CN1280228C - Full fly ash building brick and its manufacturing method and special additive - Google Patents
Full fly ash building brick and its manufacturing method and special additive Download PDFInfo
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Abstract
The present invention relates to a full fly ash building brick and a manufacturing method and a special additive thereof. The full fly ash building brick contains 90 to 96%(weight) of fly ash and 4 to 10%(weight) of compound additive. The manufacturing method comprises the technology of two-step aging and two-step rolling. The compound additive comprises water glass, basic oxide or other basic substances, bentonite or a similar substance and iron oxide. Fly ash content in the high fly ash mixing quantity building brick and the manufacturing method and the special additive of the brick of the present invention is high, and a clay additive is not used at all. The present invention has simple technology, short time and low cost. The manufacturing method of the additive has the advantages of simplicity, wide raw material sources and low cost. The produced fly ash brick has high strength and beautiful appearance and can meet the quality requirement of a load bearing brick of an outer wall.
Description
Technical field
The present invention relates to a kind of flyash that uses and be the building brick of raw material and the additive of manufacture method and this building brick special use of production thereof.
Background technology
Utilize flyash to be the existing many mature technologies of raw material production building brick, but the most volumes of the flyash brick of prior art are all lower, generally be no more than 40%, all the other raw materials adopt the high-ductility tonerde more, or clay matter coal gangue through pulverizing or grapholith (through pulverizing), have plenty of above-mentioned raw materials and all it is arranged.Its production technique is based on wet production, and promptly amount of water is more than 20%, extrusion under vacuum.Its plasticity index that requires blank must adopt a series of big power-equipments greater than 7 for this reason, stirs processing requirements such as pinching mud to adapt to raw materials pretreatment.Therefore, in facility investment, take substantial contribution, simultaneously also brought the product power consumption many, the inevitable outcome that product cost is high, thereby this product is difficult to obtain the market approval, is not enough to compete with clay brick.The second, the above-mentioned raw materials proportioning still needs a large amount of clay materials, has not both met country about protecting farmland and natural, ecological and materials for wall reform policies, can not really reach the requirement that flyash is administered.The 3rd, the most undercapacities of existing flyash brick be to use as the partition material brick in large quantities, and country are taked to limit after the clay brick policy at present, and the market low-rise building needs new bearing wall to come the instead of clay brick with brick.
Chinese patent 02129387.2 discloses a kind of " sintered building brick with high flyash mixing amount and preparation method thereof ", its doping quantity of fly ash can be up to the 85-95 weight part, and all the other are sodium base bentonite and the property-modifying additive be made up of magnesium sulfide, ferric oxide, iron protoxide.Precentagewise conversion, the high-content of its flyash can only reach 86.36%, and more expensive sodium bentonite and the property-modifying additive of price is at least 13.64%, its cost of goods manufactured is obviously higher, is difficult to base oneself upon in market.In addition, this flyash brick production method adopts wet production, water content reaches 18-22%, compound must be adopted big power to pinch mud pre-treatment and extruding cutting blank-making technology, the investment of this kind equipment is all bigger, and energy consumption is very high, and brick making cost is also higher, be difficult to promote on a large scale, its product is also lacked competitiveness.And because its water content is big, must increase time of drying, even warm air drying is also wanted 8-14 hour usually.The 3rd and since flyash basic composition is silicon-dioxide and aluminium sesquioxide microballon, the two itself all has higher hardness, rolls by ordinary process to be difficult to most of microballon is pulverized.The existence of a large amount of microballons directly influences the intensity of finished bricks.
Chinese patent 91110966.8 disclosed a kind of " flyash brick and production technique ", the flyash content of this flyash brick can reach more than 95%, and the water glass of all the other 3-5% is as caking agent, and the deficiency of its existence is that water glass content is too high.Existing market water glass price is 700 yuan one ton, calculates by fusion 5%, and the water glass cost of amounting to every standard brick is 0.07 yuan, very nearly the same with the clay brick price of existing market, add other cost, the cost of every brick is about 0.15 yuan, makes market be difficult to bear.In addition, the complex manufacturing of this brick of flyash composition of this brick, the time is longer, and its time of drying is longer, under artificial environment, utilizes drying medium to carry out drying, still needs 36-48 hour.Roasting time is about 17-20 hour, and temperature needs staged to improve in the roasting process, and its process control is difficult for grasping the difficult quality guarantee of brick.
