JC/T496-2020 Alkali-resistant bricks for cement kiln
2023-12-01
Alkali-resistant bricks for cement kilns
1 Scope
This standard specifies the terminology and definitions, classification and marking, technical requirements, test methods, inspection rules, packaging, marking, transportation, storage and quality certificates of alkali-resistant bricks for cement kilns.
This standard applies to alkali-resistant bricks for cement kilns.
2 Normative references
The following documents are indispensable for the application of this document. If a dated reference is cited, only the dated version applies to this document.
For undated references, the 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 2998 Test methods for bulk density and true porosity of dense insulating refractory products.
GB/T 5988 Test method for permanent linear change of refractory materials after heating.
GBT 5072 Test method for compressive strength of refractory materials at room temperature.
GB/T 6900 Chemical analysis methods for silicoaluminous refractory materials.
GB/T 7321 Preparation methods 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 cross-section of shaped refractory products.
GB/T 16546 Packaging, marking, transportation and storage of shaped refractory products.
GBY18930 Terminology of refractory materials.
GB/T 21114 X-ray fluorescence spectrometry chemical analysis of refractory materials - Molten glass plate method.
GB/T 30873 Test method for thermal shock resistance of refractory materials.
JC/T 808 Test method for burst resistance of silicoaluminous refractory castables.
YB/T 370 Test method for load softening temperature of refractory materials (non-differential-heating method).
YB/T 4130 Test method for thermal conductivity of refractory materials (water flow plate method).
Defined in GB/T 18930 and the following terms and definitions apply to this document.
3 Terms and definitions
3.1
Alkali-resistant bricks for cement kiln
Silicoaluminous refractory products made mainly from low-alumina refractory clay, which have excellent alkali corrosion resistance in cement kiln systems.
4 Classification and marking
4.1 Classification
Products are classified into three grades according to their different properties: ordinary alkali-resistant bricks PNJ, high-strength alkali-resistant bricks GNJ, and heat-insulating alkali-resistant bricks GRNJ.
4.2 Marking
Product marking order: product name, variety and standard number.
Example: High-strength alkali-resistant bricks are marked as: High-strength alkali-resistant bricks GNJ JC/T 496-XXXX.
5 Technical requirements
5.1 The dimensional tolerances and appearance quality of the products shall conform to the provisions of Table 1.
Table 1 Dimensional tolerances and appearance quality of products Unit: mm | ||
Item | Index | |
Dimensional tolerance | <110 | ±1.0 |
≥110，≤200 | ±1.5 | |
>200 | ±2.0 | |
Size difference between the large and small ends of wedge bricks | ±1.0 | |
Twist | ≤0.5% | |
Chipped corner | ≤20, 20 | |
Chipped edge | ≤30, 30 | |
Crack | Width <0.1 | Allowed |
Width ≥0.1，≤0.25 | Crack length ≤ 40 | |
Width >0.25 | Not allowed | |
Note: The dimensional tolerances and appearance quality requirements of special products shall be agreed upon by both the supplier and the demander. | ||
5.2 The physicochemical performance indicators of the products shall conform to the provisions of Tables 2 and 3.
Table 2 Physicochemical performance indicators of ordinary alkali-resistant bricks PNJ and high-strength alkali-resistant bricks GNJ | |||
Item | Index | ||
Ordinary alkali-resistant bricks PNJ | High-strength alkali-resistant bricks GNJ | ||
Physical properties | Apparent porosity/% | ≤20 | ≤18 |
Compressive strength at room temperature/MPa | ≥30 | ≥60 | |
Load softening temperature (0.2MPa, T 0.6 )/℃ | ≥1350 | ≥1300 | |
Thermal shock stability (950℃ air quenching)/times | ≥80 | ≥80 | |
Alkali resistance (1100℃x5h) | Level 1 | ||
Chemical Composition | Al 2 O 3/% | 25~40 | 25~45 |
Fe 2 O 3/% | ≤2.0 | ||
Table 3 Physical Property Index of GRNJ Heat-Insulating Alkali-Resistant Brick | |
Item | Physical Property Index |
Bulk Density/(g/cm³) | ≤1.65 |
Compressive Strength at Room Temperature /MPa | ≥15.0 |
Thermal Conductivity ( Average 350℃)/(W/(m·K)) | ≤0.70 |
Permanent Linear Change After Heating (1250℃x3h)/% | ≤2 |
Alkali Resistance | Level 1 |
6 Test Methods
6.1 The inspection and sampling of alkali-resistant bricks for cement kilns shall be carried out according to the provisions of GB/T 731.
6.2 The permissible deviations in product dimensions and the appearance quality shall be carried out according to the provisions of GB/T 10326.
6.3 The inspection of apparent porosity shall be carried out according to the provisions of GB/T 2997.
6.4 The inspection of compressive strength at room temperature shall be carried out according to the provisions of GB/T 5072.
6.5 The inspection of load softening temperature shall be carried out according to the provisions of YB/T 370.
6.6 The inspection of thermal shock resistance shall be carried out according to the provisions of GB/T 30873.
6.7 The inspection of alkali resistance shall be carried out according to the provisions of JC/T 808.
6.8 Chemical composition shall be carried out according to the provisions of GB/T 6900 and GB/T 21114. In case of arbitration, it shall be carried out according to the provisions of GB/T 6900.
