WO1999047755A1

WO1999047755A1 - Consolidation deposition method of materials containing moisture at deposition site

Info

Publication number: WO1999047755A1
Application number: PCT/JP1998/005119
Authority: WO
Inventors: Seishi Yamada
Original assignee: Toyoha Mining Co. Ltd.
Priority date: 1998-03-16
Filing date: 1998-11-13
Publication date: 1999-09-23
Also published as: AU1053299A; PE20000208A1; JPH11256562A

Abstract

A consolidation deposition method of materials containing moisture at a deposition site, characterized by comprising the steps of disposing horizontal drain members (10) at portions where the upper layer forms, or is to form, an aqueous phase portion, depositing one by one materials containing moisture on the drain members (10) and consolidating the deposit portion while keeping drainability at a high level. This method provides the effect that the deposit is compressed through consolidation of the deposit portion and thus to prolong life of the deposition site. Further, the method provides the effect that the foundation of a deposition site of one solution containing waste slag, which is constructed in depopulated areas of mountainous regions, can be improved within a short time, and can supply a flat land of a large area that can be utilized effectively. In this way, the deposit portion can be consolidated while drainability of the deposit site of materials containing the moisture is kept at a high level.

Description

Compaction deposition method in the deposition field of moisture containing material

Technical field

The present invention relates to a method for consolidating and depositing water-containing substances in a sedimentation yard, and more particularly to a method for separating ore containing waste, which is generated in a large amount in a flotation process for separating useful minerals from ores collected in a mine. The present invention relates to a consolidation method in a dumping site to be disposed.

Background art

Figure 4 is a flow chart showing an example of a preferential flotation system for complex sulfide ores. In this system, first, a mixed concentrate of Cu-Pb is recovered by flotation, leaving Ζη, iron sulfide and gangue in the tailings, and then (: !!! and Ζη, respectively). Flotation separation of iron sulfide and gangue Mineral liquor containing a large amount of waste slag generated in the flotation process is classified by cyclone 40 as shown in Fig. 5 Dams larger than the diameter are supplied above the levee 42 to grow the levee, while mineral effluent containing waste hulls smaller than the specified particle size is supplied to the dam area 44 and / or dam formed by the levee. The wastewater was discarded in the storage area 46. Table 1 shows the particle size distribution of the mineral liquor supplied to the cyclone 40, the underflow 40a and the overflow 40b of the cyclone 40 The underflow of cyclone 40 a, which is about 78% of waste with a particle size of 20 mm or more, Cyclone overflow 4 Ob, which is supplied above 42 and has a particle size of less than 200 mesh and is about 92% waste, is located in dam reservoir area 44 and Z or dam reservoir area 4 6 Supplied to

(Hereinafter the margin)

table 1

F: Mining (cyclone feed)

U. F.: Underflow

0. F.: Overflow

In such a deposit of ore slag containing wastewater, water penetrates deeply into the gaps between the sediments in the part of the dam reservoir area 44 below the groundwater level and in the sedimentation part of the dam reservoir area 46, and from the top, Supports the load. Therefore, the amount of waste that can be deposited above it is limited, as the sediment continues to exist without being compacted.

For example, if the growth rate of the embankment is 1 mZ and the remaining embankment height is 5 m, the sedimentation site will be full in 5 years. The mine had no place to dump mineral liquor unless a new dump was created, and had to be closed. In addition, the cost of several hundred million yen is required to reinforce the embankment, with the height of the embankment being 1 m.

Therefore, a specified thickness is applied to the surface of the sediment in the dam reservoir area 44 and the no or dam reservoir area 46. It is also conceivable to lay sand with a large particle size on the sand and use this sand layer as the drain layer. When the wastewater containing wastewater is disposed above the drain layer, water is quickly removed through the drain layer. Therefore, only the waste will be deposited, and the weight will compress the sediment and the deposition rate will decrease at each stage. However, this method has a disadvantage that a large amount of sand is required, and a small particle size waste gets into the sand, so that the drain effect is quickly eliminated.

