CN105036748A - Silicon carbide brick and preparation method thereof - Google Patents
Silicon carbide brick and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a silicon carbide brick and a preparation method thereof. According to the silicon carbide brick, silica is used as a main raw material, and is divided into silica powder, silica coarse powder and silica fine powder according to grain diameters. The graphene silicon carbide brick is prepared from silica powder, silica coarse powder, silica fine powder, graphene, composite mineralizer and binding agents including nano-sized chromic oxide and nano-sized titanium oxide. The silicon carbide brick is a graphene silicon carbide brick with excellent thermal shock resistance, strong slag and alkaline metal corrosion resistance, excellent washing resistance, excellent heat-isolation and insulation performance and good high-temperature volume stability; the contact inside the silicon carbide brick is closer due to the graphene, so that the stress generated by expansion when the brick is burnt can be reduced, and the brick is prevented from loosening or cracking; and due to the high strength of the graphene, the excellent mechanical performance of the silicon carbide brick is guaranteed, and the acid and alkali corrosion resistance of the silicon carbide brick can be improved.
Description
Technical field
The present invention relates to technical field of refractory materials, particularly relate to a kind of good in thermal shock, slag-resistant, basic metal erosion performance are strong, silicon carbide brick of resistance to erosion, heat preservation and insulation excellence, high volume good stability and preparation method thereof.
Background technology
Along with the growing tension of the energy, various countries are to the development of hot industry energy-saving material, production and use pay attention to day by day.Silica brick, owing to having the characteristics such as refractoriness under load point is high, high volume good stability, life-time service do not shrink, is widely applied and studies in lightweight refractory system.
Expand because the quick crystal conversion of silica in heat-processed produces comparatively large vol, make burning till than other refractory materials difficulties of silica brick.The core technology manufacturing silica brick is the choice and utilization of mineralizer, and its objective is it is to control silica brick in sintering process, the crystal conversion due to silica produces the volumetric expansion that larger stress causes in brick, avoids silica brick to ftracture when burning till.Requiring when silica brick burns till to change quartz into stable high temperature mineral phase tridymite and cristobalite as much as possible, in order to promote this conversion, usually in making silica brick process, adding mineralizer.Mineralizer can generate the oxide compound of liquid phase with silicon dioxde reaction, and its effect is the refractoriness significantly not reducing goods accelerating quartz transition while, and because of the stress produced that expands when adobe can be suppressed to burn till, and prevents the loose or cracking of goods.
The mineralizer of the actual use of current making silica brick is ferric oxide and calcium oxide mostly, and they not only have These characteristics, and can ensure that silica brick has good mechanical behavior under high temperature.But the ferric oxide used in production and calcium oxide add with fine powder form and milk of lime form respectively, the former granularity is thin not, disperses even not in silica brick; What in fact the latter added is calcium hydroxide, and its lime milk solution easily flocculates, and not easily disperses, therefore poor as mineralizer effect.
Geim and Novoselov of Man Chesidun university of Britain in 2004 obtains self-existent two-dimensional graphene (Gra-phene by tape stripping high starch breeding, GN), since crystal, Graphene has become one of extremely concerned study hotspot of material science.In fact Graphene is exactly the graphite of monoatomic layer, and it has unique two-dirnentional structure and excellent mechanics, thermodynamics, optics and electric property.
Graphene is at present the thinnest is in the world the hardest nano material also, and it is almost completely transparent, to the light absorbing 2.3%, thermal conductivity up to 5300W/mk, higher than carbon nanotube and diamond.Graphene is a kind of novel material of the individual layer sheet structure be made up of carbon atom, has intensity high, and specific surface area is large, high chemical reactivity, the feature of high fillibility.
Chinese patent publication No. CN102557684A, date of publication on July 11st, 2012, name is called silica brick for coke oven, and described silica brick comprises stock and adjunct, represents with weight proportion, silica meal 200-500 part in composition of raw materials, powder 330-380 part in silica, silica fine powder 80-130 part, as residual silica brick 80-120 part of chamotte powder, auxiliary material comprise account for the mineralizer of raw material gross weight 1.2%, the milk of lime of 8% and 1% paper pulp, mineralizer is by the manganese powder of Manganse Dioxide content >=25%; The iron phosphorus powder of ferrous oxide content >=65% mixes in the ratio of 1:1; Powder, silica fine powder and the residual silica brick as chamotte powder in silica meal, silica added in wet stone roller, then adding mineralizer and be dry mixed 4-5 minute, then adding milk of lime, after rolling 10-15 minute, then add paper pulp, mixing even to pug, roll, shaping base.Its weak point is, ferric oxide granularity is thin not, disperses even not in silica brick; What in fact calcium oxide added is calcium hydroxide, and its lime milk solution easily flocculates, and not easily disperses, therefore poor as mineralizer effect.
