CN109761597A - A kind of Bo Naite composite brick and preparation method thereof - Google Patents
A kind of Bo Naite composite brick and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of Bo Naite composite brick and preparation method thereof, preparation steps are as follows: phosphoric acid solution, aluminium hydroxide micro powder, oxalic acid powder and water is first sufficiently mixed reaction uniformly, obtained solution I；Solution I is added after Bo Naite particle is mixed again; it continuess to mix uniformly; then Bo Naite fine powder, alumina powder and additive is added, cold conditions molding or vibration moulding after being sufficiently mixed uniformly, obtained Bo Naite composite brick after well-dried and 1500~1600 DEG C of high temperature firings.Bo Naite composite brick obtained by the present invention has excellent alkali resistant erosion performance, while with low thermal conductivity and high intensity the high-purity material similar with density compared with, and stability is good and pollution-free, long service life.
Description
Technical field
The invention belongs to technical field of refractory materials more particularly to a kind of Bo Naite composite brick and preparation method thereof.
Technical background
The development of cement kiln, always for the purpose of increasing economic efficiency, reduce energy consumption, improve product quality.It is large-scale
The advantages that new dry process rotary kiln is highly efficient and productive with its, energy-saving and environmental protection is quickly grown, and occupation rate of market is up to 95% or more, newly
Type dry method kiln becomes domestic large-scale or medium-sized concrete plant and mainly selects.
However, due in cement kiln alkali content it is higher be easy to cause in cement rotary kiln in working lining refractory product peel off and
Cracking.Wherein in clinkering zone, decomposition band etc. alkali with RCl and R2SO4Form volatilization, and agglomerated in 800 DEG C or so of kiln section
And enrichment, the damage of refractory material is caused by corrosion refractory material and into refractory material internal-response crystallization generation stress.
At the same time, relative to more serious in wet process new type dry kiln.When using the higher coal ash of chlorinty as fuel, returning
The circulation enrichment of alkali is more significant in rotary kiln, through exacerbating containing the ingredients such as alkali sulfate and chloride volatilization cohesion iterative cycles
The peeling and damage of refractory product.Traditional magnesian-chrome efractoy due to being easy by alkaline matter in kiln during operation
It is generated after erosion and contains Cr6+The compound of hypertoxicity, and will cause serious environmental pollution after discharge.
It therefore, is the service life for improving refractory material in new type nonaqueous cement rotary kiln, energy conservation and environmental protection.New dry process water
Stall proposes new requirement to refractory material in kiln: having good thermal shock resistance, alkali resistant erosiveness is strong, room temperature mechanical property
It can be with thermal structure intensity height and environment friendly etc..Technical staff promotes capabilities of refractory materials in new type dry kiln kiln at present
It is conducted in-depth research and technological development with the problems such as improvement.
" magnesite-chrome brick CN200710189924.0 " disclose it is a kind of by synthesize magnoferrite, synthesis magnesium chromohercynite,
A kind of magnesite-chrome brick for dry-process cement rotary kiln that magnesia, fine chrome mine etc. are prepared.But its major defect be (1) cost of material compared with
It is high；(2) preparation process is excessively complicated；(3) it is be easy to cause environmental pollution containing chromium compound, endangers environmental health.A kind of " cement
Kiln height temperate zone utilizes highly-purity magnesite, magnesium aluminate spinel, iron aluminium point with magnalium zirconia block and preparation method thereof CN201110169241.5 "
Spar is primary raw material, prepares a kind of cement kiln magnesium-iron-aluminum composite spinel brick without chromium, has highly heatproof and shockproof
The advantages that ability, high temperature toughness, industry is simple, at low cost.But the alkaline-resisting chemical attack energy of its main problem (1) product deposited
Power is poor；(2) mechanical behavior under high temperature is lower；(3) the problems such as thermal coefficient is high, and energy consumption is high.
Summary of the invention
The present invention is directed to overcome prior art defect, provide a kind of with thermal coefficient is low, intensity is high, erosion-resisting characteristics is excellent
The Bo Naite composite brick and preparation method thereof for the features such as good and service life is long.
To achieve the above object, the technical scheme adopted by the invention is as follows:
A kind of Bo Naite composite brick, preparation method includes the following steps:
Step 1: being 60-75% phosphoric acid solution by the concentration mass percent of 23~48 parts of quality, the hydrogen of 10~26 deals
The water of alumina powder, the oxalic acid powder of 0.7~1.8 part of quality and 31~61 parts of quality is sufficiently mixed uniformly, until reaction completely,
It is prepared into solution I.
