CN112194391A - High-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste - Google Patents
High-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste Download PDFInfo
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- CN112194391A CN112194391A CN202010974448.9A CN202010974448A CN112194391A CN 112194391 A CN112194391 A CN 112194391A CN 202010974448 A CN202010974448 A CN 202010974448A CN 112194391 A CN112194391 A CN 112194391A
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- coal
- bottom mud
- solid waste
- based solid
- water
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- 239000003245 coal Substances 0.000 title claims abstract description 51
- 239000002910 solid waste Substances 0.000 title claims abstract description 35
- 239000000463 material Substances 0.000 title claims abstract description 21
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 19
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 39
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 17
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 12
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000292 calcium oxide Substances 0.000 claims abstract description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000012190 activator Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 229910021645 metal ion Inorganic materials 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 3
- 229920000876 geopolymer Polymers 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 description 1
- -1 aluminum ions Chemical class 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
-
- 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- C04B2111/00784—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes for disposal only
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a high-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste, which comprises coal-based solid waste powder, calcium oxide, a composite activator and water; the composite excitant comprises: the water glass and the potassium hydroxide, wherein the modulus of the water glass is between 1 and 1.05, and the mass ratio of the water glass to the potassium hydroxide is 4: 1. The raw materials of the invention are solid wastes, the price is low, and the sources are wide; the method not only consumes the coal-based solid waste, reduces the national cost for treating the coal-based solid waste, but also reduces occupied land resources, and has good environmental protection benefit. The method can effectively solidify the bottom mud polluted by heavy metal, simultaneously reduce the activity of the heavy metal in the bottom mud, make the solidified bottom mud harmless and can be recycled.
Description
Technical Field
The invention relates to the field of coal-based solid waste recycling and heavy metal pollution remediation, in particular to a product generated by a series of measures such as screening, crushing, grinding and modifying coal-based solid wastes such as coal gangue and fly ash.
Background
The coal-based solid waste refers to solid waste generated in the development and utilization processes of coal such as coal gangue, coal ash, desulfurized gypsum, coal chemical industry waste residue and the like. At present, the utilization rate of coal-based solid wastes in China is low, and most of the coal-based solid wastes are accumulated. The accumulated coal-based solid waste occupies a large amount of land resources, and the coal-based solid waste contains abundant metals, inorganic salts and sulfides, so that a large amount of pollution can be caused after the coal-based solid waste is washed by rainwater.
The bottom sludge contains a large amount of heavy metal pollution and cannot be used for agricultural production, and the bottom sludge can release pollutants adsorbed by the bottom sludge again under certain conditions to cause secondary pollution.
Disclosure of Invention
The invention aims to overcome the problems and provide a high-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste. In order to achieve the purpose, the invention adopts the following technical scheme:
the high-efficiency curing material for the heavy metal polluted bottom mud prepared based on the coal-based solid waste comprises coal-based solid waste powder, calcium oxide, a composite activator and water, wherein the composite activator comprises: the water glass and the potassium hydroxide, wherein the modulus of the water glass is between 1 and 1.05, and the mass ratio of the water glass to the potassium hydroxide is 4: 1.
The invention also discloses a method for preparing the high-efficiency heavy metal polluted bottom mud curing material based on the coal-based solid waste to cure the bottom mud, which comprises the following steps:
s1, calcining the coal gangue at the temperature of 600-;
s2, cooling, crushing and grinding the calcined coal gangue to 300 meshes;
s3, preparing a composite excitant;
and S4, adding water into the bottom mud, the coal gangue powder, the composite exciting agent and the calcium oxide, uniformly mixing, and injecting into a mold for molding.
As a modification, the amount of water added in S4 was adjusted so that the mass of water was 46% of the total mass.
As an improvement, the composite excitant accounts for 40% of the total solid mass.
The invention has the advantages that:
1. economic benefits are as follows: the raw material is solid waste, the price is low, and the source is wide.
