CN101844906B - Method for preparing sediment mud and sand into high-intensity building materials through improving activity by calcination - Google Patents
Method for preparing sediment mud and sand into high-intensity building materials through improving activity by calcination Download PDFInfo
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- CN101844906B CN101844906B CN2010101484193A CN201010148419A CN101844906B CN 101844906 B CN101844906 B CN 101844906B CN 2010101484193 A CN2010101484193 A CN 2010101484193A CN 201010148419 A CN201010148419 A CN 201010148419A CN 101844906 B CN101844906 B CN 101844906B
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- sand
- silt
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- mud
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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
- C04B20/04—Heat treatment
-
- 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
- C04B28/18—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 mixtures of the silica-lime type
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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
Abstract
The invention relates to a method for preparing sediment mud and sand into high-intensity building materials through improving activity by calcination, which comprises the following concrete steps: calcining the taken sediment mud and sand at the temperature between 300 DEG C and 1000 DEG C for 1 to 6 hours (the cooled mud and sand can be used as starting materials for hydro-thermal treatment); adding lime hydrate into the obtained mud and sand to form mixed materials; making the mol rate of CaO to SiO2 in the mixed materials be ranged from 0.2/1 to 1.2/1; then, adding water accounting for 5 to 20 percent of the total weight of the mixed materials; placing the materials into a mold to be formed after being uniformly mixed and controlling the forming pressure intensity between 10 and 40 MPa; and placing the demolded formed products into a hydro-thermal reaction kettle for carrying out hydro-thermal treatment for 1 to 36h at the temperature between 70 and 200 DEG C and the saturated steam pressure with the pressure intensity between 0.1 and 1.55 MPa to obtain the required products. The invention improves the reaction activity of the mud and sand, so the intensity of the products is greatly improved.
Description
Technical field
The present invention relates to a kind of active method for preparing sediment mud and sand into high-intensity building materials through of calcining raising of utilizing.
Background technology
At present the rivers shoal materials is mainly produced material of construction through traditional process for calcining, like material of construction such as Yellow River mud sintering internal burned brick, Yellow River mud sand-lime solid brick, Yellow River mud sintered hollow block, Yellow River mud sintered perforated brick (load bearing hollow brick), Yellow River mud building watt and terra-cotta.Be application for a patent for invention " a kind of Huanghe river silt energy-saving brick and working method thereof " like the disclosed publication number CN 1948204 on September 3rd, 2008 of Intellectual Property in China office.Disclosed method is made up of following raw materials by weight percent: Yellow River mud 50-64%, coal gangue 35-45%, additive 0-10%.Mixed starting material are sent into the brick extruding machine extrusion moulding, send into annular kiln after the formed body drying and be fired into finished product.Firing temperature is than higher in the traditional method, and generally more than 800 ℃, and sintering time is long, and generally more than 24 hours, so power consumption is high, cost is high.And for example the disclosed publication number CN 101255045 on September 3rd, 2008 of Intellectual Property in China office is application for a patent for invention " a kind of non-burning brick and working method of utilizing Yellow River mud to process "; Disclosed method is after being mixed by following materials of weight proportions, to push form non-burning brick, Yellow River mud: 50～70% with press; Fluorine gypsum powder: 20～30%; Cement: 5～10%, potassium aluminium sulfate: 3～5%, acrylic acid or the like building gelatine powder: 2～5%.This method is produced and is non-burning brickly needed to add several additives such as cement, and non-burning brick intensity is not strong, and the restriction heavy industrialization is used.The Intellectual Property in China office patent No. is that the patent of invention " the rivers shoal materials being solidified into the method for ceramic building material " of ZL 2,005 1 0096205.5 is though had significant improvement on the intensity of preparation temperature and product; But owing to contain organic matter in the rivers shoal materials; Hindered the contact between sand grain; Influence its reaction, and organic reasons such as volatilization have restricted the further raising of product strength.
The application is on the basis of " the rivers shoal materials being solidified into the method for ceramic building material " patent; Remove the organism in the silt through silt being carried out calcining pretreatment; And calcining makes in the silt some mineral slough middle water, makes it become unsure state, increased the activity of silt; Improve speed of response, and then obtained high-intensity building materials.
Summary of the invention
The purpose of this invention is to provide a kind of active method for preparing sediment mud and sand into high-intensity building materials through of calcining raising of utilizing.
