CN111922027A - Stabilization and solidification method and application of inorganic fluoride landfill waste - Google Patents
Stabilization and solidification method and application of inorganic fluoride landfill waste Download PDFInfo
- Publication number
- CN111922027A CN111922027A CN202010559961.1A CN202010559961A CN111922027A CN 111922027 A CN111922027 A CN 111922027A CN 202010559961 A CN202010559961 A CN 202010559961A CN 111922027 A CN111922027 A CN 111922027A
- Authority
- CN
- China
- Prior art keywords
- landfill
- mixture
- hazardous waste
- inorganic fluoride
- waste
- 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.)
- Pending
Links
- 229910001506 inorganic fluoride Inorganic materials 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000002699 waste material Substances 0.000 title claims abstract description 18
- 238000007711 solidification Methods 0.000 title claims abstract description 15
- 230000008023 solidification Effects 0.000 title claims abstract description 15
- 230000006641 stabilisation Effects 0.000 title abstract description 9
- 238000011105 stabilization Methods 0.000 title abstract description 9
- 239000002920 hazardous waste Substances 0.000 claims abstract description 42
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 13
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 13
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 11
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 9
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 9
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 9
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 42
- 238000001723 curing Methods 0.000 claims description 24
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 9
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 9
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 13
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 2
- 231100000331 toxic Toxicity 0.000 description 7
- 230000002588 toxic effect Effects 0.000 description 7
- 229910052731 fluorine Inorganic materials 0.000 description 5
- 239000011737 fluorine Substances 0.000 description 5
- -1 fluorine ions Chemical class 0.000 description 4
- 238000002386 leaching Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 206010016818 Fluorosis Diseases 0.000 description 1
- 208000014735 Tooth injury Diseases 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 208000004042 dental fluorosis Diseases 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/20—Agglomeration, binding or encapsulation of solid waste
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B1/00—Dumping solid waste
Abstract
The invention relates to a stabilization and solidification method of inorganic fluoride landfill hazardous waste and application thereof, belonging to the field of stabilization and solidification of solid waste. The method for stabilizing and solidifying inorganic fluoride hazardous waste comprises the following steps: adding a calcium chloride solution into the hazardous waste after the crushing treatment; adding cement or hydrated lime, uniformly mixing and solidifying; adding phosphoric acid solution to adjust the pH value; and after maintenance, the materials meet the entrance standard of the landfill dangerous wastes, and then the materials can be put into the field for landfill treatment. The invention can be applied to the stabilization and solidification of inorganic fluoride hazardous waste, does not cause unqualified pH value due to excessive addition of the curing agent, and has the advantages of good solidification effect, high stability, wide application range and the like.
Description
Technical Field
The invention relates to the field of solid waste stabilization and solidification, in particular to a stabilization and solidification method and application of inorganic fluoride landfill waste.
Background
In the process of producing and disposing industrial wastewater containing fluorine, a large amount of dangerous waste containing inorganic fluoride, such as fluorine-containing sludge and the like, is generated, and if the dangerous waste cannot be properly disposed, fluorine ions in the dangerous waste are diffused into drinking water to cause fluorosis, so that the dangerous waste can cause serious injury to teeth, bones, nervous systems and the like of a human body.
In the hazardous waste disposal industry, the landfill hazardous waste with high inorganic fluoride content is generally disposed in a mode of solidifying firstly and then burying. Adding a proper amount of cement or hydrated lime for curing in the first step, curing the cured hazardous waste in the second step, and performing landfill treatment, wherein the leaching toxicity index of the hazardous waste after curing meets the hazardous waste landfill pollution control standard (GB18598-2019), and the content of inorganic fluoride (without calcium fluoride) is less than 120 ppm.
The method has a certain curing effect when treating the hazardous waste with low content of inorganic fluoride (the concentration of leached toxic inorganic fluoride is less than 500mg/L and no calcium fluoride), but for the hazardous waste with higher content of inorganic fluoride (the concentration of leached toxic inorganic fluoride is 1000-15000mg/L and no calcium fluoride), cement or hydrated lime is used for curing, a large amount of strong alkaline cement and hydrated lime are required to be added, so that the cost of the medicament is increased, the pH value of a cured body exceeds the standard, the leaching resistance of the cured hazardous waste is poor, the leached toxicity index is unqualified, and the disposal effect of the hazardous waste is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for stabilizing and curing inorganic fluoride landfill hazardous wastes, which has good curing effect and high stability.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for stabilizing and solidifying inorganic fluoride landfill hazardous wastes comprises the following steps:
(1) adding a calcium chloride solution into the crushed hazardous waste to obtain a mixture A;
(2) adding a curing agent into the mixture A to obtain a mixture B;
(3) adding a phosphoric acid solution to the mixture B to obtain a mixture C.
