CN105622043A - Preparation method of non-sintered modified fly ash ceramsite and application thereof - Google Patents
Preparation method of non-sintered modified fly ash ceramsite and application thereof Download PDFInfo
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
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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
- C04B2111/23—Acid resistance, e.g. against acid air or rain
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Organic Chemistry (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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Abstract
The invention provides a preparation method of non-sintered modified fly ash ceramsite and application thereof, and belongs to the technical field of rainwater runoff treatment in non-point source pollution control. The preparation method comprises the steps of preparing of a modifying agent, modifying of fly ash lanthanum, non-sintered pelletizing of modified fly ash and adsorbing. The non-sintered modified fly ash ceramsite is applied to treatment of phosphorus pollution in rainwater runoff. The non-sintered modified fly ash is rough in surface, large in specific surface area, high in void fraction and high in acid rain resistance capacity, the removing rate of the non-sintered modified fly ash to phosphorus in the rainwater runoff reaches up to 97.9%, and the phosphorus content of treated rainwater meet the water standard of level I in Environmental Quality Standard for Surface Water (GB3838-2002); the non-sintered modified fly ash can be applied to the sponge city construction technology and has the good application prospect. The preparation method is simple in preparation process, low in cost and good in treatment effect, and the purpose of using waste to treat waste can be achieved.
Description
Technical field
The preparation method that the present invention relates to a kind of non-sintered modified coal ash haydite, is applied to remove the phosphorus in rainfall runoff, reduces body eutrophication risk, belongs to rainwater runoff treatment technical field during pollution of area source controls.
Background technology
Since recent decades, along with the fast development of Chinese Urbanization, urban waterlogging and in rainfall runoff phosphorus etc. to pollute the problems such as the body eutrophication that causes increasingly severe. In water body, the content of phosphorus and its eutrophication have direct relation, and when the total phosphorus concentration in water body is more than 0.02mg/L, namely this water body is in eutrophic state, body eutrophication meeting heavy damage water body environment, endanger hydrobiological growth. According to Liebig the least factor law, phosphorus is considered as the main factor causing body eutrophication. The concentration of total phosphorus in the rainwash in Lanzhou is monitored by Zhang Yuan, and result shows: in the rainwash of Lanzhou, the mean concentration of total phosphorus is 1.16mg/L, far above China earth's surface five class quality standards for water (total phosphorus < 0.4mg/L). Therefore must take the technological means of necessity, the phosphorus in urban rainfall runoff be polluted and is controlled, to reach to alleviate the purpose of body eutrophication, to environmental conservation, promote the well-being of mankind and have great importance.
A kind of method that the adsorption treatment of pollution of area source is simplicity, effective, technique is simple, cost is low, the key technology of this method is in that adsorbing material, and a kind of good adsorbing material should have the advantages such as specific surface area is big, intensity is high, absorption property is good, easily prepared and with low cost.
Flyash is the industrial solid castoff that China's discharge capacity is maximum, its stacking land occupation, contaminated environment. The mineralogical composition of flyash and loose structure make it have certain absorption property, the substrate of wastewater treatment can be directly used as, but the adsorption capacity of flyash itself and adsorption efficiency are not high, flyash are modified process and pelletize process is one of a kind of effective ways improving its adsorption capacity and adsorption efficiency. Current method of modifying mainly has alkali modification, acid to modifiy, synthetic zeolite from flyash, ion modification etc. Cao Shoukun selects HCl, NaOH, Al2(SO4)3And FeCl3It is modified for Removal of Phosphorus in Wastewater that flyash is carried out wet impregnation by four kinds of dissimilar modifying agent, it is shown that through FeCl3The tp removal rate of modified flyash reaches as high as 99%, and only has 69% through clearance that NaOH is modified is minimum, has 70% through the clearance that HCl is modified, the salt (FeCl of flyash3) modified effect is substantially better than that the acid of flyash is modified and alkali modification, but FeCl3Modified flyash has more Fe when processing water3+Ion release makes water quality partially yellow, and water is caused secondary pollution. Rare earth element outer layer contains the special construction of unsaturated electronic shell, has excellent physical and chemical performance, and the research that rare earth element is applied to water treatment field as dopant material or modifying agent is in laboratory stage mostly. Lanthanide series is low compared with other rare earth elements due to its cost, and point of zero electric charge is higher than higher, it has also become the rare earth element that adsorbent modifier is most widely used at present.
