CN106631120A - Straw-fiber and shale sintered microporous material and preparation method thereof - Google Patents

Straw-fiber and shale sintered microporous material and preparation method thereof Download PDF

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Publication number
CN106631120A
CN106631120A CN201611261168.3A CN201611261168A CN106631120A CN 106631120 A CN106631120 A CN 106631120A CN 201611261168 A CN201611261168 A CN 201611261168A CN 106631120 A CN106631120 A CN 106631120A
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CN
China
Prior art keywords
shale
powder
straw
stalk fibre
dry
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CN201611261168.3A
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Chinese (zh)
Inventor
陈国平
梁旭东
马立
郑兵
石建军
唐宗举
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SICHUAN XINHUAYUAN ART FIELD
Southwest University of Science and Technology
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SICHUAN XINHUAYUAN ART FIELD
Southwest University of Science and Technology
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Priority to CN201611261168.3A priority Critical patent/CN106631120A/en
Publication of CN106631120A publication Critical patent/CN106631120A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00Clay-wares
    • C04B33/02Preparing or treating the raw materials individually or as batches
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00Clay-wares
    • C04B33/32Burning methods
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06Porous 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
    • C04B38/063Preparing or treating the raw materials individually or as batches
    • C04B38/0635Compounding ingredients
    • C04B38/0645Burnable, meltable, sublimable materials
    • C04B38/0675Vegetable refuse; Cellulosic materials, e.g. wood chips, cork, peat, paper
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656Aspects 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
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74Physical characteristics
    • C04B2235/77Density
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607Thermal properties, e.g. thermal expansion coefficient

Abstract

The invention discloses a straw-fiber and shale sintered microporous material and a preparation method thereof. The straw-fiber and shale sintered microporous material is formed by using 88 to 93 parts (by weight) of shale powder and 7 to 12 parts (by weight) of straw fiber powder, humidifying and mixing the shale powder and the straw fiber powder, carrying out compression molding forming on an obtained mixture, then drying the mixture and afterwards sintering the mixture, and is mainly used as a filling building block of a nonbearing wall; the performance of the material is that the water absorption all reaches 15 percent or above, the apparent porosity reaches 27 percent or above, and the heat conductivity coefficient at a normal temperature is not more than 0.40W/(m*K) to 0.50W/(m*K); the material has excellent heat-insulation and sound-insulation performance, is light in weight, has the density which is only 1,494/(kg/*m<-3>) to 1,733/(kg/*m<-3>), can be used for lightening the weight of a building by a wide margin, is high in strength, has the average compression strength of 20MPa to 30MPa, and not only can be used as a filling wall, but also meets the use requirement of a bearing brick.

