CN103553658B - Impermeable brick for aluminum reduction cell and preparation method thereof - Google Patents
Impermeable brick for aluminum reduction cell and preparation method thereof Download PDFInfo
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- CN103553658B CN103553658B CN201310481267.2A CN201310481267A CN103553658B CN 103553658 B CN103553658 B CN 103553658B CN 201310481267 A CN201310481267 A CN 201310481267A CN 103553658 B CN103553658 B CN 103553658B
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- brick
- impermeabilisation
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Abstract
The invention discloses an impermeable brick for an aluminum reduction cell and a preparation method thereof. The preparation method comprises the following steps: mixing raw materials of the impermeable brick, carrying out mould pressing, drying and calcining. The raw materials of the impermeable brick contain: by weight, 77-87 parts of pyrophillite, 10-15 parts of high-alumina bauxite, 2-5 parts of clay, 0-1 part of a burn promoter and 1-2 parts of spent pulping liquor, wherein grain size distribution of pyrophillite is 3-1mm32-50wt%, 1-0mm23-35wt% and -0.088mm15-33wt%; average grain diameter of high-alumina bauxite is less than or equal to 10 microns; and average grain diameter of clay is less than or equal to 2 microns. The preparation method is simple. The prepared impermeable brick has high strength, low apparent porosity, excellent cryolite erosion resistance, and can meet the requirement of long life of an aluminum reduction cell.
Description
Technical field
The present invention relates to fire resisting material field, be specifically related to a kind of preparation method of the impermeabilisation brick for aluminium cell.
Background technology
At present in Aluminium Industry production process, aluminium cell is widely used, and aluminium cell is generally by graphite or silicon carbide working lining, and aluminosilicate property barrier layer and thermal insulation layer three-decker are formed.
In electrolytic aluminum process, the thermal equilibrium maintained in aluminium cell is particularly important, when temperature is more than 700 DEG C, because Na, NaF can enter barrier layer from the pore of the gap of working lining or material, form the mineral such as sodium nepheline with the refractory materials chemical combination of barrier layer and produce volumetric expansion, structure of refractory is caused to be destroyed, additive cryolite melts in Na, NaF and electrolytic solution also can penetrate into thermal insulation layer further, deposit in thermal insulation layer, thus the thermal resistance of thermal insulation layer is reduced, finally cause the thermal equilibrium of aluminium cell destroyed and can not use.
Therefore, the barrier layer in aluminium cell need use the material that anti-permeability performance is good, existing theoretical study results surface, Al in seepage resistant material
2o
3and SiO
2weight ratio in 0.36 ~ 0.39 scope time, reasonable cryolite resistant and accessibility can be obtained.
Generally dry type impervious material is adopted in aluminum electrolysis industry domestic at present, certain anti-seepage effect can be played, but because the impact being subject to site operation is larger, the density of construction directly will affect barrier performance, quality is difficult to ensure, meanwhile, there is the drawbacks such as construction dust is large, external main employing impermeabilisation brick, its typical product is Alubar1100.
Domestic Ye You producer attempts producing impermeabilisation brick, be mainly that raw material is produced with clayey, gas product porosity is 17 ~ 22%, compressive strength 30 ~ 50MPa, and in use, there is contraction in material, easily produces brickwork joint and cause waste residue and aluminium liquid to infiltrate from brickwork joint, have a certain distance with external product, result of use is poor.
Application publication number be CN1903783A patent document discloses a kind of high effect leakage proof brick of aluminium electrolysis bath and preparation method thereof, using silicon-aluminium matter refractory mineral as raw material, calcined dehydration is pulverized, and adds solid additive and is dry mixed, and then adds that liquid binder is wet grinds mixing; The mixture obtained is carried out to the detection of component concentration, after conformance with standard, with vibrations pressing machine vibrating forming or extrusion machine extrusion molding, oven dry, prepare required high effect leakage proof brick of aluminium electrolysis bath, this leakage proof brick is made up of following component: SiO
240 ~ 70 parts, Al
2o
330 ~ 60 parts, Fe
2o
33 ~ 7 parts, solid additive 1 ~ 5 part, liquid binder 3 ~ 15 parts.The properties of the impermeabilisation brick of this disclosure of the invention all needs to be improved further.
Summary of the invention
The invention provides a kind of impermeabilisation brick for aluminium cell and preparation method thereof, preparation method is simple, and the impermeabilisation brick intensity prepared is high, and apparent porosity is low, has excellent resistance to cryolite performance, can meet the long-life demand of aluminium cell.