Summary of the invention
It is an object of the invention to provide high, the environmentally friendly non-sintered modified coal ash haydite of a kind of phosphorus high adsorption capacity, adsorption capacity and the application in pollution of area source processes thereof. Described flyash modified method is simple, with low cost, can effectively remove the phosphorus in rainfall runoff, reduces body eutrophication risk.
The preparation method that the invention provides a kind of non-sintered modified coal ash haydite based on above-mentioned purpose:
(1) preparation of modifying agent: add lanthanum chloride and LaCl in distilled water3, making lanthanum chloride mass concentration is 0.5%, adds sodium hydroxide, regulates PH to 9.
(2) lanthanum of flyash modifiies: in the modifying agent that every 100mL step (1) obtains, and adds 5g flyash, stirs 8h with the rotating speed of 300rpm/min, repeatedly rinses to neutrality with distilled water, at the drying of 100 DEG C of baking oven, natural cooling, crosses 120 mesh sieves.
(3) the non-sintered pelletize of modified coal ash: the best of non-sintered lytag is prepared formula and is: by lanthanum chloride modified coal ash, cement, expanded perlite, exciting agent and sodium silicate according to the quality of 6:2:1:1:1 than mix homogeneously, obtain compound; Add water allotment, and obtaining the mass ratio containing water mixture, water and compound is 9:25.
The weight ratio mixing that exciting agent in described step (3) is pressed 1:1 by NaOH and CaO prepares, and exciting agent can further improve the absorption property of flyash.
The application of described non-sintered modified coal ash haydite is: the phosphorus being applied to described non-sintered modified coal ash haydite process in rainfall runoff pollutes. Particularly as follows: be that 10g/L joins in rainfall runoff by non-sintered modified coal ash haydite according to dosage, vibrate about 30 minutes.
Beneficial effects of the present invention:
1. flyash is the industrial solid castoff that China's discharge capacity is maximum, its stacking land occupation, contaminated environment. Flyash is modified and non-sintered pelletize, for the removal of P elements in rainfall runoff, is conducive to environmental conservation.
2. P elements in rainfall runoff is had good removal effect by of the present invention modifiying, and percentage of damage and wear rate sum, clay content, hydrochloric acid soluble rate, porosity and specific surface area are satisfied by national standard " lightweight aggregate method of testing carries out " (GB2842 1) and industry standard " water processes and uses artificial ceramic grain filter " (CJ/T299 2008), wherein specific surface area value is 3.96 �� 104cm2/g, and numerical value is significantly larger than national normal value 0.5 �� 104cm2/g.
3. the present invention is a kind of utilizes that non-sintered modified coal ash haydite is simple to the minimizing technology of rainfall runoff P elements, cost consumption is low, removal effect good, has good using value.
Accompanying drawing explanation
Accompanying drawing 1 is the preparation flow figure of non-sintered lanthanum chloride modified coal ash haydite;
Accompanying drawing 2a is flyash sample (a) scanning electron microscope sem figure;
Accompanying drawing 2b is flyash sample (a) energy spectrum analysis EDS collection of illustrative plates;
Accompanying drawing 2c is lanthanum chloride modified coal ash (b) scanning electron microscope sem figure;
Accompanying drawing 2d is lanthanum chloride modified coal ash (b) energy spectrum analysis EDS collection of illustrative plates;
Accompanying drawing 3 is rainfall runoff P elements concentration is 0.6mg/L, when non-sintered lanthanum chloride modified coal ash haydite content is 10g/L, and the clearance of phosphorus and the relation of replicated experimental units.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, it is further elucidated with the present invention. It should be understood that following specific embodiments is merely to illustrate the present invention rather than restriction the scope of the present invention.
