CN102491707B - Method of preparing baking-free load-bearing bricks through steam curing of semidry desulfurization residues - Google Patents
Method of preparing baking-free load-bearing bricks through steam curing of semidry desulfurization residues Download PDFInfo
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- CN102491707B CN102491707B CN2011103875444A CN201110387544A CN102491707B CN 102491707 B CN102491707 B CN 102491707B CN 2011103875444 A CN2011103875444 A CN 2011103875444A CN 201110387544 A CN201110387544 A CN 201110387544A CN 102491707 B CN102491707 B CN 102491707B
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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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Abstract
The invention discloses a method of preparing baking-free load-bearing bricks through steam curing of semidry desulfurization residues, belonging to the technical fields of environmental engineering and preparation of construction material. According to the invention, a gelling agent is prepared from semidry desulfurization slag and multi-component powder and is uniformly mixed with inert sandy aggregate in a mixer, water accounting for 10 to 46% of the mass of solid powder is added and uniformly mixed with the solid powder, an obtained mixture undergoes pressure forming and demolding so as to obtain green bricks, and the green bricks are subjected to steam curing at a temperature of 40 to 90 DEG C for 1 to 7 d so as to obtain baking-free bricks with sufficient strength; the baking-free bricks can meet different strength requirements for load-bearing bricks of a model number in a range of MU10 to MU30, have excellent water resistance and can be used as exterior wall tiles. According to the invention, the problem that comprehensive utilization of semidry desulfurization gypsum is not easy due to complex composition of the semidry desulfurization gypsum is overcome; effective usage of solid waste in production of the baking-free bricks which cost less than conventional sintered clay bricks do has great significance to energy conservation and environmental protection.
Description
Technical field
The invention belongs to environment-friendly engineering and material of construction preparing technical field, be specifically related to a kind of steam-cured method for preparing no-baking bearing brick of semidry desulfurization waste residues of utilizing.
Background technology
After coal-fired flue gas desulfurization purifies again in the atmosphere discharging be a fast-developing both at home and abroad green technology, be widely adopted in each major industry field, wherein can produce a large amount of desulfurated plasters with lime or slaked lime during as the desulfurization medium.Early stage desulfurization technology is take wet method and dry method dual mode as main, and wet desulphurization produces the desulfurated plaster of a large amount of sludge-like, and the product of dry desulfurization is generally discharged with flyash or slag, can not discharge separately desulfurated plaster.The gypsum of wet desulphurization is widely used at present produces all kinds of material of construction, a large amount of patented technologies has been arranged and formed the technical system that a cover is mature on the whole.
Semi-dry desulphurization is a fast-developing in recent years class desulfurization technology, compares with wet desulphurization, have do not produce sewage, desulfurization product without dewatered drying, take up an area less, the characteristics such as investment is little and cost is low.Therefore, compare with wet desulphurization, semi-dry desulphurization has the progress of leap property aspect energy-saving and emission-reduction.But the phase of Calcium Sulfite forms complicated far beyond the wet desulphurization slag, thereby makes the disposal and utilization difficult of dry desulfurization slag, becomes one of bottleneck of semi-dry desulphurization complete set technology popularization.
Invention CN101352893B is take semi-dry processed desulfurization gypsum and blast furnace granulated slag as the raw material production dry-mixed mortar.This invents by weight percentage that the slag powders of 10-30% and the semi-dry processed desulfurization gypsum of 10-30% and the medium sand of 60-80% mix in mixer, obtain dry-mixed masonry mortar, and 28 days ultimate compression strength of mortar are between 8-20MPa.But also there is following problems in this mortar: 1. its early strength is on the low side, it is used be subject to more restriction; 2. the volume of desulfurization slag in mortar is too low, makes the cost of this kind dry-mixed mortar higher, and is unfavorable for a large amount of disposal and utilization desulfurization slag; 3. the long wearing of this kind building mortar not yet is verified, and experiment shows the impact that postpone to generate because of ettringite, and its longterm strength may degradation even because of swelling cracking, and it is used risk and can not be ignored.