For a preparation method for the impermeabilisation brick of aluminium cell, comprise the following steps: after each raw material mixing of impermeabilisation brick, mold pressing drying and calcining forms;
The weight part of described impermeabilisation brick Raw consists of:
Agalmatolite 77 ~ 87;
Alumine 10 ~ 15;
Clay 2 ~ 5;
The agent 0 ~ 1 of short burning;
Spent pulping liquor 1 ~ 2;
Wherein, the grain size distribution of described agalmatolite is:
3～1mm32～50wt%；
1～0mm23～35wt%；
-0.088mm15～33wt%；
Median size≤10 μm of described alumine;
Median size≤2 μm of described clay.
For impermeabilisation brick, the most basic requirement is fine and close and intensity is high, therefore, in raw material, the size distribution of each component is particularly important, the gap between various raw material can be made minimum by rational grain size distribution, reach maximum tap density, after sintering completes, the brick body that anti-permeability performance is good can be obtained.
Percentage ratio in grain size distribution described in the application refers to weight percentage, such as: 3 ~ 1mm32wt% refers to: if the gross weight of the agalmatolite in impermeabilisation brick raw material is 100kg, then the agalmatolite of 3 ~ 1mm granularity is 32kg.
-0.088mm can also be expressed as-180 orders in the technical field of the invention, refers to: median size≤0.088mm, can by carrying out ball milling to oarse-grained agalmatolite, makes particle size reduction to≤0.088mm.
When preparing impermeabilisation brick, after each component being mixed in proportion, adopt wheel roller mud refining 5 ~ 8min, then compression molding under the pressure of 80 ~ 100Mpa, the base substrate after shaping is under 100 ~ 120 DEG C of conditions, and dry 12 ~ 24h, then calcining forms.
The impermeabilisation brick that the application provides is mainly with inexpensive agalmatolite, similarity is had with the refractory brick technique in prior art with agalmatolite being main material production, compression molding pressure and drying conditions can with reference to processing parameters of the prior art, but due to different from prior art of raw material composition, calcination condition is different, preferably, calcining temperature is 1100 ~ 1300 DEG C, and calcination time is 5 ~ 10h.
Further preferably, calcining temperature is 1180 ~ 1220 DEG C, and calcination time is 6 ~ 8h.
The cryolite resistant of impermeabilisation brick and accessibility depend on wherein SiO to a great extent
2and Al
2o
3weight ratio, therefore, for the SiO in each raw material
2and Al
2o
3all there is requirement, according to the feature of raw material self, preferably, Al in described agalmatolite
2o
3weight percentage be 17 ~ 25%, SiO
2weight percentage be 75 ~ 83%, R
2weight percentage≤1% of O, wherein: R is Na and/or K.
R
2o≤1%, if refer to, R is Na, then Na
2weight percentage≤1% of O; If R is K, then K
2weight percentage≤1% of O; If R is Na or K, then Na
2o and K
2o is at total weight percentage≤1%.
Al in described alumine
2o
3weight percentage>=80%.Al in described clay
2o
3weight percentage be>=20%, SiO
2weight percentage be>=40%.
In actual production process, in the agalmatolite of Different sources, SiO
2and Al
2o
3weight percentage different, but SiO in same mineral ore
2and Al
2o
3weight percentage comparatively homogeneous, therefore, as the SiO in a certain place of production
2and Al
2o
3weight percentage when can not meet the demands, the agalmatolite rawore of Different sources can be mixed, make SiO
2and Al
2o
3weight percentage satisfy the demands.
In actual production process, the needs adapting to different brick regulate clay, short add-on and granular size of burning agent, reach best molding effect and coking property.
Described alumine can utilize the dust suction powder between high aluminium material crushing vehicle, and the molecule after the pulverizing of namely reclaiming realizes the recycling of resource.
Described clay can adopt ball clay, and the stickiness of ball clay and fire performance better, are convenient to the carrying out of compression molding.
In order to make impermeabilisation brick have more excellent anti-permeability performance, preferably, the weight part of described impermeabilisation brick Raw consists of:
Agalmatolite 80 ~ 84;
Alumine 12 ~ 14;
Clay 2 ~ 5;
The agent 0 ~ 1 of short burning;
Spent pulping liquor 1 ~ 2.
As preferably, described short burning agent is at least one in borax, boron glass, boric acid.
Present invention also offers a kind of impermeabilisation brick for aluminium cell, the preparation method of the impermeabilisation brick described in employing prepares, the pyrophyllite matter compact high-strength type impermeabilisation brick obtained, according to industry international standard, check through external authoritative institution SINTEF, finished material volume density reaches 2.25 ~ 2.32g/cm
3; Void content 11.5 ~ 14.5%, cold crushing strength is at more than 55MPa, and under 1100 DEG C of water-cooled conditions, the thermal shock stable degree of material can reach more than 10 times, 950 DEG C × 24h cryolite resistant index≤3cm
2.
