CN108751872B - Curing agent for treating inorganic distillation residues rich in chloride - Google Patents
Curing agent for treating inorganic distillation residues rich in chloride Download PDFInfo
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- CN108751872B CN108751872B CN201810862574.8A CN201810862574A CN108751872B CN 108751872 B CN108751872 B CN 108751872B CN 201810862574 A CN201810862574 A CN 201810862574A CN 108751872 B CN108751872 B CN 108751872B
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- curing agent
- inorganic
- distillation residues
- chloride
- curing
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- 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
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- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
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- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic 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 relates to a curing agent for treating dangerous solid waste, in particular to a curing agent for treating inorganic distillation residues rich in chloride, which comprises the following components in percentage by mass: 23-48% of water leakage-free, 10-35% of kaolin, 10-32% of cement and 3-10% of industrial incineration fly ash. The curing agent is simple to prepare, low in cost investment and good in curing effect, and compared with the prior art, the curing agent has the advantages that the curing rate of chloride ions in solid waste is much higher, the efficiency is higher, the curing is more stable, and the pollution of inorganic distillation residues to the environment is greatly reduced.
Description
Technical Field
The invention belongs to the field of hazardous solid waste treatment, and particularly relates to a curing agent for treating inorganic distillation residues rich in chloride.
Background
With the rapid development of economy, a large amount of hazardous waste, namely inorganic distillation residues, are generated in the industrial production process, the main components of the hazardous waste are various inorganic salts such as sodium chloride, potassium chloride, sodium sulfate, potassium sulfate and the like, and the inorganic distillation residues containing chloride have strong solubility and stability, complex components and high treatment difficulty. As is known, chloride ions can damage a passive film on the surface of a steel bar to accelerate corrosion reaction, so that the service life and safety of concrete are further reduced, and the destructiveness is extremely high. Therefore, how to efficiently dispose of the inorganic residues is a big problem in the current environmental protection industry.
In the field of hazardous waste disposal, the conventional treatment method mainly comprises comprehensive recycling and stabilized landfill, and the recycling is difficult to be widely applied in actual production due to high cost and high difficulty; the stabilized landfill is a preferred disposal method for a plurality of current environment-friendly enterprises, and is safely buried after stabilized disposal by adding curing agents such as lime, gypsum and the like. However, the overall solidification effect is not ideal, the solidification rate is about 30-50%, after the solidified body enters a hazardous waste landfill, salts which do not reach effective solidification can be gradually dissolved along with the increase of the water level of leachate, great potential safety hazards are caused to the landfill, and even collapse can be caused, so that the solidification rate of soluble salts in inorganic distillation residues is improved, and the reduction of salt leaching is a necessary condition for stable operation of the landfill.
Disclosure of Invention
The invention aims to provide a curing agent for treating inorganic distillation residues rich in chloride, which is simple to prepare, low in cost investment and good in curing effect.
In order to achieve the purpose, the invention adopts the technical scheme that: a curing agent for treating inorganic distillation residues rich in chloride comprises the following components in percentage by mass: 23-48% of water leakage-free, 10-35% of kaolin, 10-32% of cement and 3-10% of industrial incineration fly ash.
According to the technical scheme, the treatment effect can be divided into three stages: firstly, calcium salt and aluminum salt contained in cement, kaolin and industrial incineration fly ash can chemically react with chloride ions in inorganic distillation residues to generate complex salt stable unit cells such as aluminum calcium chlorate, sulfur aluminum chloride calcium sulfate and the like, so that ions in the salt are prevented from being transported in a solution, precipitation is reduced, and the chloride ions are effectively solidified; secondly, the mixture is wholly in a gel state substance consisting of colloid particles through the reaction, water cannot leak and the colloid particles are quickly wrapped and reacted, wherein the water cannot leak is the moistureproof and anti-permeability plugging material taking high-iron sulphoaluminate and silicon dioxide as main components, and the high-iron sulphoaluminate has a strong condensation effect, so that a cured substance is not easy to dissolve; thirdly, kaolinite, which is a main component of kaolin, belongs to a 1: 1 type layered silicate, and crystals thereof mainly consist of silicon-oxygen tetrahedrons and aluminous octahedrons, wherein the silicon-oxygen tetrahedrons are linked in a two-dimensional direction in a manner of sharing a vertex angle to form a hexagonal grid layer, tip oxygen not shared by the silicon-oxygen tetrahedrons faces to one side, and a 1: 1 type unit layer is composed of tip oxygen shared by the silicon-oxygen tetrahedron layer and the aluminous octahedron layer, so that the kaolinite has the performance of adsorbing various ions and impurities from a surrounding medium, and the action effect of a curing agent is further increased. Compared with the prior art, the curing agent has higher curing rate on chloride ions in the inorganic distillation residues, higher efficiency and more stability after curing, and greatly lightens the pollution of the inorganic distillation residues to the environment.