Summary of the invention
The present invention is directed to the deficiency that above-mentioned prior art exists, developed a kind of made from full fly ash building brick and manufacture method and specialist additive, improved the production method of existing flyash brick.Doping quantity of fly ash is big in the high doping quantity of fly ash building brick of the present invention, and production technique is simple, and cost is low.Production technique required equipment of the present invention is simple, less investment, and the cycle of founding the factory is short.Specialist additive raw material sources of the present invention are extensive, and price is low, can reduce production costs greatly, shorten the production cycle, and reduce the total cost of product effectively, have higher economical, societal benefits.
Fly ash building brick of the present invention, the flyash that contains 90-96wt%, surplus is an additive, described additive is the composite additive that contains water glass, it is characterized in that also having alkaline matter, wilkinite or refractory mortar or Mierocrystalline cellulose and ferriferous oxide in this composite additive composition, described alkaline matter comprises basic oxide or oxyhydroxide or carbonate normal salt, and wherein, alkaline matter content is 30-60wt%; Wilkinite or refractory mortar or content of cellulose are 10-40wt%; Water glass content is 5-10wt%; Described ferriferous oxide content is 10-40wt%.
Above-mentioned fly ash building is lime powder, wherein CaO 〉=60wt% with the basic oxide in the brick; Described oxyhydroxide is NaOH; Described carbonate normal salt is Na
2CO
3
Described fly ash building brick, wherein said oxyhydroxide are the NaOH in papermaking wastewater or other alkaline waste liquor, and described carbonate normal salt is the Na in the native alkali
2CO
3
A kind of method of making above-mentioned fly ash building with brick comprises the steps:
A, get the raw materials ready, the flyash of getting 90-96wt% is in agitator;
B, join additive, get composite additive 4-10wt%, and add the water that is equivalent to the heavy 10-12% of flyash siccative, water temperature fully stirs hydrolysis more than 60 ℃;
C, stirring mix flyash and powerful the stirring with the hydrolysis composite additive, make it thorough mixing;
D, blank ageing, the blank after the stirring are heated and are left standstill one hour;
E, blank roll, and the blank after the ageing was rolled 3-10 minute continuously with wheel roller;
F, the ageing of blank secondary are heated the blank that rolls and are left standstill one hour;
G, blank secondary roll, and the blank that the secondary ageing is good rolled 2-5 minute with mixing pan again;
H, moulding, the blank moulding after secondary rolled;
I, drying make the adobe water ratio less than 6%;
J, the kiln roasting is gone in dried adobe, and kiln temperature keeps constant temperature 2 hours when rising to 1000 ± 50 ℃, then temperature is reduced to gradually kiln discharge behind the normal temperature.
A kind of specialist additive of producing fly ash building with brick contains water glass, it is characterized in that also having alkaline matter, bentonite or refractory mortar or Mierocrystalline cellulose and ferriferous oxide, and described water glass content is 5-10wt%; Described alkaline matter is a calcium oxide, and its content is 30-60wt%, or the yellow soda ash or the sodium hydroxide of equivalence; Described wilkinite or refractory mortar or content of cellulose are 10-40wt%; Described ferriferous oxide content is 10-40wt%.
Above-mentioned production fly ash building is with the specialist additive of brick, and described calcium oxide is taken from lime powder, CaO 〉=60wt% wherein, and described yellow soda ash is taken from native alkali, and described sodium hydroxide is taken from papermaking wastewater or other alkaline waste liquor.
The above-mentioned production fly ash building specialist additive of brick, the content of wherein said water glass is 6-8wt%; The content of described calcium oxide is that 35-55wt% or major ingredient are Na
2CO
3Equivalent native alkali or the equivalence papermaking wastewater, its effective ingredient is NaOH; Described bentonitic content is 15-30wt%; The content of described ferriferous oxide is 10-30wt%.
The fly ash building specialist additive of brick, wherein ferriferous oxide is iron protoxide or ferric oxide.