Embodiment
Embodiment 1 ~ 5
In all embodiments, the particle diameter of agalmatolite A is 3 ~ 1mm; The particle diameter of agalmatolite B is 1 ~ 0mm; The particle diameter of agalmatolite C is-0.088mm; Different letter is only for distinguishing the difference of size.
In all embodiments, Al in agalmatolite A, agalmatolite B and agalmatolite C
2o
3weight percentage be 18%, SiO
2weight percentage be 80%, R
2o≤1%, wherein: R is Na and/or K.
In all embodiments, Al in alumine
2o
3weight percentage be 82%, SiO
2weight percentage be 12%.
In all embodiments, Al in clay
2o
3weight percentage be 30%, SiO
2weight percentage be 48%.
The Al of each component in raw material
2o
3and SiO
2weight percentage is the mean value measured and obtain, and during actually operating, different raw materials can be utilized to carry out mixture, make Al
2o
3and SiO
2weight percentage meets the requirement of the present invention for raw material.
That the performance for infiltration brick plays a decisive role is the Al finally obtained after each component mixes
2o
3and SiO
2weight percentage, therefore, also can carry out converting according to the component in embodiment and corresponding weight part obtains the addition of respective components, such as, Al in alumine in embodiment 1
2o
3weight percentage be 82%, weight part is 13, if Al in existing alumine
2o
3weight percentage be 80% can to use, then weight part is scaled 13.3.
Spent pulping liquor, the i.e. aqueous solution of lignosulfonic acid calcium powder, the proportion of spent pulping liquor is 1.14g/cm
3.
The preparation process of embodiment 1 ~ 5 is as follows:
By each component of parts by weight of raw materials composition mixing in table 1, then adopt wheel roller pugging 5 ~ 8min, the base substrate after compression molding, 110 DEG C of dryings, then forms at 1210 DEG C of temperature lower calcinations, and the impermeabilisation brick of preparation is of a size of 230mm × 114mm × 65mm.
Table 1
Embodiment 6 ~ 10
The preparation process of embodiment 6 ~ 10 is as follows:
By each component of parts by weight of raw materials composition mixing in table 2, then adopt wheel roller pugging 5 ~ 8min, the base substrate after compression molding, 110 DEG C of dryings, then forms at 1200 DEG C of temperature lower calcinations, and the impermeabilisation brick obtained is of a size of 300mm × 300mm × 65mm.
Table 2
Comparative example 1 ~ 2
Employing application publication number is that the method for embodiment 1 and embodiment 2 in the patent documentation of CN1903783A prepares comparative example 1 and comparative example 2 respectively.
Performance test
For all embodiments and comparative example, thermal shock stable degree measures under 1100 DEG C of water-cooled conditions, and cryolite resistant index measures under 950 DEG C × 24h condition.
The performance test results of embodiment 1 ~ 6 is as shown in table 3.
Table 3
The performance test results of embodiment 7 ~ 10 and comparative example 1 ~ 2 is as shown in table 4.
Table 4
As can be seen from table 3 and table 4, the thermal shock stable degree of the impermeabilisation brick for aluminium cell that the application provides is all more than 10 times, and cryolite resistant index≤3cm
2.
Claims (5)
1. for a preparation method for the impermeabilisation brick of aluminium cell, it is characterized in that, comprise the following steps: after each raw material mixing of impermeabilisation brick, mold pressing drying and calcining forms;
The weight part of described impermeabilisation brick Raw consists of:
Agalmatolite 80 ~ 84;
Alumine 12 ~ 14;
Clay 2 ~ 5;
The agent 0 ~ 1 of short burning, but do not comprise 0;
Spent pulping liquor 1 ~ 2;
Wherein, the grain size distribution of described agalmatolite is:
3~1mm 32~50wt%；
1~0mm 23~35wt%；
-0.088mm 15~33wt%；
Median size≤10 μm of described alumine;
Median size≤2 μm of described clay;
Described short burning agent is at least one in borax, boron glass, boric acid;
Al in described alumine
2o
3weight percentage>=80%.
2., as claimed in claim 1 for the preparation method of the impermeabilisation brick of aluminium cell, it is characterized in that, Al in described agalmatolite
2o
3weight percentage be 17 ~ 25%, SiO
2weight percentage be 75 ~ 83%, R
2weight percentage≤1% of O, wherein: R is Na and/or K.
3., as claimed in claim 1 for the preparation method of the impermeabilisation brick of aluminium cell, it is characterized in that, Al in described clay
2o
3weight percentage be>=20%, SiO
2weight percentage be>=40%.