Description

Sintered microporous material of stalk fibre shale and preparation method thereof
Technical field
The invention belongs to building materials technology field, is related to sintered microporous material of a kind of stalk fibre shale and preparation method thereof.
Background technology
As Urbanization in China is accelerated, high buildings and large mansions are built rapidly, need a large amount of lightweights, heat-insulated, sound insulation filling Material.Traditional clay brick matter weight, heat-insulated, sound insulation value is poor, does not meet use requirement, and rushes with Territorial management regulation It is prominent, production has been strictly limited.Therefore, many people begin one's study new alternative materials, for example:
Gao Benli et al. replaces part shale, mine tailing addition content to reach total thing from the mine tailing of meishan iron mine as main admixture The 50% of material, the shale mine tailing self-heat conserving porous brick developed, by carrying out physical and mechanical property, binding masonry wall antidetonation to it The aspects such as performance are tested, and the masonry compression strength of shale mine tailing self-heat conserving porous brick, shearing strength and elastic modelling quantity are more than The specification setting of common porous brick setting corresponding index.
Thank and improve oneself et al. on the basis of common oscillation, it is newly developed go out a kind of hole is more, thermal conductivity factor is low, intensity Higher grade energy-saving sintering shale hollow brick, it is found that newly developed energy-saving sintering shale hollow brick is that one kind has guarantor The novel wall material of warm heat insulating function.
Xu Zifang et al. adopts flyash and gangue for main material roasting solid wall insulating brick at low temperature, this The compression strength of brick reaches 32.9MPa, and thermal conductivity factor is 0.405W/ (mK), while being capable of the spy such as acidproof, alkaline-resisting, freeze-thawing resistant Point.
Zhang San is bright et al. using the raw material production insulating brick such as discarded gangue, by hole ratio, the pass extremely side of arrangement Formula etc. is optimized, and improves the thermal property of insulating brick.
On the one hand Zhou Zhimin et al. by mixing granules of polystyrene in concrete, reduces the heat conduction of brickmaking concrete Coefficient;On the other hand its arrangement mode is arranged with wrong by determining the air space row in brick internal vertical heat transfer direction, is prolonged as far as possible Heat transfer route has been grown, the thermal resistance of self-heat conserving porous brick has at utmost been improve.This light aggregate concrete developed is certainly Thermal insulation porous bricks, the application effect in Practical Project is very good.
Cai Jinwu[Et al. investigated a kind of sintering hollow insulating brick, the body of wall that this insulating brick is built into is in cold district Energy-conservation 50% is can reach by the heat-insulating property of itself to require, without the need for separately adding heat-insulation layer;And without the need for special work in engineer applied Skill is constructed, and is easy to quality control;Meanwhile, cost is less than other heat-preserving walls, can use with the life-span with building, safe and reliable, Have a extensive future.
Ma Cuifen et al. is by the conductivity of heat to a kind of and load-bearing, the novel energy-conserving porous brick masonry of heat insulating functions Block mode, wall inclination etc., can be organized to be studied, the masonry is compared than conventional outer wall heat-insulation system, with heat-insulation layer and building The advantages of thing same life-span, heat-insulating property reliability, easy construction, cost reduces about 30%.
Li Jiancheng et al. has been carried out greatly using FInite Element to the thermal resistance value of different size, the concrete hollow block of pass Amount is calculated, and points out that impact of the row of hole to building block thermal resistance value is maximum, and proposes that " many rounds, thin hole wall " can be used as heat-insulated sky The criterion of heart building block Thermal Design.
Ma Baoguo et al. have studied impact of the pore creating material of several different pore formation mechanisms to flyash, shale fired brick performance, As a result find that mineral internal combustion pore creating material can release energy at high temperature, promote burning till for test specimen, the percent of firing shrinkage of test specimen is high, Compression strength loss rate is low by 44.7%, and the porosity of test specimen is low, bulk density is high.Endothermic decomposition under heat decomposition type pore creating material high temperature, Burning till for test specimen shrinks size control effect preferably, and the intensity of product is relatively low, and the porosity is higher than other two groups of samples, bulk density Value is minimum.Biomass pore creating material can provide energy in sintering process for test specimen, but due to the flaw size for being formed it is big, volume Volume ratio is that the loss of strength rate of 10% test specimen is maximum, reaches 69.5%.
At present, although some enterprises using gangue, coal ash for manufacturing for porous brick, hollow brick, in its heat-insulating property side What is considered on the great majority of face is that it is incubated using insulation material, seldom considers its self-heat conserving performance, domestic experts and scholars Brick body micropore hole creating technology is just started in recent years, so commercially there is the microporous brick of self-insurance temperature function substantially very It is few.
On the other hand, environmental regulation has forbidden Burning Straws, and the substantial amounts of agricultural crop straw in rural area is hopeless, burns Burn stalk phenomenon still frequently to occur, tire out and prohibit more than, become problem demanding prompt solution.
The content of the invention
For problem above, the present invention provides sintered microporous material of a kind of stalk fibre shale and preparation method thereof.Both may be used Lightweight, heat-insulated, sound insulation packing material are produced, the demand of urban construction is met, and an outlet are found for agricultural crop straw, Crop straw burning phenomenon is avoided to occur.Its technical solution is:
A kind of sintered microporous material of stalk fibre shale, is formed with the raw material mixed sintering of following weight portion:
Shale powder 88-93 part
Stalk fibre powder 7-12 parts
Appropriate amount of water
The particle diameter of the shale powder is less than 2.0mm;
The mesh of particle diameter 20~80 of the stalk fibre powder.
The preparation method of the sintered microporous material of above-mentioned stalk fibre shale, including step:
1st, get the raw materials ready
- powder of straw
(1)Dry agricultural crop straw is cut into into the segment less than 30mm, first will be smash as filamentous with beater grinder, then use ball Grinding machine is processed into powder particle shape stalk fibre, and is positioned under natural environment dry;
(2)Dried stalk fibre is sieved using the square hole screen of 20~80 mesh/mesh, acquisition particle diameter is 20~80 mesh Stalk fibre;
- shale powder
Shale is crushed with pulverizer, then slate flour particle is sieved with standard screen, obtained particle diameter and be less than 2.0mm Shale particle;