Made from full fly ash building brick of the present invention, because doping quantity of fly ash can reach more than 95%, and make additive without clay substantially, both can save a large amount of arable lands, and increased the flyash consumption, a brick field of producing 6000 ten thousand standard bricks per year, year is used 130,000 tons of flyash, is equivalent to the year flyash quantum of output of a Generator Set.The quality of made from full fly ash building brick of the present invention is higher, satisfies the requirement of national standard about heavy-load bearing brick for building fully, and it detects data and sees Table 1.
Made from full fly ash building brick qualitative data comparison sheet 1
| Ultimate compression strength | Do folding intensity | Freeze thawing | Scale error | Visual appearance | Lime blowing | Color | |
| Unit | Mpa | Mpa | 15 times | ±mm | |||
| GB | 10 | - | 15 | 3 | Corner angle clearly demarcated six bright and clean | - | - |
| The present invention | ≥15 | ≥4 | Qualified | 2 | Corner angle clearly demarcated six bright and clean | Premium grads | Light red |
In addition, made from full fly ash building brick of the present invention has also reduced transportation cost owing to need not add clay fully.And the additive usage quantity is less and major ingredient is common lime powder, and cost is lower, therefore, makes whole cost descend significantly, every brick cost≤0.08 yuan.Can satisfy the needs of present instead of clay brick, also can be used as partition block and use as heavy-load bearing brick for building.
The manufacture method of made from full fly ash composition brick of the present invention, because amount of water is less, the 10-12% that has only the siccative gross weight, belong to half-dried material brickmaking, save big power and pinched mud pre-processing device and extruding cutting shaping equipment, can save a large amount of facility investments and reduce power consumption cost consuming time in the brickmaking process, a brick field of producing 6000 ten thousand standard bricks per year, the not enough 300KW of production installed capacity.More existing coal ash sintering brick factory reduces 45-75%, and every brick only power consumption cost can reduce 1.5-2.5 and divides money.The investment of founding the factory can reduce 30-85%.And, because amount of water is few, has also shortened time of drying and sintering time, thereby can reduce comprehensive cost effectively.
Second, brick-making method adding of the present invention contains alkaline additive flyash is carried out the alkali activation, and blank adopted twice ageing, help to make fly ash grain softening and easily broken when rolling, the flyash surface is fully contacted with composite additive, its alkali activating reaction carries out more thorough, has formed the flyash of gel state and the mixture of additive.Help base and sintering, reduced system embryo and sintering time and reduced sintering temperature.
The 3rd, adopt and roll for twice, the spherical powder coal ash particle is broken as far as possible, form irregular microparticle, help these particulate and combine closely, more closely knit when making moulding.In addition, flyash is fully combined with composite additive, the surface forms the gel state compound, is beneficial to the intensity of moulding and raising finished bricks.
Composite additive of the present invention, based on lime powder (CaO), its cost very low (, also having environmental benefit) as just lower with native alkali or papermaking wastewater.Because its genus is compound, the comprehensive action of each composition is to have reduced production cost under the prerequisite that improves the flyash brick quality, thereby its mixed economy, social benefit are very obvious.Help applying on a large scale.
Because additive of the present invention is an alkaline substance, it has ramollescence for silicate granules in the flyash and aluminate pellets, help the fragmentation of this two classes material, and can form the gel state material, help improving the bonding strength of brick and the moulding of brick with the above-mentioned substance surface.
Use wilkinite can improve the wet tenacity of brick, the yield rate of raising brick reduces cost.Not only cost was lower when mud was given up in the use of particularly having ready conditions, and had tangible environmental protection and social benefit.
Can improve the dry strength of brick behind the interpolation water glass effectively.And water glass herein can also add the mixture replacing of caustic soda with the useless flour of milling plant.Cost is lower.
Adopt additive of the present invention, improved the ratio of flyash in brick greatly, bring up to 95% even higher by the present generally 45-86% of ratio.Flyash pollutes, changing waste into valuable provides feasible technical scheme in order thoroughly to solve.
Composite additive of the present invention all is a low melting point, it mixes with flyash and fully contacts after rolling, reduced the sintering temperature of flyash brick effectively, generally be no more than 1000 ℃ of kiln temperature, so, use the annular kiln of existing brickmaking can satisfy processing requirement, the high temperature resistant special kiln that need not use refractory brick to build by laying bricks or stones carries out sintering.