As a preferable scheme, the curing agent further comprises at least one of waste ceramic ball powder, zeolite and sodium metaaluminate, and the specific scheme is that the waste ceramic ball powder comprises 5-12% of waste ceramic ball powder, 2-8% of zeolite and 3-10% of sodium metaaluminate by mass percentage. Sodium metaaluminate is used as coagulant, which can accelerate the hardening of the solidified product and greatly shorten the setting time. The ceramic ball powder is a commonly used filter material in the chemical industry, and is waste ceramic ball powder after being used until being incapable of being regenerated. The waste porcelain ball powder contains a large amount of oxides of aluminum and silicon, and can react with ions in inorganic distillation residues after meeting water to form a gel-state stable compound to prevent the leaching of solidified ions.
Zeolite is an inorganic active material, the framework of the zeolite contains pore channels and cavities capable of exchanging cations, and metal cations can be positioned among the pore channels or the cavities which have larger crystal structures and are mutually communicated, so that the curing agent has stronger adsorbability and exchange capacity, for example, the sodium ions are exchanged into crystal cells to stably exist, and the calcium ions are changed into insoluble substances such as calcium sulfate, calcium hydroxide, calcium chloroaluminate and the like, thereby reducing the content of soluble salts.
Preferably, the zeolite is replaced by vermiculite and the sodium metaaluminate is replaced by ferric sulphate. Vermiculite, as a silicate mineral with a monoclinic crystal structure, also has ion exchange capacity and can be used to replace sodium ions to be exchanged into stable unit cells and solidified after zeolite is added, so that the content of soluble salts is reduced.
When ferric sulfate is added to the inorganic distillation residue instead of sodium metaaluminate, colloid particles in gel substances generated by the reaction of cement, kaolin and the like with chloride ions in the inorganic distillation residue have negative charges, and after the ferric sulfate is dissolved in water, the charges of positive ferric ions are just opposite to those of the colloid particles in the gel, so that the substances formed by combining the ferric sulfate and the gel are more stable and the curing speed is higher.
Preferably, the use method of the curing agent is as follows: mixing the prepared curing agent with the inorganic distillation residues to be treated, adding water, stirring uniformly, and burying after the mixture is hardened. When in use, the dosage of the curing agent accounts for 44-56% of the total mass and the water addition amount accounts for (20 +/-5)% of the total mass according to 100% of the total mass of the curing agent and the inorganic distillation residues.
The technical scheme of the invention has the advantages of low cost of raw materials, simple preparation and convenient use, the curing rate of the chloride in the inorganic distillation residues can reach more than 75 percent, even 80 percent, the cured waste has certain strength which can reach more than 150KPa, and the cured waste after landfill is not easy to be crushed under pressure to cause the reduction of the curing effect. Compared with the prior art, the technical scheme of the invention better meets the new requirements of environmental management and ecological protection.
Detailed Description
The curing agent of the present invention is described in detail by a series of examples.
Examples 1 to 13 were carried out as follows: the relevant data are detailed in table 1.
Preparing a curing agent: the curing agent was prepared according to the ratio of the components of the curing agent in each example in table 1, and the inorganic distillation residue was treated. Wherein, the water leakage-proof is purchased by Shandong Jinliushun building materials Co Ltd; the cement is conch brand 32.5 portland cement.
Inorganic distillation residue: inorganic distillation residue of a certain manufacturer has the water content of about 14 percent and the main component of sodium chloride, and according to the standard requirements of ' gravimetric method for measuring total salt content of water HJ/T51-1999 ', ' silver nitrate titration method for measuring chloride in water GB11896-89 and ' GB.T 50081-2002 common concrete mechanical property test method standard ', the TDS of the leachate is measured to be 78900mg/L, and chloride ions Cl are measured-Is 33980 mg/L.
The implementation process comprises the following steps: placing 50g of inorganic distillation residues in a beaker, adding the prepared curing agent according to the dosage of the curing agent in the table 1, uniformly stirring, adding tap water accounting for 20 +/-5 percent of the total mass of the mixture, uniformly stirring, and measuring the TDS value and Cl value of the leachate of the curing mixture by the same method after the mixture is hardened-Content, calculated cure rate, and the data obtained are detailed in table 1.
The compressive strength of the solid obtained after curing in each example is more than 150Kpa, and the solid has higher compressive strength and water stability.
As can be seen from the data related to the examples recorded in Table 1, the curing agent obtained by the scheme of the invention has a remarkable curing effect on inorganic distillation residues rich in chloride, and the curing rate can reach 75-80%.
