CN116410015B - Method for firing ceramsite by using sea-related sludge with high salt content and high organic matter content - Google Patents
Method for firing ceramsite by using sea-related sludge with high salt content and high organic matter content Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 26
- 150000003839 salts Chemical class 0.000 title claims abstract description 24
- 239000005416 organic matter Substances 0.000 title claims abstract description 15
- 238000010304 firing Methods 0.000 title claims abstract description 12
- 239000000919 ceramic Substances 0.000 claims abstract description 36
- 238000005245 sintering Methods 0.000 claims abstract description 30
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 230000002378 acidificating effect Effects 0.000 claims abstract description 7
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000005469 granulation Methods 0.000 description 12
- 230000003179 granulation Effects 0.000 description 12
- 238000003756 stirring Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- 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 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 5
- 208000005156 Dehydration Diseases 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000012028 Fenton's reagent Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000006184 cosolvent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 2
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- -1 hydroxyl free radical Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
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- 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1328—Waste materials; Refuse; Residues without additional clay
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/606—Drying
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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Abstract
The invention discloses a method for firing ceramsite by using sea-related sludge with high salt content and high organic matter, and belongs to the technical field of ceramics. The method comprises the following steps: adjusting the pH value of sea-related sludge to be acidic, adding hydrogen peroxide and Fe 2+, adjusting the pH value to 6-8 by alkali after the reaction is completed, dehydrating, adding fly ash and slag, uniformly mixing, grinding, granulating, drying to obtain a ceramic green body, and pre-sintering and sintering the ceramic green body to obtain ceramic. The ceramsite prepared by the method has high strength and low water absorption, and can meet the requirements of being used as a building engineering material.
Description
Technical Field
The invention relates to the technical field of ceramics, in particular to a method for firing ceramsite by using sea-related sludge with high salt content and high organic matter content.
Background
The sea-related silt is used as a unique product of offshore operations such as coastal development, petroleum exploitation and the like, so that the risk of blocking a channel and endangering navigation safety exists, the accumulation of the sea-related silt can cause eutrophication of sea water and endanger a coastal cultivation base, and the fouling and even abandonment of a sea-water cultivation farm can be caused when the accumulation of the sea-related silt is serious, so that the economic development of coastal areas is greatly influenced.
Related departments in coastal areas can spend a great deal of manpower and material resources for dredging and dredging ports and channels each year, and the removed sea-related sludge has high salt content and organic matter content, so that the sea-related sludge has various limitations in application, and how to recycle the sea-related sludge with high salt content and high organic matter is a technical problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a method for firing ceramsite by using sea-related sludge with high salt content and high organic matter content. Firstly, removing organic matters in the high-salinity and high-organic matter sea-related sludge through Fenton oxidation, removing the salinity in the high-salinity and high-organic matter sea-related sludge through dehydration treatment, and finally preparing the high-strength ceramsite through matching with other materials.
In order to achieve the above purpose, the present invention provides the following technical solutions:
one of the technical schemes of the invention is as follows: the method for firing the ceramsite by using the sea-related sludge with high salt content and high organic matter comprises the following steps:
adjusting the pH value of sea-related sludge to be acidic, adding hydrogen peroxide and Fe 2+, adjusting the pH value to 6-8 by alkali after the reaction is completed, dehydrating, adding fly ash and slag, uniformly mixing, grinding, granulating, drying to obtain a ceramic green body, and pre-sintering and sintering the ceramic green body to obtain ceramic.
The sea-related sludge selected by the invention can be used as an adhesive when preparing the ceramsite, can improve the viscoplasticity of the ceramsite, is easy to form, and can avoid crushing caused by particle movement in the sintering process.
Preferably, the adjusting the pH of the sea-related sludge to be acidic is specifically adjusting the pH of the sea-related sludge to 3-5 with hydrochloric acid.