Embodiment
Made from full fly ash building brick and production method thereof are selected materials as follows and are prepared;
At first produce composite additive, get 60 parts of lime powders (CaO 〉=60%) by percent by weight, 20 parts of wilkinites, 6 parts of water glass, 14 parts of ferrous oxide powder, above material mixing is pulverized the back screening and is got about granularity 200 orders, preferably less than 200 order powders.
Get 5 tons of above-mentioned composite additives, 95 tons of fly ash in electric power plant are standby.
Other gets 8-10 ton water (8 tons of winters, 10 tons of summers) and is heated to more than 60 ℃, and winter, water temperature can be heated to 70-80 ℃.Composite additive is put into water, fully stir about 5-10 minute.Make additive slurry.
Additive slurry and standby powdered coal ash are gone into stirrer mix stirring 5-6 minute, add moist keeping measures (as covering or airtight) heating then and left standstill 1 hour.Alkaline matter (calcium oxide in the lime powder has been converted into calcium hydroxide) is fully carried out the activating reaction of flyash.The fly ash grain surface is softening, and broken particulate then generates gel with calcium hydroxide reaction.Because the major ingredient of flyash is silicon-dioxide and aluminium sesquioxide microballon, itself and the mixed reaction formula of alkaline matter are as follows:
Raw material after the above-mentioned ageing is gone into wheel roller rolled continuously 3-5 minute, make to be the flyash fragmentation of hollow shape vitreum microballoon originally, form irregular flyash minitype particle.Left standstill about 1 hour, i.e. secondary ageing makes the new surface of free calcium hydroxide (alkaline matter) and the particulate that exposes after rolling continue reaction and generates new gel again.At this moment, carry out secondary by wheel roller and grind refining about 2-3 minute, purpose is the particle homogenizing after making the further fragmentation of flyash and making fragmentation.
Through after the above-mentioned steps, the feedstock production process is finished substantially.With above-mentioned raw materials by the shaping mechanism blank molding.Owing to be half-dried material moulding, preferably select the hydraulic forming machine base for use, to guarantee the degree of compactness of adobe.
The piling drying, as adopting natural seasoning, it is different with season then to look the area, and the time is also different, can go into the kiln roasting but be dried to water ratio less than 6%.If in wet season or winter, can select the artificial environment dry brick.Because method of the present invention has adopted half-dried material molding mode, thereby time of drying is shorter, after tested, in northern area 4-5 month, the seasoning time is approximately 10 hours, can reach above-mentioned requirements.As adopt annular kiln waste heat drying, then only need can reach into the kiln standard less than 4 hours.
The adobe roasting because the adobe major ingredient is a flyash, wherein contains a certain amount of carbon, so do not need other refuel, adobe relies on spontaneous combustion to carry out sintering after the igniting.Because the flyash composition after the burning of different areas coal is slightly different, thereby the adobe sintering temperature is slightly variant with the difference of powdered coal ash, generally between 950-1050 ℃, when temperature reaches sintering temperature, constant temperature 1.5-2 hour, can lower the temperature kiln discharge when being cooled to normal temperature.
How much doping quantity of fly ash has direct relation with composite additive in the made from full fly ash building brick of the present invention.Lower as the effective component content in lime powder in the additive or the native alkali, such as being lower than 60%, then can strengthen the ratio of composite additive, but the highlyest can not surpass 10% of gross weight.If effective component content is higher in the additive, such as reaching more than 80%, then additives ratio can be reduced to 4%.The part specific embodiment of the ratio of flyash and composite additive sees Table 1 in the made from full fly ash building brick of the present invention.
Table 2
| Embodiment | The ratio of flyash and additive level | Additive composition and content (the proportion % in gross weight) | |||
| 1 | 95∶5 | Lime powder 3 | Wilkinite 1 | Water glass 0.3 | Iron protoxide 0.7 |
| 2 | 94∶6 | Soil alkali 2.4 | Refractory mortar 1.8 | Water glass 0.48 | Ferric oxide 0.72 |
| 3 | 90∶10 | Papermaking liquid 4.5 | Mierocrystalline cellulose 1 | Water glass 0.5 | Iron protoxide 4 |
| 4 | 96∶4 | Lime powder 1.2 | Wilkinite 1.6 | Water glass 0.4 | Ferric oxide 0.8 |
| 5 | 93∶7 | Soil alkali 3.2 | Refractory mortar 2.45 | Water glass 0.35 | 1 |
Embodiment 3 has used papermaking wastewater in last table, wherein contains more Mierocrystalline cellulose, thereby the corresponding minimizing of Mierocrystalline cellulose consumption.Answer the consumption of corresponding minimizing water when in addition, using papermaking wastewater.
