CN104098309A - Composite straw sheet and preparation method thereof - Google Patents
Composite straw sheet and preparation method thereof Download PDFInfo
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- CN104098309A CN104098309A CN201410224643.4A CN201410224643A CN104098309A CN 104098309 A CN104098309 A CN 104098309A CN 201410224643 A CN201410224643 A CN 201410224643A CN 104098309 A CN104098309 A CN 104098309A
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- cement
- composite
- sheet material
- straw
- sulfur aluminate
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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 preparation method of a composite straw sheet. The method includes: increasing the content of sulphate aluminium cement clinker into common sulphate aluminium cement, adding hydraulic calcium oxide as an exciting agent, and conducting blending to form compound sulphoaluminate cement, and bonding the cement with crop straw to obtain the sheet. And the side effects of straw on cement setting and hardening can be overcome. In the method, the straw is not soaked by alkaline water, a chlorine-containing material is unnecessary for modification treatment on straw, wastewater discharge does not exist, heating is not needed, smoke dust and exhaust emission are absent. The advantages of light weight and abundant fiber of crop straw are utilized for low energy consumption and pollution-free preparation of the composite straw sheet.
Description
Technical field
The invention belongs to building material technical field, particularly a kind ofly take composite sulfur aluminate cement as jelling agent, in normal temperature and pressure environment, the composite stalk cement sheet material of preparing with this cement bond agricultural crop straw.
Background technology
For soluble carbohydrate in known agricultural crop straw, the condensing to " hydraulicity " cement such as carbohydrate particularly, sclerosis is fatal harm, is also a unsolved difficult problem so far, so limitation adds the curing cementing stalk of limiting the quantity of of villaumite with " air-setting " magnesium cement and does wallboard always.Its product deformation, water funk, intensity falls back, and the moisture absorption is returned halogen corroding metal object, unfavorable to environment.
At Chinese patent notification number, be separately CN102887691A, the day for announcing is 2013.113, disclose a kind of straw New Type Light-weight Wall Material, its raw material by following weight part is made: flyash 40-50, improved plant straw powder 20-30, aluminosulfate cement 20-30, pearlstone 10-20, silica flour 10-15, modification potter's clay 10-15, glass fibre 10-20, whipping agent 2-4, water reducer 3-6.This method of only having 20～30% modified straw straw-stalk wall material processed with content.Described to stalk modification, be by stalk segment, powder process, enters highly basic water enchroachment (invasion) bubble and a few hours pulls out, and heating desaturation water, reheats oven dry, additional clorafin, the mixing such as Walocel MT 20.000PV, granulation, then Repeat-heating is dried.With modification potter's clay (described modification potter's clay is by potter's clay, diatomite, silane, 60 ℃ of nano silicon heating are uniformly mixed), Repeat-heating is dried powder process.Again with 50% flyash, 20～30% aluminosulfate cements, all the other pearlstones, silica flour, glass, whipping agent, water reducer, appropriate tap water, mixes and stirs and adds mold forming.80 ℃ of vapor cures of just base heating 3 hours, are warmed up to 180 ℃ of high-pressure curings 4 hours, are straw materials for wall.
Be not difficult to find out that the problem that above-mentioned patent exists is: except river sand, clorafin, methylcellulose gum, kaolin, diatomite, nano silicon (even super-fine powder cost is also higher), silane etc., are all more expensive raw materials, increased the cost of manufacture of stalk.Caustic alkali water enchroachment (invasion) bubble for described modified straw powder (actual be mineralising process), thisly processes with strong lye, has both contained caustic soda material in its waste water, has again the refuse of extracting out in stalk, if discharge needs purifying treatment.Facility investment etc., comprehensive cost is high, as direct discharge, environment is polluted again; After stalk is pulled out, through 40-45 ℃ of heating, drying, reach the high ridity of water ratio 2～3%, burn coal heating, soot emissions problem; By oil, gas, its energy consumption of electrically heated, after granulation, dry once again.With 50～60 ℃ of stirrings of the modification heating such as potter's clay, by 60～80 ℃ of steam for first base, be finally heated to 170～180 ℃, and in high heat, under condition of high voltage, maintenance is 2～4 hours, relates to 180 ℃ of steam, must be with high-duty boiler, relate to safety, high energy consumption and exhaust gas emission problem.
