CN110550906A - Stabilizing agent and blocking method for arsenic-containing waste residue storage yard - Google Patents
Stabilizing agent and blocking method for arsenic-containing waste residue storage yard Download PDFInfo
- Publication number
- CN110550906A CN110550906A CN201910734366.4A CN201910734366A CN110550906A CN 110550906 A CN110550906 A CN 110550906A CN 201910734366 A CN201910734366 A CN 201910734366A CN 110550906 A CN110550906 A CN 110550906A
- Authority
- CN
- China
- Prior art keywords
- arsenic
- containing waste
- stabilizing agent
- waste residue
- slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 81
- 239000002699 waste material Substances 0.000 title claims abstract description 64
- 239000003381 stabilizer Substances 0.000 title claims abstract description 43
- 230000000903 blocking effect Effects 0.000 title claims abstract description 35
- 238000003860 storage Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000004888 barrier function Effects 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 41
- 239000003795 chemical substances by application Substances 0.000 claims description 27
- 239000010881 fly ash Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 239000011575 calcium Substances 0.000 claims description 13
- 229910052791 calcium Inorganic materials 0.000 claims description 13
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000292 calcium oxide Substances 0.000 claims description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 9
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical group O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 8
- 229940080314 sodium bentonite Drugs 0.000 claims description 8
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 8
- 230000008961 swelling Effects 0.000 claims description 7
- 239000011398 Portland cement Substances 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 6
- 235000011152 sodium sulphate Nutrition 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 229940092782 bentonite Drugs 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims description 2
- 239000000440 bentonite Substances 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- 239000006227 byproduct Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims description 2
- 150000002505 iron Chemical class 0.000 claims description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 2
- 235000011151 potassium sulphates Nutrition 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 239000000825 pharmaceutical preparation Substances 0.000 claims 1
- 239000003344 environmental pollutant Substances 0.000 abstract description 12
- 231100000719 pollutant Toxicity 0.000 abstract description 12
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 230000000149 penetrating effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 24
- 239000010410 layer Substances 0.000 description 19
- 239000002893 slag Substances 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 239000010754 BS 2869 Class F Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 239000002352 surface water Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 238000011835 investigation Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 238000011066 ex-situ storage Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000001164 aluminium sulphate Substances 0.000 description 1
- 235000011128 aluminium sulphate Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00775—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a stabilizing agent and a blocking method for an arsenic-containing waste residue storage yard. The stabilizing agent reasonably configures the types and the content of various raw materials, and can react with the stabilizing agent when the arsenic-containing pollutants pass through the barrier material by adding the stabilizing agent in the process of blocking the arsenic-containing waste residues to generate substances with stable forms, so that the arsenic-containing pollutants are prevented from penetrating through the barrier material, the time for the pollutants to penetrate through the barrier material can be prolonged, the service life of the barrier layer is prolonged, and the treatment effect of the arsenic-containing waste residue storage yard is improved.
Description
Technical Field
The invention belongs to the technical field of treatment of arsenic-containing waste residues on yards, and particularly relates to a stabilizing agent and a blocking method for the arsenic-containing waste residues on yards.
Background
With the rapid development of the industry in China, the environmental problem is increasingly prominent. At present, most arsenic-containing waste residues are in a disordered stockpiling or simple landfill state, and arsenic diffuses to underground water in the form of leachate, so that secondary pollution is caused. The method for treating the arsenic-containing waste residue yard comprises in-situ treatment and ex-situ treatment. Generally, the existing amount of arsenic-containing waste residues is large, the arsenic-containing waste residues are located in remote areas and far away from crowds, and the ex-situ disposal cost is high, so that the in-situ disposal becomes a common mode for disposing the arsenic-containing waste residues at present.
the barrier technology is an important means for in-situ disposal at present, and common barrier technologies include a covering barrier technology and the like, wherein the covering barrier technology prevents the arsenic-containing waste slag from polluting the surrounding environment by covering a barrier layer on the arsenic-containing waste slag.
disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect that the treatment effect of the existing arsenic-containing waste residue yard needs to be improved, and further to provide a stabilizing agent and a blocking method for the arsenic-containing waste residue yard.