The iron protoxide consumption increases in example 3, is that it belongs to the high-melting-point material because aluminium sesquioxide content is bigger in the flyash.In order to reduce maturing temperature, therefore, increased low-melting iron protoxide ratio.The effect of iron protoxide and ferric oxide, the one, in order to paint, make the color of brick become the common redness of people, be applicable to and make the exterior wall heavy-load bearing brick.The 2nd, be used to regulate maturing temperature, when high-melting-point substances content in the flyash is big, increase ferriferous oxide, it is temperature required to reduce roasting.
Additive and preparation thereof: additive composition of the present invention comprises lime powder or other inorganic alkaline thing such as yellow soda ash or sodium hydroxide; Wilkinite or other can improve the material of adobe wet tenacity, such as refractory mortar or Mierocrystalline cellulose or Sewage Plant, paper mill, drinking-water factory mud etc.; Water glass or other can improve the analogous material of adobe dry strength, as the mixture of flour and caustic soda; More than for guaranteeing the indispensable composition of flyash brick quality.
Aesthetic when satisfying as the exterior wall heavy-load bearing brick can also add an amount of ferrous oxide powder or ferric oxide powder, in order to color of regulating finished bricks and the maturing temperature of regulating flyash brick.
Calcium carbonate content usually should be greater than 60% in the above-mentioned lime powder, and in the inorganic alkaline thing in order to the replace lime powder, common lower-costly have native alkali (its main component is yellow soda ash Na
2CO
3) or papermaking wastewater (its main component is sodium hydroxide NaOH).When substituting, wherein the chemical equivalent of effective ingredient should equate.When using native alkali, because of wherein effective component content is lower, so large usage quantity makes total consumption of additive also increase.
The ratio of each major ingredient: lime powder 30-60%; Wilkinite 10-40%; Water glass 5-10%; Ferriferous oxide 10-40%.Pulverize after above each raw material is mixed in proportion, the screening plant screening gained powder above with 200 orders is that composite additive of the present invention constitutes.At first be mixed into slurry during use, mix with a certain proportion of flyash again and stir, just finished the preparation process of high blending flyash brick raw material with certain proportion water.Composite additive part proportioning embodiment of the present invention sees Table 3:
Table 3 100% (weight)
| Alkaline substance 30-60 | Increase wet tenacity material 10-40 | Water glass 5-10 | Ferriferous oxide 0-40 | |||||||
| Lime powder CaO | Soil alkali Na 2CO 3 | Papermaking liquid NaOH | Wilkinite | Refractory mortar | Mierocrystalline cellulose | Water glass | Surrogate | Iron protoxide | Ferric oxide | |
| Example 1 | 60 | 20 | 6 | 14 | ||||||
| Example 2 | 40 | 30 | 8 | 12 | ||||||
| Example 3 | 45 | 10 | 5 | 40 | ||||||
| Example 4 | 30 | 40 | 10 | 20 | ||||||
| Example 5 | 50 | 35 | 5 | 10 | ||||||
In the last table, increase in the material of adobe wet tenacity, except that refractory mortar, wilkinite, Mierocrystalline cellulose, can also use useless mud such as Sewage Plant, paper mill, drinking-water factory product (these are referred to as bentonitic congener) as an alternative.Its cost is lower.
And the material water glass substitutes that increases the adobe dry strength adds a small amount of caustic soda with the flour that lands of milling plant.Wherein useless flour accounts for 80% (weight), and caustic soda accounts for 20% (weight).At this moment, its proportion shared in composite additive should be in 8-10% (weight).The use of this surrogate makes cost lower.
Claims (8)
1, a kind of fly ash building brick, the flyash that contains 90-96wt%, surplus is an additive, described additive is the composite additive that contains water glass, it is characterized in that also having alkaline matter, wilkinite or refractory mortar or Mierocrystalline cellulose and ferriferous oxide in this composite additive composition, described alkaline matter comprises basic oxide or oxyhydroxide or carbonate normal salt, and wherein, alkaline matter content is 30-60wt%; Wilkinite or refractory mortar or content of cellulose are 10-40wt%; Water glass content is 5-10wt%; Described ferriferous oxide content is 10-40wt%.
