CN102225867B - Silicon carbide furnace door brick for ore-smelting electric furnace and preparation method thereof - Google Patents
Silicon carbide furnace door brick for ore-smelting electric furnace and preparation method thereof Download PDFInfo
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- CN102225867B CN102225867B CN 201110135193 CN201110135193A CN102225867B CN 102225867 B CN102225867 B CN 102225867B CN 201110135193 CN201110135193 CN 201110135193 CN 201110135193 A CN201110135193 A CN 201110135193A CN 102225867 B CN102225867 B CN 102225867B
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Abstract
The invention belongs to the technical field of steel smelting non-metal refractory materials and discloses a silicon carbide furnace door brick for an ore-smelting electric furnace and a preparation method thereof. The silicon carbide furnace door brick is made of a furnace door brick material, anti-oxidation paint and water which accounts for 4-5.5% of furnace door brick material based on weight percent, wherein the furnace door brick material consists of the following raw materials in percentage by weight: 78-85% of industrial silicon carbide, 5-10% of refractory clay, 2-5% of silicon dioxide micropowder, 1-2% of metal silicon micropowder and 3-5% of pure calcium aluminate cement; and the anti-oxidation paint consists of the following raw materials by weight percent: 50-60% of quartz powder, 5-10% of refractory clay, 8-12% of potash feldspar, 8-12% of boric acid and 15-20% of sodium silicate. The preparation method comprises the following steps: evenly stirring and mixing the materials taken in the raw material proportion of the anti-oxidation paint so as to prepare the anti-oxidation paint for later use; adding water in the materials taken in the raw material proportion of the furnace door brick material for evenly stirring and mixing, pouring in a mould and carrying out vibratory moulding so as to obtain a semi-finished product; and evenly brushing a layer of anti-oxidation paint on the surface of the semi-finished product after moulding, and sintering at the temperature of 1400-1550 DEG C after maintenance and drying. By using the preparation method, the service life of the furnace door brick is prolonged to above270 days.
Description
Technical field
The invention belongs to smelting iron and steel non-metallic refractory technical field, particularly silicon carbide furnace door brick for ore-smelting electric furnace and preparation method thereof.
Background technology
The fire door position of ore-smelting furnace is owing to need to frequently stand washing away and the chemical erosion effect of high temperature furnace slag and flow of molten metal, and often want in running order during with closed state in the frequent transitions of high temperature and two kinds of varying environments of low temperature, need to stand the test of rapid heat cycle state, so the technical feature that the refractory brick at the fire door position of ore-smelting furnace can reach becomes the key link that affects the furnace lining bulk life time.
Existing ore-smelting furnace fire door position is mainly built by laying bricks or stones by high alumina brick and is formed, and does not aim at the furnace door brick of the harsh working conditions in suitable fire door position that Designing Submerged Arc Furnace makes.This traditional its major defect of fire door of being built by laying bricks or stones by high alumina brick is: 1, washing away of high temperature furnace slag and molten metal frequently stood in the fire door position, the deficiency of the wear resisting property of high aluminium material, high alumina furnace door brick anti-erosion erosion resistibility is relatively poor, causes the fire door position at first to be scrapped.The formed brick body in fire door position of 2, being built by laying bricks or stones by high alumina brick is less and brickwork joint is more, so that the brickwork joint part easily at first suffers erosion and wash away and damage, and the whole soundness in fire door position is lower, easily forms the whole fracture damage in fire door position.3, the fire door position often is in the continuous switching process of work and sealing two states, need to frequently stand the test of rapid heating and cooling state, the thermostability of the brick body made of tradition high aluminium material can satisfy the requirement of rapid heat cycle severe rugged environment condition, thereby the situations such as the fracture of brick body is impaired easily occur.Above defective affects the ore-smelting furnace whole service life so that the ore-smelting furnace fire door life-span that traditional high alumina brick is built by laying bricks or stones can only reach at most 90 days.
Summary of the invention
The object of the present invention is to provide silicon carbide furnace door brick for ore-smelting electric furnace of a kind of long service life and preparation method thereof.