The utilization calcining that the present invention proposes improves the active method for preparing sediment mud and sand into high-intensity building materials through, and concrete steps are following:
(1) pre-treatment of silt
Getting shoal materials is calcined under 300 ℃～1000 ℃ temperature, and calcination time is 1-6 hour, and cooled silt promptly can be used as expecting of hydrothermal treatment consists;
(2) moulding
In the silt of step (1) gained, add slaked lime and form compound, make CaO and SiO in the mixture
2Mol ratio be 0.2: 1～1.2: 1, add the water of compound gross weight 5%～20% then, after mixing, put into die for molding, control moulding pressure is 10～40MPa;
(3) hydrothermal treatment consists
Moulding article after the demoulding are put into hydrothermal reaction kettle, are that 70～200 ℃, pressure are that the saturation steam of 0.1～1.55MPa is depressed hydrothermal treatment consists 1～36h in temperature, promptly get desired product.
Among the present invention, the incinerating purpose is to remove organism contained in the silt, remove combination water and the crystal water in the mineral or make some mineral decomposition, structure reach unstable state, to improve the reactive behavior of silt.
Method of the present invention is the hydro-thermal solidification method, compares with traditional firing process, and the hydro-thermal solidification value is low, save energy.Calcination processing can be removed planar water and organism in the shoal materials, and making its structure is unsteady state, thus the reactive behavior raising, and then the intensity of enhancing product.
Description of drawings
Fig. 1 hydro-thermal is solidified the bending strength comparison of silt sample after not calcining and the 800 ℃ of calcinings.
00 ℃ of calcination time of Figure 28 is to the influence of hydro-thermal solidified sample bending strength.
The add-on of 00 ℃ of silt calcining of Figure 33 back water is to the influence of hydro-thermal solidified sample bending strength.
00 ℃ of silt calcining of Figure 43 aftershaping pressure is to the influence of hydro-thermal solidified sample bending strength.
The influence of the addition of back slaked lime to the sample bending strength do not calcined and calcined to Fig. 5 silt.
Fig. 6 silt do not calcine with 500 ℃ of calcinings after Different Ca/Si to the influence mutually of sample resultant.
The back hydro-thermal set time of the influence to the sample bending strength is not calcined and calcined to Fig. 6 silt.
Fig. 7 silt do not calcine with 500 ℃ of calcinings after the SEM figure of hydro-thermal solidified sample.
The sample microscopic appearance of Fig. 8 silt after 500 ℃ of calcining anteroposterior diameter hydro-thermals are solidified.
Embodiment
Further specify the present invention through embodiment below.
Embodiment 1:
Choose the rivers shoal materials of 300 ℃ of calcinings after 6 hours as main raw material, slaked lime is an addition material.Above-mentioned raw materials is mixed by a certain percentage, make its CaO/SiO
2Mol ratio is 0.2: 1.Then, in above-mentioned compound, add the water of compound gross weight 5%, after mixing, moulding on press (moulding pressure is 20MPa).At last, the sample after the demoulding being put into reaction kettle, is temperature in condition: 70 ℃, time: following hydro-thermal was solidified in 1 hour, treat that hydro-thermal reaction finishes after, sample is taken out, promptly obtain final product.
Embodiment 2:
Choose the rivers shoal materials of 500 ℃ of calcinings after 1 hour as main raw material, slaked lime is an addition material.The two is mixed by a certain percentage, make the CaO/SiO in the compound
2Mol ratio is 0.6: 1.Then, in above-mentioned compound, add the water of compound total amount 10%, after mixing, moulding on press (moulding pressure is 30MPa).At last, the formed body after the demoulding being put into reaction kettle, is 100 ℃ in the hydro-thermal solidification value, and be to solidify down in 12 hours set time, treat that hydro-thermal reaction finishes after, sample is taken out, promptly obtain final product.
Embodiment 3:
Choose 500 ℃ the calcining 2 hours after the rivers shoal materials be main raw material, slaked lime is an addition material.Above-mentioned raw materials is mixed by a certain percentage, make the CaO/SiO in the compound
2Mol ratio is 0.8: 1.Then, in above-mentioned compound, add the water of compound total amount 10%, after mixing, moulding on press (moulding pressure is 40MPa).At last, the formed body after the demoulding being put into reaction kettle, is 150 ℃ in temperature, and following hydro-thermal was solidified in 24 hours, treat that hydro-thermal reaction finishes after, sample is taken out, promptly obtain final product.
Embodiment 4:
Choose 800 ℃ the calcining 2 hours after the rivers shoal materials be main raw material, slaked lime is an addition material.Above-mentioned raw materials is mixed, make the CaO/SiO in the compound
2Mol ratio is 1: 1.Then, in above-mentioned compound, add the water of compound total amount 15%, after mixing, moulding on press (pressure is 10MPa).At last, the formed body after the demoulding being put into reaction kettle, is 200 ℃ in temperature, and the time is that 36 hours following hydro-thermals are solidified, treat that hydro-thermal reaction finishes after, sample is taken out, promptly obtain final product.