The stabilizing agent provided by the invention comprises the following raw materials in parts by weight:
further, the iron-containing material is at least one of iron (hydroxide) ore, iron salt, zero-valent iron, or an iron-containing industrial byproduct;
the sulfate is sodium sulfate and/or potassium sulfate.
further, the coating also comprises 2-8 parts by weight of an expanding agent.
further, the expanding agent is at least one of a sulphoaluminate expanding agent, a calcium oxide expanding agent and a magnesium oxide expanding agent; wherein the sulphoaluminate expanding agent is a CSA calcium aluminium sulphate impervious expanding agent purchased from Henan energy-gathering novel building materials Co.Ltd; the calcium oxide expanding agent is purchased from Henan energy gathering synthetic special material Co., Ltd, and has the product model of CAL; the magnesium oxide expanding agent is purchased from a magnesium oxide expanding agent of Wuhan three-source special building materials, Inc.;
The cement is portland cement.
further, the bentonite is sodium bentonite, and the particle size of the sodium bentonite is 150-250 meshes;
the particle size of the clay is 150-250 meshes;
further, the sand is fine sand, and the average grain diameter of the fine sand is 0.12mm-0.25 mm;
The fly ash is low-calcium fly ash, and the content of calcium oxide in the low-calcium fly ash is not more than 46 wt%.
in addition, the invention also provides a blocking method for the arsenic-containing waste residue storage yard, which comprises the following steps:
Positioning the arsenic-containing waste residue storage yard, punching a hole at the positioning position to form a grouting hole, and leading the hole to penetrate the arsenic-containing waste residue to a fractured bedrock;
Mixing the stabilizing agent with water to obtain slurry;
and injecting the slurry into the arsenic-containing waste residues through the grouting holes, filling the cracks of the fractured bedrock, and forming a barrier layer on the interface of the arsenic-containing waste residues and the fractured bedrock.
further, the hole spacing between adjacent grouting holes is 0.86-3.4 m;
the mass ratio of the stabilizing agent to water is 1: (0.25-0.5).
Further, the injection pressure of the slurry is 20-40 Mpa;
The flow rate of the slurry is 70-100L/min, and the influence radius is 0.5-2 m.
Further, the thickness of the barrier layer is 20cm-40 cm.
the technical scheme of the invention has the following advantages:
(1) The stabilizing agent provided by the invention is reasonably prepared according to the types and the contents of various raw materials, and in the process of blocking the arsenic-containing waste residue, the stabilizing agent is added, so that the arsenic-containing pollutants can react with the stabilizing agent when passing through the blocking material to generate substances with stable forms, the arsenic-containing pollutants are prevented from penetrating through the blocking material, the time for the pollutants to penetrate through the blocking material can be prolonged, the service life of the blocking layer is prolonged, and the treatment effect of the arsenic-containing waste residue storage yard is improved.
(2) the blocking method for the arsenic-containing waste residue yard adopts a horizontal liner blocking mode of the arsenic-containing waste residue yard, is suitable for blocking or blocking cracks at the bottom of the arsenic-containing waste residue yard, adds a stabilizing agent into a blocking material, and enables pollutants to react with the stabilizing agent when passing through the blocking material to generate a stable form, so that the pollutants are prevented from penetrating through the blocking material, the time of the pollutants penetrating through a blocking wall can be prolonged, and the service life of the blocking layer is prolonged. The blocking method can seal the pollutant arsenic in the slag pile, cut off the way of the pollutant migrating and exposing to the surrounding surface water or underground water through the bottom or bedrock crack, eliminate the environmental risk and achieve the purpose of risk management and control.
drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of the arrangement of grouting holes in the present invention;
FIG. 2 is a schematic view of the barrier of the arsenic-containing waste residue yard according to the present invention;
Reference numerals:
1-grouting holes; 2-grouting hole spacing; 3-radius of influence; 4-grouting the overlapping part; 5-arsenic-containing waste residue storage yard; 6-a barrier layer; 7-fractured bedrock; 8-crack.