Summary of the invention
In order to overcome the defect of above-mentioned prior art, the present invention aims to provide a kind of composite stalk sheet material and preparation method thereof, its objective is in order to realize the cementing excessive agricultural crop straw without any processing, improve the cementing power of cement, and then overcome the interior soluble carbohydrate of organism to hydrated cementitious, condense, the harm of sclerosis; Made composite stalk sheet material formed at normal temp, weight reduction, toughness strengthens.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of preparation method of composite stalk sheet material, it is characterized in that: with the clinker content that increases conventional aluminosulfate cement, and to add hydraulicity calcium oxide be exciting agent, be then mixed into composite sulfur aluminate cement as jelling agent, cementing agricultural crop straw is made.
The grinding fineness of described composite sulfur aluminate cement is 400m than total surface area
2more than/kg.
The raw material weight per-cent of described composite sulfur aluminate cement is: the conventional aluminosulfate cement of finished product is 60%, and the grog of the conventional aluminosulfate cement of increase is 30%, and hydraulicity calcium oxide is 10%.
Described cementation method is:
(1) first water measurement is added in stirrer, start stirring, then add metering composite sulfur aluminate cement, stir;
(2) add metering agricultural crop straw, continue to stir, obtain sheet material slurry;
(3) sheet material slurry is added to die for molding, the demoulding, moisture-keeping maintaining, make composite stalk sheet material.
A composite stalk sheet material, is characterized in that: the raw material of described straw board is composite sulfur aluminate cement and agricultural crop straw; Described composite sulfur aluminate cement is in conventional aluminosulfate cement, increases the content of sulphoaluminate cement clinker, and to add hydraulicity calcium oxide be that exciting agent is mixed.
The weight percent of each raw material of described straw board is: composite sulfur aluminate cement 60%--70%, agricultural crop straw is 30%--40%, and water is that 40～50% (deduction batch is taken a sample test water-retention value) of butt (general name of composite sulfur aluminate cement and agricultural crop straw) batching total amount are metered into;
The weight percent of described each raw material of composite sulfur aluminate cement is: conventional finished product aluminosulfate cement 60%, the sulphoaluminate cement clinker 30% of increase, hydraulicity calcium oxide exciting agent 10%.
Key of the present invention is to increase sulphoaluminate cement clinker and hydraulicity calcium oxide in conventional finished product aluminosulfate cement, improves grinding fineness and is greater than 400m than the table total area
2/ kg.Essential mineral in this cement clinker, anhydrous calcium sulphoaluminate, when gypsum reduces, is excited by additional lime, can within a short period of time the cementing sclerosis of stalk be formed to the hard skeleton of artificial stone.The aluminium glue C-S-H simultaneously separating out and Ca (OH)
2act on, further promote the hydration reaction of β Dicalcium Phosphate (Feed Grade).Obtain early potent fruit, goods 10-15 hour at normal temperatures can the demoulding, within three days, is commodity wallboard.
Above-mentioned composite sulfur aluminate cement is, in 60% aluminosulfate cement, increase the skillful material of 30% this cement, the outer interpolation 10% excited cement active Mineral additive that hardens, form composite sulfur aluminate cement: cement clinker 63% in described composite sulfur aluminate cement, exciting agent (hydraulicity calcium oxide) is 10%.Raw material content is 27% (plaster stone 6% and raw stone flour 21%).Illustrate: the conventional aluminosulfate cement of raw material is brought into, and wherein raw stone flour is Wingdale or assorted stone etc.
The exciting agent of complex cement, hydraulicity calcium oxide includes and burns till mineral and be: calcium oxide, β Dicalcium Phosphate (Feed Grade), monocalcium aluminate, dicalcium ferrite, magnesium oxide etc.
The mineral content of composite sulfur aluminate cement is as follows in sum:
3(CaO Al
2o
3) CaSO
4be 53%, β C
2s is 12%, CaCO
3be 21%, CaSO
4be that 6%, Ca0 is that 5.5%, CA is 1.5%, C
2f is that 0.5%, MgO is 0.5%.Note: the present invention all calculates by weight percentage.
