CN103058678A - High-density ultrahigh-purity magnesia-calcium brick and preparation method thereof - Google Patents
High-density ultrahigh-purity magnesia-calcium brick and preparation method thereof Download PDFInfo
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- CN103058678A CN103058678A CN2012105834513A CN201210583451A CN103058678A CN 103058678 A CN103058678 A CN 103058678A CN 2012105834513 A CN2012105834513 A CN 2012105834513A CN 201210583451 A CN201210583451 A CN 201210583451A CN 103058678 A CN103058678 A CN 103058678A
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Abstract
The invention discloses a high-density ultrahigh-purity magnesia-calcium brick and a preparation method thereof. The high-density ultrahigh-purity magnesia-calcium brick is prepared from 9 to 16% of magnesia-calcium sand having particle sizes of 5-7mm, 9 to 16% of magnesia-calcium sand having particle sizes of 3-5mm, 9 to 16% of magnesia-calcium sand having particle sizes of 1-3mm, 13 to 32% of magnesia-calcium sand having particle sizes of 0.5-1mm, 5 to 25% of magnesia-calcium sand having particle sizes less than or equal to 0.5mm, 5 to 10% of high-purity magnesia sand fine powder having particle sizes less than or equal to 0.044mm, 2 to 5% of tar resin or paraffin, and 2 to 5% of fused zirconia. The preparation method comprises the following steps of raw material proportioning, raw material blending, mixing, molding, sintering, waxing and vacuum aluminium foil package. The high-density ultrahigh-purity magnesia-calcium brick has a high product compact degree and excellent hydration resistance. The high-density ultrahigh-purity magnesia-calcium brick has high purity and thus high slag corrosion resistance and high flushing resistance are obtained. Compared with other like products, the high-density ultrahigh-purity magnesia-calcium brick has better thermal shock resistance. The high-density ultrahigh-purity magnesia-calcium brick contains a large amount of dissociative CaO and thus the high-density ultrahigh-purity magnesia-calcium brick has excellent molten steel cleaning performances and is especially suitable for production of high cleanliness steel such as stainless steel.
Description
Technical field
The present invention relates to fire resisting material field, particularly ultra-pure magnesia-calcium brick of a kind of high-compactness and preparation method thereof.
Background technology
The refractory materials of the smelting usefulness of present domestic stainless steel and special steel generally adopts and burns till magnesia-calcium brick, this class magnesia-calcium brick compactness extent is not high, void content is generally at 8-15%, volume density is at 2.90-3.0g/cm3, in the use procedure, its erosion-resisting characteristics is not good around AOD slag line and air pressure gun, and its scour resistance is also undesirable in the bag bottom of stainless steel ladle, the bottleneck that these all become in the use procedure rolls off the production line and cause in advance.
Summary of the invention
The present invention has overcome above-mentioned the deficiencies in the prior art, provides a kind of volume density large, is difficult for aquation, cracking, ultra-pure magnesia-calcium brick of high-compactness that slag corrosion resistance ability and erosion resistibility are strong and preparation method thereof.
Technical scheme of the present invention is achieved in that
The ultra-pure magnesia-calcium brick of a kind of high-compactness is characterized in that by following raw materials by weight formulated:
The calcium magnesia sand 9-16% of calcium magnesia sand 9-16%, the 3-5mm of 5-7mm,
The calcium magnesia sand 13-32% of calcium magnesia sand 9-16%, the 0.5-1mm of 1-3mm,
The calcium magnesia sand 5-25% of≤0.5mm ,≤the 97 highly-purity magnesite fine powder 5-10% of 0.044mm, wedding agent: tar resin or paraffin 2-5%, additive: electric-melting zirconia 2-5%.
