CN103880028A - Method for synthesizing xonotlite powder by utilizing rice hull ash or straw ash crop wastes - Google Patents
Method for synthesizing xonotlite powder by utilizing rice hull ash or straw ash crop wastes Download PDFInfo
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- CN103880028A CN103880028A CN201210558562.9A CN201210558562A CN103880028A CN 103880028 A CN103880028 A CN 103880028A CN 201210558562 A CN201210558562 A CN 201210558562A CN 103880028 A CN103880028 A CN 103880028A
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Abstract
A method for synthesizing xonotlite powder by utilizing rice hull ash or straw ash crop wastes mainly solves the problems of high production cost, complicated preparation process and resource waste of present technologies. The method is characterized in that the rice hull ash or straw ash crop wastes used as a silicon source, calcium hydroxide and water are put in an autoclave in proportion, and undergo a hydrothermal synthesis reaction. The reaction temperature and the reaction pressure of the reaction process are controlled to prepare the xonotlite powder which is the main component of calcium silicate boards. The method has the advantages of simple process, low cost the above prepared product, and realization of environmental protection by reasonably processing the the crop wastes.
Description
Technical field
The present invention relates to a kind of method of synthetic xonotlite powder, is exactly a kind of method of utilizing rice hull ash or the synthetic xonotlite powder of straw ash wastes of crops, belongs to wastes of crops utilization, heat insulating and building and ornament materials manufacturing technology field.
Background technology
Xonotlite powder is calcium silicate board main component, and synthetic xonotlite powder makes calcium silicate board after adding fortifying fibre after copying filter, mold pressing and boiling maintenance.Xonotlite powder in the past more adopts the levigate raw material such as quartz sand or diatomite that silicon source is provided, and carries out hydrothermal synthesis reaction prepare with calcium hydroxide.Exist that production cost is high, the shortcoming of complicated process of preparation and waste resource.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, a kind of novel method of preparing xonotlite powder is provided, reduce production costs to reach, rationally utilize the object of wastes of crops.
For achieving the above object, the present invention adopts following technical proposals: the method for utilizing the synthetic xonotlite powder of rice hull ash or straw ash wastes of crops, it is that react in silicon source that the method adopts rich silica containing wastes of crops rice hull ash or straw ash, by wastes of crops-straw ash or rice hull ash, calcium hydroxide powder and water, put in proportion autoclave and carry out hydrothermal synthesis reaction, reaction process need be controlled temperature of reaction and pressure, makes xonotlite powder after having reacted.
Above-mentioned wastes of crops can be one or both in straw ash or rice hull ash, and wherein the content of carbon answers≤40%, and silicone content answers >=50%; Above-mentioned calcium hydroxide powder purity >=95%, granularity is answered≤15 μ m; When above-mentioned straw ash or rice hull ash, calcium hydroxide and water carry out Hydrothermal Synthesis, the content of calcium in dioxide-containing silica and calcium hydroxide in straw ash or rice hull ash, mol ratio is 0.9-1.1, the quality of water is 15-30:1 with the ratio of the total mass of solid material.The total mass of above-mentioned solid material refers in straw ash or rice hull ash the quality sum of calcium oxide content in dioxide-containing silica and calcium hydroxide.When hydrothermal synthesis reaction, temperature of reaction should be controlled between 180 DEG C-240 DEG C.Hydrothermal synthesis reaction the reaction time should be controlled between 5-12 hour.
Beneficial effect of the present invention: at present domestic approximately more than one hundred million tons of straw ashs or rice hull ash are wasted every year, this invention can effectively utilize these waste resources, simplifies production technique, reduces product cost, more be conducive to socioeconomic sustainable, coordinated development, improve the ecological environment.To improving resource utilization and building a resource-conserving and environment-friendly society and play significance.