In composite sulfur aluminate cement, the vital role of hydraulicity calcium oxide is that the aquation, the sclerosis that excite excessive grog in this cement are active, and aquation " gel-film " is stablized in quick formation, and stalk dispersion is firmly coated, and tool certain thickness and tension stress intensity.The effectively timely stalk that stops includes the dissolvings such as carbohydrate of the normal sclerosis of harm cement and extracts out.Under the continuation effect of exciting agent, promoted that again ettringite forms fast, made the hypersaturated state elongated needle-like crystal that interweaves, ordered about rapidly by force of cohesion and separate out.Promote crystal aspect to produce larger cohesive force, by the firm cementing sclerosis of stalk, and the stable initial strength of tool.Within 10～15 hours at normal temperatures, can obtain demoulding strength, moisture-keeping maintaining 3～4 days is commodity wallboard.
The present invention is to raw-material requirement:
Require: in the conventional aluminosulfate cement of finished product, clinker mineral content is not less than 55%, raw material mineral are not more than 45% (note: containing plaster stone in raw material is 10%, raw stone flour 35%), and grinding fineness is 400m than the table total area
2/ kg.
Require: in conventional sulphoaluminate cement clinker, " essential mineral ", and anhydrous sulphur calcium contents is that 75%, β Dicalcium Phosphate (Feed Grade) is 20%, all the other 5% are magnesium oxide and free calcium oxide etc.
Require: exciting agent is hydraulicity calcium oxide, mineral content: comprise 55% calcium oxide, β Dicalcium Phosphate (Feed Grade) 20%, monocalcium aluminate is 16%, dicalcium ferrite 6%, all the other 3% left and right are the impurity such as magnesium oxide.Fineness is the same.
Require: stalk is agricultural crop straw, wheat straw, straw, rape straw.Derive from the combining machine tail end of shredder assembly, ejection, collection.Specification is determined by applicable making sheet kind requirement.Do not dewater, not except silt, without modification, direct and cement is mixed altogether.
Require: by batch taking a sample test moisture content of straws, this is very important, is that the accurate-metering that is related to water consumption is not slipped up, and one is pressed, and stalk water content is large, and amount of water reduces, otherwise large.Mixing water relation is mixed and stirred the operability of system and quality product requirement etc.
The present invention has the following advantages:
1, the clinker content that increases conventional aluminosulfate cement for the present invention, and to add hydraulicity calcium oxide be exciting agent, then be mixed into composite sulfur aluminate cement as jelling agent, cementing agricultural crop straw, the method has stoped agricultural crop straw containing the extractum harm hardenings of cement such as wood sugar, tannin and strength development when serious (can never harden), and then overcome the aquation of soluble carbohydrate to cement in organism, and condense, the harm of sclerosis.In cement, add hydraulicity calcium oxide, promoted exciting of grog hydration activity, agricultural crop straw is invaded bubble without buck and is processed, non-wastewater discharge.
2, in preparation method of the present invention, improved the grinding fineness of composite sulfur aluminate cement, object is to meet hydrated cementitious speed, and the carrying out fast of the aquation degree of depth, promotes cementing fast to stalk and strength development.Another object is to meet cement granules, the coated thickness to stalk dispersion.
3, the cementing process in preparation method of the present invention can be found out, its technique is simple, and full making sheet process, does not heat, and completes at normal temperatures; To stalk, do not do modification, non-wastewater discharge, in raw material, without villaumite, goods are nonhygroscopic, halogenation.Do not heat, smoke dust and exhaust gas emission.
4, straw board of the present invention has utilized the cementing stalk of processing without mineralising of composite sulfur aluminate cement, make full use of stalk light, multifilament advantage, improves hardening of cement body from great, the shortcoming of poor toughness, can within a short period of time by the cementing sclerosis of stalk, obtain early potent fruit, goods 10-15 hour can the demoulding, within three days, be commodity wallboard, and prepared sheet material is indeformable, its comprehensive practical index meets industry testing requirement.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
A preparation method for composite stalk sheet material, with the clinker content that increases conventional aluminosulfate cement, and to add hydraulicity calcium oxide be exciting agent, is then mixed into composite sulfur aluminate cement as jelling agent, cementing agricultural crop straw is made.(namely, in the conventional aluminosulfate cement of existing finished product, increase the content of sulphoaluminate cement clinker, then add hydraulicity calcium oxide; Then these three kinds of raw materials are mixed into composite sulfur aluminate cement, and by this composite sulfur aluminate cement as jelling agent, cementing agricultural crop straw, makes composite stalk sheet material.