Detailed Description
the technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
example 1
The embodiment provides a stabilizing agent and a blocking method for an arsenic-containing waste residue storage yard by adopting the stabilizing agent; the stabilizing agent consists of 22Kg of Portland cement 42.5 (by dry weight mass), 3Kg of expanding agent, 15Kg of sodium bentonite powder with the particle size of 200 meshes, 22Kg of fine sand with the average particle size of 0.20mm, 40Kg of powdery clay with the particle size of 200 meshes, 4Kg of fly ash (class F second grade), 0.6Kg of ferrous sulfate heptahydrate and 0.4Kg of sodium sulfate; wherein the expanding agent is a sulphoaluminate expanding agent; the fly ash is low-calcium fly ash, and the content of calcium oxide in the low-calcium fly ash is not more than 46 wt%;
The blocking method for the arsenic-containing waste residue storage yard by adopting the stabilizing agent comprises the following steps as shown in figures 1 and 2:
(1) The hydrogeological survey result shows that rock mass at the bottom of the arsenic-containing waste residue storage yard is a highly weathered layer and is in a cracked structure, the rock mass is crushed, and the bottom of the arsenic-containing waste residue storage yard contains fracture water, so that impurities on the surface layer of the arsenic-containing waste residue storage yard are cleaned, and the working surface is leveled;
(2) Measuring and positioning by using a total station, and marking;
(3) installing, positioning and debugging a lead hole drilling machine;
(4) drilling a positioning part to form a grouting hole 1, and enabling the drilling hole to penetrate the arsenic-containing waste residue to a fracture bedrock;
(5) collecting and properly disposing the lead hole circulating slurry;
(6) checking a final hole, and transferring the geological drilling rig after the final hole is qualified; the high-pressure jet grouting pile machine is put in place, a drilling machine is started, drilling is carried out while rotating, and a drill rod is drilled to a fractured bedrock at the bottom of the arsenic-containing waste residue;
(7) Mixing the stabilizing agent and water according to a mass ratio of 1: 0.5, mixing to prepare slurry;
(8) injecting the slurry into arsenic-containing waste residues through a grouting hole, controlling the grouting pressure to be 30Mpa and the slurry flow rate to be 85L/min, injecting the slurry into the bottom of the arsenic residues, allowing the slurry to flow into and fill cracks 8 of crack bedrocks 7, forming a barrier layer 6 at the bottom, wherein the thickness of the barrier layer 6 is 30cm, the influence radius 3 is 0.8m, and a grouting overlapping part 4 exists between every two adjacent influence radii 3;
(9) Pulling out the pipe, after the grouting operation is finished, pulling out the grouting pipe, and marking the grouting point;
(10) moving the machine tool: moving the rotary spraying machine to the next hole site, wherein the hole site is laid in detail as shown in the figure, and the distance between grouting holes is 2 m;
(11) and cleaning machines, and after grouting construction is finished, cleaning a grouting pump, a nozzle, a slurry feeding pump and a slurry stirrer so as to avoid blockage.
By adopting the blocking method of the embodiment to inject the slurry into the bottom of the arsenic slag, the connection between the arsenic slag and the surrounding underground water is effectively cut off, firstly, the underground water can be effectively prevented from entering the stacking area of the arsenic slag, and the environmental risk caused by long-term soaking of the arsenic slag is avoided; secondly, preventing pollutants in the arsenic slag from diffusing to underground water through cracks in the form of leachate to cause environmental pollution; thirdly, avoiding ectopic disposal of arsenic slag and saving the cost of transportation and disposal.
