CN107235722A - A kind of magnesium chromium firebrick and preparation method thereof - Google Patents
A kind of magnesium chromium firebrick and preparation method thereof Download PDFInfo
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- CN107235722A CN107235722A CN201710525285.4A CN201710525285A CN107235722A CN 107235722 A CN107235722 A CN 107235722A CN 201710525285 A CN201710525285 A CN 201710525285A CN 107235722 A CN107235722 A CN 107235722A
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Abstract
The present invention relates to technical field of refractory materials.A kind of magnesium chromium firebrick, includes the component of following parts by weight：30 ~ 38 parts of magnesia chrome spinel, 20 ~ 25 parts of highly-purity magnesite, 6 ~ 10 parts of chromite sinters 5 ~ 10 parts of Magnesia-chrome synthetic materials, Cr2O33 ~ 5 parts of superfine powder, 2 ~ 5 parts of bonding agent, Fe2O315 ~ 25 parts of powder, Al2O38 ~ 16 parts of powder, 0.5 ~ 1 part of CaO powder, SiO20.5 ~ 2 part of powder, 1 ~ 2 part of TiO2 powder, 1 ~ 6 part of hafnium metal powfer.The present invention provides a kind of preparation method of magnesium chromium firebrick in addition：Raw material is mixed, is mixed in batch mixer, obtains compound；Compound is put into mould, it is compressing, obtain green compact；Compressing green compact are heated in stove and obtain finished product.The beneficial effects of the present invention are：The present invention is simply easy to implement with the preparation method that excellent thermal shock resistance and slag corrosion resistance ability and the present invention are provided.
Description
Technical field
The present invention relates to technical field of refractory materials, in particular to a kind of magnesium chromium firebrick and preparation method thereof.
Background technology
Magnesite-chrome brick is using magnesia and chrome green as main component, and periclase and spinelle are the resistance to of main mineral constituent
Fiery material product.
Current production equipment gradually to maximization direction develop, therefore now how to increase in process of production yield,
Improve quality, reduce cost turn into can increase the key factor of productivity effect.Due to by chemistry during the use of equipment
Corrode and permeate, and the influence such as periodic temperature change drastically, brick body is easily deformed.Now if blowing out maintenance is carried out
Substantial amounts of economic loss can be caused, it is therefore desirable to extend the service life of brick body, and brick body is improved under its working environment
Service life, reduces cost, it is necessary to which brick body has excellent thermal shock resistance and resistance to slag corrosion.
And the performance of current magnesite-chrome brick is unsatisfactory, Direct bond magnesia-chrome brick is used, though it is stable with excellent thermal shock
Property, but resistance to slag corrosion is not strong；Electric smelting recombined magnesia-chrome brick, its anti-scour property is strong, but thermal shock resistance is bad.
Therefore need at present a kind of with excellent thermal shock resistance and the magnesite-chrome brick of resistance to slag corrosion.
The content of the invention
In order to solve the above problems there is provided a kind of with excellent thermal shock resistance and resistance to slag corrosion and with relatively low
The magnesium chromium firebrick of thermal conductivity, the present invention is adopted the following technical scheme that：
A kind of magnesium chromium firebrick, includes the component of following parts by weight：
30 ~ 38 parts of magnesia chrome spinel, 20 ~ 25 parts of highly-purity magnesite, 6 ~ 10 parts of chromite sinters 5 ~ 10 parts of Magnesia-chrome synthetic materials, Cr2O3
3 ~ 5 parts of superfine powder, 2 ~ 5 parts of bonding agent, Fe2O315 ~ 25 parts of powder, Al2O38 ~ 16 parts of powder, 0.5 ~ 1 part of CaO powder, SiO2Powder
Last 0.5 ~ 2 part, 1 ~ 2 part of TiO2 powder, 1 ~ 6 part of hafnium metal powfer.