Embodiment
Embodiment 1
Be 40% by carbon content, the straw ash that silicone content is 55% and purity are 96%, and granularity is that the calcium hydroxide below 15 μ m is mixed into solid material, and wherein in straw ash, in silicone content and calcium hydroxide, calcium contents mol ratio is 0.9.Add wherein water, the ratio of the quality of water and the quality of solid material (the calcium oxide content quality summation of the dioxide-containing silica of straw ash and calcium hydroxide) is 15:1 again.Mixed raw material is poured in reactor and carried out hydrothermal synthesis reaction, and temperature of reaction is controlled at 180 DEG C, and the reaction times is 12h, obtains xonotlite powder.
Embodiment 2
Be 35% by carbon content, the straw ash that silicone content is 60% and purity are 98%, and granularity is that the calcium hydroxide below 8 μ m is mixed into solid material, and wherein in straw ash, in silicone content and calcium hydroxide, calcium contents mol ratio is 1.Add wherein water, the ratio of the quality of water and the quality of solid material (the calcium oxide content quality summation of the dioxide-containing silica of straw ash and calcium hydroxide) is 25:1 again.Mixed raw material is poured in reactor and carried out hydrothermal synthesis reaction, and temperature of reaction is controlled at 200 DEG C, and the reaction times is 10h, obtains xonotlite powder.
Embodiment 3
Be 25% by carbon content, the rice hull ash that silicone content is 72% and purity are 97%, and granularity is that the calcium hydroxide below 10 μ m is mixed into solid material, and wherein in rice hull ash, in silicone content and calcium hydroxide, calcium contents mol ratio is 1.05.Add wherein water, the ratio of the quality of water and the quality of solid material (the calcium oxide content quality summation of the dioxide-containing silica of rice hull ash and calcium hydroxide) is 30:1 again.Mixed raw material is poured in reactor and carried out hydrothermal synthesis reaction, and temperature of reaction is controlled at 220 DEG C, and the reaction times is 9h, obtains xonotlite powder.
Embodiment 4
Be 25% by total carbon content, total silicon content is that 72% straw ash and rice hull ash mixture and purity are 99%, granularity is that the calcium hydroxide below 15 μ m is mixed into solid material, and wherein in the mixture of straw ash and rice hull ash, in silicone content and calcium hydroxide, calcium contents mol ratio is 1.05.Add wherein water, the ratio of the quality of water and the quality of solid material (the calcium oxide content quality summation of dioxide-containing silica and calcium hydroxide in straw ash and rice hull ash mixture) is 30:1 again.Mixed raw material is poured in reactor and carried out hydrothermal synthesis reaction, and temperature of reaction is controlled at 220 DEG C, and the reaction times is 9h, obtains xonotlite powder.
Claims (5)
1. one kind is utilized the method for rice hull ash or the synthetic xonotlite powder of straw ash wastes of crops, the method is by wastes of crops-straw ash or rice hull ash, calcium hydroxide powder and water, put in proportion autoclave and carry out hydrothermal synthesis reaction, reaction process need be controlled temperature of reaction and pressure, makes xonotlite powder after having reacted.
2. the method for utilizing rice hull ash or the synthetic xonotlite powder of straw ash wastes of crops as claimed in claim 1, above-mentioned wastes of crops can be one or both in straw ash or rice hull ash, wherein carbon content≤40%, silicone content >=50%.
3. the method for utilizing rice hull ash or the synthetic xonotlite powder of straw ash wastes of crops as claimed in claim 1, above-mentioned calcium hydroxide powder purity >=95%, granularity should≤15 μ m.
4. the method for utilizing rice hull ash or the synthetic xonotlite powder of straw ash wastes of crops as claimed in claim 1, when described straw ash or rice hull ash, calcium hydroxide and water carry out Hydrothermal Synthesis, the content of calcium in dioxide-containing silica and calcium hydroxide in straw ash or rice hull ash, mol ratio is 0.9-1.1; When straw ash or rice hull ash, calcium hydroxide and water carry out Hydrothermal Synthesis, the quality of water is 15-30:1 with the ratio of the total mass of solid material, and the total mass of solid material refers in straw ash or rice hull ash the quality sum of calcium oxide content in dioxide-containing silica and calcium hydroxide.