The preparation of non-sintered modified coal ash haydite:
(1) preparation of modifying agent: adding lanthanum chloride in distilled water, making lanthanum chloride mass concentration is 0.5%, adds sodium hydroxide, regulates PH to 9. When pH value>8.15 time, lanthanum ion start precipitation; When pH value reaches 9.33, lanthanum ion precipitation is completely. Adsorbance curves after pH<when 8 in rising trend, at pH>9 are mild gradually.
(2) lanthanum of flyash modifiies: in every 100mL modifying agent obtained by step (1), adds 5g flyash, stirs 8h with the rotating speed of 300rpm/min, repeatedly rinse to neutrality with distilled water, at the drying of 100 DEG C of baking oven, natural cooling, crosses 120 mesh sieves. SEM figure from accompanying drawing 2 is it can be seen that there is indenture through the flyash surface that lanthanum chloride is modified, and is attached with many little granules, increases specific surface area, also has many bright spots in figure, is that lanthanum chloride is carried on flyash to cause; EDS collection of illustrative plates can be seen that, containing new component lanthanum in lanthanum chloride modified coal ash, content is 2.07%, the changes of contents of each component is also little, illustrating in modifying process, lanthanum chloride is successfully carried in flyash, and content is also considerable, due to the attachment of lanthanum chloride, the absorption property of flyash have also been obtained raising.
(3) the non-sintered pelletize of modified coal ash: the best of non-sintered lytag is prepared formula and is: by lanthanum chloride modified coal ash, cement, expanded perlite, exciting agent and sodium silicate according to the quality of 6:2:1:1:1 than mix homogeneously, obtain compound. Add water allotment, and obtaining the mass ratio containing water mixture, water and compound is 9:25. To join in comminutor containing water mixture equably, until the non-sintered lytag diameter produced is more than 5mm. Wherein the interpolation of cement can corrode the surface of modified coal ash, improves its specific surface area; Expanded perlite makes the decrease in density of material; Exciting agent further improves the absorption property of flyash; Sodium silicate can increase the acid resistance of material, improves its suitability in acidic rain water runoff.
The application of described non-sintered modified coal ash haydite is: the phosphorus being applied to described non-sintered modified coal ash haydite process in rainfall runoff pollutes. Particularly as follows: be that 10g/L joins in rainfall runoff by non-sintered modified coal ash haydite according to dosage, vibrate about 30 minutes.
Prepared Novel free sintering flyash ceramic grain rough surface, specific surface area is big, voidage is high, resistance to acid rain is strong, property indices all meets national standard " lightweight aggregate method of testing carries out " (GB2842 817) and industry standard " water processes and uses artificial ceramic grain filter " (CJ/T299 2008), and wherein specific surface area value is 3.96 �� 104cm2/ g, numerical value is significantly larger than national normal value 0.5 �� 104cm2/ g, the absorption property of this non-sintered lytag also fully meets rainfall runoff dephosphorization needs. When Simulated rainwater runoff concentration is 0.6mg/L, the non-sintered modified coal ash haydite of 10g/L can adsorb the P elements of about 91.91%, and its adsorption capacity is about more than 5.54mg/g.