The preparation method of the ultra-pure magnesia-calcium brick of a kind of high-compactness is characterized in that may further comprise the steps:
(1), calcium magnesia sand is carried out Mechanical Crushing through jaw crusher, oppositely rolling roller crusher, cone crusher, send into again ball mill and carry out fine grinding, through after the screen cloth screening, make granularity and be 5-7mm, 3-5mm, 1-3mm, 0.5-1mm ,≤calcium magnesia sand of five kinds of specifications of 0.5mm;
(2), weight percent is on request prepared burden, send in the high speed mixer through the material for preparing and to mix, its order of addition(of ingredients) is the calcium magnesia sand of 5-7mm, the calcium magnesia sand of 3-5mm, the calcium magnesia sand of 1-3mm, 0.5-1mm calcium magnesia sand, then add tar resin or paraffin, the calcium magnesia sand of≤0.5mm and≤the 97 highly-purity magnesite fine powders of 0.044mm, add at last electric-melting zirconia, the total time of batch mixing is no less than 25 minutes again;
(3), the material that mixes is added in the mould, carry out extrusion forming;
(4), the blank of moulding is sent in the tunnel furnace, carried out high temperature and burn till;
(5), behind the blank kiln discharge, for preventing aquation, waxdip is processed immediately, tests at last and packs
Adopted the invention has the beneficial effects as follows of technique scheme:
The ultra-pure magnesia-calcium brick of a kind of high-compactness that the present invention relates to by rational grain composition and in the selection aspect the wedding agent, has improved the compactness extent of product, the void content of product＜5%, volume density 〉=3.10g/cm greatly
3, cold crushing strength 〉=60MPa.And added partially stabilized type electric-melting zirconia and highly-purity magnesite fine powder, improved the thermal shock resistance energy of goods, not only can be used on the smelting equipment AOD stove of stainless steel and special steel, also can be applied on the refining ladle.Owing to containing a large amount of free calcium oxides in the goods, can adsorb harmful inclusion such as S, P in the molten steel simultaneously, be conducive to greatly the production of Clean Steel.
The present invention is through the treatment process of rational batching and science, the ultra-pure magnesia-calcium brick compactness extent of this high-compactness of preparation is high, volume density is large, be difficult for aquation, cracking, slag corrosion resistance ability and erosion resistibility are strong, high-temperature stability is good, use and be not prone to peeling phenomenon, high life, can be applicable to stainless steel, the steel melting furnace of the high tensile steels such as special steel, in refining furnace and the ladle, particularly at the AOD slag line, easily to wash away the position effect very obvious in these easy erosions around the air pressure gun and at the bottom of the bag of stainless steel ladle, can adapt to severe cruelization of its operational condition, raises such as refining temperature, the VD processing rate increases, the high vacuum hold-time prolongs etc.
Embodiment
The specific embodiment of the present invention is as follows:
Embodiment: produce 100 tons of ultra-pure magnesia-calcium bricks of high-compactness;
1. at first determine production formula, i.e. various raw-material ratios.Prescription is: calcium magnesia sand 7-5mm 12%, 5-3mm15%, 3-1mm 22%, 1-0.5mm 22% ,≤0.5mm 18%; ≤ 0.044mm 97 highly-purity magnesite fine powders 5%; Tar resin 3%; Electric-melting zirconia 3%.
According to the consumption that calculates each raw material be: 10 tons of calcium magnesia sand 7-5mm, 15 tons of 5-3mm, 22 tons of 3-1mm, 22 tons of 1-0.5mm ,≤23 tons of 0.5mm; 3 tons of tar resins; 3 tons of electric-melting zirconias.
2. prepare burden and batch mixing.According to above production formula, to prepare burden, the gross weight of each batching is 1000kg, concrete batching is: calcium magnesia sand 7-5mm 120kg, 5-3mm 150kg, 3-1mm220kg, 1-0.5mm220kg ,≤0.5mm 180kg; ≤ 0.044mm97 highly-purity magnesite fine powder 50kg; Tar resin 30kg; Electric-melting zirconia 30kg.