Preferably, the stabilizing and curing method further comprises the step (4): and after maintaining all indexes of the mixture C to meet the standard of landfill dangerous waste entering, performing landfill treatment.
The stabilized solidification method is used for treating inorganic fluoride (the concentration of leached toxic inorganic fluoride is 1000-15000mg/L, and calcium fluoride is not contained) landfill hazardous waste, so that the use amount of cement and hydrated lime in the traditional method can be reduced, the pH value of a solidified body can be adjusted, the stability of the solidified body is enhanced, and the requirement of the hazardous waste on entering a landfill site can be met.
Preferably, the particle size of the crushed hazardous waste is less than or equal to 60 mm.
After being crushed, the hazardous waste can be fully contacted with calcium chloride, curing agent, phosphoric acid and other components, so that the replacement rate of fluorine ions is improved.
Preferably, the weight part of the calcium chloride in the mixture A is 5-100 parts.
The addition of calcium chloride can lead the free fluoride ions in the hazardous waste to form calcium fluoride precipitate with low solubility through chemical precipitation.
Preferably, the weight part of the curing agent in the mixture B is 10-100 parts.
Preferably, the curing agent is cement or hydrated lime.
And the residual fluorine ions are cured in a wrapping manner by using cement and hydrated lime, so that the effect of the curing method is improved.
Preferably, the weight part of the phosphoric acid solution in the mixture C is 1-30 parts.
Preferably, the phosphoric acid solution contains 5% by mass of phosphoric acid.
The phosphoric acid solution can adjust the pH value of the solidified body on the premise of not influencing the stabilizing and solidifying effect, thereby enhancing the stability of the solidified body and being beneficial to the future maintenance and landfill.
Compared with the prior art, the invention has the beneficial effects that: the particle size, the stabilizing and curing effect and the pH value of the hazardous waste are comprehensively considered, and the stabilizing and curing method for the inorganic fluoride landfill hazardous waste is comprehensively considered, so that the inorganic fluoride landfill hazardous waste has the advantages of good fluorine-fixing effect, high stability, wide application range, no unqualified pH value caused by excessive addition of the curing agent and the like. And the method has unique advantages in the aspect of treating high-content inorganic fluoride landfill hazardous wastes, not only reduces the consumption of cement or hydrated lime and saves the production cost, but also ensures that the landfill body after the stabilization and solidification has better leaching resistance.
Detailed Description
In order to better illustrate the objects, technical solutions and advantages of the present invention, the present invention will be further described below by referring to examples.
Example 1:
a method for stabilizing and solidifying inorganic fluoride landfill hazardous wastes comprises the following steps:
(1) adding 5 parts by weight of a calcium chloride solution to the crushed hazardous waste to obtain a mixture A;
(2) adding 10 parts by weight of cement to the mixture A to obtain a mixture B;
(3) to the mixture B, 1 part by weight of a 5% phosphoric acid solution was added to obtain a mixture C.
(4) And after maintaining all indexes of the mixture C to meet the standard of landfill dangerous waste entering, performing landfill treatment.
Example 2:
a method for stabilizing and solidifying inorganic fluoride landfill hazardous wastes comprises the following steps:
(1) adding 10 parts by weight of a calcium chloride solution to the crushed hazardous waste to obtain a mixture A;
(2) adding 20 parts by weight of cement to the mixture A to obtain a mixture B;
(3) to the mixture B, 1 part by weight of a 5% phosphoric acid solution was added to obtain a mixture C.
(4) And after maintaining all indexes of the mixture C to meet the standard of landfill dangerous waste entering, performing landfill treatment.
Example 3:
a method for stabilizing and solidifying inorganic fluoride landfill hazardous wastes comprises the following steps:
(1) adding 60 parts by weight of a calcium chloride solution to the crushed hazardous waste to obtain a mixture A;
(2) adding 50 parts by weight of cement to the mixture A to obtain a mixture B;
(3) to the mixture B was added 12.5 parts by weight of a phosphoric acid solution to obtain a mixture C.
(4) And after maintaining all indexes of the mixture C to meet the standard of landfill dangerous waste entering, performing landfill treatment.
Example 4:
a method for stabilizing and solidifying inorganic fluoride landfill hazardous wastes comprises the following steps:
(1) adding 100 parts by weight of a calcium chloride solution to the crushed hazardous waste to obtain a mixture A;
(2) adding 100 parts by weight of cement to the mixture A to obtain a mixture B;
(3) to the mixture B was added 30 parts by weight of a 5% phosphoric acid solution to obtain a mixture C.
(4) And after maintaining all indexes of the mixture C to meet the standard of landfill dangerous waste entering, performing landfill treatment.