Fenton reagent generally degrades organic matters under acidic condition, fe 2+ is difficult to catalyze and oxidize H 2O2 to generate hydroxyl free radical under neutral or alkaline condition, and Fe 2+ forms precipitate under alkaline condition and loses catalytic capability; the concentration of H + is too high, so that Fe 3+ is difficult to reduce into Fe 2+, the progress of catalytic reaction is hindered, and when the pH value is 3-5, the whole reaction system can be rapidly carried out, and the degradation speed of organic matters is high.
Preferably, the mass ratio of the hydrogen peroxide to the sea-related sludge is (1-1.5): 10; the molar ratio of Fe 2+ to hydrogen peroxide is 1 (4-8).
Preferably, the reaction time is 10 to 15 minutes.
Preferably, the dehydration is to remove 50 to 60% of the water in the sea-related sludge whose pH is adjusted to 6 to 8.
Because the salt in the sea-related sludge with high salt content and high organic matter content is mainly soluble salt, the salt in the sea-related sludge can be removed simultaneously in the process of removing water, and the defect of high sintering temperature and energy consumption caused by overhigh salt content in the sea-related sludge in the preparation of ceramsite is avoided.
Preferably, the mass ratio of the fly ash, the slag and the sea-related sludge is (22-35): (13-33): (45-52).
Preferably, the temperature of the drying is 100-150 ℃ and the time is 4-6 h.
Preferably, the temperature of the pre-sintering is 480-550 ℃ and the time is 10-15 min.
The method has the advantages that through the step of adding the presintering, firstly, the formed ferrous hydroxide can be decomposed into ferric oxide, the generated ferric oxide can be used as a cosolvent, the sintering temperature is reduced, meanwhile, the ferric oxide can enable the ceramsite to generate more liquid phases and more complex crystalline phases at about 1000 ℃, the sintered surface structure is more compact, and the strength of the ceramsite is effectively improved; and secondly, the ceramic green body is pre-expanded through a pre-sintering step at a medium temperature, so that the ceramic green body is prevented from expanding too fast due to direct high temperature, cracks are generated, and the strength of the ceramic is prevented from being influenced.
Preferably, the sintering temperature is 950-1050 ℃ and the sintering time is 15-20 min.
Compared with the scheme of firing ceramsite by using sea-related sludge existing in the prior art, the sintering temperature of the invention is greatly reduced (the prior art is generally about 1200 ℃), and the energy consumption of recycling the sea-related sludge is effectively reduced.
The second technical scheme of the invention is as follows: provides the ceramsite prepared by the method for firing the ceramsite by using the sea-related sludge with high salt content and high organic matter.
The ceramic particles fired by the method have high strength and can meet the requirements of building engineering.
The beneficial technical effects of the invention are as follows:
The invention provides a technical scheme for firing ceramsite by taking sea-related sludge with high salt content and high organic matter as a raw material.
Firstly, organic matters in the sea-related sludge with high salt content and high organic matters are removed through Fenton oxidation, and the pH value of the sea-related sludge is adjusted to be acidic during oxidation, so that the removal rate and the removal speed of the organic matters are improved.
Then, the pH value is regulated to 6-8 by alkali, fe 2+ in Fenton reagent can be converted into ferrous hydroxide precipitate in this step, and the formed precipitate can be converted into cosolvent ferric oxide through a later pre-sintering process.
Further removing salt in the sea-related sludge with high salt content and high organic matters through dehydration treatment, wherein the salt in the sea-related sludge is soluble salt, and the salt is taken away in the process of removing water;
The dehydrated sea-related silt and fly ash (residual carbon in the fly ash can be used as fuel to provide heat energy, so that the energy consumed by sintering is saved) are compounded with slag, and the mixture is ground and granulated to obtain a ceramic green body;
the obtained ceramic green body is subjected to a series of drying and sintering processes to prepare the high-strength ceramic.
The method for recycling the sea-related sludge with high salt content and high organic matters can effectively solve the problem of disposal of the sea-related sludge, and meanwhile, the ceramsite prepared by taking the sea-related sludge as the raw material has high strength, low energy consumption in the preparation process and great popularization value.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The sea-related sludge used in the examples of the present invention is obtained from the sea area of Bohai sea (water content is 85%), and the contents of the components in the dry matter of the sea-related sludge (the dry matter remaining after drying at 105 ℃ until constant weight is obtained) are shown in Table 1.