For achieving the above object, the technical scheme taked of the present invention is as follows:
Silicon carbide furnace door brick for ore-smelting electric furnace is made by furnace door brick material, the water, the antioxidizing paint that account for furnace door brick material weight percentage 4 ~ 5.5%; Described furnace door brick material is comprised of the raw material of following weight percentage: industrial silicon carbide 78 ~ 85%, fireclay 5 ~ 10%, fine silica powder 2 ~ 5%, Pure Silicon Metal micro mist 1 ~ 2%, pure calcium aluminate cement 3 ~ 5%; Described antioxidizing paint is comprised of the raw material of following weight percentage: silica powder 50 ~ 60%, fireclay 5 ~ 10%, potassium felspar sand 8 ~ 12%, boric acid 8 ~ 12%, water glass solution 15 ~ 20%.Described water glass solution is commercial liquid glass.
Preferably, in the furnace door brick material: the granularity of industrial silicon carbide is preferred≤3mm, and the granularity of fireclay, fine silica powder, Pure Silicon Metal micro mist and pure calcium aluminate cement is preferred 200 ~ 300 orders all.
Preferably, in the antioxidizing paint: the granularity of silica powder, fireclay, potassium felspar sand and boric acid is preferred≤0.088mm all.
Further, the length of furnace door brick * wide * thick specification is: 600mm * 650mm * 200mm is between 700mm * 850mm * 400mm.
The preparation method of silicon carbide furnace door brick for ore-smelting electric furnace, step is as follows:
(1), press antioxidizing paint proportioning raw materials feeding, mix and make antioxidizing paint, for subsequent use;
(2), press furnace door brick material proportioning raw materials feeding, add water and mix, in mould the cast and vibratory compaction, get work in-process;
(3), after the moulding at the even brushing one deck of surface of semi-finished antioxidizing paint, after maintenance, oven dry, 1400 ~ 1550 ℃ of lower sinter moldings.
Preferably, bake out temperature is preferably 110 ~ 200 ℃, and drying time is preferably 72 ~ 96h.
Preferably, sintering time is preferably 8 ~ 24h.
Beneficial effect of the present invention:
1, the starting material that use of ore-smelting furnace furnace door brick of the present invention adopt industrial silicon carbide to be main raw, improve thermal stability and the wear resisting property of the emergency heat and cooling property resistance chilling of goods.
2, in material, add fine silica powder and Pure Silicon Metal micro mist as the ceramic additive, furnace door brick goods internal microcellular structure is eliminated or reduction.Adopting simultaneously at product surface increases siliceous inoxidzable coating, and forms the production technique of product surface ceramic through oversintering, thereby increases largely surface oxidation-resistant performance and the wear-resisting and erosion-resisting characteristics of ore-smelting furnace furnace door brick goods.
3, ore-smelting furnace furnace door brick of the present invention is designed to whole large specification scheme, brick body specifications design be 600mm * 650mm * 200mm between 700mm * 850mm * 400mm, thereby reach the purpose of increase fire door position overall construction intensity.
4, moulding process is improved to integral cast vibratory compaction by the layering ramming, increases the even and compactness of goods finished product.
5, sintering temperature is controlled between 1400 ℃ ~ 1550 ℃, and sintering time is controlled at more than the 8h.
6, the main performance index that reaches of ore-smelting furnace furnace door brick of the present invention: void content≤19%, volume density 〉=2.5g/cm
3, emergency heat and cooling property resistance chilling＞30 time, cold crushing strength＞70Mpa, load softening point 〉=1620 ℃.The furnace door brick whole service life extended to more than 270 days.
Embodiment
In following examples, in the furnace door brick material: the granularity≤3mm of industrial silicon carbide, the granularity of fireclay, fine silica powder, Pure Silicon Metal micro mist and pure calcium aluminate cement is 200 ~ 300 orders; In the antioxidizing paint: the granularity of silica powder, fireclay, potassium felspar sand and boric acid all≤0.088mm.
Embodiment 1
Silicon carbide furnace door brick for ore-smelting electric furnace is made by furnace door brick material, the water, the antioxidizing paint that account for furnace door brick material weight percentage 5%; Described furnace door brick material comprises the raw material of following weight percentage: industrial silicon carbide 82%, fireclay 9%, fine silica powder 4%, Pure Silicon Metal micro mist 1%, pure calcium aluminate cement 4%; Described antioxidizing paint is comprised of the raw material of following weight percentage: silica powder 56%, fireclay 7%, potassium felspar sand 12%, boric acid 9%, water glass solution 16%.