Effect example 1:
the sludge collected and transported by a certain client, the concentration of leached toxic inorganic fluoride (without calcium fluoride) is 326.2mg/L, the pH value is 10.3, the traditional method and the method of example 1 are respectively adopted for treatment, and the results are shown in the table 1:
table 1 waste solidification treatment results
Effect example 2:
the filter residue obtained by washing the filter residue collected and transported by a certain client is leached out, the concentration of toxic inorganic fluoride (without calcium fluoride) is 882mg/L, the pH value is 7.5, the traditional method and the method of example 2 are adopted for respectively processing, and the results are shown in the following table 2:
table 2 results of waste solidification treatment
Effect example 3:
the sludge from the wastewater treatment collected and transported by a certain client was treated by a conventional method and the method of example 3, respectively, at a leached toxic inorganic fluoride (calcium fluoride-free) concentration of 13235mg/L and a pH of 7.8, and the results are shown in Table 3:
TABLE 3 waste solidification treatment results
From the above examples and effect examples, it can be seen that the stabilization and solidification method for inorganic fluoride landfill hazardous waste has better effect in treating hazardous waste with different contents of inorganic fluoride (the concentration of leached toxic inorganic fluoride is 1000-15000mg/L, and no calcium fluoride), compared with the traditional method, the leached toxicity after treatment is obviously reduced, the pH value is stable, and the landfill hazardous waste is compounded to the standard of entering the field.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the present invention.
Claims (9)
1. A method for stabilizing and solidifying inorganic fluoride landfill waste is characterized by comprising the following steps:
(1) adding calcium chloride and water into the crushed hazardous waste to obtain a mixture A;
(2) adding a curing agent into the mixture A to obtain a mixture B;
(3) adding a phosphoric acid solution to the mixture B to obtain a mixture C.
2. The stabilized curing method according to claim 1, further comprising the step (4): and after maintaining all indexes of the mixture C to meet the standard of landfill dangerous waste entering, performing landfill treatment.
3. The stabilized solidification method of claim 1 wherein the particle size of the crushed hazardous waste is 60mm or less.
4. The stabilized curing method according to claim 1, wherein the amount of calcium chloride in the mixture A is 5 to 100 parts by weight.
5. The stabilized curing method according to claim 1, wherein the amount of the curing agent in the mixture B is 10 to 100 parts by weight.
6. The stabilized curing method of claim 5, wherein the curing agent is cement or hydrated lime.
7. The stabilized curing method according to claim 1, wherein the weight part of the phosphoric acid solution in the mixture C is 1 to 30 parts; the mass percentage of phosphoric acid in the phosphoric acid solution is 5%.
8. Use of the method for stabilizing and solidifying inorganic fluoride landfill hazardous waste according to any one of claims 1 to 7 in solidifying inorganic fluoride landfill hazardous waste.
9. The inorganic fluoride landfill hazardous waste of claim 8, wherein the inorganic fluoride landfill hazardous waste does not contain calcium fluoride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010559961.1A CN111922027A (en) | 2020-06-18 | 2020-06-18 | Stabilization and solidification method and application of inorganic fluoride landfill waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010559961.1A CN111922027A (en) | 2020-06-18 | 2020-06-18 | Stabilization and solidification method and application of inorganic fluoride landfill waste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111922027A true CN111922027A (en) | 2020-11-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010559961.1A Pending CN111922027A (en) | 2020-06-18 | 2020-06-18 | Stabilization and solidification method and application of inorganic fluoride landfill waste |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111922027A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112742844A (en) * | 2020-12-14 | 2021-05-04 | 孙刚 | Aluminum electrolytic cell overhaul waste residue stabilization solidified body and preparation method thereof |
| CN115382879A (en) * | 2022-09-30 | 2022-11-25 | 贵州星河环境技术有限公司 | Method and equipment for innocent treatment of overhaul residues and fly ash |
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2020
- 2020-06-18 CN CN202010559961.1A patent/CN111922027A/en active Pending
Patent Citations (12)
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| JP2002370093A (en) * | 2001-01-26 | 2002-12-24 | Shimonoseki Mitsui Chemicals Inc | High-degree treatment method for fluorine compound- containing liquid |
| JP2003206133A (en) * | 2002-01-15 | 2003-07-22 | Shimonoseki Mitsui Chemicals Inc | Gypsum wherein eluted fluorine is reduced |
| JP2004025136A (en) * | 2002-06-28 | 2004-01-29 | Shimonoseki Mitsui Chemicals Inc | Advanced fluorine treatment equipment |
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| JP2004243192A (en) * | 2003-02-13 | 2004-09-02 | Hitachi Constr Mach Co Ltd | Method and system for treating contaminated soil and contaminated soil treatment machine |
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| JP2008086911A (en) * | 2006-10-02 | 2008-04-17 | Kurita Water Ind Ltd | Civil engineering material and its manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115382879B (en) * | 2022-09-30 | 2024-02-06 | 贵州星河环境技术有限公司 | Harmless treatment method and equipment for overhaul slag and fly ash |
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Application publication date: 20201113 |