4., as claimed in claim 3 for the preparation method of the impermeabilisation brick of aluminium cell, it is characterized in that, calcining temperature is 1100 ~ 1300 DEG C, and calcination time is 5 ~ 10h.
5., for an impermeabilisation brick for aluminium cell, it is characterized in that, adopt as arbitrary in claim 1 ~ 4 as described in the preparation method of impermeabilisation brick prepare.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310481267.2A CN103553658B (en) | 2013-10-15 | 2013-10-15 | Impermeable brick for aluminum reduction cell and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310481267.2A CN103553658B (en) | 2013-10-15 | 2013-10-15 | Impermeable brick for aluminum reduction cell and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103553658A CN103553658A (en) | 2014-02-05 |
| CN103553658B true CN103553658B (en) | 2015-07-08 |
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|---|---|---|---|
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030699A (en) * | 2014-05-26 | 2014-09-10 | 浙江立鑫高温耐火材料有限公司 | Aluminum-blocking brick |
| CN104059246B (en) * | 2014-06-27 | 2016-04-27 | 成都新柯力化工科技有限公司 | Inorganic light diffusing agent of a kind of printing opacity and preparation method thereof |
| CN105130390A (en) * | 2015-08-27 | 2015-12-09 | 郑州安耐克实业有限公司 | Low-temperature sintered refractory slurry and preparation method therefor |
| CN106882970B (en) * | 2017-02-22 | 2020-07-07 | 济源市涟源炉业有限公司 | Composite anti-seepage brick for electrolytic cell |
| CN109834271A (en) * | 2019-02-25 | 2019-06-04 | 俞小峰 | A kind of preparation method of aluminum electrolytic tank long-acting special impermeabilisation brick |
| CN110342945A (en) * | 2019-07-12 | 2019-10-18 | 新疆天山建材集团耐火材料有限责任公司 | A kind of dry type impervious material and preparation method thereof |
| CN111892413B (en) * | 2020-08-26 | 2023-02-14 | 郑州中科耐火材料有限公司 | Special impermeable brick for aluminum electrolytic cell lining and preparation method thereof |
| CN112521170A (en) * | 2020-12-24 | 2021-03-19 | 湖北第二师范学院 | Preparation method of refractory high-abrasion-resistance brick with clean surface |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1180679A (en) * | 1996-10-24 | 1998-05-06 | 周季楠 | Antierosion fireproof material for aluminium electrolyzer |
| CN1475456A (en) * | 2003-07-07 | 2004-02-18 | 安徽华运陶瓷有限公司 | High strength impervious inner wall brick |
| CN103288465A (en) * | 2013-06-19 | 2013-09-11 | 宜兴新威利成耐火材料有限公司 | Pyrophyllite brick and preparation method thereof |
-
2013
- 2013-10-15 CN CN201310481267.2A patent/CN103553658B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1180679A (en) * | 1996-10-24 | 1998-05-06 | 周季楠 | Antierosion fireproof material for aluminium electrolyzer |
| CN1475456A (en) * | 2003-07-07 | 2004-02-18 | 安徽华运陶瓷有限公司 | High strength impervious inner wall brick |
| CN103288465A (en) * | 2013-06-19 | 2013-09-11 | 宜兴新威利成耐火材料有限公司 | Pyrophyllite brick and preparation method thereof |
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|---|---|
| CN103553658A (en) | 2014-02-05 |
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Address after: 312300 338 Bai Xie Road, Bai Guan Street, Shangyu City, Shaoxing, Zhejiang Patentee after: Zhejiang independent Cmi Holdings Ltd. Address before: 312300 338 Bai Xie Road, Bai Guan Street, Shangyu City, Shaoxing, Zhejiang Patentee before: ZHEJIANG ZILI Corp.,Ltd. |
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Effective date of registration: 20190428 Address after: 312300 Zhejiang Shaoxing Hangzhou Bay Shangyu economic and Technological Development Zone East two District Ju Xian two Road 9 Patentee after: ZHEJIANG ZILI HIGH TEMPERATURE TECHNOLOGY Co.,Ltd. Address before: 312300 338 Bai Xie Road, Bai Guan Street, Shangyu City, Shaoxing, Zhejiang Patentee before: Zhejiang independent Cmi Holdings Ltd. |
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Address after: 312300 Zhejiang city of Shaoxing province Hangzhou Bay Juxian two East District of Shangyu economic and Technological Development Zone two Road No. 9 Patentee after: Zhejiang Zili High Temperature Technology Co.,Ltd. Address before: 312300 Zhejiang city of Shaoxing province Hangzhou Bay Juxian two East District of Shangyu economic and Technological Development Zone two Road No. 9 Patentee before: ZHEJIANG ZILI HIGH TEMPERATURE TECHNOLOGY Co.,Ltd. |