Summary of the invention
The object of the invention is to solve ferric oxide granularity when existing silica brick makes thin not, disperseing even not in silica brick; What in fact calcium oxide added is calcium hydroxide, its lime milk solution easily flocculates, the defect of not easily disperseing and a kind of good in thermal shock is provided, thermal-shock resistance, slag-resistant, basic metal erosion performance are strong, and resistance to erosion, heat preservation and insulation are excellent, the silicon carbide brick of high volume good stability.
Another object of the present invention is the preparation method in order to provide this silica brick.
To achieve these goals, the present invention is by the following technical solutions:
A kind of silicon carbide brick, take silica as main raw material, main raw material silica is divided into silica end, silica meal and silica fine powder by particle diameter, and described silicon carbide brick consists of by following weight percent: silica end 24-41%, silica meal 10-20%, silica fine powder 10-30%, Graphene 19-23%, composite mineralizer 1-3%, bonding agent 2-5%, nano chromium oxide 1-3% and nano-titanium oxide 2-5%.In the technical program, Graphene is a kind of novel material of the individual layer sheet structure be made up of carbon atom, has the feature of the high ﹑ specific surface area of strong degree large ﹑ height chemical reaction property ﹑ alive high fillibility; In silica brick, add Graphene makes silica brick interior contact more tight, thus because of the stress produced that expands when reducing to burn till, prevents goods from loosening or cracking; The high strength of Graphene ensure that the excellent mechanical property of silica brick, can promote antiacid caustic corrosion performance and the thermal-shock resistance of silica brick simultaneously.
As preferably, the particle diameter at silica end is 1-3mm, and the particle diameter of silica meal is 220-400 μm, and the particle diameter of silica fine powder is 0.05-0.1 μm.
As preferably, in the raw material composition of composite mineralizer, the weight part of each component is: 65 parts of granites, 35 parts of fluorites, 15 parts of potassium felspar sands, 30 parts of diatom oozes, 25 parts of medical stones, 5 parts of boron nitride, 8 parts of glass microballons and 15 parts of nano zine oxides.In the technical program, glass microballon granularity is suitable, good fluidity, dispersity is high, glass microballon is added in composite mineralizer, can be dispersed in silica brick internal height, acceleration of sintering, and silica brick is had evenly weave construction, improve intensity and the thermal shock resistance of goods, the granularity of nano zine oxide is tiny, can fill fine pores, reduce the void content of goods, improve volume density.
As preferably, described composite mineralizer is prepared by following steps: 1) granite, fluorite, potassium felspar sand and medical stone pulverized 100-300 mesh sieve respectively and removed impurity; 2) granite of step 1), fluorite, potassium felspar sand and medical stone are fired to 1150 DEG C respectively in 20 hours and are cooled to 25 DEG C; 3) step 2 is taken by formula) granite, fluorite, potassium felspar sand after process, add diatom ooze and boron nitride, adopt wet ball grinding fine grinding process to wear into slurry, then cross 400-500 mesh sieve; 4) slurry of step 3) is carried out drying, drying temperature 220-280 DEG C, spray glass microballon and nano zine oxide after being dried to moisture content≤3-5%, while sprinkling and ultrasonic vibration, ultrasonic power is 100-120kw.
As preferably, described bonding agent is Seaweed Extract, and the preparation method of this bonding agent is as follows: 1) clean: the tap water that marine alga raw material is 45-50 DEG C soaks 2-3 hour, then cleans up;
2) pulverize, centrifugal: the marine alga cleaned up, vacuum breaking, add the ethanol of marine alga volume 30 times and fourth diester solution soaking and boil, the volume ratio of ethanol and fourth diester is 1:1, then centrifugation is removed slag to obtain marine alga clear liquid, the rotating speed of whizzer is 4000 ~ 6000rpm, and centrifugation time is 15-20min;
3) nanofiltration: diluted by the pure water of marine alga clear liquid with 5-10 times of volume, then carries out dialysis by nanofiltration membrane and concentrates, and the 0.1-0.2 that the dialysis of marine alga clear liquid is concentrated into dilution front volume doubly obtains nanofiltration concentrated solution, and the molecular weight cut-off of described nanofiltration membrane is 600-700Da;
4) concentrate drying: the further vacuum concentration of nanofiltration concentrated solution to solid content is 40-60%, then in spray-dryer, spraying dry obtains the Powdered Seaweed Extract of water content 2-3%.