Embodiment 5:
Choose 1000 ℃ the calcining 2 hours after the rivers shoal materials be main raw material, slaked lime is an addition material.Above-mentioned raw materials is mixed, make the CaO/SiO in the compound
2Mol ratio is 1.2: 1.Then, in above-mentioned compound, add the water of compound total amount 20%, after mixing, moulding on press (moulding pressure is 30MPa).At last, the formed body after the demoulding being put into reaction kettle, is 200 ℃ in temperature, and the time is that hydro-thermal is solidified under 9 hours the condition, treat that hydro-thermal reaction finishes after, sample is taken out, promptly obtain final product.
Hydro-thermal curing calcining back rivers shoal materials is that the hardening mechanism of strong material is: the silt calcining can be removed organism, middle water and the combination water in the silt, forms unsettled structure, and then improves the reactive behavior of silt.Hydro-thermal curing belongs to dissolving-precipitation process, and the solubleness of mineral is greatly enhanced in the silt under hydrothermal condition, quickens to generate hydrated calcium silicate, and the generation of hydrated calcium silicate has increased the density of sample, so intensity is tentatively improved.Along with the carrying out of reaction, hydrated calcium silicate is converted into the vigorous mullite of holder of laminate structure, and it is fibrous or sheet, and mutually weave in is filled in the space between sand grain, and the final raising of intensity is played most important effect.
Do experiment with the Yellow River, somewhere shoal materials below and further specify the present invention:
Fig. 1 has provided the calcination processing influence to hydro-thermal curing back sample strength in 2 hours.As can be seen from the figure, at Ca/SiO
2When mol ratio is identical, the bending strength of not calcining silt hydro-thermal solidified sample far below 800 ℃ of calcinings of silt after the bending strength of hydro-thermal solidified sample.Show that calcination processing can improve sample strength.
Fig. 2 has provided 800 ℃ of sample bending strengths of different calcination times down.As can be seen from the figure, calcination time was since 2 hours, and the sample bending strength changes little.And the sample bending strength is lower under the less calcination time, possibly be because calcining thoroughly due to.
Fig. 3 has explained the influence of the addition of water to shoal materials cured body intensity.Through to shoal materials and the mixture (CaO/SiO of slaked lime of 300 ℃ of calcinings after 2 hours
2=0.8) water of adding 5%, 10%, 15% and 20% in mixes the back at 30MPa pressure compacted under, and formed body solidified 12 hours 200 ℃ of following hydro-thermals.Can find out that along with the increase of the addition of water, the sample bending strength increases, but add when too much when water that the product strength increase is not obvious.
Fig. 4 shows the influence of forming pressure to the sample bending strength.2 hours the silt of 300 ℃ of calcinings and the mixture (CaO/SiO of slaked lime
2=0.8) water of adding 10% is put into die for molding after mixing in, and moulding pressure is respectively 10MPa, 20MPa, 30MPa, 40MPa, and the formed body after the demoulding solidified 12 hours 200 ℃ of following hydro-thermals.Can know that by figure sample strength increases with the increase of forming pressure.But excessive forming pressure improves intensity and is not obvious.
Fig. 5 has explained the add-on (CaO/SiO of slaked lime
2) and silt calcining to the influence of sample bending strength.The calcining temperature of silt is respectively 300 ℃, 500 ℃, 800 ℃ and 1000 ℃, and the time is 2 hours.Can find out, when silt is not calcined, CaO/SiO
2Ratio was at 0.8 o'clock, and sample strength is the highest; And after the calcining, under the equal calcining temperature, with CaO/SiO
2The increase of ratio and increase CaO/SiO
2Than being 0.6 o'clock, the sample bending strength under each calcining temperature is maximum, and intensity descends to some extent subsequently.Along with the raising of silt calcining temperature, at identical CaO/SiO
2Condition under, 800 ℃ of temperature incinerating sample strengths are the highest, at CaO/SiO
2Than being that 0.8 o'clock bending strength is up to 23MPa.But the sample strength after 1000 ℃ of calcinings is on a declining curve, is lower than 500 ℃ of incinerating samples, a little more than incinerating sample not.The optimum calcinating temperature that silt is described is 800 ℃, and the burning meeting improves intensity plays negative impact, but in general, calcining back sample strength is superior to not incinerating.
Fig. 6 has provided not calcining and has calcined the accompany addition add-on (CaO/SiO of slaked lime of the thing in the sample after 2 hours with 500 ℃
2) the XRD figure spectrum that changes.The hydro-thermal condition of cure is: 10% water, 30MPa moulding, 200 ℃ of hydrothermal treatment consists 12 hours.Can be known that by figure (a) silt is without when calcining, contained thing comprises quartz, feldspar, larnite and gismondine etc. mutually.Work as CaO/SiO
2Be 0.6 o'clock, occurred newly entrusting vigorous mullite, and ask the diffraction peak of vigorous mullite not fairly obvious.Can know that by figure (b) calcining back silt is at CaO/SiO
2Be just to occur the vigorous mullite phase of holder at 0.4 o'clock.Explain that calcining makes the vigorous mullite of holder generate more easily mutually.