Then the raw material for preparing is sequentially added into and carries out batch mixing in the muller.Order of addition(of ingredients) is: calcium magnesia sand particulate material (7-5mm, 5-3mm, 3-1mm, 1-0.5mm) → tar resin → calcium magnesia sand fine powder (≤0.5mm), 97 highly-purity magnesite fine powders, electric-melting zirconia additive.Mixing time is no less than 25min.
3. moulding.Mixed pug is transported to the fitting room carries out moulding, the time of midfeather is no more than 30min.
After pouring into pug in the mould, need to be flat the pug strip.Heavy principle was carried out after the pressurization dynamics adopted elder generation light during moulding.
4. burn till., enter tunnel furnace and burn till after the qualified and loading of kiln until the green compact inspection of semifinished product, firing temperature is controlled at 1680-1700 ℃, and soaking time is at 8-10h, and total firing time is no less than 72h at once.Firing process is the pass key control technique of the ultra-pure magnesia-calcium brick of high-compactness.
5. check and packing.For preventing aquation, after the formed product, should test immediately and then carry out the waxdip processing.Packing adopts aluminium foil to carry out vacuum packaging.
6. the physics and chemistry of the ultra-pure magnesia-calcium brick of high-compactness that makes at last detects index: MgO 76.34%, CaO21.70%, silicon oxide+aluminium sesquioxide+ferric oxide 1.96%, void content 3.6%, volume density 3.12g/cm
3, cold crushing strength 72MPa.
Claims (2)
1. ultra-pure magnesia-calcium brick of high-compactness is characterized in that by following raw materials by weight formulated:
The calcium magnesia sand 9-16% of calcium magnesia sand 9-16%, the 3-5mm of 5-7mm,
The calcium magnesia sand 13-32% of calcium magnesia sand 9-16%, the 0.5-1mm of 1-3mm,
The calcium magnesia sand 5-25% of≤0.5mm ,≤the 97 highly-purity magnesite fine powder 5-10% of 0.044mm, wedding agent: tar resin or paraffin 2-5%, additive: electric-melting zirconia 2-5%.
2. the preparation method of the ultra-pure magnesia-calcium brick of high-compactness is characterized in that may further comprise the steps:
(1), calcium magnesia sand is carried out Mechanical Crushing through jaw crusher, oppositely rolling roller crusher, cone crusher, send into again ball mill and carry out fine grinding, through after the screen cloth screening, make granularity and be 5-7mm, 3-5mm, 1-3mm, 0.5-1mm ,≤calcium magnesia sand of five kinds of specifications of 0.5mm;
(2), weight percent is on request prepared burden, send in the high speed mixer through the material for preparing and to mix, its order of addition(of ingredients) is the calcium magnesia sand of 5-7mm, the calcium magnesia sand of 3-5mm, the calcium magnesia sand of 1-3mm, 0.5-1mm calcium magnesia sand, then add tar resin wedding agent or paraffin wedding agent, the calcium magnesia sand of≤0.5mm and≤the 97 highly-purity magnesite fine powders of 0.044mm, add at last the electric-melting zirconia additive, the total time of batch mixing is no less than 25 minutes again;
(3), the material that mixes is added in the mould, carry out extrusion forming;
(4), the blank of moulding is sent in the tunnel furnace, carried out high temperature and burn till;
(5), behind the blank kiln discharge, for preventing aquation, waxdip is processed immediately, tests at last and packs.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103396142A (en) * | 2013-08-14 | 2013-11-20 | 辽宁中镁高温材料有限公司 | Composite magnesium-calcium brick having low heat conductivity and high service performance and manufacturing method thereof |