In the technical program, Seaweed Extract, as bonding agent, silica brick inside can be made to combine closely, and the lignosulfite that existing technique is commonly used can be more serious for environmental pollution, Seaweed Extract then extracts obtained from naturally occurring marine alga, environmental protection.
A kind of preparation method of silicon carbide brick, described preparation method is: each raw material weighs by above proportioning, through mixing, shaping, make adobe with mold pressing vibrating forming machine, adobe toasts 20-25 hour at 550-650 DEG C, then the adobe after toasting is put into impregnating autoclave and is vacuumized process, vacuum pressure is 0.05-0.08mpa, pressurize 40-50 minute, then adds soaker, continues pressurize 3-5 hour, adobe after dipping 1200-1285 DEG C of roasting, soaking time 75-85 hour.
As preferably, soaker is the refinery coke of molten state, and the add-on of soaker is that liquid level exceeds adobe upper surface 500-700mm.
Beneficial effect of the present invention is:
1) silica brick good in thermal shock of the present invention, slag-resistant, thermal-shock resistance, basic metal erosion performance are strong, and resistance to erosion, heat preservation and insulation are excellent, the silicon carbide brick of high volume good stability;
2) in composite mineralizer, add glass microballon, can be dispersed in silica brick internal height, acceleration of sintering, and silica brick is had evenly weave construction, improve the intensity of goods and thermal shock resistance;
3) granularity of nano zine oxide is tiny, can fill fine pores, reduces the void content of goods, improves volume density;
4) Graphene makes silica brick interior contact more tight, thus because of the stress produced that expands when reducing to burn till, prevents goods from loosening or cracking;
5) high strength of Graphene ensure that the excellent mechanical property of silica brick, can promote the antiacid caustic corrosion performance of silica brick simultaneously;
6) preparation method of the present invention is simple, abundant raw material, is applicable to factorial praluction.
Embodiment
Below in conjunction with specific embodiment, the present invention is further explained, the restriction not to its protection domain.
Dioxide-containing silica >=97wt% in the silica end that the present invention adopts, silica meal, silica fine powder, the particle diameter at silica end is 1-3mm, and the particle diameter of silica meal is 220-400 μm, and the particle diameter of silica fine powder is 0.05-0.1 μm.
In the present invention, if not refer in particular to, the raw material adopted all can be buied from market or this area is conventional, and the method in following embodiment, if no special instructions, is the ordinary method of this area.
Embodiment 1
A kind of silicon carbide brick, take silica as main raw material, main raw material silica is divided into silica end, silica meal and silica fine powder by particle diameter, and described silicon carbide brick consists of by following weight percent: silica end 41%, silica meal 20%, silica fine powder 10%, Graphene 19%, composite mineralizer 2%, bonding agent 2%, nano chromium oxide 1% and nano-titanium oxide 5%.
In the raw material composition of composite mineralizer, the weight part of each component is: 65 parts of granites, 35 parts of fluorites, 15 parts of potassium felspar sands, 30 parts of diatom oozes, 25 parts of medical stones, 5 parts of boron nitride, 8 parts of glass microballons and 15 parts of nano zine oxides.
Composite mineralizer is prepared by following steps: 1) granite, fluorite, potassium felspar sand and medical stone pulverized 100-300 mesh sieve respectively and removed impurity; 2) granite of step 1), fluorite, potassium felspar sand and medical stone are fired to 1150 DEG C respectively in 20 hours and are cooled to 25 DEG C; 3) step 2 is taken by formula) granite, fluorite, potassium felspar sand after process, add diatom ooze and boron nitride, adopt wet ball grinding fine grinding process to wear into slurry, then cross 400-500 mesh sieve; 4) slurry of step 3) is carried out drying, drying temperature 220 DEG C, sprays glass microballon and nano zine oxide after being dried to moisture content≤3-5%, and while sprinkling and ultrasonic vibration, ultrasonic power is 100kw.