Fig. 7 is hydro-thermal is calcined the sample bending strength of pre-process and post-process set time to silt influence.The calcination condition of silt is identical with Fig. 5.Can know by figure, after identical calcination processing, the mixture (CaO/SiO of silt and slaked lime
2=0.8) 24 hours intensity of 200 ℃ of hydro-thermal curing is the highest, and the sample bending strength begins to descend when prolonging set time.In the sample after the silt calcining, 800 ℃ bending strength is higher than the sample strength under other calcining temperatures, secondly is 500 ℃, 1000 ℃ and 300 ℃.The optimum calcinating temperature that silt is described is 800 ℃, and silt burning (1000 ℃) is played certain negative impact to the raising of sample strength, relatively wastes energy.In addition, from figure, can find the mixture (CaO/SiO of the silt of calcination processing and slaked lime
2=0.8), the short period of time hydro-thermal is solidified the back sample strength before the calcining.Show that incinerating truly has and is beneficial to the activity that improves silt.
Fig. 8 has provided the sample microscopic appearance of silt after 500 ℃ of calcining anteroposterior diameter hydro-thermals are solidified.The hydro-thermal condition of cure is: CaO/SiO
2Be 0.8,10% water, 30MPa moulding, 200 ℃ of hydrothermal treatment consists 12 hours.Can know that by figure (a) (used silt is not calcined) and figure b (500 ℃ of calcinings) generated the vigorous mullite of the network-like holder of mutual agglutinating in the sample, they have been full of the sand grain gap, raising plays an important role to intensity.
More than the present invention has been carried out detailed introduction, used concrete instance in the literary composition the present invention set forth, this is can understand and use the present invention for the ease of the those of ordinary skill of this technical field.The personnel of skilled can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied among other embodiment in thought of the present invention.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (1)
1. one kind is utilized calcining to improve the active method for preparing sediment mud and sand into high-intensity building materials through, it is characterized in that concrete steps are following:
(1) pre-treatment of silt
Getting shoal materials is calcined under 300 ℃～1000 ℃ temperature, and calcination time is 1-6 hour, and cooled silt promptly can be used as expecting of hydrothermal treatment consists;
(2) moulding
In the silt of step (1) gained, add slaked lime and form compound, make CaO and SiO in the mixture
2Mol ratio be 0.2: 1～1.2: 1, add the water of compound gross weight 5%～20% then, after mixing, put into die for molding, control moulding pressure is 10～40MPa;
(3) hydrothermal treatment consists
Moulding article after the demoulding are put into hydrothermal reaction kettle, are that 70～200 ℃, pressure are that the saturation steam of 0.1～1.55MPa is depressed hydrothermal treatment consists 1～36h in temperature, promptly get desired product.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101484193A CN101844906B (en) | 2010-04-15 | 2010-04-15 | Method for preparing sediment mud and sand into high-intensity building materials through improving activity by calcination |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101484193A CN101844906B (en) | 2010-04-15 | 2010-04-15 | Method for preparing sediment mud and sand into high-intensity building materials through improving activity by calcination |
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| CN101844906A CN101844906A (en) | 2010-09-29 |
| CN101844906B true CN101844906B (en) | 2012-06-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102431081A (en) * | 2011-09-01 | 2012-05-02 | 同济大学 | Method for solidifying river sediment into building material under normal pressure |
| CN104275731B (en) * | 2013-07-10 | 2017-05-10 | 孝昌创意民族模具装饰有限公司 | Method for preparing Hui style architecture eave glazed tile |
| CN104743998B (en) * | 2015-03-06 | 2016-08-24 | 同济大学 | A kind of sea sand wet type is fired the method becoming high-intensity building materials |
| CN111548102B (en) * | 2020-06-29 | 2022-03-18 | 郑州大学 | Mortar and preparation method and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1785890A (en) * | 2005-10-20 | 2006-06-14 | 景镇子 | Method of solidifying river selimented silt as ceramic construction material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000219566A (en) * | 1999-01-29 | 2000-08-08 | Japan Sewage Works Agency | Production of ceramic building material |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1785890A (en) * | 2005-10-20 | 2006-06-14 | 景镇子 | Method of solidifying river selimented silt as ceramic construction material |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2000-219566A 2000.08.08 |
| 张金升等.黄河淤泥沙的综合利用.《中国建材》.1994,(第12期),35-36. * |
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