YB/T 113-2019 Burned microporous alumina graphite brick
2023-12-08
Burned microporous alumina graphite brick
1 Scope
This standard specifies the terms and definitions, grades and shape dimensions, technical requirements, test methods, quality evaluation procedures, packaging, marking, transportation, storage and quality certificates of burned microporous alumina graphite bricks.
This standard is applicable to burned microporous alumina graphite bricks used for lining blast furnaces.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version applies to this document. , Only the dated version applies to this document. For undated references, , its latest version ( including all amendments, ) applies to this document.
GB/T 2997 Test methods for bulk density, apparent porosity and true porosity of dense shaped refractory products
GB/T 3000 Dense shaped refractory products Air permeability test method
GB/T 5072 Refractory materials Test method for compressive strength at room temperature
GB/T 7321 Preparation method for shaped refractory product samples
GB/T 10325 Acceptance sampling inspection rules for shaped refractory products
GB/T 10326 Inspection methods for dimensions, appearance and section of shaped refractory products
GB/T 14983 Refractory materials Alkaline resistance test method
GB/T 16546 Packaging, marking, transportation and storage of shaped refractory products
GB/T 16555 Chemical analysis methods for refractory materials containing carbon, silicon carbide and nitrides
GB/T 22588 Flash method for measuring thermal diffusivity or thermal conductivity
GB/T 24201 Test method for molten iron erosion resistance of blast furnace carbon blocks
YB/T 118 Test method for pore size distribution of refractory materials
YB/T 5012 Shape and size of refractory bricks for blast furnaces and hot blast stoves
YB/T 5291 Test method for thermal conductivity of blast furnace carbon blocks
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Burned microporous alumina graphite brick
Burned alumina carbon with an average pore size of no more than 1μm, and the pore volume of pores smaller than 1μm accounts for no less than 70% of the total open pore volume.
4 Grades and shape dimensions
4.1 Burned microporous alumina graphite bricks are divided into two grades, WLT-1 and WLT-2, according to their physicochemical properties. WLT are the initials of "Wei", "Lv" and "Tan" in Pinyin.
4.2 The shape and size of burned microporous alumina graphite bricks shall conform to the provisions of YB/T 5012.
5 Technical requirements
5.1 The physicochemical indicators of burned microporous alumina graphite bricks shall conform to the provisions of Table 1.
Table 1 Physicochemical indicators of burned microporous alumina graphite bricks | ||||
Item | Index | |||
WLT-1 | WLT-2 | |||
w(Al 2 O 3)/% | ≥ | 65 | 60 | |
w(C)/% | ≥ | 11 | 11 | |
w(TFe)/% | ≤ | 1.5 | 1.5 | |
Compressive strength at room temperature/MPa | ≥ | 70 | 60 | |
Bulk density/(g/cm 3) | ≥ | 2.85 | 2.65 | |
Apparent porosity/% | ≤ | 16 | 17 | |
Molten iron erosion index/% | ≤ | 2 | 3 | |
Thermal conductivity/(W/(m·K)) | Room temperature | ≥ | 16 | 16 |
300℃ | ≥ | 15 | 15 | |
600℃ | ≥ | 14 | 14 | |
800℃ | ≥ | 13 | 13 | |
Alkaline resistance (strength change rate)/% | ≤ | 10 | 10 | |
Air permeability/㎡(mDa) | ≤ | 4.94×10 -10 | 1.97×10 -9 | |
Average pore size/μm | ≤ | 0.5 | 0.7 | |
<1μm pore volume/% | ≥ | 80 | 70 | |
Note 1: Pore size distribution detection range: 0.006μm~360μm. Note 2: The molten iron erosion index is only applicable to the hearth and bottom of the furnace. | ||||
5.2 The dimensional deviations and appearance requirements of the fired microporous aluminum carbon bricks shall conform to the provisions of Table 2. The shape and size can be determined through consultation between the supplier and the demander.