TABLE 1 content of the components in the dry matter of sea sludge
The contents of the components in the fly ash used in the examples of the present invention are shown in Table 2.
TABLE 2 fly ash content of each component
The slag used in the examples of the present invention was blast furnace slag (particle diameter: 25mm or less), and the contents of the components are shown in Table 3.
TABLE 3 content of the components in blast furnace slag
Example 1
In the embodiment, the mass parts of the fly ash, the blast furnace slag and the sea-related sludge are 30 parts, 20 parts and 50 parts respectively.
The preparation method of the ceramsite comprises the following steps:
(1) Adding sea-related sludge into a stirrer, regulating the pH value of the sea-related sludge to 3.5 by using a hydrochloric acid solution with the concentration of 2mol/L, adding 18 parts of hydrogen peroxide with the mass fraction of 30%, adding ferrous sulfate heptahydrate with the concentration of 1/4 of H 2O2, uniformly stirring, and reacting for 10min;
(2) After the reaction is finished, the pH value of the reaction system is regulated to 6.5 by using 2mol/L NaOH solution, and the reaction system is transferred into a diaphragm plate-and-frame filter press for filter pressing until the water content of sea-related sludge is 60%;
(3) Adding fly ash and blast furnace slag, and uniformly stirring and then crushing by double rollers (the distance between the double rollers is adjusted to be 4 mm);
(4) Adding the crushed slurry into a granulator for granulation (the particle size is 10-20 mm), and baking for 6 hours at 105 ℃ after granulation to obtain ceramic green bodies;
(5) And (3) placing the ceramic green body into a rotary kiln, presintering for 15min at the temperature of 500 ℃, heating to 1000 ℃, and sintering for 15min to obtain the ceramic.
Example 2
In the embodiment, the mass parts of the fly ash, the blast furnace slag and the sea-related sludge are 25 parts, 30 parts and 45 parts respectively.
The preparation method of the ceramsite comprises the following steps:
(1) Adding sea-related sludge into a stirrer, regulating the pH value of the sea-related sludge to be 5 by using a hydrochloric acid solution with the concentration of 2mol/L, adding 17 parts of hydrogen peroxide with the mass fraction of 30%, adding ferrous sulfate heptahydrate with the molar quantity of H 2O2 to be 1/4, uniformly stirring, and reacting for 13min;
(2) After the reaction is finished, the pH value of the reaction system is regulated to 6.5 by using 2mol/L NaOH solution, and the reaction system is transferred into a diaphragm plate-and-frame filter press for filter pressing until the water content of sea-related sludge is 60%;
(3) Adding fly ash and blast furnace slag, and uniformly stirring and then crushing by double rollers (the distance between the double rollers is adjusted to be 4 mm);
(4) Adding the crushed slurry into a granulator for granulation (the particle size is 10-20 mm), and baking at 130 ℃ for 5 hours after granulation to obtain ceramic green bodies;
(5) And (3) placing the ceramic green body into a rotary kiln, presintering for 13min at the temperature of 520 ℃, heating to 1000 ℃, and sintering for 15min to obtain the ceramic.
Example 3
In the embodiment, the mass parts of the fly ash, the blast furnace slag and the sea-related sludge are 35 parts, 13 parts and 52 parts respectively.