Bonding agent is Seaweed Extract, and the preparation method of this bonding agent is as follows: 1) clean: the marine alga raw material tap water of 45 DEG C soaks 2 hours, then cleans up;
2) pulverize, centrifugal: the marine alga cleaned up, vacuum breaking, adds the ethanol of marine alga volume 30 times and fourth diester solution soaking and boils, the volume ratio of ethanol and fourth diester is 1:1, then centrifugation is removed slag to obtain marine alga clear liquid, and the rotating speed of whizzer is 4000rpm, and centrifugation time is 15min;
3) nanofiltration: diluted by the pure water of marine alga clear liquid with 5 times of volumes, then carries out dialysis by nanofiltration membrane and concentrates, the dialysis of marine alga clear liquid be concentrated into dilution 0.1 times of front volume nanofiltration concentrated solution, the molecular weight cut-off of described nanofiltration membrane is 600-700Da;
4) concentrate drying: the further vacuum concentration of nanofiltration concentrated solution to solid content is 40%, then in spray-dryer, spraying dry obtains the Powdered Seaweed Extract of water content 2%.
The preparation method of silicon carbide brick, described preparation method is: each raw material weighs by above proportioning, through mixing, shaping, make adobe with mold pressing vibrating forming machine, adobe is toasted 20 hours at 550 DEG C, then the adobe after toasting is put into impregnating autoclave and is vacuumized process, vacuum pressure is 0.05mpa, pressurize 40 minutes, then adds soaker, continues pressurize 3 hours, adobe after dipping 1200 DEG C of roastings, soaking time 75 hours.Soaker is the refinery coke of molten state, and the add-on of soaker is that liquid level exceeds adobe upper surface 500mm.
Embodiment 2
A kind of silicon carbide brick, take silica as main raw material, main raw material silica is divided into silica end, silica meal and silica fine powder by particle diameter, and described silicon carbide brick consists of by following weight percent: silica end 36%, silica meal 15%, silica fine powder 20%, Graphene 20%, composite mineralizer 1%, bonding agent 3%, nano chromium oxide 2% and nano-titanium oxide 3%.
In the raw material composition of composite mineralizer, the weight part of each component is: 65 parts of granites, 35 parts of fluorites, 15 parts of potassium felspar sands, 30 parts of diatom oozes, 25 parts of medical stones, 5 parts of boron nitride, 8 parts of glass microballons and 15 parts of nano zine oxides.
Composite mineralizer is prepared by following steps: 1) granite, fluorite, potassium felspar sand and medical stone pulverized 100-300 mesh sieve respectively and removed impurity; 2) granite of step 1), fluorite, potassium felspar sand and medical stone are fired to 1150 DEG C respectively in 20 hours and are cooled to 25 DEG C; 3) step 2 is taken by formula) granite, fluorite, potassium felspar sand after process, add diatom ooze and boron nitride, adopt wet ball grinding fine grinding process to wear into slurry, then cross 400-500 mesh sieve; 4) slurry of step 3) is carried out drying, drying temperature 260 DEG C, sprays glass microballon and nano zine oxide after being dried to moisture content≤3-5%, and while sprinkling and ultrasonic vibration, ultrasonic power is 110kw.
Bonding agent is Seaweed Extract, and the preparation method of this bonding agent is as follows: 1) clean: the marine alga raw material tap water of 48 DEG C soaks 2.5 hours, then cleans up;
2) pulverize, centrifugal: the marine alga cleaned up, vacuum breaking, adds the ethanol of marine alga volume 30 times and fourth diester solution soaking and boils, the volume ratio of ethanol and fourth diester is 1:1, then centrifugation is removed slag to obtain marine alga clear liquid, and the rotating speed of whizzer is 5000rpm, and centrifugation time is 18min;
3) nanofiltration: diluted by the pure water of marine alga clear liquid with 7 times of volumes, then carries out dialysis by nanofiltration membrane and concentrates, the dialysis of marine alga clear liquid be concentrated into dilution 0.2 times of front volume nanofiltration concentrated solution, the molecular weight cut-off of described nanofiltration membrane is 600-700Da;
4) concentrate drying: the further vacuum concentration of nanofiltration concentrated solution to solid content is 20%, then in spray-dryer, spraying dry obtains the Powdered Seaweed Extract of water content 2.5%.