Step 2: the Bo Naite particle of 46~72 parts of quality is mixed, it is to be mixed uniformly after add 0.5~1 part
The solution I of quality continuess to mix, and the Bo Naite fine powders of 22~38 parts of quality, 5~20 parts of quality are added after being sufficiently mixed uniformly
Alumina powder adds the additive of 0.2~0.8 part of quality and the solution I of 2~4 parts of quality, is sufficiently mixed uniformly.
Step 3: step 2 institute is mixed uniformly to materials progress cold conditions molding or vibration moulding, after well-dried
It is burnt under 1500 DEG C~1600 DEG C hot conditions, can be prepared by Bo Naite composite brick.
Al (OH) in the aluminium hydroxide micro powder3Content >=98wt%；Average grain diameter≤0.045mm.
Coolant-temperature gage in the step 1 is 70~90 DEG C.
CaAl in the Bo Naite particle12O19Content >=98wt%；The grain composition of Bo Naite particle is: partial size be 5~
The particle of 3mm accounts for Bo Naite 5~12wt% of particle, partial size is less than 3mm and the particle more than or equal to 1mm account for Bo Naite particle 40~
60wt%, partial size is less than 1mm and the particle more than or equal to 0.1mm accounts for 32~53wt% of Bo Naite particle.
CaAl in the Bo Naite fine powder12O19Content >=98wt%；Average grain diameter≤0.045mm.
Al in the alumina powder2O3Content >=98wt%；Average grain diameter is 2 μm.
The additive is one or more of carboxymethyl cellulose, yellow starch gum or biphosphate aluminium powder.
Due to the adoption of the above technical scheme.Compared with the prior art, the invention has the following beneficial effects:
The present invention is molded as primary raw material by cold conditions using Bo Naite material, aluminium oxide or vibration moulding prepares Bo Naite and answers
Close brick.Its thermal coefficient is low, improves the heat-proof quality of cement kiln, reduces energy loss.At the same time, Bo Naite material is introduced
Material, due to its own crystal structure and property, is remarkably improved the ability resistant to chemical etching of refractory brick, high volume stability
With thermal shock resistance.Secondly as thermal expansion coefficient is approximate, therefore aluminium oxide is introduced, improves the ambient temperature mechanical properties of refractory brick.
The present invention has the characteristics that thermal coefficient is low, intensity is high, erosion-resisting characteristics is excellent and long service life.
Specific embodiment
The invention will be further described With reference to embodiment, not to the limitation of its protection scope.
It is first that raw material Unify legislation involved by present embodiment is as follows to avoid repeating, in embodiment not
It repeats again:
Al (OH) in the aluminium hydroxide micro powder3Content >=98wt%；Average grain diameter≤0.045mm.
Coolant-temperature gage in the step 1 is 70~90 DEG C.
CaAl in the Bo Naite particle12O19Content >=98wt%；The grain composition of Bo Naite particle is: grade be 5~
The particle of 3mm accounts for Bo Naite 5~12wt% of particle, partial size is less than 3mm and the particle more than or equal to 1mm account for Bo Naite particle 40~
60wt%, partial size is less than 1mm and the particle more than or equal to 0.1mm accounts for 32~53wt% of Bo Naite particle.
CaAl in the Bo Naite fine powder12O19Content >=98wt%；Average grain diameter≤0.045mm.
Al in the alumina powder2O3Content >=98wt%；Average grain diameter is 2 μm.
Embodiment 1
A kind of preparation method of Bo Naite composite brick.The step of preparation method of the Bo Naite composite brick, is:
Step 1: being 60-75% phosphoric acid solution, 10~17 parts of quality by the concentration mass percent of 23~32 parts of quality
The water of aluminium hydroxide micro powder, the oxalic acid powder of 1.5~1.8 parts of quality and 52~61 parts of quality is sufficiently mixed uniformly, until completely anti-
It answers, is prepared into solution I, for use.
Step 2: the Bo Naite particle of 46~54 parts of quality is mixed, uniformly rear additional 0.5~1 part of matter to be mixed
The solution I of amount continuess to mix, and the Bo Naite fine powder of 33~38 parts of quality, the oxygen of 12~18 parts of quality are added after being sufficiently mixed uniformly
Change aluminium micro mist, then additional 0.2~0.8 part of quality additive and 2~4 parts of quality solution I, be sufficiently mixed uniformly, for use.
Step 3: step 2 institute is mixed uniformly to materials progress cold conditions molding or vibration moulding, after well-dried
It is burnt under 1500 DEG C~1550 DEG C hot conditions, can be prepared by Bo Naite composite brick.