2,, it is characterized in that described basic oxide are lime powder, wherein CaO 〉=60wt% according to the fly ash building brick of claim 1; Described oxyhydroxide is NaOH; Described carbonate normal salt is Na
2CO
3
3, according to the fly ash building brick of claim 2, it is characterized in that described oxyhydroxide is the NaOH in papermaking wastewater or other alkaline waste liquor, described carbonate normal salt is the Na in the native alkali
2CO
3
4, a kind of manufacturing as the method for described any fly ash building of claim 1-3 with brick comprises the steps:
A, get the raw materials ready, the flyash of getting 90-96wt% is in agitator;
B, join additive, get composite additive 4-10wt%, and add the water that is equivalent to the heavy 10-12% of flyash siccative, water temperature fully stirs hydrolysis more than 60 ℃;
C, stirring mix flyash and powerful the stirring with the hydrolysis composite additive, make it thorough mixing;
D, blank ageing, the blank after the stirring are heated and are left standstill one hour;
E, blank roll, and the blank after the ageing was rolled 3-10 minute continuously with wheel roller;
F, the ageing of blank secondary are heated the blank that rolls and are left standstill one hour;
G, blank secondary roll, and the blank that the secondary ageing is good rolled 2-5 minute with mixing pan again;
H, moulding, the blank moulding after secondary rolled;
I, drying make the adobe water ratio less than 6%;
J, the kiln roasting is gone in dried adobe, and kiln temperature keeps constant temperature 2 hours when rising to 1000 ± 50 ℃, then temperature is reduced to gradually kiln discharge behind the normal temperature.
5, a kind of specialist additive of producing fly ash building with brick contains water glass, it is characterized in that also having alkaline matter, bentonite or refractory mortar or Mierocrystalline cellulose and ferriferous oxide, and described water glass content is 5-10wt%; Described alkaline matter is a calcium oxide, and its content is 30-60wt%, or the yellow soda ash or the sodium hydroxide of equivalence; Described wilkinite or refractory mortar or content of cellulose are 10-40wt%; Described ferriferous oxide content is 10-40wt%.
6, according to the production fly ash building of claim 5 specialist additive with brick, it is characterized in that described calcium oxide takes from lime powder, CaO 〉=60wt% wherein, described yellow soda ash is taken from native alkali, and described sodium hydroxide is taken from papermaking wastewater or other alkaline waste liquor.
7, use the specialist additive of brick according to the production fly ash building of claim 5, the content that it is characterized in that described water glass is 6-8wt%; The content of described calcium oxide is that 35-55wt% or major ingredient are Na
2CO
3Equivalent native alkali or the equivalence papermaking wastewater, its effective ingredient is NaOH; Described bentonitic content is 15-30wt%; The content of described ferriferous oxide is 10-30wt%.
8, according to the specialist additive of the described fly ash building of each claim among the claim 5-7, it is characterized in that described ferriferous oxide is iron protoxide or ferric oxide with brick.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101097364A CN1280228C (en) | 2003-12-31 | 2003-12-31 | Full fly ash building brick and its manufacturing method and special additive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101097364A CN1280228C (en) | 2003-12-31 | 2003-12-31 | Full fly ash building brick and its manufacturing method and special additive |
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| CN1280228C true CN1280228C (en) | 2006-10-18 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100349821C (en) * | 2005-07-04 | 2007-11-21 | 赵宇昕 | Sintering brick additive and coal ash sintering brick highly doped with same |
| CN101328034B (en) * | 2008-07-15 | 2012-02-08 | 武汉理工大学 | Shrinkage reducing strengthening agent for sintered product with high content of flyash and preparation thereof |
| CN104671798A (en) * | 2013-11-29 | 2015-06-03 | 刘运武 | Brick and tile billet plasticizer |
| CN108640548A (en) * | 2018-07-06 | 2018-10-12 | 三明学院 | A kind of ground polymer material and preparation method thereof |
| CN108863311A (en) * | 2018-07-26 | 2018-11-23 | 合肥帧讯低温科技有限公司 | Building energy-saving insulating brick and preparation method thereof |
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