CN102206084B - Silicon heat-insulating product with high refractoriness under load and low volume weight, and preparation method thereof - Google Patents
Silicon heat-insulating product with high refractoriness under load and low volume weight, and preparation method thereof Download PDFInfo
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- CN102206084B CN102206084B CN201110066283.6A CN201110066283A CN102206084B CN 102206084 B CN102206084 B CN 102206084B CN 201110066283 A CN201110066283 A CN 201110066283A CN 102206084 B CN102206084 B CN 102206084B
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- silica sand
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Abstract
The invention relates to the technical field of heat-insulating materials, and especially relates to a silicon heat-insulating product with a high refractoriness under load and a low volume weight, and a preparation method of the heat-insulating product. The volume weight of the silicon heat-insulating product is 0.8 to 0.95g/cm<3>. The heat-insulating product is produced with the steps that: a main material of silica sand, and auxiliary materials of cured silica sand, silicon micro-powder, calcium hydrate, a mineralizer, and objects which can be burnt-out are mixed with water; and the obtained material is shaped and fired, such that the heat-insulating product is obtained. The invention provides a silicon heat-insulating product with a high refractoriness under load and a low volume weight. With the present invention, a usage requirement of heat-insulating materials used in high-temperature kilns is satisfied, and new contributions are brought to energy saving and emission reduction.
Description
Technical field
The invention belongs to lagging material technical field, particularly a kind of high RUL low unit weight siliceous heat insulation goods and preparation method.
Background technology
At present, the technical problem of siliceous heat insulation material is mainly that refractoriness under load is low and unit weight is higher.First its refractoriness under load, due to production technique and technology, is difficult to improve, just with conventional 1.0-1.2g/cm
3siliceous goods, major part be on material structure in order to ensure its unit weight, select super-low capacity heavy material and other material, these materials have a large amount of residues after sintering in goods, these residues mostly are K
2o and Na
2o, is cryogenic material, and on the refractoriness under load impact of goods greatly, therefore the refractoriness under load of goods cannot meet design and use requirement.Meanwhile, national correlation department is being formulated 1.0 g/cm
3when siliceous heat insulation standard of articles, also cannot in technical indicator, break through, can only formulate and implement according to market situation and Current situation of the manufacturing process.Up-to-date national standard is YB/T386---1.0 g/cm that 1994 standards are promulgated
3the refractoriness under load of siliceous heat insulation goods is 1400 DEG C.For siliceous heat insulation goods obtain wide application on novel energy-conserving high temperature kiln, to meet demand and the design user demand of modern industry Development of The Kiln, the refractoriness under load technical indicator of these goods must be put on.
Another technical problem of siliceous heat insulation material is that unit weight is higher.Due to Technology, the unit weight of these goods at present can only be at>=1.0 g/cm
3state.The production technique of the current domestic same industry and technology are difficult to the unit weight of its goods to drop to < 1.0 g/cm
3state.The performance of insulating product is that compared with low thermal conductivity, to ensure good heat-proof quality, under general status, the volume density of insulating product is directly proportional to thermal conductivity, therefore will ensure that good heat-proof quality just must lower goods unit weight.Our country last century the eighties once attempted design and promoted the use of the siliceous insulating product of the low heat conduction of low unit weight, be less than 1.0 g/cm
3the technical indicator of volume density, and also work out corresponding 0.8-0.9 g/cm in the resistance to material standard of country the inside
3technical indicator, but due to production technology problem, these goods do not emerge, and while again revising national resistance to material standard, because market is provided with the adequate and systematic service of these goods, just inside standard, have left out low unit weight siliceous heat insulation brick to the nineties.Still not these goods and technical indicator (0.8-0.85-0.9-0.95) while again revising resistance to material standard to 2007.Due to the progressively scarcity of mankind's energy, the dynamics that national energy-saving reduces discharging is constantly strengthened, require all the more strict to the heat-insulating and energy-saving of modern industry stove, therefore the necessary unit weight siliceous heat insulation goods lowers, to ensure lower thermal conductivity and better heat-insulating and energy-saving effect, the demand reducing discharging to adapt to modern industry saving energy in kiln.
Summary of the invention
The object of the present invention is to provide the low unit weight siliceous heat insulation of a kind of high RUL goods, solve soft low, the problem that unit weight is high of existing siliceous heat insulation goods lotus.
The technical solution used in the present invention is as follows:
The low unit weight siliceous heat insulation of high RUL goods, described siliceous heat insulation goods unit weight is 0.8-0.95 g/cm
3, taking silica sand as major ingredient, taking ripe silica sand, silicon powder, calcium hydroxide, mineralizer, can burnout substances as auxiliary material, fire acquisition with water mixing moulding; Wherein said ripe silica sand is obtained at 1200-1400 DEG C of sintering by silica sand.
Concrete, the parts by weight of each raw material are as follows:
Silica sand 75-80 part, ripe silica sand 5-8 part, silicon powder 7-15 part, calcium hydroxide 2.5-4 part, mineralizer 0.3-0.8 part, can burnout substances 14-25 part, water 8-12 part.