Bo Naite composite brick obtained by the present invention through under 1500 DEG C~1550 DEG C hot conditions be burnt into after flexural strength be
11~13MPa, compressive resistance are 110~121MPa, and ambient temperature mechanical properties maintain heavy refractory lining and bulk density is then low
In generic heavy material, reach 2.7~2.8gcm-3, thermal conductivity and burn after Linear change rate be superior to conventional heavy and lightweight
Inner lining material, thermal coefficient are 1.6~1.7W/ (mK)；1100 DEG C × 3h carries out alkali erosion experiment, and nothing is obviously permeated and invaded
Erosion, erosion-resisting characteristics are excellent.
Embodiment 2
A kind of preparation method of Bo Naite composite brick.The step of preparation method of the Bo Naite composite brick, is:
Step 1: being 60-75% phosphoric acid solution, 15~21 parts of quality by the concentration mass percent of 32~41 parts of quality
The water of aluminium hydroxide micro powder, the oxalic acid powder of 1.1~1.5 parts of quality and 41~52 parts of quality is sufficiently mixed uniformly, until completely anti-
It answers, is prepared into solution I, for use.
Step 2: the Bo Naite particle of 54~63 parts of quality is mixed, uniformly rear additional 0.5~1 part of matter to be mixed
The solution I of amount continuess to mix, and the Bo Naite fine powder of 28~33 parts of quality, the oxygen of 8~15 parts of quality are added after being sufficiently mixed uniformly
Change aluminium micro mist, then additional 0.2~0.8 part of quality additive and 2~4 parts of quality solution I, be sufficiently mixed uniformly, for use.
Step 3: step 2 institute is mixed uniformly to materials progress cold conditions molding or vibration moulding, after well-dried
It is burnt under 1550 DEG C~1600 DEG C hot conditions, can be prepared by Bo Naite composite brick.
Bo Naite composite brick obtained by the present invention through under 1550 DEG C~1600 DEG C hot conditions be burnt into after flexural strength be
14~15MPa, compressive resistance are 121~130MPa, and ambient temperature mechanical properties maintain heavy refractory lining and bulk density is then low
In generic heavy material, reach 2.8~2.9gcm-3, thermal conductivity and burn after Linear change rate be superior to conventional heavy and lightweight
Inner lining material, thermal coefficient are 1.7~1.8W/ (mK)；1100 DEG C × 3h carries out alkali erosion experiment, and nothing is obviously permeated and invaded
Erosion, erosion-resisting characteristics are excellent.
Embodiment 3
A kind of preparation method of Bo Naite composite brick.The step of preparation method of the Bo Naite composite brick, is:
Step 1: being 60-75% phosphoric acid solution, 19~26 parts of quality by the concentration mass percent of 39~48 parts of quality
The water of aluminium hydroxide micro powder, the oxalic acid powder of 0.7~1.1 part of quality and 31~41 parts of quality is sufficiently mixed uniformly, until completely anti-
It answers, is prepared into solution I, for use.
Step 2: the Bo Naite particle of 63~72 parts of quality is mixed, uniformly rear additional 0.5~1 part of matter to be mixed
The solution I of amount continuess to mix, and the Bo Naite fine powder of 22~28 parts of quality, the oxygen of 5~10 parts of quality are added after being sufficiently mixed uniformly
Change aluminium micro mist, then additional 0.2~0.8 part of quality additive and 2~4 parts of quality solution I, be sufficiently mixed uniformly, for use.
Step 3: step 2 institute is mixed uniformly to materials progress cold conditions molding or vibration moulding, after well-dried
It is burnt under 1500 DEG C~1550 DEG C hot conditions, can be prepared by Bo Naite composite brick.
Bo Naite composite brick obtained by the present invention through under 1500 DEG C~1550 DEG C hot conditions be burnt into after flexural strength be
11~13MPa, compressive resistance are 105~114MPa, and ambient temperature mechanical properties maintain heavy refractory lining and bulk density is then low
In generic heavy material, reach 2.6~2.7gcm-3, thermal conductivity and burn after Linear change rate be superior to conventional heavy and lightweight
Inner lining material, thermal coefficient are 1.5~1.6W/ (mK)；1100 DEG C × 3h carries out alkali erosion experiment, and nothing is obviously permeated and invaded
Erosion, erosion-resisting characteristics are excellent.
Embodiment 4
A kind of preparation method of Bo Naite composite brick.The step of preparation method of the Bo Naite composite brick, is:
Step 1: being 60-75% phosphoric acid solution, 10~17 parts of quality by the concentration mass percent of 23~32 parts of quality
The water of aluminium hydroxide micro powder, the oxalic acid powder of 1.1~1.5 parts of quality and 52~61 parts of quality is sufficiently mixed uniformly, until completely anti-
It answers, is prepared into solution I, for use.