The preparation method, step is as follows:
(1), press antioxidizing paint proportioning raw materials feeding, mix and make antioxidizing paint, for subsequent use;
(2), press furnace door brick material proportioning raw materials feeding, add water and mix, in mould the cast and vibratory compaction, get work in-process;
(3), after the moulding at the even brushing one deck of surface of semi-finished antioxidizing paint, behind maintenance, 150 ℃ of oven dry 80h, 1500 ℃ of lower sintering 10h become 650mm * 750mm * 300mm(long * wide * thick) syphon.
Embodiment 2
Silicon carbide furnace door brick for ore-smelting electric furnace is made by furnace door brick material, the water, the antioxidizing paint that account for furnace door brick material weight percentage 4%; Described furnace door brick material comprises the raw material of following weight percentage: industrial silicon carbide 78%, fireclay 10%, fine silica powder 5%, Pure Silicon Metal micro mist 2%, pure calcium aluminate cement 5%; Described antioxidizing paint is comprised of the raw material of following weight percentage: silica powder 50%, fireclay 6%, potassium felspar sand 12%, boric acid 12%, water glass solution 20%.
The preparation method, step is as follows:
(1), press antioxidizing paint proportioning raw materials feeding, mix and make antioxidizing paint, for subsequent use;
(2), press furnace door brick material proportioning raw materials feeding, add water and mix, in mould the cast and vibratory compaction, get work in-process;
(3), after the moulding at the even brushing one deck of surface of semi-finished antioxidizing paint, behind maintenance, 110 ℃ of oven dry 72h, 1400 ℃ of lower sintering 8h become 600mm * 650mm * 200mm(long * wide * thick) syphon.
Embodiment 3
Silicon carbide furnace door brick for ore-smelting electric furnace is made by furnace door brick material, the water, the antioxidizing paint that account for furnace door brick material weight percentage 5.5%; Described furnace door brick material comprises the raw material of following weight percentage: industrial silicon carbide 85%, fireclay 5%, fine silica powder 5%, Pure Silicon Metal micro mist 1.5%, pure calcium aluminate cement 3.5%; Described antioxidizing paint is comprised of the raw material of following weight percentage: silica powder 60%, fireclay 5%, potassium felspar sand 8%, boric acid 8%, water glass solution 19%.
The preparation method, step is as follows:
(1), press antioxidizing paint proportioning raw materials feeding, mix and make antioxidizing paint, for subsequent use;
(2), press furnace door brick material proportioning raw materials feeding, add water and mix, in mould the cast and vibratory compaction, get work in-process;
(3), after the moulding at the even brushing one deck of surface of semi-finished antioxidizing paint, behind maintenance, 180 ℃ of oven dry 90h, in 1450 ℃ of lower sintering 20h moulding, make 700mm * 800mm * 400mm(long * wide * thick) syphon.
Embodiment 4
Silicon carbide furnace door brick for ore-smelting electric furnace is made by furnace door brick material, the water, the antioxidizing paint that account for furnace door brick material weight percentage 5.5%; Described furnace door brick material comprises the raw material of following weight percentage: industrial silicon carbide 85%, fireclay 8%, fine silica powder 2%, Pure Silicon Metal micro mist 2%, pure calcium aluminate cement 3%; Described antioxidizing paint is comprised of the raw material of following weight percentage: silica powder 55%, fireclay 10%, potassium felspar sand 10%, boric acid 10%, water glass solution 15%.
The preparation method, step is as follows:
(1), press antioxidizing paint proportioning raw materials feeding, mix and make antioxidizing paint, for subsequent use;
(2), press furnace door brick material proportioning raw materials feeding, add water and mix, in mould the cast and vibratory compaction, get work in-process;
(3), after the moulding at the even brushing one deck of surface of semi-finished antioxidizing paint, behind maintenance, 200 ℃ of oven dry 96h, in 1550 ℃ of lower sintering 24h moulding, make 700mm * 850mm * 400mm(long * wide * thick) syphon.
Above embodiment 1 ~ 4 gained syphon is tested main performance index: void content≤19%, volume density 〉=2.5g/cm
3, emergency heat and cooling property resistance chilling＞30 time, cold crushing strength＞70Mpa, load softening point 〉=1620 ℃.The furnace door brick whole service life extended to more than 270 days.