Described can burnout substances be the mixture of sawdust and carbon granules or carbon dust, wherein, and sawdust 6-9 part, carbon granules or carbon dust 8-16 part.
Described mineralizer is iron phosphorus powder.
SiO in silica sand
2>=98wt%, Al
2o
3≤ 0.5wt%, crosses 180 mesh sieves; SiO in ripe silica sand
2>=98wt %; SiO in silicon powder
2>=96 wt %, cross 250 mesh sieves; Ca0 > 90wt% in calcium hydroxide; Fe in iron phosphorus powder
2o
3> 80wt%; C > 70 wt % in carbon granules or carbon dust, granularity is not more than 3mm; Sawdust is crossed 30 mesh sieves, and unit weight is 0.4-0.7 g/cm
3.
The present invention also provides the preparation method of the low unit weight siliceous heat insulation of a kind of high RUL goods, first by silica sand and calcium hydroxide, can burnout substances, silicon powder, ripe silica sand, mineralizer puddle in proportion to uniform state, then add water again to puddle to uniform state, ageing mixture aftershaping, be dried, fire, cooling and get final product.
When dry, be preferable at 100 DEG C and carry out, be dried to moisture content and be not more than 1%.
Firing temperature is 1400-1450 DEG C.
Sintering procedure is: normal temperature to 400 DEG C sintering 10h; 400 DEG C of-800 DEG C of sintering 10h; 800-1000 DEG C of sintering 16h; 1000 DEG C of-1350 DEG C of sintering 20h; 1350 DEG C of-1450 DEG C of sintering 20h; Sintering 10h 1450 DEG C-1000 DEG C time; 1000 DEG C-normal temperature 10h.
The ageing mixture time is no less than 0.5h, and concrete those skilled in the art can regulate as the case may be.
The present invention adopt carbon granules or carbon dust part substitute tradition conventional can burnout substances as polystyrene, perlite etc., greatly reduced in goods can burnout substances residue (potassium, sodium) etc. affect the objectionable impurities that lotus is soft; Select again HIGH-PURITY SILICON raw material silica sand (SiO
2>=98%) be major ingredient, and improve sintering temperature to ensure that the refractoriness under load of goods reaches 1450 DEG C-1500 DEG C.Selecting carbon granules or carbon dust and sawdust is can burnout substances time, and the space that reduces goods unit weight forms, and the unit weight of goods can be dropped to the state of 0.8-0.95.
Siliceous heat insulation goods of the present invention can (more than 1350 DEG C) use on high temperature kiln.
The present invention, with respect to prior art, has following advantage:
The invention provides the siliceous heat insulation goods of the low unit weight of a kind of high RUL, met the service requirements of lagging material in high temperature kiln, for new contribution has been made in energy-saving and emission-reduction.
Embodiment
With specific embodiment, technical scheme of the present invention is described below, but protection scope of the present invention is not limited to this:
Embodiment 1
First by 80 parts of (weight parts of silica sand, lower with), 7 parts of silicon powders, (silica sand obtains in 1350 DEG C of sintering ripe silica sand, lower with) 8 parts, 2.5 parts, calcium hydroxide, 0.3 part of mineralizer iron phosphorus powder, 6 parts, sawdust, 9 parts of carbon granules are puddled to uniform state, then add 10 parts of water secondaries and puddle to uniform state; With press compacting (or cast) moulding; When work piece are dried to moisture and are less than 1%, advance kiln sintering 96 hours according to the heating curve of these goods: normal temperature to 400 DEG C sintering 10 hours; Sintering 10 hours 400 DEG C-800 DEG C time; Sintering 16 hours when 800-1000; Sintering 20 hours 1000 DEG C-1350 DEG C time; Sintering 20 hours 1350 DEG C-1450 DEG C time; Sintering 10 hours 1450 DEG C-1000 DEG C time; 1000 DEG C-normal temperature sintering 10 hours, then cooling Selected Inspection.The unit weight of the siliceous heat insulation goods that obtain is 0.95 g/cm
3, refractoriness under load is 1500 DEG C.
Embodiment 2
First 14 parts of 78 parts of silica sands, 10 parts of silicon powders, 7 parts of ripe silica sands, 4 parts, calcium hydroxide, 0.45 part of iron phosphorus powder, 8 parts, sawdust, carbon granules are puddled to uniform state, added 9 parts of water secondaries and puddle to uniform state; With press compacting (or cast) moulding; When work piece are dried to moisture and are less than 1%, advance kiln to carry out sintering 96 hours, then cooling Selected Inspection according to the heating curve in embodiment 1.The unit weight of the siliceous heat insulation goods that obtain is 0.85 g/cm
3, refractoriness under load is 1460 DEG C.
Embodiment 3
First 16 parts of 75 parts of silica sands, 15 parts of silicon powders, 5 parts of ripe silica sands, 4 parts, calcium hydroxide, 0.8 part of iron phosphorus powder, 9 parts, sawdust, carbon granules are puddled to uniform state, added 8 parts of water secondaries and puddle to uniform state; With press compacting (or cast) moulding; When work piece are dried to moisture and are less than 1%, advance kiln to carry out sintering 96 hours, then cooling Selected Inspection according to the heating curve in embodiment 1.The unit weight of the siliceous heat insulation goods that obtain is 0.8 g/cm
3, refractoriness under load is 1450 DEG C.