When the height of the embankment 42 becomes s, the final embankment height is reached, a dam reservoir area 44 and / or a dam reservoir area 46 is formed inside the embankment. Geology of this area is a swamp or marsh, until the moisture force ^s missing cover soil planting work for can not be achieved the effective use had been left on, which was the entrance prohibited. It is extremely uneconomical to leave large unused flat areas in unused areas, usually built in depopulated mountainous areas. An object of the present invention is to solve the above-mentioned problems of the prior art, and to simply and inexpensively maintain the drainage property of a substance containing water in a good manner while maintaining good drainage properties, thereby consolidating the deposition portion, and preventing liquefaction as a ripple effect. It is an object of the present invention to provide a method of compacting and depositing a substance containing water, which can further increase the seismic strength.

Another object of the present invention is to provide a method for compacting sediment in a deposition site of a substance containing water, which can compress the sediment through compaction of the depositing part and thereby reduce the deposition rate. .

The object of the present invention is to further improve the foundation ground of the construction site for ore slag containing wastewater to be constructed in depopulated mountainous areas in a short period of time, and to supply large-area flat areas that can be effectively used to the area. It is an object of the present invention to provide a method for compacting and depositing a substance containing moisture, which can be performed in a deposition field.

Disclosure of the invention

The present invention for solving the above-mentioned problems is as follows.In a deposition site for a substance containing water, a horizontal drain member is disposed in a place where the upper layer is or should be an aqueous phase, and a substance containing water is successively deposited on the horizontal drain member. Provided is a method for compacting and depositing a substance containing water, which is characterized in that the depositing portion is compacted while maintaining good drainage properties.

According to a second aspect of the present invention, in the compaction deposition method according to the first aspect, a plurality of vertical drain members are laid at predetermined intervals on the already-deposited sediment. The upper end is connected to the horizontal drain member.

According to a third aspect of the present invention, in the consolidation deposition method according to the first or second aspect, waste containing a large amount of water-containing substances is generated in a flotation process for separating useful minerals from ores collected in a mine. Mineral liquor that contains slag and that contains sewage in the sedimentation site is classified and the sewage with a specified particle size or more is supplied above the levee to grow the levee. On the other hand, the method is characterized in that the mineral liquor containing waste slag having a predetermined particle size or less is disposed of in the dam reservoir area and the Z or dam reservoir area formed by the embankment. The invention according to claim 4 is the method according to claim 3, wherein the consolidation method comprises the steps of: A horizontal drain member is placed on top of which wastewater containing wastewater with a particle size of less than a specified size is discarded, and wastewater with a size of less than a specified size is deposited, thereby consolidating the deposited area while maintaining good drainage. It is characterized in that

According to a fifth aspect of the present invention, in the method of compacting and depositing according to the fourth aspect, when the horizontal drain member is disposed, waste having a predetermined particle size or less that has already been deposited in the dam reservoir area and / or the dam water storage area. A plurality of vertical drain members are laid at predetermined intervals in a stacking portion, and the upper ends thereof are connected to a horizontal drain member. The invention according to claim 6 is the method according to claim 4 or 5, wherein after the height of the embankment body reaches a predetermined height, the mineral liquor is transferred to the dam reservoir area and / or the dam storage area. Stopping disposal, improving drainage using horizontal drain members and consolidating the sedimentation area in a short period of time to improve the foundation ground in that area, and leveling the surface to effectively utilize depopulated mountain areas It is characterized by supplying the largest possible flat area.

The invention according to claim 7 is characterized in that, in the consolidation deposition method according to claim 6, as the earth and sand used for the formation, waste having a predetermined particle size or more obtained by classification is used. As the surface covering sediment after the completion of the sedimentation, drain water in the horizontal direction using wastewater with a good permeability and a predetermined particle size in the area to be constructed.

The invention according to claim 8 is a method according to any one of claims 1 to 7, wherein the horizontal drain member is formed of a pair of upper and lower synthetic fibers or a synthetic resin. A paddle made of a belt-shaped surface member and a plastic core plate material embossed in an uneven shape having a water passage that is mounted inside and has a water passage therethrough. It is characterized by comprising a member.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic cross-sectional view showing a deposition site for discarding ore liquor containing waste slag generated in a large amount in a flotation process for implementing the compaction deposition method according to the present invention.

FIG. 2 is a plan view of the deposition site of FIG.

FIG. 3 is a schematic perspective view of a paper drain member used when performing the compaction deposition method according to the present invention.