Step 2: the Bo Naite particle of 54~63 parts of quality is mixed, uniformly rear additional 0.5~1 part of matter to be mixed
The solution I of amount continuess to mix, and the Bo Naite fine powder of 28~33 parts of quality, the oxygen of 8~15 parts of quality are added after being sufficiently mixed uniformly
Change aluminium micro mist, then additional 0.2~0.8 part of quality additive and 2~4 parts of quality solution I, be sufficiently mixed uniformly, for use.
Step 3: step 2 institute is mixed uniformly to materials progress cold conditions molding or vibration moulding, after well-dried
It is burnt under 1500 DEG C~1550 DEG C hot conditions, can be prepared by Bo Naite composite brick.
Bo Naite composite brick obtained by the present invention through under 1500 DEG C~1550 DEG C hot conditions be burnt into after flexural strength be
12~13MPa, compressive resistance are 107~116MPa, and ambient temperature mechanical properties maintain heavy refractory lining and bulk density is then low
In generic heavy material, reach 2.7~2.8gcm-3, thermal conductivity and burn after Linear change rate be superior to conventional heavy and lightweight
Inner lining material, thermal coefficient are 1.6~1.7W/ (mK)；1100 DEG C × 3h carries out alkali erosion experiment, and nothing is obviously permeated and invaded
Erosion, erosion-resisting characteristics are excellent.
Embodiment 5
A kind of preparation method of Bo Naite composite brick.The step of preparation method of the Bo Naite composite brick, is:
Step 1: being 60-75% phosphoric acid solution, 15~21 parts of quality by the concentration mass percent of 32~41 parts of quality
The water of aluminium hydroxide micro powder, the oxalic acid powder of 0.7~1.8 part of quality and 41~52 parts of quality is sufficiently mixed uniformly, until completely anti-
It answers, is prepared into solution I, for use.
Step 2: the Bo Naite particle of 63~72 parts of quality is mixed, uniformly rear additional 0.5~1 part of matter to be mixed
The solution I of amount continuess to mix, and the Bo Naite fine powder of 22~28 parts of quality, the oxygen of 5~10 parts of quality are added after being sufficiently mixed uniformly
Change aluminium micro mist, then additional 0.2~0.8 part of quality additive and 2~4 parts of quality solution I, be sufficiently mixed uniformly, for use.
Step 3: step 2 institute is mixed uniformly to materials progress cold conditions molding or vibration moulding, after well-dried
It is burnt under 1550 DEG C~1600 DEG C hot conditions, can be prepared by Bo Naite composite brick.
Bo Naite composite brick obtained by the present invention through under 1550 DEG C~1600 DEG C hot conditions be burnt into after flexural strength be
12~14MPa, compressive resistance are 109~118MPa, and ambient temperature mechanical properties maintain heavy refractory lining and bulk density is then low
In generic heavy material, reach 2.7~2.8gcm-3, thermal conductivity and burn after Linear change rate be superior to conventional heavy and lightweight
Inner lining material, thermal coefficient are 1.6~1.7W/ (mK)；1100 DEG C × 3h carries out alkali erosion experiment, and nothing is obviously permeated and invaded
Erosion, erosion-resisting characteristics are excellent.
Embodiment 6
A kind of preparation method of Bo Naite composite brick.The step of preparation method of the Bo Naite composite brick, is:
Step 1: being 60-75% phosphoric acid solution, 19~26 parts of quality by the concentration mass percent of 39~48 parts of quality
The water of aluminium hydroxide micro powder, the oxalic acid powder of 0.7~1.1 part of quality and 31~41 parts of quality is sufficiently mixed uniformly, until completely anti-
It answers, is prepared into solution I, for use.
Step 2: the Bo Naite particle of 46~54 parts of quality is mixed, uniformly rear additional 0.5~1 part of matter to be mixed
The solution I of amount continuess to mix, and the Bo Naite fine powder of 33~38 parts of quality, the oxygen of 12~18 parts of quality are added after being sufficiently mixed uniformly
Change aluminium micro mist, then additional 0.2~0.8 part of quality additive and 2~4 parts of quality solution I, be sufficiently mixed uniformly, for use.
Step 3: step 2 institute is mixed uniformly to materials progress cold conditions molding or vibration moulding, after well-dried
It is burnt under 1550 DEG C~1600 DEG C hot conditions, can be prepared by Bo Naite composite brick.