The preparation method of silicon carbide brick, described preparation method is: each raw material weighs by above proportioning, through mixing, shaping, make adobe with mold pressing vibrating forming machine, adobe is toasted 23 hours at 600 DEG C, then the adobe after toasting is put into impregnating autoclave and is vacuumized process, vacuum pressure is 0.06mpa, pressurize 45 minutes, then adds soaker, continues pressurize 4 hours, adobe after dipping 1250 DEG C of roastings, soaking time 80 hours.Soaker is the refinery coke of molten state, and the add-on of soaker is that liquid level exceeds adobe upper surface 600mm.
Embodiment 3
A kind of silicon carbide brick, take silica as main raw material, main raw material silica is divided into silica end, silica meal and silica fine powder by particle diameter, and described silicon carbide brick consists of by following weight percent: silica end 24%, silica meal 10%, silica fine powder 30%, Graphene 23%, composite mineralizer 3%, bonding agent 5%, nano chromium oxide 3% and nano-titanium oxide 2%.
In the raw material composition of composite mineralizer, the weight part of each component is: 65 parts of granites, 35 parts of fluorites, 15 parts of potassium felspar sands, 30 parts of diatom oozes, 25 parts of medical stones, 5 parts of boron nitride, 8 parts of glass microballons and 15 parts of nano zine oxides.
Composite mineralizer is prepared by following steps: 1) granite, fluorite, potassium felspar sand and medical stone pulverized 100-300 mesh sieve respectively and removed impurity; 2) granite of step 1), fluorite, potassium felspar sand and medical stone are fired to 1150 DEG C respectively in 20 hours and are cooled to 25 DEG C; 3) step 2 is taken by formula) granite, fluorite, potassium felspar sand after process, add diatom ooze and boron nitride, adopt wet ball grinding fine grinding process to wear into slurry, then cross 400-500 mesh sieve; 4) slurry of step 3) is carried out drying, drying temperature 280 DEG C, sprays glass microballon and nano zine oxide after being dried to moisture content≤3-5%, and while sprinkling and ultrasonic vibration, ultrasonic power is 120kw.
Bonding agent is Seaweed Extract, and the preparation method of this bonding agent is as follows: 1) clean: the marine alga raw material tap water of 50 DEG C soaks 3 hours, then cleans up;
2) pulverize, centrifugal: the marine alga cleaned up, vacuum breaking, adds the ethanol of marine alga volume 30 times and fourth diester solution soaking and boils, the volume ratio of ethanol and fourth diester is 1:1, then centrifugation is removed slag to obtain marine alga clear liquid, and the rotating speed of whizzer is 6000rpm, and centrifugation time is 20min;
3) nanofiltration: diluted by the pure water of marine alga clear liquid with 10 times of volumes, then carries out dialysis by nanofiltration membrane and concentrates, the dialysis of marine alga clear liquid be concentrated into dilution 0.2 times of front volume nanofiltration concentrated solution, the molecular weight cut-off of described nanofiltration membrane is 600-700Da;
4) concentrate drying: the further vacuum concentration of nanofiltration concentrated solution to solid content is 60%, then in spray-dryer, spraying dry obtains the Powdered Seaweed Extract of water content 3%.
The preparation method of silicon carbide brick, described preparation method is: each raw material weighs by above proportioning, through mixing, shaping, make adobe with mold pressing vibrating forming machine, adobe is toasted 25 hours at 650 DEG C, then the adobe after toasting is put into impregnating autoclave and is vacuumized process, vacuum pressure is 0.08mpa, pressurize 50 minutes, then adds soaker, continues pressurize 5 hours, adobe after dipping 1285 DEG C of roastings, soaking time 85 hours.Soaker is the refinery coke of molten state, and the add-on of soaker is that liquid level exceeds adobe upper surface 700mm.
Comparative example 1, commercially available silica brick.
The performance of the silica brick of silica brick prepared by embodiment 1-3 and comparative example 1 is in table 1.