Figure 4 is a flow chart showing an example of a preferential flotation system for complex sulfide ores. FIG. 5 is a schematic cross-sectional view showing a conventional dumping site for ore liquor disposal.

BEST MODE FOR CARRYING OUT THE INVENTION

A method for compacting and depositing a substance containing water according to the present invention in a deposition field will be described in detail with reference to a preferred embodiment shown in the drawings.

FIG. 1 and FIG. 2 are a schematic cross-sectional view and a plan view, respectively, showing a deposition site for discarding a mineral liquor containing a large amount of wastewater generated in a flotation process for implementing the compaction deposition method according to the present invention.

The state shown in the figure is a stage where the dam reservoir 4 and the dam reservoir 6 have been formed to some extent inside the embankment 2. At this stage, on the surface of the sediment in the dam reservoir area 4 and the sediment deposited at the bottom of the dam reservoir area 6, a paper drain member 10 with a width of about 1 m and a length of about 8 Om Install in parallel at O m intervals.

As shown in FIG. 3, the paddle member 10 is composed of a pair of upper and lower synthetic fibers or a water-permeable belt-like surface member 12 made of a synthetic resin, and a plastic-made member mounted on the inside. It consists of a core plate material 14. A large number of concave-convex embossments 14a, 14b are formed in the core plate member 14, and a water passage 14c for allowing water to pass through the gap is formed. A variety of paddle members 10 are commercially available. For example, there is a public drain (trade name) manufactured by Asahi Engineering Co., Ltd., located at 41-118 Konan, Minato-ku, Tokyo. In the illustrated embodiment, the pair of upper and lower strip-shaped surface members 12 are independent members, and the forces connecting the edges are of course independent. Of course, they are formed in a cylindrical shape so that the core plate member 14 is inserted therein. May be. The end of the paper drain member 10 on the dam reservoir area 6 side is designed to prevent clogging caused by waste Therefore, it is preferable that the sealing is performed by an appropriate means.

In the illustrated preferred embodiment, a predetermined interval, e.g., 10 m in the horizontal and vertical directions, is provided in the sedimentation portion having a predetermined particle size or less, which has already been accumulated in the dam reservoir 4 and / or the dam reservoir 6. , A plurality of vertical drain members 20 are laid. The vertical drain member 20 is made of metal, has a conical sharp tip at the lower end, and has a number of lateral holes. Since the sediment in this region is sludge and the force required for driving is not so large, the vertical drain member 20 may be made of plastic. As will be described later, by performing the method of the present invention, the sediment above the level where the paper drain member 10 is installed is compressed to increase the density.

Therefore, the load applied to the sediment below the level where the paper drain member 10 is installed increases, and the water existing in the portion is pressurized. Due to this pressing force, the water is pushed into the vertical drain member 20 and further discharged through the paper drain member 10. As a result, moisture around the sediment below the level where the paper drain member is installed is removed, and the sediment in this part is also compressed.

Due to the consolidation of the deposit above and below the level where the paper drain member 10 is installed, the deposition rate of the deposit becomes lower in each step as compared with the conventional method. Thus, per unit time, for example, the height of the must be increased to 1 year hear embankment 2 is lower in each stage having a correspondingly cost power ^s cheaper further advantage. Even more, the total amount of waste that can ultimately be deposited can be dramatically increased, prolonging the life of the mine.

Further, after the height of the embankment 2 reaches the final height, the disposal of the mineral liquor into the dam reservoir 4 and / or the dam reservoir 6 is stopped. At this time, a dam reservoir area 4 and / or a dam reservoir area 6 are formed inside the embankment body 2, but drainage is performed in a short period of time using the paper drain member 10. Along with this, due to the consolidation of the sediment above and below the level where the paper drain member is installed, the consolidation is performed in a short period of time at the sediment, and the foundation ground in that area is improved. Furthermore, by leveling the surface, it will be possible to supply a large area of flat land that can be effectively used in mountainous depopulated areas with little flat land. Next, the method for compacting and depositing a substance containing water according to the present invention in a deposition field will be described with reference to the drawings. The method of the present invention generally comprises a step of arranging a horizontal drain member at a location where an upper layer of a deposition site of a water-containing substance is or should be an aqueous phase, and further comprising a water component thereon. And a step of consolidating the sedimented parts while maintaining good drainage by successively accumulating substances. The method of the present invention can be carried out after a certain amount of sediment has been deposited at the deposition site, or the present invention method can be carried out from a state where there is no deposit at the deposition site.