Employ magnesia chrome spinel, highly-purity magnesite, chromite, sintering Magnesia-chrome synthetic materials, Cr in the present invention first2O3It is super
Fine powder, Al2O3The scheme that powder is used in conjunction with, wherein increasing the content of magnesium in brick body with magnesia, can improve the fire resisting of product
Ability, with 5 ~ 10 parts of Magnesia-chrome synthetic materials of sintering and Cr2O3Content of 3 ~ 5 parts of the superfine powder to adjust the chrome green in product, makes
The content for obtaining each component in raw material is easily controllable, increases the stability of product quality, increases qualification rate, reduces cost.And take
The scheme that above-mentioned raw materials are used in conjunction with, in sintering process, the Cr in MgO and chromite in magnesia203Composition is in sintering process
Middle phase counterdiffusion, point-like secondary spinel is internally formed in periclase;Material of the present invention is formed in various degree in cooling procedure
Secondary composite spinelle and the secondary spinel of periclase one be combined equal, form between each phase directly in conjunction with chromium phase quilt
The structure of magnesia parcel.Wherein the present invention is synthesized under higher temperature conditionss, under the high temperature conditions, has spinelle hair
Raw precipitation situation occurs, and is conducive to the generation of secondary magnesia chrome spinel, is also beneficial to the structure that be combined with each other of each phase in brick body
Formed.So that product has more preferable compactness, while the generation of the good secondary magnesia chrome spinel of more resistance to slag is favourable
In the lifting of the slag corrosion resistance ability of product.The di-iron trioxide in product can be contributed to chrome green with solid solution simultaneously
The sintering temperature of chromium component is reduced, promotes chromium component preferably sinter molding, is favorably improved the slag corrosion resistance ability of product.Separately
Alundum (Al2O3) and magnesia in outer raw material can also form soluble solids, and its structure is sufficiently stable, is favorably improved product
Thermal shock resistance and slag corrosion resistance ability.And it can improve the heat resistance of product.
Add chromium powder in the material in the present invention in addition, due in sintering, in the case of low oxygen partial pressure, Cr2O3
Can be decomposed generation chromium steam and oxygen gas, and Cr2O3Mass transfer belong to evaporation-condensation mechanism, because evaporation-cohesion is passed
The essence of matter is the filling of neck area, simply changes the shape of stomata, stomata is not excluded, is densified, therefore it
Do not influenceed for bulk density and the porosity.Liquid level Cr2O3Sintering densification is controlled by bulk diffusion, therefore volume expands
Dissipate and collectively constituted by trivalent chromic ion and oxonium ion diffusion, but trivalent chromic ion volume is larger, is not easy to form chromium ion room,
Therefore based on bulk diffusion spread with oxonium ion, therefore, under low oxygen partial pressure, Cr2O3It can be reduced and discharge oxygen, so that
Cr2O3Substantial amounts of oxygen ion vacancy is produced in crystal so that the diffusion of oxonium ion is more prone to carry out, and accelerates Cr2O3Sintering,
Product is densified in a short time, in above process, add chromium metal effect be chromium can with oxygen from
Son reacts generation chrome green, now because the porosity of product is low, therefore contributes to Cr2O3Decomposable process carry out,
And the generation of Cr VI is prevented, so as to accelerate repeating for this process, simultaneously because newly-generated chrome green is lived
Property it is higher, it is easier in the phase for entering magnesia so that the increase of the structure entropy of magnesia, so as to produce more spinelles, enter
And cause the epitaxial growth and adhesion on crystal so that the situation of interconnection is formed between crystal to strengthen the steady of product
It is qualitative, strengthen the thermal shock resistance and compressive resistance and slag corrosion resistance ability of product.
And the less such effect of amount for the chromium metal that the present invention is used is to prevent the too high levels of chromium metal, chromium content
It is too high to cause product that thermal expansion occurs in heating, cause the porosity of product to become big, cause product thermal shock resistance and
Compressive resistance and slag corrosion resistance ability decline, and less chromium powder can reduce the thermal conductivity of product to a certain extent in addition.
Preferably, described bonding agent uses sodium carboxymethyl starch.
Sodium carboxymethyl starch is outstanding bonding agent first, can meet needed for production, be favorably improved the intensity of product
And resistance to slag, it is secondly cheap using sodium carboxymethyl starch, production cost can be reduced.