Table 2 Allowable Dimensional Deviations of Fired Microporous Aluminum Carbon Bricks (Unit: mm) | ||||
Item | Index | |||
WLT-1 | WLT-2 | |||
Allowable Dimensional Deviation | Length | ±1.5 | ±2 | |
Width | ±1.5 | ±2 | ||
Thickness | ±1 | ±1 | ||
Warping | Length ≤345 | ≤ | 1 | 1 |
Length >345 | 1 | 1.5 | ||
Crack Length | Width ≤0.25 | Unrestricted | Unrestricted | |
Width 0.26~0.50 | <15 | <15 | ||
Width >0.50 | Not allowed | Not allowed | ||
Missing edges (a+b+c), missing corners length (e+f+g) | ≤ | 25 | 25 | |
Melt hole diameter | 3 | 3 | ||
Note: When using this brick to build the furnace bottom, the allowable dimensional deviation requirements are stricter, and the brick should meet the user's requirements after grinding. | ||||
6 Test Methods
6.1 Sampling shall be carried out according to GB/T 7321.
6.2 Determination of apparent porosity and bulk density shall be carried out according to GB/T 2997.
6.3 Determination of air permeability shall be carried out according to GB/T 3000.
6.4 Determination of normal temperature compressive strength shall be carried out according to GB/T 5072.
6.5Al2 O 3, Determination of TFe and C content shall be carried out according to GB/T 16555.
6.6 Determination of alkali resistance shall be carried out according to GB/T 14983, and the results shall be expressed as the strength change rate.
6.7 Determination of molten iron erosion index shall be carried out according to GB/T 24201.
6.8 Determination of thermal conductivity shall be carried out according to YB/T 5291 or GB/T 22588.
6.9 Determination of 1μm pore volume percentage shall be carried out according to YB/T 118.
6.10 Inspection of dimensions and appearance shall be carried out according to GB/T 10326.
7 Quality Assessment Procedures
7.1 Batching
Each batch shall not exceed 50t.
7.2 Sampling and Acceptance Criteria
Product sampling and acceptance shall be carried out according to GB/T 10325. The acceptance inspection items shall be determined through consultation between the supplier and the demander.
8 Packaging, Marking, Transportation, Storage and Quality Certificate
8.1 Packaging, marking, transportation and storage of products shall be carried out according to GB/T 16546.
8.2 Upon shipment, a quality certificate issued by the quality supervision department shall be attached. The quality certificate shall state the supplier's name or factory mark, the demander's name, the shipping date, the contract number, the standard number, the product name, the grade, the brick number, the batch number, the dimensions, the appearance and the results of physical and chemical tests, etc.
Burned microporous alumina graphite brick
1 Range
This standard specifies the terms and definitions, grades and shapes, technical requirements, test methods, quality assessment procedures, packaging, marking, transportation, storage and quality certificates of fired microporous aluminum carbon bricks.
This standard is applicable to the sintered microporous aluminum-carbon bricks used in the lining of blast furnaces.
2 Normative reference documents
The following documents are essential for the application of this document. For dated references, the date-only version applies to this document. For undated references, the latest version (including all amendment orders) applies to this document.
Test method for bulk density, apparent porosity and true porosity of GB/T 2997 compact shaped refractory products
Test method for air permeability of GB/T 3000 dense shaped refractory products
GB/T 5072 refractories – normal temperature compressive strength test method
GB/T 7321 shaped refractory product sample preparation method
GB/T 10325 shaped refractory products acceptance sampling inspection rules
GB/T 10326 shaped refractory products size, appearance and section inspection method
GB/T 14983 test method for alkali resistance of refractories
GB/T 16546 shaped refractory products packaging, marking, transportation and storage
GB/T 16555 Method for chemical analysis of refractories containing carbon, silicon carbide and nitride
GB/T 22588 flash method to measure thermal diffusivity or thermal conductivity
GB/T 24201 blast furnace carbon block resistance to molten iron corrosion test method
YB/T 118 refractories – Test method for pore size distribution
YB/T 5012 firebricks for blast furnaces and hot blast furnaces
Test method for thermal conductivity of carbon block in YB/T 5291 blast furnace
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Burned microporous alumina graphite brick
The average pore size is not more than 1μm, and the pore volume with a pore size less than 1μm accounts for not less than 70% of the total volume of the opening pore.
4 Grades and shapes
4.1 Fired microporous aluminum carbon bricks are divided into two grades, WLT-1 and WLT-2, according to their physical and chemical indexes. WLT is the abbreviation of "micro," "aluminum," and "carbon" respectively.
