CN1029704C - High strength light weight rice hull ash insulation brick and its producing method - Google Patents
High strength light weight rice hull ash insulation brick and its producing method Download PDFInfo
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- CN1029704C CN1029704C CN 89108273 CN89108273A CN1029704C CN 1029704 C CN1029704 C CN 1029704C CN 89108273 CN89108273 CN 89108273 CN 89108273 A CN89108273 A CN 89108273A CN 1029704 C CN1029704 C CN 1029704C
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- China
- Prior art keywords
- rice hull
- hull ash
- brick
- heat preservation
- light weight
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Abstract
The present invention relates to a high-strength light-weight heat preservation brick which is composed of 10 to 70 % of rice hull dust, 20 to 40 % of adhesive and 10 to 50 % of reinforcing agent. Rice hulls are used as fuel to be burnt, and the rice hull dust is used as raw material for making a heat preservation brick. Because a hollow microsphere reinforcing agent is added into the ingredients of the heat preservation brick, and an optimized burning process is adopted, the heat preservation brick has the favorable advantages of heat preservation and heat insulation performance of a diatomite heat preservation brick and the advantages of high strength and high fire resistance of a light weight clay brick; the present invention provides an energy saving material with a low price and fine quality for industrial furnaces.
Description
The invention belongs to heat insulating brick, particularly is the insulating brick of main material production with the rice hull ash.
At present, insulating brick commonly used mainly contains diatomite insulating block and clay insulating refractory block in the Industrial Stoves.The diatomite brick thermal and insulating performance is good, but intensity is low, and visual appearance is poor, and breakage rate is big when transportation and use, and its refractoriness is also lower, can only use below 900 ℃.The clay insulating refractory block refractoriness is greater than 1580 ℃, and intensity is higher, and use temperature is more than 1150 ℃, but its thermal and insulating performance is poor.But its performance only can reach or be lower than the quality standard of diatomite insulating block " Chinese pottery " fourth phase in 1987 the 4th～9 page of (document) (1st)) and reported the manufacture method of relevant rice hull ash light-weight insulating brick on the 12nd～17 page of " Jiangsu pottery " 1988 the 1st phase.
The objective of the invention is to overcome the low problem of product strength that prior art produces provides a kind of thermal and insulating performance to be better than diatomite insulating block, and strength property reaches or is higher than clay insulating refractory block, and use temperature is 1200 ℃ a high-strength light insulating brick.
Key problem in technology of the present invention is the rice hull ash insulation brick short texture at prior art production, the weakness that intensity is low, and the cenosphere that adds high-strength light in raw material is formed is a toughener, has improved the intensity of goods significantly, and has made SiO in the goods
2And Al
2O
3Ratio more reasonable, formed and had high-intensity mullite mineral, and improved the refractoriness of goods significantly.
The raw material weight percentage composition of rice hull ash insulation brick of the present invention is:
Rice hull ash 10～70%
Tackiness agent 20～40%
Toughener 10～50%
During production by adding 0～10% lime and 20～40% water after the above-mentioned prescription batching.
Rice hull ash of the present invention be meant rice husk act as a fuel through the burning after product, it has microstructure form as shown in Figure 1.
Tackiness agent of the present invention is meant kaolin fireclay with good plasticity and refractoriness etc.
Toughener of the present invention is meant cenosphere, and for example it is the cenosphere that screening is come out from the flyash in power station.
The production method of insulating brick of the present invention is as follows: above-mentioned various raw materials stir material after the weighing by the prescription batching in stirrer, be pressed into adobe with the pressing machine semidrying, enter roasting in the kiln after drying.The continuous drying of process using of the present invention and roasting kiln are fuel with the rice husk, and the rice hull ash that obtains after the burning is used as the raw material of brickmaking again, make this waste material of rice husk obtain comprehensive utilization.
Most critical is firing process in the manufacture craft of the present invention.The degree that the crystal formation of determining to depend on silicon-dioxide in the rice hull ash changes and mullite reacts of sintering temperature, different firing temperatures is very big to the performance impact of goods.From Fig. 2, Fig. 3 as seen, firing temperature is low greatly, mullite formation amount seldom or do not have, crystal transforms not exclusively, so that article construction is loose, has a strong impact on use properties.But firing temperature is too high, owing to produce a large amount of fused solutions, volumetric shrinkage is very big, causes the goods cracking.So firing temperature is controlled at 1140 °～1220 ℃ and is advisable.Reach the soaking time behind the firing temperature, very big to the intensity effect of insulating brick.Constant temperature time should be controlled at 4 to 16 hours, was preferably in 8 to 12 hours.
It is as follows that product of the present invention is carried out chemico-analytic result:
SiO
2Al
2O
3Fe
2O
3CaO MgO Na
2O
74.85 16.73 1.46 2.71 0.41 0.53
K
2O MnO TiO
2P
2O
5SO
3
2.35 0.14 0.23 0.32 0.01
The technical feature of goods of the present invention is as follows:
True porosity 70～80%
Volume density 0.5～0.8 gram per centimeter
3
Normal temperature ultimate compression strength 0.8～4.0MPa
Heavily burn line and change (1000 ℃ * 12 hours) 0%
(1200 ℃ * 12 hours)＜2%
Refractoriness 〉=1580 ℃
Thermal conductivity (300 ° ± 10 ℃) 0.12～0.18(W/mk)
The drawing explanation:
Fig. 1 is scanning electron microscope aspect graph * 500 of rice hull ash,
Fig. 2 is the influence figure of firing temperature to ultimate compression strength,
Fig. 3 is the influence figure of firing temperature to shrinking percentage,
Fig. 4 is the influence figure of soaking time to ultimate compression strength.