Preferably, described sodium carboxymethyl starch is prepared using following methods：
A. the ethanol solution of the chloroacetic acid of 20 ~ 30 parts by weight and 70 ~ 80 parts by weight is prepared by mixing into chloroacetic acid-ethanol molten
Liquid, the sodium hydroxide of 9 ~ 10 parts by weight is dissolved in 90 ~ 91 parts of water, sodium hydroxide solution is obtained；
B. the potato starchy residue of 5 ~ 6 parts by weight is put into container and then added 95% ethanol of 7 ~ 8 parts by weight, to mixing
Thing is stirred, and mixing time is 5 ~ 10min；
C. the sodium hydroxide solution of 2 ~ 3 parts by weight will be added in the mixture after above-mentioned stirring, is reacted under the conditions of 30 ~ 40 DEG C
5 ~ 10 minutes；
D. solution into step c adds chloroacetic acid-ethanol solution of 1.5 ~ 2 parts by weight, is heated to 65 ~ 70 DEG C, and reaction 20 ~
25min；
E. the sodium hydroxide solution of 4 ~ 6 parts by weight is added in the solution obtained to step d, keeping temperature reacts 18 ~ 23min；
F. chloroacetic acid-ethanol solution of 1.5 ~ 2 parts by weight, keeping temperature, reaction 35 are added in the mixture obtained to step e
~40min；
G. the obtained mixtures of step f are cooled to less than 35 DEG C, with vinegar acid for adjusting pH be 7 ~ 8 between, filtering, washed with ethanol
Wash, dry, obtain sodium carboxymethyl starch.
Sodium carboxymethyl starch is prepared using the above method, material first is potato starchy residue, be the recovery profit of discarded object
With serving the effect economized on resources with environmental protection while reducing cost.It is necessary to have more general in the present invention in addition
Sodium carboxymethyl starch has the sodium carboxymethyl starch of stronger viscosity and high substituted degree, therefore present invention employs above-mentioned steps preparation
Sodium carboxymethyl starch, by secondary response so that reaction is more thorough, and can improve the substitution value of sodium carboxymethyl starch, carboxylic
Methyl starch sodium can be filled in the space between crystal cohesive effect of playing when heat treatment, be easy to knot between crystal
The formation of structure, so as to improve the thermal shock resistance and resistance to slag corrosion of product.
Preferably, described Fe2O3Powder is nanometer Fe2O3Powder.
Present invention employs nanometer Fe2O3Powder, can strengthen nanometer Fe2O3The dispersiveness of powder in the material, Ke Yijia
Strong Fe2O3- MgO generation is so as to strengthen the generation of secondary spinel, so that the corrosion resistance of product is improved, while of the invention
Titania powder is also used, titania powder can strengthen the dispersiveness of di-iron trioxide, while improving the anti-of product
Thermal shock resistance and heat-resisting ability, while adding nanometer Fe2O3Powder can strengthen the viscosity to slag, therefore can strengthen product
Slag corrosion resistance ability.
Preferably, described nanometer Fe2O3Powder is handled using following methods：By nanometer Fe2O3It is put into water, carries out
Ultrasonically treated 5 ~ 10min, adds calgon, proceeds ultrasonically treated 5 ~ 10min, then filters, precipitation toluene
Washing 3 ~ 4 times, is dried, the nanometer Fe after being handled2O3。
The present invention is by by nanometer Fe2O3Powder progress is ultrasonically treated, because nanometer Fe2O3Powder has what is easily reunited
Problem, if the Fe that directly use can reunite2O3Powder dispersion effect is not good, causes Fe2O3Combined with MgO not exclusively, from
And the thermal shock resistance and compressive resistance and slag corrosion resistance ability of product are reduced, in order to prevent the generation of this process, this hair
It is bright to carry out above-mentioned processing to it, first can be by the energy that has in ultrasonic wave by the nanometer Fe of reunion2O3Powder is broken up,
Calgon is added, calgon is attached to nanometer Fe2O3On powder surface, to nanometer Fe2O3Powder plays surface modification
Effect, so as to prevent nanometer Fe2O3The generation of the reunion of powder.So that nanometer Fe2O3Powder can be sufficiently mixed in production
Played a role in product.
Preferably, described highly-purity magnesite includes following granularity：10 ~ 12 parts of 1 ~ 3mm highly-purity magnesite, 0.09 ~ 1mm's
6 ~ 8 parts of highly-purity magnesite, highly-purity magnesite 3 ~ 5 part of the granularity in below 0.09mm.
A kind of preparation method of magnesium chromium firebrick, comprises the following steps：
（1）Batch mixing：Raw material is mixed, 40 ~ 50min is mixed in batch mixer, compound is obtained；
（2）Compacting：Compound is put into mould, it is compressing under 30Mpa pressure, obtain green compact；
（3）Heat treatment：Compressing green compact are heated in stove and obtain finished product.