When the method of the present invention is carried out in a state where no deposit is present in the deposition site, all the deposits to be deposited are deposited while being compacted, and thus there is an advantage that the total amount of deposits that can be deposited can be maximized.

When the method of the present invention is carried out after a certain amount of sediment has been deposited at the deposition site, a plurality of vertical drain members are laid at predetermined intervals on the already-deposited sediment, and the upper end thereof is connected to the horizontal drain member. Power is preferable. The method of the present invention has an advantage that it can be applied to an existing depot. Further, by doing so, the deposits above and below the level where the horizontal drain member is installed can be compressed, and the deposition rate of the deposits can be made smaller in each step as compared with the conventional method. INDUSTRIAL APPLICABILITY The method of the present invention can be applied to a sedimentation yard that discards ore liquid containing a large amount of waste generated in a flotation process in which useful minerals are sorted out from ores collected in a mine. In that case, before discharging the mineral liquor to the sedimentation site, the mineral liquor is classified by the cyclone 3, and the waste 3a having a predetermined particle size or more is supplied above the bank 2 to grow the bank 2 ( The dashed line is shown in Fig. 1. On the other hand, the mineral liquor 3b containing wastewater having a predetermined particle size or less is transferred to the dam reservoir 4 and Z or dam reservoir 6 formed by the embankment. It can be discarded. Without transporting sediment, etc. from other areas, as the water level rises in the Dam Reservation Area 4 and Z or the Dam Reservoir 6, the embankment 2 constructed with wastewater of a predetermined grain size or higher is gradually raised. can do.

A horizontal drain member is placed on the surface of the sedimentation area that is already deposited in the dam reservoir area 4 and / or dam reservoir area 6 and is smaller than the specified particle size. By discarding the containing mineral liquor 3b and accumulating waste slag having a predetermined particle size or less, it is possible to consolidate the accumulation portion while maintaining good drainage.

When arranging the horizontal drain member, the dam reservoir area 4 and / or dam reservoir area 6 A plurality of vertical drain members 20 can be laid at predetermined intervals in a previously deposited pile of waste particles having a predetermined particle size or less, and the upper ends thereof can be connected to the horizontal drain members.

It is possible to compress wastes above and below the level at which the horizontal drain member is installed, and the deposition rate of sediment can be reduced in each step as compared with the conventional method.

For example, if a horizontal drain member and a vertical drain member 20 with a depth of 20 m are laid in a deposition site where sediment force s has already been deposited to a height of 5 Om and a further 14 m can be deposited, Assuming a speed of l mZ, the final embankment height will be 14 years. As a matter of fact, if the conventional method is continued without the consolidation method, the natural settlement amount can be suspended by 3.3 m, and the mineral liquor can be discarded for about 17 years in total. On the other hand, when the method of the present invention is carried out under the same conditions, a settlement amount of 8.4 mS can be expected due to the consolidation, and the mineral liquor can be continuously discarded for a total of 22 years. Therefore, there is an advantage that the period in which about 5 m of ore solution can be discarded is extended.

The economic effect is that the unused land becomes more useful due to the expanded use of the site, the land price rises, and the capacity of the dumping area increases. If this price is estimated as the construction cost for reinforcing the dump, it will be approximately 110 million yen. In addition, the life of the mine can be extended by about seven years, producing about 400,000 tonnes of ore.

Further, in other mines in operation, especially in mines with low rainfall, the supernatant water of the sedimentation site is repeatedly used as the water for beneficiation, but the method of the present invention may increase the amount of recovered supernatant water. it can. Therefore, the cost for new water supply such as well drilling can be reduced. In addition, since the residual reagent contained in the supernatant water is recovered, there is an advantage that the cost of reagents at the ore treatment plant can be reduced.

Further, by applying the method of the present invention to an old abolished mine, the amount of treated water is reduced, the cost of water treatment is reduced, and the function of preventing mine pollution can be improved.