5. the method for utilizing rice hull ash or the synthetic xonotlite powder of straw ash wastes of crops as claimed in claim 1, when described hydrothermal synthesis reaction, temperature of reaction is controlled between 180 DEG C-240 DEG C; Hydrothermal synthesis reaction the reaction time was controlled between 5-12 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210558562.9A CN103880028A (en) | 2012-12-19 | 2012-12-19 | Method for synthesizing xonotlite powder by utilizing rice hull ash or straw ash crop wastes |
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| CN201210558562.9A CN103880028A (en) | 2012-12-19 | 2012-12-19 | Method for synthesizing xonotlite powder by utilizing rice hull ash or straw ash crop wastes |
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| CN103880028A true CN103880028A (en) | 2014-06-25 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104402010A (en) * | 2014-11-06 | 2015-03-11 | 西南科技大学 | Preparation method of xonotlite-type calcium silicate material |
| CN104445232A (en) * | 2014-12-10 | 2015-03-25 | 山东理工大学 | Method for preparing xonotlite powder from fused quartz as raw material |
| CN104591630A (en) * | 2015-01-12 | 2015-05-06 | 山东理工大学 | Preparation method for xonotlite type adapter plate material for casting aluminum |
| CN104451883B (en) * | 2014-11-06 | 2017-03-01 | 西南科技大学 | A kind of preparation method of eakleite whisker |
| CN106927471A (en) * | 2015-12-31 | 2017-07-07 | 新材料与产业技术北京研究院 | A kind of preparation method of nanometer silica line |
| CN111170324A (en) * | 2020-01-21 | 2020-05-19 | 张战军 | Method for preparing light high-whiteness calcium silicate micro powder by using rice hull ash |
| CN111574092A (en) * | 2020-05-21 | 2020-08-25 | 金陵科技学院 | Method for preparing high-performance impact-resistant milled coal ash concrete material by using agricultural solid wastes |
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| JPS59141452A (en) * | 1983-02-01 | 1984-08-14 | 工業技術院長 | Manufacture of calcium silicate molded body |
| JPS59146967A (en) * | 1983-02-07 | 1984-08-23 | 株式会社 大阪パツキング製造所 | Lightweight calcium silicate formed body and manufacture |
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| GB2106087B (en) * | 1981-07-23 | 1985-04-24 | Agency Ind Science Techn | Method for the preparation of calcium silicate hydrates by hydrothermal reaction and refactory materials for thermal insulation thereof |
| JPS59141452A (en) * | 1983-02-01 | 1984-08-14 | 工業技術院長 | Manufacture of calcium silicate molded body |
| JPS59146967A (en) * | 1983-02-07 | 1984-08-23 | 株式会社 大阪パツキング製造所 | Lightweight calcium silicate formed body and manufacture |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104402010A (en) * | 2014-11-06 | 2015-03-11 | 西南科技大学 | Preparation method of xonotlite-type calcium silicate material |
| CN104451883B (en) * | 2014-11-06 | 2017-03-01 | 西南科技大学 | A kind of preparation method of eakleite whisker |
| CN104445232A (en) * | 2014-12-10 | 2015-03-25 | 山东理工大学 | Method for preparing xonotlite powder from fused quartz as raw material |
| CN104591630A (en) * | 2015-01-12 | 2015-05-06 | 山东理工大学 | Preparation method for xonotlite type adapter plate material for casting aluminum |
| CN106927471A (en) * | 2015-12-31 | 2017-07-07 | 新材料与产业技术北京研究院 | A kind of preparation method of nanometer silica line |
| CN111170324A (en) * | 2020-01-21 | 2020-05-19 | 张战军 | Method for preparing light high-whiteness calcium silicate micro powder by using rice hull ash |
| CN111574092A (en) * | 2020-05-21 | 2020-08-25 | 金陵科技学院 | Method for preparing high-performance impact-resistant milled coal ash concrete material by using agricultural solid wastes |
| CN111574092B (en) * | 2020-05-21 | 2022-02-11 | 金陵科技学院 | Method for preparing high-performance impact-resistant milled coal ash concrete material by using agricultural solid wastes |
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Application publication date: 20140625 |