Preferably, in step（3）Described heat treatment process is that green compact are first preheated into 18 ~ 24h at 100 ~ 150 DEG C
Afterwards, 2000 ~ 2200 DEG C of 4 ~ 5h of insulation are warming up to.
It is heat-treated present invention employs hot environment, it is therefore intended that increase the generation of secondary spinel to strengthen this
The slag corrosion resistance ability and thermal shock resistance of invention.
Preferably, in step（3）Described in heat treatment process carry out under nitrogen protection.
In sintering, in the case of low oxygen partial pressure, Cr2O3Can be decomposed generation chromium steam and oxygen gas, and
Cr2O3Mass transfer belong to evaporation-condensation mechanism, because the essence of evaporation-cohesion mass transfer is the filling of neck area, simply change
The shape of stomata, stomata is not excluded, is densified, therefore it does not influence for bulk density and the porosity.Liquid
Position Cr2O3Sintering densification is controlled by bulk diffusion, therefore bulk diffusion spreads common group by trivalent chromic ion and oxonium ion
Into, but trivalent chromic ion volume is larger, is not easy to be formed chromium ion room, therefore based on bulk diffusion spread with oxonium ion, therefore,
Under low oxygen partial pressure, Cr2O3It can be reduced and discharge oxygen, so that in Cr2O3Substantial amounts of oxygen ion vacancy is produced in crystal, is made
The diffusion for obtaining oxonium ion is more prone to carry out, and accelerates Cr2O3Sintering so that product can be densified in a short time, be improved
The slag corrosion resistance ability and thermal shock resistance of product, while also improving the compressive resistance and flexural capacity of product.And if oxygen contains
Amount height can then react generation Cr VI, without occurring above-mentioned ion diffusion phenomena, while Cr VI has pollution to environment.Cause
This contributes to reduce partial pressure of oxygen using nitrogen atmosphere, so as to improve the compactness of product, and then improves the slag corrosion resistance energy of product
Power and thermal shock resistance, while also improving the compressive resistance and flexural capacity of product.
The beneficial effects of the present invention are：（1）The present invention has excellent thermal shock resistance and slag corrosion resistance ability（2）This hair
The preparation method of bright offer is simply easy to implement.
Embodiment
The present invention is further explained with reference to specific implementation case：
Embodiment 1
A kind of magnesium chromium firebrick, includes the component of following parts by weight：
30 ~ 38 parts of magnesia chrome spinel, 10 parts of 1mm highly-purity magnesite, 6 parts of 0.09 ~ 1mm highly-purity magnesite, granularity 0.09mm with
Under 3 parts of highly-purity magnesite, 6 parts of chromite, sinter 5 parts of Magnesia-chrome synthetic materials, Cr2O33 parts of superfine powder, 2 parts of sodium carboxymethyl starch, receives
Rice Fe2O3 15 parts of powder, Al2O38 parts of powder, 0.5 part of CaO powder, SiO20.5 part of powder, 1 part of TiO2 powder, 1 part of hafnium metal powfer.
Wherein, described sodium carboxymethyl starch is prepared using following methods：
A. the ethanol solution of the chloroacetic acid of 20 parts by weight and 70 parts by weight is prepared by mixing into chloroacetic acid-ethanol solution, will
The sodium hydroxide of 10 parts by weight is dissolved in 90 parts of water, obtains sodium hydroxide solution；
B. the potato starchy residue of 5 parts by weight is put into container and then added 95% ethanol of 7 parts by weight, mixture is entered
Row stirring, mixing time is 5min；
C. the sodium hydroxide solution of 2 parts by weight will be added in the mixture after above-mentioned stirring, 5 points are reacted under the conditions of 30 DEG C
Clock；
D. the solution into step c adds chloroacetic acid-ethanol solution of 1.5 parts by weight, is heated to 65 DEG C, reacts 20min；
E. the sodium hydroxide solution of 4 parts by weight is added in the solution obtained to step d, keeping temperature reacts 18min；
F. chloroacetic acid-ethanol solution of 1.5 parts by weight, keeping temperature, reaction are added in the mixture obtained to step e
35min；
G. the obtained mixtures of step f are cooled to less than 35 DEG C, are 7 with vinegar acid for adjusting pH, filtering is washed with ethanol, is dried,
Obtain sodium carboxymethyl starch.