The flexural strength after being burnt under 1550 DEG C~1600 DEG C hot conditions of Bo Naite composite brick obtained by the present embodiment 6
For 13~14MPa, compressive resistance is 110~119MPa, ambient temperature mechanical properties maintain heavy refractory lining and bulk density then
Lower than generic heavy material, reach 2.7~2.9gcm-3, thermal conductivity and Linear change rate is superior to conventional heavy and light after burning
Matter inner lining material, thermal coefficient are 1.7~1.8W/ (mK)；1100 DEG C × 3h carries out alkali erosion experiment, and nothing is obviously permeated and invaded
Erosion, erosion-resisting characteristics are excellent.
Bo Naite composite brick obtained by the present invention through under 1500 DEG C~1600 DEG C hot conditions be burnt into after flexural strength be
11~15MPa, compressive resistance are 105~130MPa, and ambient temperature mechanical properties maintain heavy refractory lining and bulk density then reaches
To the level of high-strength light castable, reach 2.6~2.9gcm-3, Linear change rate is superior to conventional heavy after thermal conductivity and burning
And light inner lining material, thermal coefficient are 1.5-1.8W/ (mK)；1100 DEG C × 3h carries out alkali erosion experiment, without obvious infiltration
And erosion, erosion-resisting characteristics are excellent.
Therefore, the features such as thermal coefficient of the present invention is low, intensity is high, erosion-resisting characteristics is excellent and long service life.
The above is only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form, any ripe
Professional and technical personnel is known, without departing from the scope of the present invention, according to the technical essence of the invention, to the above reality
Any simple modifications, equivalent substitutions and improvements etc. made by example are applied, it is fallen within the scope of protection of the technical scheme of the present invention
It is interior.
Claims (8)
1. a kind of preparation method of Bo Naite composite brick, it is characterised in that: the preparation method of Bo Naite composite brick includes following step
It is rapid:
Step 1: being the hydrogen-oxygen of 60-75% phosphoric acid solution, 10~26 parts of quality by the concentration mass percent of 23~48 parts of quality
The water for changing aluminium micro mist, the oxalic acid powder of 0.7~1.8 part of quality and 31~61 parts of quality is sufficiently mixed uniformly, until reaction completely, makes
Obtain solution I；
Step 2: the Bo Naite particle of 46~72 parts of quality is mixed, uniformly rear 0.5~1 part of quality of addition to be mixed
Solution I continuess to mix, and the Bo Naite fine powder of 22~38 parts of quality, the aluminium oxide of 5~20 parts of quality are added after being sufficiently mixed uniformly
Then micro mist adds the additive of 0.2~0.8 part of quality and the solution I of 2~4 parts of quality, be sufficiently mixed uniformly；
Step 3: carry out cold conditions molding or vibration moulding to materials for step 2 institute is mixed uniformly, it is well-dried after in
It is burnt under 1500 DEG C~1600 DEG C hot conditions, can be prepared by Bo Naite composite brick.
2. the preparation method of Bo Naite composite brick according to claim 1, it is characterised in that: in the aluminium hydroxide micro powder
Al(OH)3Content >=98wt%；Average grain diameter≤0.045mm.
3. the preparation method of Bo Naite composite brick according to claim 1, it is characterised in that: the water temperature in the step 1
Degree is 70~90 DEG C.
4. the preparation method of Bo Naite composite brick according to claim 1, it is characterised in that: in the Bo Naite particle
CaAl12O19Content >=98wt%；The grain composition of Bo Naite particle is: partial size be 5~3mm particle account for Bo Naite particle 5~
12wt%, partial size is less than 3mm and the particle more than or equal to 1mm accounts for 40~60wt% of Bo Naite particle, and partial size is less than 1mm and big
32~53wt% of Bo Naite particle is accounted in the particle equal to 0.1mm.
5. the preparation method of Bo Naite composite brick according to claim 1, it is characterised in that: in the Bo Naite fine powder
CaAl12O19Content >=98wt%；Average grain diameter≤0.045mm.
6. the preparation method of Bo Naite composite brick according to claim 1, it is characterised in that: in the alumina powder
Al2O3Content >=98wt%；Average grain diameter is 2 μm.
7. the preparation method of Bo Naite composite brick according to claim 1, it is characterised in that: the additive is carboxymethyl
One or more of cellulose, yellow starch gum or biphosphate aluminium powder.
8. a kind of Bo Naite composite brick, it is characterised in that: the Bo Naite composite brick be according to claim 1~7 in it is any
Bo Naite composite brick prepared by the preparation method of the item Bo Naite composite brick.
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Application publication date: 20190517 |
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| RJ01 | Rejection of invention patent application after publication |