Example 2
The embodiment provides a stabilizing agent and a blocking method for an arsenic-containing waste residue storage yard by adopting the stabilizing agent; the stabilizing agent consists of 18Kg of Portland cement 42.5 (by dry weight mass), 2Kg of expanding agent, 16Kg of sodium bentonite powder with the particle size of 150 meshes, 20Kg of fine sand with the average particle size of 0.25mm, 38Kg of 150-mesh powdery clay (soil nearby), 5Kg of fly ash (class F second grade), 0.5Kg of ferrous sulfate heptahydrate and 0.5Kg of sodium sulfate; wherein the swelling agent is calcium oxide swelling agent; the fly ash is low-calcium fly ash, and the content of calcium oxide in the low-calcium fly ash is not more than 46 wt%;
the blocking method for the arsenic-containing waste residue storage yard by adopting the stabilizing agent comprises the following steps as shown in figures 1 and 2:
(1) a certain arsenic-containing waste residue storage yard 5 is positioned in a certain mountain area, hydrogeological survey results show that the rock mass at the bottom of the arsenic residue storage yard is an intermediate weathered layer, investigation finds that the content of arsenic in surface water near the arsenic residue is higher, impurities on the surface layer of the arsenic-containing waste residue storage yard are cleaned, and the operation surface is leveled;
(2) measuring and positioning by using a total station, and marking;
(3) Installing, positioning and debugging a lead hole drilling machine;
(4) Drilling a positioning part to form a grouting hole 1, and enabling the drilling hole to penetrate the arsenic-containing waste residue to a fracture bedrock;
(5) Collecting and properly disposing the lead hole circulating slurry;
(6) Checking a final hole, and transferring the geological drilling rig after the final hole is qualified; the high-pressure jet grouting pile machine is put in place, a drilling machine is started, drilling is carried out while rotating, and a drill rod is drilled to a fractured bedrock at the bottom of the arsenic-containing waste residue;
(7) Mixing the stabilizing agent and water according to a mass ratio of 1: 0.5, mixing to prepare slurry;
(8) injecting the slurry into arsenic-containing waste residues through a grouting hole, controlling the grouting pressure to be 40Mpa and the slurry flow rate to be 70L/min, injecting the slurry into the bottom of the arsenic residues, allowing the slurry to flow into and fill cracks 8 of crack bedrocks 7, forming a barrier layer 6 at the bottom, wherein the thickness of the barrier layer 6 is 20cm, the influence radius 3 is 1.2m, and a grouting overlapping part 4 exists between every two adjacent influence radii 3;
(9) pulling out the pipe, after the grouting operation is finished, pulling out the grouting pipe, and marking the grouting point;
(10) moving the machine tool: moving the rotary spraying machine to the next hole site, wherein the hole site is laid in detail as shown in the figure, and the distance 2 between grouting holes is 0.86 m;
(11) and cleaning machines, and after grouting construction is finished, cleaning a grouting pump, a nozzle, a slurry feeding pump and a slurry stirrer so as to avoid blockage.
example 3
the embodiment provides a stabilizing agent and a blocking method for an arsenic-containing waste residue storage yard by adopting the stabilizing agent; the stabilizing agent consists of 15Kg of Portland cement 42.5 (by dry weight mass), 8Kg of expanding agent, 10Kg of sodium bentonite powder with the particle size of 150 meshes, 25Kg of fine sand with the average particle size of 0.12mm, 35Kg of 150-mesh powdery clay (soil nearby), 5Kg of fly ash (class F second grade), 0.1Kg of ferrous sulfate heptahydrate and 0.8Kg of sodium sulfate; wherein the expanding agent is a magnesium oxide expanding agent; the fly ash is low-calcium fly ash, and the content of calcium oxide in the low-calcium fly ash is not more than 46 wt%;
the blocking method for the arsenic-containing waste residue storage yard by adopting the stabilizing agent comprises the following steps as shown in figures 1 and 2:
(1) a certain arsenic-containing waste residue storage yard 5 is positioned in a certain mountain area, hydrogeological survey results show that the rock mass at the bottom of the arsenic residue storage yard is an intermediate weathered layer, investigation finds that the content of arsenic in surface water near the arsenic residue is higher, impurities on the surface layer of the arsenic-containing waste residue storage yard are cleaned, and the operation surface is leveled;
(2) measuring and positioning by using a total station, and marking;
(3) installing, positioning and debugging a lead hole drilling machine;
(4) Drilling a positioning part to form a grouting hole 1, and enabling the drilling hole to penetrate the arsenic-containing waste residue to a fracture bedrock;