The unit weight that adopts the inventive method to obtain is respectively 0.8 g/cm
3, 0.85 g/cm
3, 0.9 g/cm
3, 0.95 g/cm
3other performance perameters of siliceous heat insulation goods refer to following table:
Claims (4)
1. the preparation method of the low unit weight siliceous heat insulation of high RUL goods, is characterized in that, described siliceous heat insulation goods unit weight is 0.8-0.95 g/cm
3, taking silica sand as major ingredient, taking ripe silica sand, silicon powder, calcium hydroxide, mineralizer, can burnout substances as auxiliary material, fire acquisition with water mixing moulding; Wherein said ripe silica sand is obtained at 1200-1400 DEG C of sintering by silica sand;
The parts by weight of each raw material are as follows:
Silica sand 75-80 part, ripe silica sand 5-8 part, silicon powder 7-15 part, calcium hydroxide 2.5-4 part, mineralizer 0.3-0.8 part, can burnout substances 14-25 part, water 8-12 part;
Described can burnout substances be the mixture of sawdust and carbon granules or carbon dust, wherein, and sawdust 6-9 part, carbon granules or carbon dust 8-16 part; Described mineralizer is iron phosphorus powder;
SiO in silica sand
2>=98wt%, Al
2o
3≤ 0.5wt%, crosses 180 mesh sieves; SiO in ripe silica sand
2>=98wt %; SiO in silicon powder
2>=96 wt %, cross 250 mesh sieves; Fe in iron phosphorus powder
2o
3> 80wt%; C > 70 wt % in carbon granules or carbon dust, granularity is not more than 3mm; Sawdust is crossed 30 mesh sieves, and unit weight is 0.4-0.7 g/cm
3;
First by silica sand and calcium hydroxide, can burnout substances, silicon powder, ripe silica sand, mineralizer puddle in proportion to uniform state, then adds water again to puddle to uniform state, press compression moulding after ageing mixture, be dried, fire, cooling and get final product; Firing temperature is 1400-1450 DEG C.
2. the preparation method of the low unit weight siliceous heat insulation of high RUL as claimed in claim 1 goods, is characterized in that, sintering procedure is: normal temperature to 400 DEG C sintering 10h; 400 DEG C of-800 DEG C of sintering 10h; 800-1000 DEG C of sintering 16h; 1000 DEG C of-1350 DEG C of sintering 20h; 1350 DEG C of-1450 DEG C of sintering 20h; Sintering 10h 1450 DEG C-1000 DEG C time; 1000 DEG C-normal temperature 10h.
3. the preparation method of the low unit weight siliceous heat insulation of the high RUL goods as described in one of claim 1-2, is characterized in that, the ageing mixture time is no less than 0.5h.
4. the preparation method of the low unit weight siliceous heat insulation of high RUL as claimed in claim 3 goods, is characterized in that, when dry, at 100 DEG C, carries out, and is dried to moisture content and is not more than 1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110066283.6A CN102206084B (en) | 2011-03-18 | 2011-03-18 | Silicon heat-insulating product with high refractoriness under load and low volume weight, and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110066283.6A CN102206084B (en) | 2011-03-18 | 2011-03-18 | Silicon heat-insulating product with high refractoriness under load and low volume weight, and preparation method thereof |
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| CN102206084A CN102206084A (en) | 2011-10-05 |
| CN102206084B true CN102206084B (en) | 2014-06-04 |
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Families Citing this family (4)
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| CN106064948A (en) * | 2016-07-26 | 2016-11-02 | 郑州顺通新型耐火材料有限公司 | A kind of manufacture method of the leakage proof brick used on aluminium manufacturer electrolysis bath |
| CN108752022B (en) * | 2018-06-14 | 2021-09-17 | 郑州远东耐火材料有限公司 | Method for manufacturing heat insulation material for producing fused zirconia alumina bricks |
| JP7251823B2 (en) * | 2021-03-01 | 2023-04-04 | 明智セラミックス株式会社 | Thermal insulation for refractories |
| CN113087504A (en) * | 2021-04-16 | 2021-07-09 | 郑州东豫新材料科技有限公司 | High-thermal-conductivity compact silica brick and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101362635B (en) * | 2007-08-07 | 2011-04-20 | 徐进清 | Silica heat insulating products and preparation method thereof |
| CN101219903B (en) * | 2007-12-05 | 2010-09-01 | 瑞泰科技股份有限公司 | Advanced silica refractory and manufacturing technique thereof |
| CN101550018B (en) * | 2009-05-05 | 2011-12-14 | 武汉科技大学 | Silica fire resistant castable and preparing method thereof |
| CN101781919A (en) * | 2010-01-29 | 2010-07-21 | 施富贤 | Low heat conduction light heat insulating silica brick |
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