Wherein described nanometer Fe2O3 Powder is handled using following methods：By nanometer Fe2O3It is put into water, carries out at ultrasound
5min is managed, calgon is added, proceeds ultrasonically treated 5min, then filter, precipitation is washed 3 times with toluene, is dried,
Nanometer Fe after being handled2O3。
A kind of preparation method of magnesium chromium firebrick, comprises the following steps：
（1）Batch mixing：Raw material is mixed, 40min is mixed in batch mixer, compound is obtained；
（2）Compacting：Compound is put into mould, it is compressing under 30Mpa pressure, obtain green compact；
（3）Heat treatment：By compressing green compact in stove, first green compact are preheated after 18h at 100 DEG C, 1800 DEG C are warming up to
5h is incubated, and described heat treatment process is carried out under nitrogen protection.
Embodiment 2
A kind of magnesium chromium firebrick, includes the component of following parts by weight：
30 ~ 38 parts of magnesia chrome spinel, 10 parts of 1mm highly-purity magnesite, 6 parts of 0.09 ~ 1mm highly-purity magnesite, granularity 0.09mm with
Under 3 parts of highly-purity magnesite, 6 parts of chromite, sinter 5 parts of Magnesia-chrome synthetic materials, Cr2O33 parts of superfine powder, 2 parts of sodium carboxymethyl starch, receives
Rice Fe2O3 15 parts of powder, Al2O38 parts of powder, 0.5 part of CaO powder, SiO20.5 part of powder, 1 part of TiO2 powder, 1 part of hafnium metal powfer.
Wherein, described sodium carboxymethyl starch is prepared using following methods：
A. the ethanol solution of the chloroacetic acid of 20 parts by weight and 70 parts by weight is prepared by mixing into chloroacetic acid-ethanol solution, will
The sodium hydroxide of 10 parts by weight is dissolved in 90 parts of water, obtains sodium hydroxide solution；
B. the potato starchy residue of 5 parts by weight is put into container and then added 95% ethanol of 7 parts by weight, mixture is entered
Row stirring, mixing time is 5min；
C. the sodium hydroxide solution of 2 parts by weight will be added in the mixture after above-mentioned stirring, 5 points are reacted under the conditions of 30 DEG C
Clock；
D. the solution into step c adds chloroacetic acid-ethanol solution of 1.5 parts by weight, is heated to 65 DEG C, reacts 20min；
E. the sodium hydroxide solution of 4 parts by weight is added in the solution obtained to step d, keeping temperature reacts 18min；
F. chloroacetic acid-ethanol solution of 1.5 parts by weight, keeping temperature, reaction are added in the mixture obtained to step e
35min；
G. the obtained mixtures of step f are cooled to less than 35 DEG C, are 7 with vinegar acid for adjusting pH, filtering is washed with ethanol, is dried,
Obtain sodium carboxymethyl starch.
Wherein described nanometer Fe2O3 Powder is handled using following methods：By nanometer Fe2O3It is put into water, carries out at ultrasound
5min is managed, calgon is added, proceeds ultrasonically treated 5min, then filter, precipitation is washed 3 times with toluene, is dried,
Nanometer Fe after being handled2O3。
A kind of preparation method of magnesium chromium firebrick, comprises the following steps：
（1）Batch mixing：Raw material is mixed, 40min is mixed in batch mixer, compound is obtained；
（2）Compacting：Compound is put into mould, it is compressing under 30Mpa pressure, obtain green compact；
（3）Heat treatment：By compressing green compact in stove, first green compact are preheated after 18h at 100 DEG C, 1800 DEG C are warming up to
5h is incubated, and described heat treatment process is carried out under nitrogen protection.
Embodiment 3
A kind of magnesium chromium firebrick, includes the component of following parts by weight：
38 parts of magnesia chrome spinel, 12 parts of 1 ~ 3mm highly-purity magnesite, 8 parts of 0.09 ~ 1mm highly-purity magnesite, granularity is in below 0.09mm
5 parts of highly-purity magnesite, 10 parts of chromite, sinter 10 parts of Magnesia-chrome synthetic materials, Cr2O35 parts of superfine powder, 5 parts of sodium carboxymethyl starch, receives
Rice Fe2O3 25 parts of powder, Al2O316 parts of powder, 1 part of CaO powder, SiO22 parts of powder, 2 parts of TiO2 powder, 6 parts of hafnium metal powfer.