(5) collecting and properly disposing the lead hole circulating slurry;
(6) Checking a final hole, and transferring the geological drilling rig after the final hole is qualified; the high-pressure jet grouting pile machine is put in place, a drilling machine is started, drilling is carried out while rotating, and a drill rod is drilled to a fractured bedrock at the bottom of the arsenic-containing waste residue;
(7) Mixing the stabilizing agent and water according to a mass ratio of 1: 0.25, mixing to prepare slurry;
(8) injecting the slurry into arsenic-containing waste residues through a grouting hole, controlling the grouting pressure to be 20Mpa and the slurry flow rate to be 100L/min, injecting the slurry into the bottom of the arsenic residues, allowing the slurry to flow into and fill cracks 8 of crack bedrocks 7, forming a barrier layer 6 at the bottom, wherein the thickness of the barrier layer 6 is 40cm, the influence radius 3 is 2m, and a grouting overlapping part 4 exists between every two adjacent influence radii 3;
(9) pulling out the pipe, after the grouting operation is finished, pulling out the grouting pipe, and marking the grouting point;
(10) Moving the machine tool: moving the rotary spraying machine to the next hole site, wherein the hole site is laid in detail as shown in the figure, and the distance between grouting holes is 3.4 m;
(11) and cleaning machines, and after grouting construction is finished, cleaning a grouting pump, a nozzle, a slurry feeding pump and a slurry stirrer so as to avoid blockage.
example 4
the embodiment provides a stabilizing agent and a blocking method for an arsenic-containing waste residue storage yard by adopting the stabilizing agent; the stabilizing agent consists of 25Kg of Portland cement 42.5 (by dry weight mass), 3Kg of expanding agent, 25Kg of sodium bentonite powder with the particle size of 250 meshes, 15Kg of fine sand with the average particle size of 0.23mm, 65Kg of 150 mesh powdery clay (soil nearby), 1Kg of fly ash (class F second grade), 1Kg of ferrous sulfate heptahydrate and 0.2Kg of sodium sulfate; wherein the expanding agent is a magnesium oxide expanding agent; the fly ash is low-calcium fly ash, and the content of calcium oxide in the low-calcium fly ash is not more than 46 wt%;
The blocking method for the arsenic-containing waste residue storage yard by adopting the stabilizing agent comprises the following steps as shown in figures 1 and 2:
(1) A certain arsenic-containing waste residue storage yard 5 is positioned in a certain mountain area, hydrogeological survey results show that the rock mass at the bottom of the arsenic residue storage yard is an intermediate weathered layer, investigation finds that the content of arsenic in surface water near the arsenic residue is higher, impurities on the surface layer of the arsenic-containing waste residue storage yard are cleaned, and the operation surface is leveled;
(2) measuring and positioning by using a total station, and marking;
(3) installing, positioning and debugging a lead hole drilling machine;
(4) Drilling a positioning part to form a grouting hole 1, and enabling the drilling hole to penetrate the arsenic-containing waste residue to a fracture bedrock;
(5) Collecting and properly disposing the lead hole circulating slurry;
(6) Checking a final hole, and transferring the geological drilling rig after the final hole is qualified; the high-pressure jet grouting pile machine is put in place, a drilling machine is started, drilling is carried out while rotating, and a drill rod is drilled to a fractured bedrock at the bottom of the arsenic-containing waste residue;
(7) Mixing the stabilizing agent and water according to a mass ratio of 1: 0.20, mixing to prepare slurry;
(8) injecting the slurry into arsenic-containing waste residues through a grouting hole, controlling the grouting pressure to be 25Mpa and the slurry flow rate to be 90L/min, injecting the slurry into the bottom of the arsenic residues, allowing the slurry to flow into and fill cracks 8 of crack bedrocks 7, forming a barrier layer 6 at the bottom, wherein the thickness of the barrier layer 6 is 32cm, the influence radius 3 is 0.9m, and a grouting overlapping part 4 exists between every two adjacent influence radii 3;
(9) pulling out the pipe, after the grouting operation is finished, pulling out the grouting pipe, and marking the grouting point;
(10) Moving the machine tool: moving the rotary spraying machine to the next hole site, wherein the hole site is laid in detail as shown in the figure, and the distance 2 between grouting holes is 2.1 m;
(11) And cleaning machines, and after grouting construction is finished, cleaning a grouting pump, a nozzle, a slurry feeding pump and a slurry stirrer so as to avoid blockage.