Need above-mentioned three kinds of raw materials of explanation to be market purchase gained, its grinding fineness is 400m than total surface area
2more than/kg.
The preparation of composite sulfur aluminate cement (weight percent metering):
By 60% conventional aluminosulfate cement, join in agravic dry powder blender with the skillful material 30% of conventional aluminosulfate cement and 10% exciting agent (hydraulicity calcium oxide), start mixing machine, mix 8～10 minutes, blowing packing, warehouse-in.
Making sheet Easy dosing of the present invention, all with butt weight percentage calculation, be that composite sulfur aluminate cement is 60～70%, agricultural crop straw is 30～40%, and water is that 40～50% (deduction batch is taken a sample test water-retention value) of making sheet butt (general name of composite sulfur aluminate cement and agricultural crop straw) batching total amount are metered into.
Prepare composite stalk sheet material embodiment as follows:
Embodiment 1
(1) divide and get (weighing scale): composite sulfur aluminate cement 60%, butt rice straw 40%, water is 50% of butt total amount.
(2) first water measurement is entered in stirrer, start stirring, add metering composite sulfur aluminate cement, stir 1～2 minute, do not shut down;
(3) cement slurry does not add metering stalk under not stopping to stir, and continues to stir 10-13 minute.
(4) to mix and stir system even, soft in range estimation, and the plasticity-that meets the requirements state, is mixing and stirring bottom discharge.
(5) opening baiting valve, in blowing entering plate road guide plate molding machine die, is design specification through automatic parting direction, or by mechanical manipulator by its boarding wire net, or dimensioning fiberglass gridding, imports to and mixes and stirs body instruction position.Making sheet finishes.
(6) enter mold forming, do not shake, under normal temperature condition, static about 8～10 hours, get final product the demoulding.
(7) open pickoff, by stripping manipulator, by product warehousing, in normal temperature environment, moisture-keeping maintaining 3～4 days, is commodity, composite stalk cement sheet material.
Embodiment 2
Compare with embodiment 1, difference is: composite sulfur aluminate cement 65%, and butt rape stalk 35%, water is 45% of formula butt total amount.(operation steps is with embodiment 1)
Embodiment 3
Compare with embodiment 1, difference is: composite sulfur aluminate cement 70%, and butt wheat straw waste 30%, water is 40% of formula butt total amount.(operation steps is with embodiment 1)
Precaution:
Can 1, increasing clinker content, be important technique measure of the present invention, meet and overcome the side effect of stalk to cement.Quality to purchased raw material, need examine through sampling observation, can enter formula.
2, improve grinding fineness, object is to meet hydrated cementitious speed, and the carrying out fast of the aquation degree of depth, promotes cementing fast to stalk and strength development.Another object is to meet cement granules, the coated thickness to stalk dispersion.So fineness will be taken a sample test and be examined, can enter formula.
3, exciting agent, is hydraulicity calcium oxide, and Main Function is excited cement grog hydration activity.Be difficult to difference with air hardening lime in appearance, this is very important, and the present invention is highly sealing in pattern, is isolated with air, is (without the carbonic acid gas effect) of never hardening with air hardening lime.So to purchased lime, need examine after tested and can enter formula.
4, to stalk specification one with 6～10 millimeters of particle diameters, main according to being that sheet material kind determines, by a batch sampling observation water ratio, be necessary.
Claims (7)
1. the preparation method of a composite stalk sheet material, it is characterized in that: with the clinker content that increases conventional aluminosulfate cement, and to add hydraulicity calcium oxide be exciting agent, be then mixed into composite sulfur aluminate cement as jelling agent, cementing agricultural crop straw is made.