Table 1, performance
| Void content, % | Volume density, g/ Cm 3 | Compressive strength, Mpa | Remaining quartz, % | Conforming product rate % | |
| Embodiment 1 | 14.3 | 2.12 | 66.5 | 0.3 | 96 |
| Embodiment 2 | 14.7 | 2.08 | 68.1 | 0.7 | 95 |
| Embodiment 3 | 15.6 | 1.99 | 63.7 | 0.5 | 94 |
| Comparative example 1 | 22.3 | 1.9 | 45.6 | 2.1 | 80 |
As can be seen from Table 1, silica brick good in thermal shock prepared by the present invention, slag-resistant, basic metal erosion performance are strong, and resistance to erosion, heat preservation and insulation are excellent, high volume good stability.
Claims (7)
1. a silicon carbide brick, take silica as main raw material, it is characterized in that, main raw material silica is divided into silica end, silica meal and silica fine powder by particle diameter, and described silicon carbide brick consists of by following weight percent: silica end 24-41%, silica meal 10-20%, silica fine powder 10-30%, Graphene 19-23%, composite mineralizer 1-3%, bonding agent 2-5%, nano chromium oxide 1-3% and nano-titanium oxide 2-5%.
2. a kind of silicon carbide brick according to claim 1, is characterized in that, the particle diameter at silica end is 1-3mm, and the particle diameter of silica meal is 220-400 μm, and the particle diameter of silica fine powder is 0.05-0.1 μm.
3. a kind of silicon carbide brick according to claim 1, it is characterized in that, in the raw material composition of composite mineralizer, the weight part of each component is: 65 parts of granites, 35 parts of fluorites, 15 parts of potassium felspar sands, 30 parts of diatom oozes, 25 parts of medical stones, 5 parts of boron nitride, 8 parts of glass microballons and 15 parts of nano zine oxides.
4. a kind of silicon carbide brick according to claim 1 or 3, is characterized in that, described composite mineralizer is prepared by following steps: 1) granite, fluorite, potassium felspar sand and medical stone pulverized 100-300 mesh sieve respectively and removed impurity; 2) granite of step 1), fluorite, potassium felspar sand and medical stone are fired to 1150 DEG C respectively in 20 hours and are cooled to 25 DEG C; 3) step 2 is taken by formula) granite, fluorite, potassium felspar sand after process, add diatom ooze and boron nitride, adopt wet ball grinding fine grinding process to wear into slurry, then cross 400-500 mesh sieve; 4) slurry of step 3) is carried out drying, drying temperature 220-280 DEG C, spray glass microballon and nano zine oxide after being dried to moisture content≤3-5%, while sprinkling and ultrasonic vibration, ultrasonic power is 100-120kw.
5. a kind of silicon carbide brick according to claim 1, is characterized in that, described bonding agent is Seaweed Extract, and the preparation method of this bonding agent is as follows: 1) clean: the tap water that marine alga raw material is 45-50 DEG C soaks 2-3 hour, then cleans up;
2) pulverize, centrifugal: the marine alga cleaned up, vacuum breaking, add the ethanol of marine alga volume 30 times and fourth diester solution soaking and boil, the volume ratio of ethanol and fourth diester is 1:1, then centrifugation is removed slag to obtain marine alga clear liquid, the rotating speed of whizzer is 4000 ~ 6000rpm, and centrifugation time is 15-20min;
3) nanofiltration: diluted by the pure water of marine alga clear liquid with 5-10 times of volume, then carries out dialysis by nanofiltration membrane and concentrates, and the 0.1-0.2 that the dialysis of marine alga clear liquid is concentrated into dilution front volume doubly obtains nanofiltration concentrated solution, and the molecular weight cut-off of described nanofiltration membrane is 600-700Da;
4) concentrate drying: the further vacuum concentration of nanofiltration concentrated solution to solid content is 40-60%, then in spray-dryer, spraying dry obtains the Powdered Seaweed Extract of water content 2-3%.
6. the preparation method of a silicon carbide brick as claimed in claim 1, it is characterized in that, described preparation method is: each raw material weighs by above proportioning, through mixing, shaping, make adobe with mold pressing vibrating forming machine, adobe toasts 20-25 hour at 550-650 DEG C, then impregnating autoclave is put in the adobe after baking and vacuumize process, vacuum pressure is 0.05-0.08mpa, pressurize 40-50 minute, then soaker is added, continue pressurize 3-5 hour, the adobe after dipping 1200-1285 DEG C of roasting, soaking time 75-85 hour.
7. the preparation method of a kind of silicon carbide brick according to claim 6, is characterized in that, soaker is the refinery coke of molten state, and the add-on of soaker is that liquid level exceeds adobe upper surface 500-700mm.
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