Further specify the present invention below in conjunction with embodiment.
40 parts of rice hull ash, 30 parts of clays, 30 parts of cenospheres.Add 3 parts in lime, 30 parts in water, through stirring, die mould, drying process enter roasting in the kiln.Be incubated 12 hours down at 1140～1220 ℃, obtain end properties and list in table 1.
10 parts of rice hull ash, 40 parts of clays, 50 parts of cenospheres add 20 parts in water, and the brick that makes through the operation with embodiment 1 enters roasting in the kiln.1140 °～1220 ℃ following constant temperature 4 hours, the end properties that obtains was listed in table 1.
Embodiment 3
70 parts of rice hull ash, 20 parts of clays, 10 parts of cenospheres add 5 parts in lime, and the adobe through making with embodiment 1 operation enters roasting in the kiln.1140 °～1220 ℃ following constant temperature 16 hours, the end properties that obtains was listed in table 1.
In sum, can see that from the performance comparison of table 1 the present invention obtains significant technique effect:
1, technical features such as the intensity of goods, use temperature are better than the rice hull ash insulation brick of diatomite insulating block and prior art.
2, the heat-proof quality of goods is better than clay insulating refractory block, reaches or near the thermal conductivity performance number of prior art rice hull ash insulation brick.
3, drying of the present invention and roasting process are fuel with the rice husk, and the rice hull ash after the burning makes rice husk obtain comprehensive utilization as the raw material of brickmaking.
Technology of the present invention in a word is reasonable, and product properties is good, and a kind of goods of super quality and competitive price are provided for Industrial Stoves.These goods are used on industrial furnace and have been received excellent energy-saving effect.
Table 1 insulating brick performance comparison table
The withstand voltage thermal conductivity refractoriness of high workload normal temperature of performance volume density
Product (gram per centimeter
3) temperature (℃) 300 ± 10 ℃ of intensity MPa (℃)
（W/m·k）
Embodiment 3 0.59 1,200 0.79 0.12 1580
Documents (1) 0.61 1,000 0.67 0.12 1360
Diatomite insulating block 0.60 900 0.8 0.17
GB3996-83
Heat insulation anti-0.60 1,200 1.5 (350 ± 250 ℃) of clay matter
Firebrick GB3994-83 0.25
Claims (5)
1, the high strength light weight rice hull ash insulation brick a kind of by rice hull ash, that components such as tackiness agent constitute, the invention is characterized in: add toughener on light weight rice hull ash insulation brick component basis, its composition of raw materials is (weight %):
Rice hull ash 10～70%
Tackiness agent 20～40%
Toughener 10～50%
2, insulating brick according to claim 1 is characterized in that described toughener is meant cenosphere.
3, insulating brick according to claim 1 is characterized in that described tackiness agent is meant the clay with good plasticity and refractoriness.
4, a kind of making method of high-strength light insulating brick, it comprises batching, metering, stir, compression moulding, drying such as fires at operation, the invention is characterized in, the continuous drying and the roasting kiln that adopt are fuel with the rice husk, and the rice hull ash that obtains after the burning is used as the raw material of brickmaking again, the firing temperature of kiln is controlled at 1140 °～1220 ℃, and the soaking time that reaches behind the firing temperature is 4～16 hours.
5, insulating brick making method according to claim 2, the soaking time that it is characterized in that reaching behind the firing temperature is 8～12 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89108273 CN1029704C (en) | 1989-10-28 | 1989-10-28 | High strength light weight rice hull ash insulation brick and its producing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89108273 CN1029704C (en) | 1989-10-28 | 1989-10-28 | High strength light weight rice hull ash insulation brick and its producing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1041648A CN1041648A (en) | 1990-04-25 |
| CN1029704C true CN1029704C (en) | 1995-09-06 |
Family
ID=4857507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89108273 Expired - Fee Related CN1029704C (en) | 1989-10-28 | 1989-10-28 | High strength light weight rice hull ash insulation brick and its producing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1029704C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1903982A (en) * | 2006-07-31 | 2007-01-31 | 庞佃丰 | Machine made charcoal equipment and method of making charcoal |
| CN101948328B (en) * | 2010-08-11 | 2012-07-04 | 四川大学 | Crystalline ceramic fire-protection sound-absorbing product and preparation method thereof |
| CN103159428A (en) * | 2013-03-27 | 2013-06-19 | 武汉科技大学 | Rice hull ash based porous material and preparation method thereof |
| CN105418095B (en) * | 2015-12-01 | 2017-09-19 | 浙江湖州父子岭耐火集团有限公司 | A kind of lightweight refractory for glass smelting kiln of low heat conduction |
| CN106316448B (en) * | 2016-07-28 | 2019-02-05 | 河南工业大学 | A kind of light porous refractory material of rice husk base and preparation method thereof |
| CN106800418A (en) * | 2016-12-23 | 2017-06-06 | 安徽元通采暖科技有限公司 | Light fire brick and its preparation technology containing rice husk |
| CN108975867A (en) * | 2018-08-10 | 2018-12-11 | 河南弘盛再生资源利用有限公司 | The formula and preparation method of diatomite composite material based on oil-containing waste diatomite |
| CN110028334A (en) * | 2019-03-20 | 2019-07-19 | 广西大学 | A kind of ecology damping brick and preparation method thereof |
| CN113149702A (en) * | 2021-03-31 | 2021-07-23 | 江苏长城窑炉工程有限公司 | High-strength light insulating brick |
-
1989
- 1989-10-28 CN CN 89108273 patent/CN1029704C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1041648A (en) | 1990-04-25 |
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