It goes without saying that liquefaction of the substance containing water in the deposition site can be prevented. After the height of the embankment 2 reaches the final embankment height, the disposal of mineral liquor into the dam reservoir area 4 and Z or the dam reservoir area 6 will be stopped. According to the method of the present invention, the ground in the area is improved in a short period of time by drainage using the horizontal drain member and consolidation in the accumulation part. further, By leveling the surface, it is possible to supply large areas of flat land that can be effectively used in depopulated mountainous areas.

As a horizontal drain member, a water-permeable band-shaped surface member 12 made of a pair of upper and lower synthetic fibers or synthetic resin, and a plastic core embossed in an uneven shape having a water passage mounted inside and allowing water to pass inside. A paper drain member 10 composed of the plate material 14 can be used. It has the advantage of being cheap and having only one sexual ability. In the consolidation deposition method according to the present invention, in a deposition site for a substance containing water, a horizontal drain member is disposed at a location where the upper layer is or should be an aqueous phase, and a substance containing moisture is successively placed on the horizontal drain member. Since the sediment is deposited, it has an effect that the accumulation part can be compacted easily and inexpensively while maintaining good drainage.

The method of the present invention also has the effect of compressing the sediment through consolidation of the sediment, thereby prolonging the life of the sediment field.

The method of the present invention can further improve the foundation ground of a sewage-containing ore sewage field built in a mountainous depopulated area in a short period of time, and can supply a large-area flat area that can be effectively used to the area. Has an effect.

Claims

The scope of the claims

1. At the deposition site of water-containing substances, place a horizontal drain member where the upper layer is or should be an aqueous phase, and deposit water-containing substances on it one after another to improve drainage. A method for compacting and depositing a substance containing moisture in a deposition site, wherein the compaction part is compacted while maintaining good conditions.

2-The consolidation method according to claim 1, wherein a plurality of vertical drain members are laid at predetermined intervals on the already-deposited sediment, and an upper end thereof is connected to the horizontal drain member. Consolidation method in a deposition site for moisture-containing substances.

3. In the consolidated sedimentation method according to claim 1 or 2, the water-containing substance is a mineral liquor containing waste slag which is generated in a large amount in a flotation process of separating useful minerals from ores collected in a mine. Yes, in disposing of mineral liquor containing waste pit at the dump, the mineral liquor is classified, and waste hulls with a specified particle size or more are supplied to the upper part of the levee to grow the levee. Consolidation in a pile of water-containing substances, characterized in that the ore liquid containing the following wastewater is disposed of in the dam reservoir area and the dam reservoir area formed by the embankment. Method.

4. In the consolidated sedimentation method according to claim 3, a horizontal drain member is arranged on the surface of the sedimentation part having a predetermined particle size or less that has already been accumulated in the dam reservoir area and Z or the dam reservoir area. By discarding mineral liquor containing waste particles having a particle size of not more than a predetermined particle size and depositing waste liquid having a particle size of not more than a predetermined particle size, the sedimentation portion is compacted while maintaining good drainage. Compaction deposition method in a deposition site for a substance containing moisture.

5. In the consolidation deposition method according to claim 4, when arranging the horizontal drain member, a predetermined amount is deposited on a waste portion having a predetermined particle size or less already deposited in the dam reservoir area and / or the dam reservoir area. A method of compacting and depositing a substance containing moisture in a deposition site, wherein a plurality of vertical drain members are laid at intervals and the upper ends thereof are connected to the horizontal drain members.

6. The consolidation method according to claim 4 or 5, wherein after the height of the embankment body reaches a predetermined height, the disposal of ore liquid into a dam reservoir area and a Z or a dam storage area is stopped, The drainage area using condensed materials and the consolidation in the sedimentation area shorten the area in a short time.

1 〇 A consolidation method in a deposition site for water-containing substances, characterized by improving the ground of the country and providing a large area of flat land that can be effectively used in depopulated mountainous areas by leveling the surface.

7. The consolidation method according to claim 6, wherein a waste having a predetermined particle size or more obtained by classification is used as the soil used for the formation. Consolidation method.

8. The consolidation deposition method according to any one of claims 1 to 7, wherein the horizontal drain member is a pair of upper and lower upper and lower water-permeable strip-shaped surface members made of synthetic fibers or synthetic resin, and attached to the inside thereof. A method of depositing consolidation in a deposition site for a substance containing moisture, comprising a paper drain member comprising a plastic core plate material embossed into an uneven shape having a water passage through which water passes.