Claims (6)
1. A curing agent for treating chloride-rich inorganic distillation residues, characterized in that: the curing agent comprises the following components in percentage by mass: 23-48% of water leakage-free, 10-35% of kaolin, 10-32% of cement and 3-10% of industrial incineration fly ash; also comprises 5 to 12 percent of waste porcelain ball powder, 2 to 8 percent of zeolite and 3 to 10 percent of sodium metaaluminate.
2. The curing agent for treating chloride-rich inorganic distillation residues according to claim 1, characterized in that: the zeolite is replaced by vermiculite.
3. The curing agent for treating chloride-rich inorganic distillation residues according to claim 1 or 2, characterized in that: the sodium metaaluminate is replaced by ferric sulfate.
4. The curing agent for treating chloride-rich inorganic distillation residues according to claim 1, characterized in that: the water leakage-proof leak-stopping material is a moisture-proof and anti-permeability leak-stopping material taking high-iron sulphoaluminate and silicon dioxide as main components.
5. A method of using the curing agent of any of claims 1 to 4: mixing the prepared curing agent with the inorganic distillation residues to be treated, adding water, stirring uniformly, and burying after the mixture is hardened.
6. The method for using the curing agent according to claim 5, wherein: when the curing agent is used, the dosage of the curing agent accounts for 44-56% of the total mass and the water addition amount accounts for (20 +/-5)% of the total mass according to 100% of the total mass of the curing agent and the inorganic distillation residues.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810862574.8A CN108751872B (en) | 2018-08-01 | 2018-08-01 | Curing agent for treating inorganic distillation residues rich in chloride |
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| CN201810862574.8A CN108751872B (en) | 2018-08-01 | 2018-08-01 | Curing agent for treating inorganic distillation residues rich in chloride |
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| CN108751872A CN108751872A (en) | 2018-11-06 |
| CN108751872B true CN108751872B (en) | 2020-11-24 |
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| CN112479618A (en) * | 2020-12-11 | 2021-03-12 | 安徽浩悦环境科技有限责任公司 | Industrial waste salt slag curing agent and curing method |
| CN113695361B (en) * | 2021-08-31 | 2023-04-07 | 西南科技大学 | Chlorine-containing titanium extraction slag, chloride ion curing method thereof and method for preparing engineering material |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239792A (en) * | 2008-03-12 | 2008-08-13 | 中南大学 | Additive for increasing cement-base material solidifying dissociative chlorine ion capability and applying method thereof |
| CN105217925A (en) * | 2015-10-12 | 2016-01-06 | 北京高能时代环境技术股份有限公司 | Solidifying agent of a kind of sludge in-situ solidification and stabilization and its preparation method and application |
| CN106380099A (en) * | 2016-11-29 | 2017-02-08 | 北京宝辰联合科技有限公司 | Chloride ion adsorption agent for reinforced concrete structure and preparation method thereof |
| CN106377867A (en) * | 2016-08-22 | 2017-02-08 | 武汉都市环保工程技术股份有限公司 | Curing agent and curing method for heavy metals in fly ash from mswi (municipal solid waste incineration) |
| CN108129051A (en) * | 2017-12-29 | 2018-06-08 | 江苏苏博特新材料股份有限公司 | A kind of long-term efficiently concrete admixture of curing of chloride ion and application |
-
2018
- 2018-08-01 CN CN201810862574.8A patent/CN108751872B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239792A (en) * | 2008-03-12 | 2008-08-13 | 中南大学 | Additive for increasing cement-base material solidifying dissociative chlorine ion capability and applying method thereof |
| CN105217925A (en) * | 2015-10-12 | 2016-01-06 | 北京高能时代环境技术股份有限公司 | Solidifying agent of a kind of sludge in-situ solidification and stabilization and its preparation method and application |
| CN106377867A (en) * | 2016-08-22 | 2017-02-08 | 武汉都市环保工程技术股份有限公司 | Curing agent and curing method for heavy metals in fly ash from mswi (municipal solid waste incineration) |
| CN106380099A (en) * | 2016-11-29 | 2017-02-08 | 北京宝辰联合科技有限公司 | Chloride ion adsorption agent for reinforced concrete structure and preparation method thereof |
| CN108129051A (en) * | 2017-12-29 | 2018-06-08 | 江苏苏博特新材料股份有限公司 | A kind of long-term efficiently concrete admixture of curing of chloride ion and application |
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| CN108751872A (en) | 2018-11-06 |
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Address after: 231100 Wushan Town, Changfeng County, Hefei City, Anhui Province Patentee after: Anhui Haoyue Environmental Technology Co.,Ltd. Address before: 231145 Jinggang village, Wushan Town, Changfeng County, Hefei City, Anhui Province Patentee before: ANHUI HAO YUE ENVIRONMENTAL TECHNOLOGY Co.,Ltd. |