Claims (7)
1. silicon carbide furnace door brick for ore-smelting electric furnace is characterized in that being made by furnace door brick material, the water, the antioxidizing paint that account for furnace door brick material weight percentage 4 ~ 5.5%; Described furnace door brick material is comprised of the raw material of following weight percentage: industrial silicon carbide 78 ~ 85%, fireclay 5 ~ 10%, fine silica powder 2 ~ 5%, Pure Silicon Metal micro mist 1 ~ 2%, pure calcium aluminate cement 3 ~ 5%; Described antioxidizing paint is comprised of the raw material of following weight percentage: silica powder 50 ~ 60%, fireclay 5 ~ 10%, potassium felspar sand 8 ~ 12%, boric acid 8 ~ 12%, water glass solution 15 ~ 20%.
2. silicon carbide furnace door brick for ore-smelting electric furnace as claimed in claim 1, it is characterized in that in the furnace door brick material: the granularity≤3mm of industrial silicon carbide, the granularity of fireclay, fine silica powder, Pure Silicon Metal micro mist and pure calcium aluminate cement is 200 ~ 300 orders.
3. silicon carbide furnace door brick for ore-smelting electric furnace as claimed in claim 2 is characterized in that in the antioxidizing paint: the granularity of silica powder, fireclay, potassium felspar sand and boric acid all≤0.088mm.
4. silicon carbide furnace door brick for ore-smelting electric furnace as claimed in claim 3, it is characterized in that the length of furnace door brick * wide * thick specification is: 600mm * 650mm * 200mm is between 700mm * 850mm * 400mm.
5. such as the preparation method of the described silicon carbide furnace door brick for ore-smelting electric furnace of any one of claim 1 ~ 4, it is characterized in that step is as follows:
(1), press antioxidizing paint proportioning raw materials feeding, mix and make antioxidizing paint, for subsequent use;
(2), press furnace door brick material proportioning raw materials feeding, add water and mix, in mould the cast and vibratory compaction, get work in-process;
(3), after the moulding at the even brushing one deck of surface of semi-finished antioxidizing paint, after maintenance, oven dry, 1400 ~ 1550 ℃ of lower sinter moldings.
6. the preparation method of silicon carbide furnace door brick for ore-smelting electric furnace as claimed in claim 5, it is characterized in that: bake out temperature is 110 ~ 200 ℃, drying time is 72 ~ 96h.
7. the preparation method of silicon carbide furnace door brick for ore-smelting electric furnace as claimed in claim 6, it is characterized in that: sintering time is 8 ~ 24h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201110135193 CN102225867B (en) | 2011-05-24 | 2011-05-24 | Silicon carbide furnace door brick for ore-smelting electric furnace and preparation method thereof |
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| CN 201110135193 CN102225867B (en) | 2011-05-24 | 2011-05-24 | Silicon carbide furnace door brick for ore-smelting electric furnace and preparation method thereof |
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| CN102225867A CN102225867A (en) | 2011-10-26 |
| CN102225867B true CN102225867B (en) | 2013-04-17 |
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| CN103896607B (en) * | 2014-03-03 | 2015-07-29 | 郑州市瑞沃耐火材料有限公司 | The alkaline anhydrous stemming of ore-smelting furnace |
| CN105693289B (en) * | 2016-03-21 | 2018-05-29 | 河南省西保冶材集团有限公司 | A kind of submersed nozzle slag line shrinkproof glaze protective coating and preparation method thereof |
| CN106065279B (en) * | 2016-06-02 | 2017-12-22 | 聊城鼎硕新材料有限公司 | A kind of antioxidizing paint and its application method |
| CN106278323A (en) * | 2016-08-22 | 2017-01-04 | 河南鑫诚耐火材料股份有限公司 | A kind of carbon baking furnace flue lining heat radiation coating and preparation method thereof |
| CN106986552B (en) * | 2017-04-17 | 2020-07-14 | 上海强华实业股份有限公司 | Method for manufacturing high-temperature-resistant quartz glass |
| CN109650912A (en) * | 2017-10-10 | 2019-04-19 | 湖南瑞新机械制造有限公司 | Molybdenum carbon silicon combined high temperature refractory material |
| CN110894163A (en) * | 2019-12-09 | 2020-03-20 | 中钢宁夏耐研滨河新材料有限公司 | Application of silicon carbide composite material on calcium carbide furnace runner |
| CN114455959A (en) * | 2022-03-01 | 2022-05-10 | 天津固特节能环保科技有限公司 | Fire door brick for furnace and preparation method thereof |
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| CN1562893A (en) * | 2004-04-06 | 2005-01-12 | 山东中齐耐火材料有限公司 | Method for fabricating door brick in coke furnace |
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