The preparation method of the ceramsite comprises the following steps:
(1) Adding sea-related sludge into a stirrer, regulating the pH value of the sea-related sludge to be 4 by using a hydrochloric acid solution with the concentration of 2mol/L, adding 22 parts of hydrogen peroxide with the mass fraction of 30%, adding ferrous sulfate heptahydrate with the molar quantity of H 2O2 to be 1/6, uniformly stirring, and reacting for 10min;
(2) After the reaction is finished, the pH value of the reaction system is regulated to 7 by using 2mol/L NaOH solution, and the reaction system is transferred to a diaphragm plate-and-frame filter press for filter pressing until the water content of sea-related sludge is 50%;
(3) Adding fly ash and blast furnace slag, and uniformly stirring and then crushing by double rollers (the distance between the double rollers is adjusted to be 4 mm);
(4) Adding the crushed slurry into a granulator for granulation (the particle size is 10-20 mm), and baking for 4 hours at 150 ℃ after granulation to obtain ceramic green bodies;
(5) And (3) placing the ceramic green body into a rotary kiln, presintering for 15min at 480 ℃, heating to 950 ℃, and sintering for 20min to obtain the ceramic.
Example 4
In the embodiment, the mass parts of the fly ash, the blast furnace slag and the sea-related sludge are respectively 22 parts, 33 parts and 45 parts.
The preparation method of the ceramsite comprises the following steps:
(1) Adding sea-related sludge into a stirrer, regulating the pH value of the sea-related sludge to 3 by using a hydrochloric acid solution with the concentration of 2mol/L, adding 14 parts of hydrogen peroxide with the mass fraction of 30%, adding ferrous sulfate heptahydrate with the molar quantity of H 2O2 to 8, uniformly stirring, and reacting for 15min;
(2) After the reaction is finished, the pH value of the reaction system is adjusted to 8 by using 2mol/L NaOH solution, and the reaction system is transferred to a diaphragm plate-and-frame filter press for filter pressing until the water content of sea-related sludge is 50%;
(3) Adding fly ash and blast furnace slag, and uniformly stirring and then crushing by double rollers (the distance between the double rollers is adjusted to be 4 mm);
(4) Adding the crushed slurry into a granulator for granulation (the particle size is 10-20 mm), and baking for 6 hours at 105 ℃ after granulation to obtain ceramic green bodies;
(5) And (3) placing the ceramic green body into a rotary kiln, presintering for 10min at 550 ℃, heating to 1050 ℃, and sintering for 15min to obtain the ceramic.
Comparative example 1
The difference compared with example 1 is that the pre-sintering step is omitted, the sintering time is prolonged by 10min, and the other operations are the same as in example 1.
Comparative example 2
In this comparative example, the mass parts of fly ash, blast furnace slag and sea-related sludge were 30 parts, 20 parts and 50 parts, respectively (the same as in example 1).
The preparation method of the ceramsite comprises the following steps:
(1) Adding sea-related sludge into a stirrer, regulating the pH value of the sea-related sludge to 3.5 by using a hydrochloric acid solution with the concentration of 2mol/L, adding 18 parts of hydrogen peroxide with the mass fraction of 30%, adding ferrous sulfate heptahydrate with the concentration of 1/4 of H 2O2, uniformly stirring, and reacting for 10min;
(2) After the reaction is finished, the mixture is transferred into a diaphragm plate-and-frame filter press for filter pressing until the water content of sea-related sludge is 60 percent (the difference from the embodiment 1 is that the step of adjusting the pH value by alkali is omitted);
(3) Adding fly ash and blast furnace slag, and uniformly stirring and then crushing by double rollers (the distance between the double rollers is adjusted to be 4 mm);
(4) Adding the crushed slurry into a granulator for granulation (the particle size is 10-20 mm), and baking for 6 hours at 105 ℃ after granulation to obtain ceramic green bodies;
(5) And (3) placing the ceramic green body into a rotary kiln, presintering for 15min at the temperature of 500 ℃, heating to 1000 ℃, and sintering for 15min to obtain the ceramic.
Comparative example 3
In this comparative example, the mass parts of fly ash, blast furnace slag and sea-related sludge were 30 parts, 20 parts and 50 parts, respectively (the same as in example 1).