2nd, pug is made
(1)Powder of straw, shale powder are taken by proportioning and 5~30s are stirred in mixer, be well mixed,
(2)Slowly add water again 1~3min of stirring, be obtained pug, moisture addition in order to blank extrude, it is closely knit, be molded, avoid Moisture is extruded as principle;
3rd, blank is suppressed
(1)Pug is squeezed into into material base with extruder, the physical dimension of material base is determined by mould;Squeeze pressure 10MPa~ 20MPa, and maintain pressure time 30s~60s;
(2)The material base of shaping is placed in drying box, with 105 ± 5 DEG C of freeze-day with constant temperature 24h~48h, the moisture content for controlling base substrate exists Less than 5%;
4th, dried material base is placed in kiln and is sintered, roasting technique system is as follows:
- dry body was preheated through 8~12 hours(Low temperature, high temperature)After temperature reaches 800 DEG C, through the roasting of 3~4 hours, temperature For 850~1050 DEG C, then through the insulation of 3~4 hours, then environment temperature is naturally cooled to stove;Or
- dry body reached 350 DEG C~400 DEG C through 4~5 hours preheating temperatures, through the insulation of 2 hours, was further continued for being warmed up to 850~1050 DEG C and 1~2 hour is incubated, then with stove natural cooling about 12 hours to environment temperature.
Beneficial effects of the present invention:
With the sintered microporous material of stalk fibre shale obtained in above-mentioned raw materials and technique, Jing tests, water absorption rate reach 15% with On, apparent porosity reaches more than 27%.Find that it is equally distributed micro- that burned brick base substrate has been internally formed certain amount through detection Hole, thermal conductivity factor is not more than 0.40~0.50W/ (mK) under normal temperature, so as to reach the purpose of reinforcing material insulation, and And, its mean compressive strength is in 20~30MPa, (kg/m of density 1494~1733/-3), meet GB26538-2011《Sintering is protected Warm brick and insulation blocks》In intensity requirement, not only can as filling wall use, also meet in intensity bearing bricks use will Ask.
Description of the drawings
Fig. 1 is the process chart of the present invention.
Specific embodiment
Referring to Fig. 1, the preparation method of the sintered microporous material of this stalk fibre shale, comprise the steps:
1st, get the raw materials ready
- powder of straw
(1)Dry agricultural crop straw is cut into into the segment less than 30mm, first will be smash as filamentous with beater grinder, then use ball Grinding machine is processed into powder particle shape stalk fibre, and is positioned under natural environment dry;
(2)Dried stalk fibre is sieved using the square hole screen of 20~80 mesh/mesh, acquisition particle diameter is 20~80 mesh Stalk fibre;
- shale powder
Shale is crushed with pulverizer, then slate flour particle is sieved with standard screen, obtained particle diameter and be less than 2.0mm Shale particle;
2nd, pug is made
(1)Powder of straw, shale powder are taken by proportioning and 5~30s are stirred in mixer, be well mixed,
(2)Slowly add water again 1~3min of stirring, be obtained pug, moisture addition in order to blank extrude, it is closely knit, be molded, avoid Moisture is extruded as principle;
3rd, blank is suppressed
(1)Pug is squeezed into into material base with extruder, the physical dimension of material base is determined by mould;Squeeze pressure 10MPa~ 20MPa, and maintain pressure time 30s~60s;
(2)The material base of shaping is placed in drying box, with 105 ± 5 DEG C of freeze-day with constant temperature 24h~48h, the moisture content for controlling base substrate exists Less than 5%;
4th, dried material base is placed in kiln and is sintered, roasting technique system is as follows:
After-dry blank kiln loading, firing up reaches 800 DEG C in 8~12 hours, and dry body is preheated, then is warming up to 850~1050 DEG C, then insulation roasting 3~4 hours stops working, and with stove environment temperature is naturally cooled to;Or
After-dry blank kiln loading, firing up reaches 350 DEG C~400 DEG C for 4~5 hours, and dry body is preheated, then is warming up to 850 ~1050 DEG C, then insulation roasting 1~2 hour stops working, and with stove environment temperature is naturally cooled to.
With the sintered microporous material of stalk fibre shale obtained in above-mentioned raw materials and technique, Jing tests, water absorption rate reach 15% with On, apparent porosity reaches more than 27%.Find that it is equally distributed micro- that burned brick base substrate has been internally formed certain amount through detection Hole, thermal conductivity factor is not more than 0.40~0.50W/ (mK) under normal temperature, so as to reach the purpose of reinforcing material insulation, and And, its mean compressive strength is in 20~30MPa, (kg/m of density 1494~1733/-3), meet GB26538-2011《Sintering is protected Warm brick and insulation blocks》In intensity requirement, not only can as filling wall use, also meet in intensity bearing bricks use will Ask.The material is contrasted with existing clay standard brick, there is following advantage:
1st, production aspect
Energy-conservation, material-saving, low cost.The sintered microporous brick of shale compares the solid clay brick of same volume and can save soil about 10%~30%. Economize on coal about 20%~40%.Due to the reduction of the sintered microporous brick weight of shale, so as to improve the efficiency of adobe shipment and kiln discharge, greatly It is big to reduce production cost, minimize transport costs 15%~20%.The process to agricultural stalk the like waste is realized, energy-saving ring is reached The effect of guarantor, protecting ecology balance, realizes sustainable production.
2nd, construction aspect
1. without the need for outside body of wall(It is interior)Do heat-insulation layer in side.The sintered microporous brick of shale is used for doing the body of wall of building can cause it certainly Body just has thermal and insulating performance, without the need for applying heat-insulation layer, and the service life of sintering shale brick on the inside or outside of body of wall Considerably beyond 70 years, it is ensured that heat insulation effect and building same life-span, need to carry out more after overcoming the interior external thermal insulation several years The major hidden danger of new maintenance;And effectively prevent traditional brick external(It is interior)Side do heat-insulation layer, do crack resist at mortar cracking, Quality problems and the safety problem such as permeate, come off, reducing secondary transformation and multiple maintenance cost
2. the sintered microporous brick brick body lightweight of shale, compares clay brick quality reduction by 20%~40%, intensity decreases 5~15%, for doing Body of wall makes its deadweight reduce about 10%~30%, and foundation load is reduced, and construction cost cost reduces about 5%~8%, effectively solves The problem of the increase house load of heat-insulation layer presence is done in conventional hollow building block.
3rd, use
The sintered microporous brick thermal conductivity factor of shale is not more than 0.40~0.50W/ (mK), compares that solid brick is relatively low, therefore body of wall is exhausted Edge effect is better than solid clay brick body of wall, and heat insulating effect is that this can reduce using and expense for heating and air-conditioning equipment significantly With while the discharge capacity of pernicious gas can be reduced accordingly.