2. Environmental protection benefit: the method not only consumes the coal-based solid waste, reduces the national cost for treating the coal-based solid waste, but also reduces occupied land resources, and has obvious environmental protection benefit.
3. The practicability is as follows: the method can solidify the heavy metal polluted bottom sediment, reduce the activity of the heavy metal in the bottom sediment, make the solidified bottom sediment harmless, and can be recycled.
Detailed Description
The present invention will be described in detail and specifically with reference to the following examples so as to facilitate the understanding of the present invention, but the following examples do not limit the scope of the present invention.
Example 1
The embodiment discloses a high-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste, and a method for curing the bottom mud by using the high-efficiency curing material.
The curing material comprises: coal-based solid waste powder, calcium oxide, a composite excitant and water. Wherein the composite excitant is water glass and potassium hydroxide, the modulus of the water glass is 1.03, and the mass ratio of the water glass to the potassium hydroxide is 4: 1.
The method for solidifying the cement by the solidifying material comprises the following steps:
s1, calcining coal gangue at 800 ℃ for 2 hours;
s2, cooling, crushing and grinding the calcined coal gangue to 300 meshes to obtain coal gangue powder;
s3, weighing 172.8g of water glass and 43.2g of potassium hydroxide, and preparing a composite excitant;
s4, mixing and uniformly stirring 400g of bottom mud with the water content of 50%, 100g of coal gangue powder, 24g of calcium oxide, 216g of composite exciting agent and 260g of water, and then injecting the mixture into a mold for molding.
The main principle of the invention is the alkali excitation theory of the silicon-aluminum material, the coal-based solid waste has potential activity as other silicon-aluminum materials, the activity of the coal-based solid waste can be fully excited to form geopolymer by adding the alkali exciting agent, and the principle is mainly divided into the following 4 stages:
(1) dissolving aluminosilicate mineral powder raw material in alkaline solution (taking NaOH and KOH as examples);
(2) the dissolved aluminum-silicon complex diffuses from the surface of solid particles to the gaps among the particles;
(3) gel phase Mn { - (SiO)2)z-AlO2}n·wH2The formation of O, which leads to polymerization between the alkali silicate solution and the aluminium-silicon complex;
(4) the gel phase gradually excludes the remaining water, consolidates and hardens into a geopolymeric mass, and encapsulates other components therein, hardening the whole.
The structure of geopolymers is a "crystal-like" structure composed of cyclic molecular chains. The ring-shaped molecules are combined to form a closed cavity (cage shape), so that metal ions and other toxic substances can be divided and enclosed in the cavity; meanwhile, aluminum ions in the framework can also adsorb metal ions; and the metal ions also participate in the formation of the geopolymer structure, so that the metal ions in the system can be more effectively fixed.
Example 2
The embodiment discloses a high-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste, and a method for curing the bottom mud by using the high-efficiency curing material.
The curing material comprises: coal-based solid waste powder, calcium oxide, a composite excitant and water. Wherein the composite excitant is water glass and potassium hydroxide, the modulus of the water glass is 1.03, and the mass ratio of the water glass to the potassium hydroxide is 4: 1.
The method for solidifying the cement by the solidifying material comprises the following steps:
s1, calcining coal gangue at 800 ℃ for 2 hours;
s2, cooling, crushing and grinding the calcined coal gangue to 300 meshes to obtain coal gangue powder;
s3, weighing 172.8g of water glass and 43.2g of potassium hydroxide, and preparing a composite excitant;
s4, mixing 500g of bottom mud with the water content of 60%, 100g of coal gangue powder, 24g of calcium oxide, 216g of composite exciting agent and 160g of water, uniformly stirring, and injecting into a mold for molding.
The embodiments of the present invention have been described in detail above, but they are merely exemplary, and the present invention is not equivalent to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, it is intended that all equivalent alterations and modifications be included within the scope of the invention, without departing from the spirit and scope of the invention.