| CN103951441A (en) * | 2014-04-03 | 2014-07-30 | 海城市中兴高档镁质砖有限公司 | Method for producing unfired konite brick by using konite waste brick |
| CN106554209A (en) * | 2015-09-28 | 2017-04-05 | 洛阳暖盈电子技术有限公司 | A kind of new magnesite-dolomite refractories |
| CN107244923A (en) * | 2016-11-30 | 2017-10-13 | 辽宁科技大学 | It is a kind of to increase the method for unfired magnesia-calcium brick medium temperature intensity |
| CN108395260A (en) * | 2018-02-07 | 2018-08-14 | 山西禄纬堡太钢耐火材料有限公司 | The preparation method and magnesia-calcium brick of a kind of magnesia-calcium brick bonding agent and its magnesia-calcium brick |
| CN111943692A (en) * | 2020-06-30 | 2020-11-17 | 辽宁东和新材料股份有限公司 | High-performance magnesia-calcium brick and preparation method thereof |
| CN112341161A (en) * | 2020-10-26 | 2021-02-09 | 北京利尔高温材料股份有限公司 | Anti-stripping unburned magnesium-calcium-carbon brick and preparation method thereof |
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| CN101973774A (en) * | 2010-10-28 | 2011-02-16 | 中钢集团洛阳耐火材料研究院有限公司 | Hydration-resistant high-calcium magnesia-calcium brick and production process thereof |
| CN102276272A (en) * | 2011-07-11 | 2011-12-14 | 浙江金磊高温材料股份有限公司 | High-calcium magnesia-calcia bricks and preparation method thereof |
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| CN101973774A (en) * | 2010-10-28 | 2011-02-16 | 中钢集团洛阳耐火材料研究院有限公司 | Hydration-resistant high-calcium magnesia-calcium brick and production process thereof |
| CN102276272A (en) * | 2011-07-11 | 2011-12-14 | 浙江金磊高温材料股份有限公司 | High-calcium magnesia-calcia bricks and preparation method thereof |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103396142A (en) * | 2013-08-14 | 2013-11-20 | 辽宁中镁高温材料有限公司 | Composite magnesium-calcium brick having low heat conductivity and high service performance and manufacturing method thereof |
| CN103396142B (en) * | 2013-08-14 | 2014-10-22 | 辽宁中镁高温材料有限公司 | Composite magnesium-calcium brick having low heat conductivity and high service performance and manufacturing method thereof |
| CN103951441A (en) * | 2014-04-03 | 2014-07-30 | 海城市中兴高档镁质砖有限公司 | Method for producing unfired konite brick by using konite waste brick |
| CN103951441B (en) * | 2014-04-03 | 2015-08-26 | 海城市中兴高档镁质砖有限公司 | A kind of konite brick that gives up that utilizes is produced and is not burnt the method for konite brick |
| CN106554209A (en) * | 2015-09-28 | 2017-04-05 | 洛阳暖盈电子技术有限公司 | A kind of new magnesite-dolomite refractories |
| CN107244923A (en) * | 2016-11-30 | 2017-10-13 | 辽宁科技大学 | It is a kind of to increase the method for unfired magnesia-calcium brick medium temperature intensity |
| CN108395260A (en) * | 2018-02-07 | 2018-08-14 | 山西禄纬堡太钢耐火材料有限公司 | The preparation method and magnesia-calcium brick of a kind of magnesia-calcium brick bonding agent and its magnesia-calcium brick |
| CN111943692A (en) * | 2020-06-30 | 2020-11-17 | 辽宁东和新材料股份有限公司 | High-performance magnesia-calcium brick and preparation method thereof |
| CN111943692B (en) * | 2020-06-30 | 2022-05-10 | 辽宁东和新材料股份有限公司 | High-performance magnesia-calcium brick and preparation method thereof |
| CN112341161A (en) * | 2020-10-26 | 2021-02-09 | 北京利尔高温材料股份有限公司 | Anti-stripping unburned magnesium-calcium-carbon brick and preparation method thereof |
| CN112341161B (en) * | 2020-10-26 | 2022-06-24 | 北京利尔高温材料股份有限公司 | Anti-stripping unburned magnesium-calcium-carbon brick and preparation method thereof |
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Application publication date: 20130424 |