Summary of the invention
The object of the invention is to for the defects that exists in the prior art, provide a kind of take Calcium Sulfite as main raw material by the steam-cured method for preparing no-baking bearing brick, adopt the no-baking bearing brick of the inventive method preparation can reach the needed intensity of external wall heavy-load bearing brick, weather resistance and water tolerance.
The inventive method comprises the step of following order:
(a) Calcium Sulfite, this desulfurization slag be canescence to the ecru fines, median size is 4-10um, the BET specific surface area is 2-10m
2/ g; It consists of: the quality percentage composition is the CaO of 40-50%, the SO of 8-16%
3, 10-18% SO
2, 1-3% TFe, the SiO of 0.2-1.0% of MgO, 1-2%
2, 0.4-0.6% Al
2O
3, 1-5% K
2The Na of O, 0.1-0.5%
2The muriate of O, 1-5%, the loss on ignition of 15-25%; Its radionuclide amount meets GB6566-2010 construction main body material radionuclide content index, i.e. I
Ra≤ 1.0B
q/ Kg, I
γ≤ 1.0B
qThe requirement of/Kg (detection method is GB11743-89);
(b) ground granulated blast furnace slag, this slag powders are that the shrend waste residue that iron-smelting blast furnace is discharged is finely ground to powder, are preferably to meet GBFS S95 and/or the S105 that GBT18046-2008 requires;
(c) silicate cement or Portland clinker powder;
(d) unslaked lime or dry hydrate are preferably the grinding that meets JCT479-92 and tail over 10% for building calcareous calcium lime powder that is less than total mass to 80um;
(e) flyash, the dust of discharging in coal-burning power plant's smokestack is preferably the I level and/or the II level F class flyash that meet GB/T1596-2005;
(f) fine sand in gathering materials namely is unreactive aggregate such as river sand and/or mountain sand and/or Desert Sand and/or Gobi desert sand and/or extra large sand and/or CHARACTERISTICS OF TAILINGS SAND and/or the Rock Powder of classification to the requirement of the medium sand that meets the GB/T1468-200 regulation and fine sand;
(2) raw material (a), (b), (c), (d), (e) in the step (1) are hybridly prepared into jelling agent, wherein, the quality percentage composition of each raw material is: the cement of the desulfurization slag of 50-80wt%, the slag powders of 10-35wt%, 2-20wt%, the lime powder of 2-5wt%, the flyash of 5-15wt%;
(3) with in the jelling agent of step (2) gained and the step (1) gather materials and water is uniformly mixed into leather hard, wherein, aggregate quality accounts for the 0-75% of jelling agent and aggregate quality summation, and water cement ratio is that the mass ratio of water and jelling agent powder is 0.10-0.46; Water cement ratio and forming pressure need be complementary, and low water cement ratio is corresponding to high forming pressure usually;
(4) with the mixture mold filling of step (3) gained, then compression moulding, the demoulding with the adobe after the demoulding in 40-90 ℃ of water vapor maintenance 1-7 days, then namely got no-baking bearing brick in moisture-keeping maintaining 0-21 days at normal temperatures; Usually can reach 80% of final strength in steam-cured 3 days.
Further, described compression moulding is adopted hydrostatic profile or is shaken molded; Forming pressure during hydrostatic profile is preferably 3-80MPa.Shake when molded, general shaking is pressed into the shaped brick machine also can satisfy forming requirements.
The present invention has following advantage than prior art: 1. the desulfurization slag volume is large, thereby makes the waste residue utilization rate increase the goods cost; 2. the early strength of goods is large, and curing time is short, can greatly enhance productivity, thereby make goods that better cost performance be arranged; 3. by the lift velocity of steam-cured raising product strength, avoided simultaneously ettringite to postpone generation to the disadvantageous effect of goods longterm strength and weather resistance; 4. a kind of raw material sources of new economy are not only provided for green building material, effectively the disposal and utilization Calcium Sulfite.
Embodiment
The present invention is described in further detail below in conjunction with concrete experiment embodiment.