Claims (5)
1. The high-efficiency curing material for the heavy metal polluted bottom mud prepared based on the coal-based solid waste is characterized by comprising coal-based solid waste powder, calcium oxide, a composite exciting agent and water;
the composite excitant comprises: the water glass and the potassium hydroxide, wherein the modulus of the water glass is between 1 and 1.05, and the mass ratio of the water glass to the potassium hydroxide is 4: 1.
2. The method for solidifying the bottom mud by using the high-efficiency solidifying material for the heavy metal polluted bottom mud prepared on the basis of the coal-based solid waste as set forth in the claim 1 is characterized by comprising the following steps of:
s1, calcining the coal gangue at the temperature of 600-;
s2, cooling, crushing and grinding the calcined coal gangue;
s3, preparing a composite excitant;
and S4, adding water into the bottom mud, the coal gangue powder, the composite exciting agent and the calcium oxide, uniformly mixing, and injecting into a mold for molding.
3. The method for solidifying the bottom mud by using the high-efficiency solidifying material of the bottom mud polluted by the heavy metals prepared from the coal-based solid waste is characterized in that the adding amount of water in S4 is adjusted according to the water content of the bottom mud, so that the water accounts for 46% of the total mass.
4. The method for solidifying the bottom mud by using the high-efficiency solidifying material for the bottom mud polluted by the heavy metals prepared from the coal-based solid wastes, as claimed in claim 2, wherein the composite excitant accounts for 40% of the total solid mass.
5. The method for solidifying the bottom mud based on the high-efficiency solidifying material of the bottom mud polluted by the heavy metals prepared from the coal-based solid wastes, as claimed in claim 2, wherein the milling in the step S2 is to mill the coal gangue into 300 meshes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010974448.9A CN112194391A (en) | 2020-09-16 | 2020-09-16 | High-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010974448.9A CN112194391A (en) | 2020-09-16 | 2020-09-16 | High-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112194391A true CN112194391A (en) | 2021-01-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010974448.9A Pending CN112194391A (en) | 2020-09-16 | 2020-09-16 | High-efficiency curing material for heavy metal polluted bottom mud prepared based on coal-based solid waste |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112194391A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115215519A (en) * | 2022-07-19 | 2022-10-21 | 常熟理工学院 | Detoxification method of thallium-polluted river sediment |
| CN115259755A (en) * | 2022-07-14 | 2022-11-01 | 江苏地质矿产设计研究院(中国煤炭地质总局检测中心) | Self-combustion gangue baking brick and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012111A (en) * | 2007-02-05 | 2007-08-08 | 徐宇晴 | Method of preparing geopolymer material |
| CN101259314A (en) * | 2008-04-22 | 2008-09-10 | 南京瑞迪高新技术公司 | Method for curing heavy metal and its special-purpose base soil polymer |
| US20150016895A1 (en) * | 2013-07-11 | 2015-01-15 | Universiti Malaysia Perlis | Geopolymerization method for soil stabilization application |
| CN104355575A (en) * | 2014-10-22 | 2015-02-18 | 浙江工业职业技术学院 | Fly ash and dyeing sludge geopolymer material and preparing method thereof |
| CN107500580A (en) * | 2017-09-26 | 2017-12-22 | 深圳大学 | A kind of method for realizing that heavy metal is efficiently fixed in sludge incineration residue by preparing geo-polymer |
| CN110282956A (en) * | 2019-07-09 | 2019-09-27 | 上海环境保护有限公司 | A kind of method that river bottom mud solidifies brickmaking resource utilization |
-
2020
- 2020-09-16 CN CN202010974448.9A patent/CN112194391A/en active Pending
Patent Citations (6)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115259755A (en) * | 2022-07-14 | 2022-11-01 | 江苏地质矿产设计研究院(中国煤炭地质总局检测中心) | Self-combustion gangue baking brick and preparation method thereof |
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| CN115215519B (en) * | 2022-07-19 | 2023-12-01 | 常熟理工学院 | Detoxification method of thallium-polluted river sediment |
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Application publication date: 20210108 |