The preparation method of the ceramsite comprises the following steps:
(1) Putting sea-related sludge into a diaphragm plate-and-frame filter press for filter pressing until the water content of the sea-related sludge is 60% (the difference from the embodiment 1 is that the steps of Fenton oxidation and pH value adjustment by adding alkali are omitted);
(2) Adding fly ash and blast furnace slag, and uniformly stirring and then crushing by double rollers (the distance between the double rollers is adjusted to be 4 mm);
(3) Adding the crushed slurry into a granulator for granulation (the particle size is 10-20 mm), and baking for 6 hours at 105 ℃ after granulation to obtain ceramic green bodies;
(4) And (3) placing the ceramic green body into a rotary kiln, presintering for 15min at the temperature of 500 ℃, heating to 1000 ℃, and sintering for 15min to obtain the ceramic.
The technical indexes of the ceramsite obtained in examples 1 to 4 and comparative examples 1 to 2 were measured, respectively, and the measurement results are shown in Table 4.
The cylinder pressure strength of each group of samples is detected according to GB/T2842-1981 lightweight aggregate test method;
Bulk density is determined by dividing the total mass of non-tapped particulate material in a naturally packed state by the total volume of the packed material;
The method for measuring the water absorption rate comprises the following steps: each group of ceramsite is soaked in water for 1h, the surface moisture is wiped by a towel after being taken out, the surface moisture is weighed (m 1), then the ceramsite is dried to constant weight (m 2) at 105 ℃, and the water absorption (%) = (m 1-m2)/m2 multiplied by 100%).
Table 4 technical indices of ceramsite prepared in each example and comparative example
As can be seen from Table 4, the ceramsite prepared in examples 1 to 4 of the present invention has high strength and low water absorption; in the case of omitting the pre-sintering (comparative example 1), the cylinder pressure of the ceramsite is reduced, and the water absorption rate and the loose bulk density are improved, because the expansion speed in the sintering process is too high, so that the volume is increased and a small amount of cracks are generated, and the cylinder pressure of the ceramsite is influenced; under the condition that the pH value is not regulated by alkali (comparative example 2), the pressure of the ceramsite cylinder is reduced, the loose packing density and the water absorption rate are slightly improved, and the reason is probably that when the pH value is not regulated to be nearly neutral, ferric salt is correspondingly reduced in the dehydration process, the content of ferric oxide is reduced in the later sintering process, the density of the ceramsite is influenced, and the pressure of the cylinder is reduced; under the condition that Fenton oxidization is omitted (comparative example 3), the cylinder pressure of the ceramsite is obviously reduced, the water absorption rate and the loose bulk density are obviously improved, and the reason is probably that under the condition that organic matters are not removed, the organic matters of the ceramsite are largely decomposed in the firing process, so that the thermal expansion degree of the ceramsite is overlarge, and the cylinder pressure intensity and the water absorption rate of the ceramsite are directly influenced.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (2)
1. The method for firing the ceramsite by using the sea-related sludge with high salt content and high organic matter is characterized by comprising the following steps of:
Adjusting the pH value of sea-related sludge to be acidic, adding hydrogen peroxide and Fe 2+, adjusting the pH value to 6-8 by alkali after the reaction is completed, dehydrating, adding fly ash and slag, uniformly mixing, grinding, granulating, drying to obtain a ceramic green body, and pre-sintering and sintering the ceramic green body to obtain ceramic;
The pH value of the sea-related sludge is regulated to be acidic, specifically, the pH value of the sea-related sludge is regulated to be 3-5 by hydrochloric acid;
the mass ratio of the hydrogen peroxide to the sea-related sludge is (1-1.5): 10; the molar ratio of the Fe 2+ to the hydrogen peroxide is 1 (4-8);
the reaction time is 10-15 min;
the dehydration is to remove the water in the sea-related sludge with the pH value adjusted to 6-8 to 50-60%;
The mass ratio of the fly ash to the slag to the sea-related sludge is (22-35): (13-33): (45-52);
the temperature of the drying is 100-150 ℃ and the time is 4-6 h;
The presintering temperature is 480-550 ℃ and the presintering time is 10-15 min;
The sintering temperature is 950-1050 ℃ and the sintering time is 15-20 min.
2. A ceramsite prepared by the method for firing the ceramsite by using the high-salt-content high-organic matter sea-related sludge according to claim 1.
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