Wherein, described sodium carboxymethyl starch is prepared using following methods：
A. the ethanol solution of the chloroacetic acid of 20 parts by weight and 70 parts by weight is prepared by mixing into chloroacetic acid-ethanol solution, will
The sodium hydroxide of 10 parts by weight is dissolved in 90 parts of water, obtains sodium hydroxide solution；
B. the potato starchy residue of 5 parts by weight is put into container and then added 95% ethanol of 7 parts by weight, mixture is entered
Row stirring, mixing time is 5min；
C. the sodium hydroxide solution of 2 parts by weight will be added in the mixture after above-mentioned stirring, 5 points are reacted under the conditions of 30 DEG C
Clock；
D. the solution into step c adds chloroacetic acid-ethanol solution of 1.5 parts by weight, is heated to 65 DEG C, reacts 20min；
E. the sodium hydroxide solution of 4 parts by weight is added in the solution obtained to step d, keeping temperature reacts 18min；
F. chloroacetic acid-ethanol solution of 1.5 parts by weight, keeping temperature, reaction are added in the mixture obtained to step e
35min；
G. the obtained mixtures of step f are cooled to less than 35 DEG C, are 7 with vinegar acid for adjusting pH, filtering is washed with ethanol, is dried,
Obtain sodium carboxymethyl starch.
Wherein described nanometer Fe2O3 Powder is handled using following methods：By nanometer Fe2O3It is put into water, carries out at ultrasound
5min is managed, calgon is added, proceeds ultrasonically treated 5min, then filter, precipitation is washed 3 times with toluene, is dried,
Nanometer Fe after being handled2O3。
A kind of preparation method of magnesium chromium firebrick, comprises the following steps：
（1）Batch mixing：Raw material is mixed, 40min is mixed in batch mixer, compound is obtained；
（2）Compacting：Compound is put into mould, it is compressing under 30Mpa pressure, obtain green compact；
（3）Heat treatment：By compressing green compact in stove, first green compact are preheated after 18h at 100 DEG C, 1800 DEG C are warming up to
5h is incubated, and described heat treatment process is carried out under nitrogen protection.
Then detection apparent porosity 7%, cold crushing strength 41MPa, in Taber mills are carried out to the preferred embodiment of the present invention 2
Rotated 1000 times using emery wheel on consumption testing machine and obtain abrasion loss as 46.4g, heating permanent line change（1450℃×2h）/ % is
0.26。
For the detection of thermal shock resistance, the present invention surveys the material of preferred embodiment 3 by 1450 degrees Celsius of processing in 3 hours
Then its rupture strength, rupture strength is incubated after 20min chilling in 20 degrees Celsius of cold water again for 18.3MPa at 1100 degrees Celsius,
It is repeated 10 times, rupture strength is 10.4MPa.
In summary, the present invention has thermal shock resistance strong, the characteristics of resistance performance of slag corrosion is strong.
Claims (9)
1. a kind of magnesium chromium firebrick, it is characterised in that include the component of following parts by weight：
30 ~ 38 parts of magnesia chrome spinel, 20 ~ 25 parts of highly-purity magnesite, 6 ~ 10 parts of chromite sinters 5 ~ 10 parts of Magnesia-chrome synthetic materials, Cr2O3
3 ~ 5 parts of superfine powder, 2 ~ 5 parts of bonding agent, Fe2O315 ~ 25 parts of powder, Al2O38 ~ 16 parts of powder, 0.5 ~ 1 part of CaO powder, SiO2Powder
Last 0.5 ~ 2 part, 1 ~ 2 part of TiO2 powder, 1 ~ 6 part of hafnium metal powfer.
2. a kind of magnesium chromium firebrick according to claim 1, it is characterised in that：Described bonding agent uses CMS
Sodium.
