in the stoping process of step S400, for a geologically stable region, pillars penetrate through the seam to increase the stoping rate of the pillars; for a geology unstable region, keeping ore bodies between two adjacent ore pillars, and setting the ore bodies as a bottom plate; the thickness of the base plate is adjusted according to the unstable condition of the area and the layering condition of the tray area, and the ore bodies between two adjacent ore pillars are reserved in the layering close to the bottom layer of the tray area as the base plate along with the reduction of the dangerous grade of the area.

3. The method according to claim 1, wherein in step S200, the process of forming a cutting space at one end of the pan region includes developing a cutting slot downward at the end of the room and penetrating the cutting slot downward gradually, so as to form a cutting patio of the residual phosphate ore.

4. The room-column mining method for stoping of residual phosphate rock according to claim 1, wherein in step S400, the disc distinction layering is performed according to the segmented height of the residual phosphate rock, the layering height is 6m, and the stoping is completed at one time with less than 6 m.

5. The method according to claim 1, wherein the stoping sequence in step S400 is determined to be a stoping from both ends of the panel toward the central ramp in the direction of the trend of the panel, and a stoping is performed from top to bottom in the direction of the trend of the panel.

6. The method according to claim 1, wherein the step S300 of reinforcing the top plate of the upper goaf comprises arranging anchor nets on the top plate, and then arranging at least one anchor rod at intervals of a second distance along the axial direction and the transverse direction of the goaf to ensure the stability of the top plate of the goaf in the subsequent stoping process.

7. A room and pillar mining method according to claim 1, wherein the filling material used for dry filling in step S600 selects rock material of a waste rock or waste rock site of which a sectional level has been mined while covering concrete to reinforce the dry filling area.

8. A room and pillar mining method according to claim 3, wherein in step S400, the process of rock drilling and blasting is to drill horizontal sector blast holes in the horizontal direction perpendicular to the cutting slot and to perform shallow hole blasting with the cutting slot as a compensation space, then to continue horizontal drilling and blasting with the blasted pile as a working platform to form a blasted pile area, and finally to continuously discharge ores in large scale.

9. The room-pillar mining method according to claim 1, wherein the step S400 forms a ore-dropping area, the step S500 forms a ore-transporting area, the step S600 forms a dry-filling area, the maximum spans of the dry-filling area and the ore-dropping area are determined according to the stope structure parameters calculated in the step S100 in the step S700, and after the maximum spans are satisfied, the steps S400 to S600 are repeatedly circulated, and the states in which the respective steps are continuously and simultaneously operated in the tray area are formed.

10. The room-pillar mining method for stoping residual phosphate rock, which is characterized in that the room-pillar mining method for stoping residual phosphate rock is suitable for mining residual phosphate rock ore bodies which are mined by upper phosphate rock, have goafs at the upper parts and have complex engineering environments.

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