Claims (2)

1. a kind of sintered microporous material of stalk fibre shale, is formed with the raw material mixed sintering of following weight portion:
Shale powder 88-93 part
Stalk fibre powder 7-12 parts
Appropriate amount of water
The particle diameter of the shale powder is less than 2.0mm;
The mesh of particle diameter 20~80 of the stalk fibre powder.
2. the preparation method of the sintered microporous material of stalk fibre shale described in claim 1, including step:
First, get the raw materials ready
- powder of straw
(1)Dry agricultural crop straw is cut into into the segment less than 30mm, first will be smash as filamentous with beater grinder, then use ball Grinding machine is processed into powder particle shape stalk fibre, and is positioned under natural environment dry;
(2)Dried stalk fibre is sieved using the square hole screen of 20~80 mesh/mesh, acquisition particle diameter is 20~80 mesh Stalk fibre;
- shale powder
Shale is crushed with pulverizer, then slate flour particle is sieved with standard screen, obtained particle diameter and be less than 2.0mm Shale particle;
2nd, pug is made
(1)Powder of straw, shale powder are taken by proportioning and 5~30s are stirred in mixer, be well mixed,
(2)Slowly add water again 1~3min of stirring, be obtained pug, moisture addition in order to blank extrude, it is closely knit, be molded, avoid Moisture is extruded as principle;
3rd, blank is suppressed
(1)Pug is squeezed into into material base with extruder, the physical dimension of material base is determined by mould;Squeeze pressure 10MPa~ 20MPa, and maintain pressure time 30s~60s;
(2)The material base of shaping is placed in drying box, with 105 ± 5 DEG C of freeze-day with constant temperature 24h~48h, the moisture content for controlling base substrate exists Less than 5%;
4th, dried material base is placed in stove and is sintered, roasting technique is as follows:
After-dry blank kiln loading, firing up reaches 800 DEG C in 8~12 hours, and dry body is preheated, then is warming up to 850~1050 DEG C, then insulation roasting 3~4 hours stops working, and with stove environment temperature is naturally cooled to;Or
After-dry blank kiln loading, firing up reaches 350 DEG C~400 DEG C for 4~5 hours, and dry body is preheated, then is warming up to 850 ~1050 DEG C, then insulation roasting 1~2 hour stops working, and with stove environment temperature is naturally cooled to.
CN201611261168.3A 2016-12-30 2016-12-30 Straw-fiber and shale sintered microporous material and preparation method thereof Pending CN106631120A (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107602144A (en) * 2017-08-31 2018-01-19 常州欧康铭化工有限公司 A kind of light thermal-insulation aggregate processing method
CN111099916A (en) * 2019-03-14 2020-05-05 西安煤科动力科技有限公司 Microporous light sintered brick and preparation method thereof
CN113912418A (en) * 2021-12-02 2022-01-11 安徽创新秸秆利用有限公司 High-strength porous shale brick sintered by modified straw and preparation method thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107602144A (en) * 2017-08-31 2018-01-19 常州欧康铭化工有限公司 A kind of light thermal-insulation aggregate processing method
CN111099916A (en) * 2019-03-14 2020-05-05 西安煤科动力科技有限公司 Microporous light sintered brick and preparation method thereof
CN113912418A (en) * 2021-12-02 2022-01-11 安徽创新秸秆利用有限公司 High-strength porous shale brick sintered by modified straw and preparation method thereof

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Application publication date: 20170510