2. the preparation method of composite stalk sheet material according to claim 1, is characterized in that: the grinding fineness of described composite sulfur aluminate cement is more than 400 ㎡/kg than total surface area.
3. the preparation method of composite stalk sheet material according to claim 1, it is characterized in that: the raw material weight per-cent of described composite sulfur aluminate cement is: conventional finished product aluminosulfate cement is 60%, the grog of the conventional aluminosulfate cement increasing is 30%, and hydraulicity calcium oxide is 10%.
4. the preparation method of composite stalk sheet material according to claim 1, is characterized in that: described cementation method is:
(1) first water measurement is added in stirrer, start stirring, then add metering composite sulfur aluminate cement, stir;
(2) add metering agricultural crop straw, continue to stir, obtain sheet material slurry;
(3) sheet material slurry is added to die for molding, the demoulding, moisture-keeping maintaining, make composite stalk sheet material.
5. a composite stalk sheet material, is characterized in that: the raw material of described straw board is composite sulfur aluminate cement and agricultural crop straw; Described composite sulfur aluminate cement is in conventional aluminosulfate cement, increases the content of conventional sulphoaluminate cement clinker, and to add hydraulicity calcium oxide be that exciting agent is mixed.
6. a kind of composite stalk sheet material according to claim 5, is characterized in that: the weight percent of each raw material of described straw board is: composite sulfur aluminate cement 60%--70%, agricultural crop straw is 30%--40%.
7. a kind of composite stalk sheet material according to claim 5, it is characterized in that: the weight percent of described each raw material of composite sulfur aluminate cement is: finished product is commonly used aluminosulfate cement 60%, the sulphoaluminate cement clinker 30% increasing, hydraulicity calcium oxide is exciting agent 10%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105696726A (en) * | 2016-03-23 | 2016-06-22 | 哈尔滨展大科技有限责任公司 | Net wall structure provided with straw bricks |
| CN106675066A (en) * | 2016-12-28 | 2017-05-17 | 成都瑞吉星化工有限责任公司 | Environment-friendly flame-retardant straw-based plate for buildings and preparation method of environment-friendly flame-retardant straw-based plate |
| CN109650755A (en) * | 2019-01-18 | 2019-04-19 | 中国建筑材料科学研究总院有限公司 | High alkalinity sulphate aluminium cement of sulfur acid calcium and preparation method thereof |
| CN110776301A (en) * | 2019-11-28 | 2020-02-11 | 席宗隆 | Microwave modified inorganic cementing material, preparation method and application thereof |
| CN115745545A (en) * | 2022-11-30 | 2023-03-07 | 四川什邡国正环保科技有限公司 | Fireproof door filling material and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201700078844A1 (en) * | 2017-08-25 | 2019-02-25 | Michele Artuso | Straw brick and lime and its construction process. |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105696726A (en) * | 2016-03-23 | 2016-06-22 | 哈尔滨展大科技有限责任公司 | Net wall structure provided with straw bricks |
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| CN109650755A (en) * | 2019-01-18 | 2019-04-19 | 中国建筑材料科学研究总院有限公司 | High alkalinity sulphate aluminium cement of sulfur acid calcium and preparation method thereof |
| CN109650755B (en) * | 2019-01-18 | 2023-01-06 | 中国建筑材料科学研究总院有限公司 | High-alkalinity sulphate aluminium cement containing calcium sulphate and preparation method thereof |
| CN110776301A (en) * | 2019-11-28 | 2020-02-11 | 席宗隆 | Microwave modified inorganic cementing material, preparation method and application thereof |
| CN115745545A (en) * | 2022-11-30 | 2023-03-07 | 四川什邡国正环保科技有限公司 | Fireproof door filling material and preparation method thereof |
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| CN104098309B (en) | 2017-02-08 |
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Effective date of registration: 20211126 Address after: 618400 Shifang City Economic Development Zone, Deyang, Sichuan (North District) Patentee after: Sichuan Shifang Guo Zheng Environmental Protection Technology Co.,Ltd. Address before: 621600 group 3, Baoan village, Sanyuan Township, Yanting County, Mianyang City, Sichuan Province Patentee before: Zhang Fengyang |