4.2 The shape and size of the sintered microporous aluminum carbon bricks must comply with the provisions of YB/T 5012.
5 Technical Requirements 5.1 The physical and chemical indexes of sintered microporous aluminum carbon bricks must conform to the provisions of Table 1.
Table 1. Physical and chemical indexes of sintered microporous aluminum carbon bricks | ||||
Item | Index | |||
WLT-1 | WLT-2 | |||
w(Al 2 O 3)/% | ≥ | 65 | 60 | |
w(C)/% | ≥ | 11 | 11 | |
w(TFe)/% | ≤ | 1.5 | 1.5 | |
Compressive strength at room temperature/MPa | ≥ | 70 | 60 | |
Bulk density/(g/cm 3) | ≥ | 2.85 | 2.65 | |
Apparent porosity/% | ≤ | 16 | 17 | |
Molten iron corrosion index/% | ≤ | 2 | 3 | |
Thermal conductivity/(W/(m·K)) | Room temperature | ≥ | 16 | 16 |
300℃ | ≥ | 15 | 15 | |
600℃ | ≥ | 14 | 14 | |
800℃ | ≥ | 13 | 13 | |
Alkali resistance/% | ≤ | 10 | 10 | |
Air permeability/㎡(mDa) | ≤ | 4.94×10 -10 | 1.97×10 -9 | |
Mean aperture/μm | ≤ | 0.5 | 0.7 | |
<1μm pore volume/% | ≥ | 80 | 70 | |
Note 1: Aperture distribution detection range: 0.006μm~360μm. Note 2: Molten iron corrosion index is only used for hearth and bottom. | ||||
5.2 The size deviation and appearance requirements of the fired microporous aluminum carbon brick must comply with the provisions of Table 2. The shape and size can be determined through negotiation between the supplier and the demander.
Table 2 The unit of allowable deviation of the size of the sintered microporous aluminum carbon brick is mm | ||||
Item | Index | |||
WLT-1 | WLT-2 | |||
Allowable deviation of dimension | Length | ±1.5 | ±2 | |
Breadth | ±1.5 | ±2 | ||
Thickness | ±1 | ±1 | ||
Contort | Length≤345 | ≤ | 1 | 1 |
Length>345 | 1 | 1.5 | ||
Crack length | Breadth≤0.25 | No limit | No limit | |
Breadth 0.26~0.50 | <15 | <15 | ||
Breadth>0.50 | Prohibited | Prohibited | ||
Missing edge (a+b+c), missing Angle length (e+f+g) | ≤ | 25 | 25 | |
Hole diameter | 3 | 3 | ||
Note: When the brick is used to build the furnace bottom, the allowable deviation of the size is strictly required, and the brick should meet the user’s requirements after grinding. | ||||
6 Test methods
6.1 Sample preparation is carried out according to GB/T 7321.
6.2 The apparent porosity and bulk density were measured according to GB/T 2997.
6.3 Breathability was measured according to GB/T 3000.
6.4 The compressive strength at room temperature is measured according to GB/T 5072.
6.5 The content of Al2O3, TFe and C was determined according to GB/T 16555.
6.6 Alkali resistance was measured according to GB/T 14983, and the results were expressed by the intensity change rate.
6.7 The determination of molten iron corrosion index was carried out according to GB/T 24201.
6.8 Thermal conductivity is measured according to YB/T 5291 or GB/T 22588.
6.9 The percentage of pore volume of <1μm was determined according to YB/T 118.
6.10 Size and appearance checks are carried out according to GB/T 10326.
7 Quality assessment procedures
7.1 Batch Encoding
Each batch is not larger than 50t.
7.2 Rules for sampling and conformity determination
Product sampling and acceptance shall be carried out according to GB/T 10325. Acceptance inspection items shall be determined through negotiation between the supplier and the demander.
8 Packaging, marking, transport, storage and quality certificate
8.1 Products are packed, marked, transported and stored according to GB/T 16546.
8.2 A quality certificate issued by the quality supervision department shall be provided. This certificate must include the supplier's name or factory standard, the demander's name, the delivery date, the contract number, the standard number, the product name, the brand number, the brick number, the batch number, the size, the appearance, and the physical and chemical inspection results.
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