(1) half dry-pressing hydrostatic profile example: the preparation case process technical parameter of half dry-pressing hydrostatic profile when table 1 is listed in the water cement ratio of 0.1-0.33.Test raw materials used: Calcium Sulfite, this desulfurization slag be canescence to the ecru fines, dispersiveness and good fluidity, median size is 4-10um, the BET specific surface area is 2-10m
2/ g, it consists of: the quality percentage composition is the CaO of 40-50%, the SO of 8-16%
3, 10-18% SO
2, 1-3% TFe, the SiO of 0.2-1.0% of MgO, 1-2%
2, 0.4-0.6% Al
2O
3, 1-5% K
2The Na of O, 0.1-0.5%
2The muriate of O, 1-5%, the loss on ignition of 15-25%, its radionuclide amount meet GB6566-2010 construction main body material radionuclide content index, i.e. I
Ra≤ 1.0B
q/ Kg, I
γ≤ 1.0B
qThe requirement of/Kg (detection method is GB11743-89); The S95 GBFS; 80um tails over 10% the calcium lime powder that is less than total mass; I level F class flyash; The PC32.5 composite Portland cement; The not specified river sand that is the medium sand grade gathers materials.At first, be respectively that the ratio of flyash of lime powder, the 5-15wt% of cement, the 2-5wt% of slag powders, the 2-20wt% of desulfurization slag, the 10-35wt% of 50-80wt% is hybridly prepared into jelling agent according to the quality percentage composition of each raw material.Then, with jelling agent with gather materials and water is uniformly mixed into mold filling behind the mixture of leather hard.The aggregate-to-cement ratio mass ratio with the jelling agent powder that refers to gather materials.Die trial is the punching block of interior empty 125 * 40 * 25mm, and the water chestnut cylinder test block of moulding is of a size of: 125 * 25 * 20～25mm, the test block after the moulding is direct demold.After the demoulding under design temperature airtight steam-cured 7 days again mark support to 28 days, the test block that needs to survey full water ultimate compression strength is soaked front 1 day of survey.The performance data of each example sees Table 2.Ultimate compression strength data in the table 2 are the data of the direct pressurized of single test block, and load face is 125 * 20～25mm.28 days ultimate compression strength of each test block (or more early the ultimate compression strength in the length of time) are 11-47MPa.Each example can satisfy respectively the corresponding requirement of strength of each model heavy-load bearing brick between MU10～MU30, and the softening system number average is greater than 0.8, average out to 1.0, and explanation has excellent water-resistance.The full water-mass density of each test block is 1.9-2.1, baking density 1.7-1.8, and immersion quality half a year is not lost in water, without obviously softening feature yet.
Table 1 half dry-pressing hydrostatic profile example preparation technology parameter
*Not specified gathering materials is the river sand of medium sand grade; The mountain is thin: mountain sand, grade are fine sand; The ore deposit is thin: CHARACTERISTICS OF TAILINGS SAND, grade are fine sand.
(2) standard square production instance: table 3 is listed with brick machine molded standard square (240 * 115 * 53mm) the detection data of shaking.The vibratory compaction full automatic control of brick machine, 56 blocks of standard squares of once shaped, each detects the mean value that data are at least 3 standard squares detection data in the table.Wherein the detection of ultimate compression strength is undertaken by the detection method of non-fired common brick in the GB/T2542-2003 Test methods for wall bricks 7.3.1.3 joint.Test raw materials used: S105 GBFS, 80um tail over 10% dry hydrate, II level F class flyash, the PC32.5 composite Portland cement that is less than total mass, and gathering materials is river sand, and grade is medium sand.Shaking after molded is direct demold.After the demoulding under design temperature airtight steam-cured 5 days first, again sprinkle water at room temperature maintenance to 28 day of overlay film interval.Each example can satisfy respectively the corresponding requirement of strength of each model heavy-load bearing brick between MU10～MU30.