3. a kind of magnesium chromium firebrick according to claim 1 or 2, it is characterised in that：Described sodium carboxymethyl starch is used
It is prepared by following methods：
A. the ethanol solution of the chloroacetic acid of 20 ~ 30 parts by weight and 70 ~ 80 parts by weight is prepared by mixing into chloroacetic acid-ethanol molten
Liquid, the sodium hydroxide of 9 ~ 10 parts by weight is dissolved in 90 ~ 91 parts of water, sodium hydroxide solution is obtained；
B. the potato starchy residue of 5 ~ 6 parts by weight is put into container and then added 95% ethanol of 7 ~ 8 parts by weight, to mixing
Thing is stirred, and mixing time is 5 ~ 10min；
C. the sodium hydroxide solution of 2 ~ 3 parts by weight will be added in the mixture after above-mentioned stirring, is reacted under the conditions of 30 ~ 40 DEG C
5 ~ 10 minutes；
D. solution into step c adds chloroacetic acid-ethanol solution of 1.5 ~ 2 parts by weight, is heated to 65 ~ 70 DEG C, and reaction 20 ~
25min；
E. the sodium hydroxide solution of 4 ~ 6 parts by weight is added in the solution obtained to step d, keeping temperature reacts 18 ~ 23min；
F. chloroacetic acid-ethanol solution of 1.5 ~ 2 parts by weight, keeping temperature, reaction 35 are added in the mixture obtained to step e
~40min；
G. the obtained mixtures of step f are cooled to less than 35 DEG C, with vinegar acid for adjusting pH be 7 ~ 8 between, filtering, washed with ethanol
Wash, dry, obtain sodium carboxymethyl starch.
4. a kind of magnesium chromium firebrick according to claim 1, it is characterised in that：Described Fe2O3Powder is nanometer Fe2O3
Powder.
5. a kind of magnesium chromium firebrick according to claim 4, it is characterised in that：Described nanometer Fe2O3 Powder use with
Lower method processing：By nanometer Fe2O3It is put into water, carries out ultrasonically treated 5 ~ 10min, add calgon, proceed to surpass
5 ~ 10min of sonication, is then filtered, and precipitation is washed 3 ~ 4 times with toluene, is dried, the nanometer Fe after being handled2O3。
6. a kind of magnesium chromium firebrick according to claim 1, it is characterised in that described highly-purity magnesite includes following grain
Degree：10 ~ 12 parts of 1 ~ 3mm highly-purity magnesite, 6 ~ 8 parts of 0.09 ~ 1mm highly-purity magnesite, highly-purity magnesite 3 of the granularity in below 0.09mm
~ 5 parts.
7. the preparation method of a kind of magnesium chromium firebrick according to claim 1, it is characterised in that comprise the following steps：
（1）Batch mixing：Raw material is mixed, 40 ~ 50min is mixed in batch mixer, compound is obtained；
（2）Compacting：Compound is put into mould, it is compressing under 30Mpa pressure, obtain green compact；
（3）Heat treatment：Compressing green compact are heated in stove and obtain finished product.
8. a kind of preparation method of magnesium chromium firebrick according to claim 7, it is characterised in that：In step（3）Described
Heat treatment process is warming up to 1600 ~ 1800 DEG C of 4 ~ 5h of insulation first to preheat green compact after 18 ~ 24h at 100 ~ 150 DEG C.
9. a kind of preparation method of magnesium chromium firebrick according to claim 7, it is characterised in that：In step（3）Described in
Heat treatment process carry out under nitrogen protection.
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| CN108191412A (en) * | 2018-03-23 | 2018-06-22 | 湖州知维技术服务有限公司 | A kind of refractory brick |
| CN108484139A (en) * | 2018-06-29 | 2018-09-04 | 中钢集团洛阳耐火材料研究院有限公司 | A kind of preparation method of magchrome refractory |
| CN109592970A (en) * | 2018-12-20 | 2019-04-09 | 瑞泰科技股份有限公司 | A kind of low chromium electric smelting recombined magnesia-chrome brick |
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| CN110668845A (en) * | 2019-09-27 | 2020-01-10 | 合肥汉甲陶瓷科技有限公司 | Glazing method for reducing glaze shrinkage defects generated on ceramic surface |
| CN110668845B (en) * | 2019-09-27 | 2020-11-20 | 界首市伟盛古窑彩陶制作发展有限公司 | Glazing method for reducing glaze shrinkage defects generated on ceramic surface |
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| CN115340363A (en) * | 2022-07-25 | 2022-11-15 | 中冶武汉冶金建筑研究院有限公司 | Direct-bonded magnesia-chrome brick for cement rotary kiln and preparation method thereof |
| CN116253575A (en) * | 2023-03-21 | 2023-06-13 | 东北大学 | Magnesium-chromium sand magnesium-based ceramic core and preparation method thereof |
| CN116253575B (en) * | 2023-03-21 | 2024-05-07 | 东北大学 | Magnesium-chromium sand magnesium-based ceramic core and preparation method thereof |
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