Claims (3)
1. the preparation method of a non-sintered modified coal ash haydite, it is characterised in that:
(1) preparation of modifying agent: adding lanthanum chloride in distilled water, making lanthanum chloride mass concentration is 0.5%, adds sodium hydroxide, regulates PH to 9;
(2) lanthanum of flyash modifiies: in every 100mL modifying agent obtained by step (1), adds 5g flyash, stirs 8h with the rotating speed of 300rpm/min, repeatedly rinse to neutrality with distilled water, at the drying of 100 DEG C of baking oven, natural cooling, crosses 120 mesh sieves;
(3) the non-sintered pelletize of modified coal ash: the best of non-sintered modified coal ash haydite is prepared formula and is: lanthanum chloride modified coal ash, cement, expanded perlite, exciting agent and sodium silicate are compared mix homogeneously according to the quality of 6:2:1:1:1; obtain compound; add water allotment; obtaining the mass ratio containing water mixture, water and compound is 9:25; To be placed in comminutor containing water mixture, be modified the non-sintered pelletize of lytag; Described non-sintered modified coal ash haydite is applied to remove phosphorus in rainfall runoff.
2. the preparation method of a kind of non-sintered modified coal ash haydite according to claim 1, it is characterised in that: the weight ratio mixing that the exciting agent in described step (3) is pressed 1:1 by NaOH and CaO prepares.
3. the preparation of a non-sintered modified coal ash haydite and application thereof, it is characterized in that: the phosphorus that described non-sintered modified coal ash haydite is applied to process in rainfall runoff pollutes, particularly as follows: be that 10g/L joins in runoff rainwater by non-sintered modified coal ash haydite according to dosage, vibrate about 30 minutes.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106311126A (en) * | 2016-10-14 | 2017-01-11 | 安徽理工大学 | Synthesis method of magnetic phosphorus adsorbent based on lanthanum loaded fly ash beads |
| CN106334531A (en) * | 2016-10-14 | 2017-01-18 | 安徽理工大学 | Preparation method of quaternary ammonium salt based modified pulverized fuel ash magnetic bead phosphorus adsorbent |
| CN110871050A (en) * | 2019-11-29 | 2020-03-10 | 东北电力大学 | Application of lanthanum modified ecological filler adsorbent and preparation method thereof |
| CN115057671A (en) * | 2022-04-15 | 2022-09-16 | 湖南先锋建材有限公司 | Light high-strength concrete and preparation method thereof |
| CN115141033A (en) * | 2021-03-31 | 2022-10-04 | 广东清大同科环保技术有限公司 | Baking-free ultra-light aggregate |
| CN117229041A (en) * | 2023-11-13 | 2023-12-15 | 天津包钢稀土研究院有限责任公司 | Method for preparing light ceramsite by using rare earth halide solution modifier |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106311126A (en) * | 2016-10-14 | 2017-01-11 | 安徽理工大学 | Synthesis method of magnetic phosphorus adsorbent based on lanthanum loaded fly ash beads |
| CN106334531A (en) * | 2016-10-14 | 2017-01-18 | 安徽理工大学 | Preparation method of quaternary ammonium salt based modified pulverized fuel ash magnetic bead phosphorus adsorbent |
| CN106311126B (en) * | 2016-10-14 | 2018-12-11 | 安徽理工大学 | A kind of magnetic phosphorus adsorbent synthetic method based on lanthanum load Fly ash bead |
| CN110871050A (en) * | 2019-11-29 | 2020-03-10 | 东北电力大学 | Application of lanthanum modified ecological filler adsorbent and preparation method thereof |
| CN115141033A (en) * | 2021-03-31 | 2022-10-04 | 广东清大同科环保技术有限公司 | Baking-free ultra-light aggregate |
| CN115057671A (en) * | 2022-04-15 | 2022-09-16 | 湖南先锋建材有限公司 | Light high-strength concrete and preparation method thereof |
| CN115057671B (en) * | 2022-04-15 | 2023-08-29 | 广西北海精一电力器材有限责任公司 | Light high-strength concrete and preparation method thereof |
| CN117229041A (en) * | 2023-11-13 | 2023-12-15 | 天津包钢稀土研究院有限责任公司 | Method for preparing light ceramsite by using rare earth halide solution modifier |
| CN117229041B (en) * | 2023-11-13 | 2024-01-30 | 天津包钢稀土研究院有限责任公司 | Method for preparing light ceramsite by using rare earth halide solution modifier |
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