test example 1
the performance of the barrier layers formed in examples 1-4 above was tested as follows, and the slump test method was in accordance with the general concrete mixture Performance test method (GBJ 8-85); the testing method of the compressive strength is a rebound method; the method for testing the permeability coefficient is a variable water head test method; the corresponding test results are shown in table 1 below:
TABLE 1
| slump (mm) | Compressive strength (Mpa)7d | Permeability coefficient (cm/s)7d | |
| example 1 | 238 | 2.8 | 1.2×10-8 |
| example 2 | 221 | 2.6 | 2.5×10-8 |
| Example 3 | 232 | 2.8 | 2.1×10-8 |
| example 4 | 226 | 2.7 | 1.9×10-8 |
test example 2
the blocking method in the above examples 1 to 4 was used to block the arsenic-containing waste dump, and after 6 months of blocking time, the arsenic content in the groundwater below the corresponding arsenic-containing waste dump was measured, and the corresponding test results are shown in table 2 below:
TABLE 2
| arsenic content in ground water | |
| example 1 | ≤0.05mg/L |
| example 2 | ≤0.05mg/L |
| example 3 | ≤0.05mg/L |
| Example 4 | ≤0.05mg/L |
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. a stabilizing agent comprises the following raw materials in parts by weight:
2. The stabilizing agent of claim 1, wherein the iron-containing material is at least one of an iron (hydr) oxide ore, an iron salt, zero-valent iron, or an iron-containing industrial byproduct;
The sulfate is sodium sulfate and/or potassium sulfate.
3. The stabilized pharmaceutical preparation according to claim 1 or 2, further comprising 2 to 8 parts by weight of a swelling agent.
4. The stabilizing agent according to claim 3, wherein the swelling agent is at least one of a sulphoaluminate swelling agent, a calcium oxide swelling agent, and a magnesium oxide swelling agent;
the cement is portland cement.
5. The stabilizing agent as claimed in any one of claims 1 to 4, wherein the bentonite is sodium bentonite, and the particle size of the sodium bentonite is 150-250 mesh;
The particle size of the clay is 150-250 meshes.
6. The stabilizing agent according to any one of claims 1 to 5, wherein the sand is fine sand having an average particle diameter of 0.12mm to 0.25 mm;
the fly ash is low-calcium fly ash, and the content of calcium oxide in the low-calcium fly ash is not more than 46 wt%.
7. a blocking method for an arsenic-containing waste residue storage yard comprises the following steps:
positioning the arsenic-containing waste residue storage yard, punching a hole at the positioning position to form a grouting hole, and leading the hole to penetrate the arsenic-containing waste residue to a fractured bedrock;
mixing the stabilizing agent of any one of claims 1-5 with water to produce a slurry;
And injecting the slurry into the arsenic-containing waste residues through the grouting holes, filling the cracks of the fractured bedrock, and forming a barrier layer on the interface of the arsenic-containing waste residues and the fractured bedrock.
8. the blocking method according to claim 7, wherein the hole pitch of adjacent grouting holes is 0.86m to 3.4 m;
the mass ratio of the stabilizing agent to water is 1: (0.25-0.5).
9. A barrier method as claimed in claim 7 or 8, wherein the slurry is injected at a pressure of 20Mpa to 40 Mpa;
The flow rate of the slurry is 70-100L/min, and the influence radius is 0.5-2 m.
10. the barrier method according to any one of claims 7 to 9, wherein the barrier layer has a thickness of 20cm to 40 cm.
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