Table 2 half dry-pressing hydrostatic profile example performance
The table 3 molded standard square example that shakes
Claims (2)
1. one kind is utilized the steam-cured method for preparing no-baking bearing brick of semidry desulfurization waste residues, it is characterized in that comprising the step of following order:
(1) prepare following several raw materials:
(a) Calcium Sulfite, this desulfurization slag be canescence to the ecru fines, median size is 4-10um, the BET specific surface area is 2-10m
2/ g; It consists of: the quality percentage composition is the CaO of 40-50%, the SO of 8-16%
3, 10-18% SO
2, 1-3% TFe, the SiO of 0.2-1.0% of MgO, 1-2%
2, 0.4-0.6% Al
2O
3, 1-5% K
2The Na of O, 0.1-0.5%
2The muriate of O, 1-5%, the loss on ignition of 15-25%; Its radionuclide amount meets GB6566-2010 construction main body material radionuclide content index;
(b) ground granulated blast furnace slag, this slag powders are that the shrend waste residue that iron-smelting blast furnace is discharged is finely ground to powder, the GBFS S95 and/or the S105 that require for meeting GBT18046-2008;
(c) silicate cement or Portland clinker powder;
(d) unslaked lime or dry hydrate are for the grinding that meets JCT479-92 tails over 10% for building calcareous calcium lime powder that is less than total mass to 80um;
(e) flyash, the dust of discharging in coal-burning power plant's smokestack is I level and/or the II level F class flyash that meets GB/T1596-2005;
(f) fine sand in gathering materials namely is unreactive aggregate river sand and/or mountain sand and/or Desert Sand and/or Gobi desert sand and/or extra large sand and/or CHARACTERISTICS OF TAILINGS SAND and/or the Rock Powder of classification to the requirement of the medium sand that meets the GB/T1468-200 regulation and fine sand;
(2) desulfurization of raw material slag, slag powders, cement, lime powder, flyash in the step (1) are hybridly prepared into jelling agent, wherein, the quality percentage composition of each raw material is: the cement of the desulfurization slag of 50-80wt%, the slag powders of 10-35wt%, 2-20wt%, the lime powder of 2-5wt%, the flyash of 5-15wt%;
(3) with in the jelling agent of step (2) gained and the step (1) gather materials and water is uniformly mixed into leather hard, wherein, aggregate quality accounts for the 0-75% of jelling agent and aggregate quality summation, water cement ratio is that the mass ratio of water and jelling agent powder is 0.10-0.46;
(4) with the mixture mold filling of step (3) gained, then compression moulding, the demoulding with the adobe after the demoulding in 40-90 ℃ of water vapor maintenance 1-7 days, then namely got no-baking bearing brick in moisture-keeping maintaining 0-21 days at normal temperatures.
2. the steam-cured method for preparing no-baking bearing brick of semidry desulfurization waste residues of utilizing according to claim 1 is characterized in that: described compression moulding is adopted hydrostatic profile or is shaken molded; Forming pressure during hydrostatic profile is preferably 3-80MPa.
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| CN106316326B (en) * | 2016-08-31 | 2019-09-27 | 韩涛 | The method for preparing construction material using desulfurized gypsum |
| CN106365577B (en) * | 2016-08-31 | 2019-04-12 | 韩涛 | The method for preparing construction material using circulating fluid-bed clinker |
| CN106431104B (en) * | 2016-08-31 | 2019-07-02 | 韩涛 | The method for preparing construction material using metallurgical slag |
| CN106630879A (en) * | 2016-12-11 | 2017-05-10 | 雷笑天 | Method for preparing baking-free brick on basis of blast furnace slag |
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| CN110563426B (en) * | 2019-10-21 | 2021-12-21 | 河南城建学院 | Steam-cured high-strength brick prepared from mine salt mud and preparation method thereof |
| CN116462478A (en) * | 2023-04-18 | 2023-07-21 | 申能环境科技有限公司 | Silt autoclaved brick and preparation method thereof |
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| CN102093023B (en) * | 2010-12-27 | 2012-12-05 | 马鞍山钢铁股份有限公司 | Non-fired brick and preparation method thereof |
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