6.9 The inspection of bulk density of heat-insulating alkali-resistant bricks shall be carried out according to the provisions of GB/T 2998.
6.10 The inspection of permanent linear change after heating shall be carried out according to the provisions of GB/T 5988.
6.11 The inspection of thermal conductivity shall be carried out according to the provisions of YB/T 4130.
7 Inspection Rules
7.1 Inspection Classification
Inspection is divided into factory inspection and type inspection.
7.1.1 Factory Inspection
Factory inspection items include dimensional deviation, appearance quality, apparent porosity, compressive strength at room temperature, load softening temperature, bulk density, and chemical composition.
7.1.2 Type Inspection
Type inspection includes all the contents of Chapter 5. Type inspection shall be carried out under any of the following circumstances:
a) When there is a significant change in the production process or raw materials;
b) At least twice a year during normal production;
c) When resuming production after a shutdown of more than six months;
d) When the results of the factory inspection differ significantly from the results of the last type inspection.
7.2 Batching and Sampling
7.2.1 Batching
Products are batched according to the same grade, with each batch being 150t. If less than 150t, it shall be a separate batch.
7.2.2 Sampling
The sampling and acceptance of products shall be carried out according to GB/T 10325.
7.3 Acceptance Criteria
The acceptance of products shall be carried out according to GB/T 10325. Samples for destructive testing shall be taken from samples that have passed the appearance inspection. All items in Chapter 5 are assessment indicators.
8 Packaging, Marking, Transportation, Storage and Quality Certificate
8.1 The packaging, marking, transportation and storage of products shall be carried out according to GB/T 16546.
8.2 When the products are shipped, a quality certificate signed by the supplier's quality department shall be attached. The quality certificate shall state the supplier's name or factory mark, the purchaser's name, the shipping date, the contract number, the product name, the standard number, the grade, the brick number, the batch number and the corresponding physical and chemical test results.
Alkali-resistant bricks for cement kiln
1 Range
This standard specifies the terms and definitions, classification and marking, technical requirements, test methods, inspection rules, packaging, marking, transportation, storage and quality certificates of alkali resistant bricks for cement kilns.
This standard is applicable to alkali resistant bricks for cement kilns.
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 bulk density and true porosity of GB/T 2998 dense heat-insulating refractory products.
GB/T 5988 refractory heating permanent line change test method.
Test method for compressive strength of GBT 5072 refractories at normal temperature.
GB/T 6900 Method for chemical analysis of silica-aluminum refractories.
GB/T 7321 shaped refractory product sample preparation method.
GB/T 10325 Acceptance sampling inspection rules for shaped refractory products.
GB/T 10326 Inspection method for size, appearance and section of shaped refractory products.
GB/T 16546 Packaging, marking, transportation and storage of shaped refractory products.
GBY18930 Refractory terminology.
GB/T 21114 X-ray fluorescence spectrochemical analysis of fused cast glass sheets in refractories.
GB/T 30873 Test method for thermal shock resistance of refractories.
JC/T 808 Test method for break resistance of silica-alumina refractory castables.
YB/T 370 Test method for softening temperature of refractories under load (non-differential – rising temperature method).
YB/T 4130 Refractory thermal conductivity test method “Water flow plate method”.
GB/T 18930 and the following terms and definitions apply to this document.
3 Terms and definitions
3.1
Alkali-resistant bricks for cement kiln
The silica-aluminum series refractory products are made of low-aluminum refractory clay as the main raw material and have excellent alkali attack resistance in cement kiln system.
4 Categorize and label
4.1 Classification
Products are divided into ordinary alkali resistant brick PNJ, high strength alkali resistant brick GNJ, heat insulation alkali resistant brick GRNJ3 grades according to different performance.
4.2 Tags
Product marking sequence: product name, variety and standard number.
Example: The high-strength alkali-resistant brick is labeled as: high-strength alkali-resistant brick GNJJC/T 496-XXXX.
5 Technical Requirements
5.1 The permissible size deviation and appearance quality of the product shall comply with the provisions of Table 1
Table 1 The unit of permissible deviation of product size and appearance quality is mm | ||
Index | Item | |
Allowable deviation of dimension | <110 | ±1.0 |
≥110，≤200 | ±1.5 | |
>200 | ±2.0 | |
Wedge brick size head size difference | ±1.0 | |
Contort | ≤0.5% | |
Missing corner | ≤20 20 | |
Wane | ≤20 20 | |
Crack | Breadth<0.1 | ≤30 30 |
Breadth≥0.1，≤0.25 | Crack length≤40 | |
Breadth>0.25 | Not allow | |
Note: The permissible size deviation and appearance quality requirements of special requirements products shall be agreed by both parties. | ||
5.2 The physical and chemical properties of the product shall comply with the provisions of Table 2 and Table 3.
Table 2 Physical and chemical properties of ordinary alkali resistant brick PNJ and high-strength alkali resistant brick GNJ | |||
Index | Item | ||
Ordinary alkali resistant brick PNJ | High strength alkali resistant brick GNJ | ||
Physical property | Apparent porosity /% | ≤20 | ≤18 |
Compressive strength/MPa | ≥30 | ≥60 | |
Softening temperature under loadT 0.6 /℃ | ≥1350 | ≥1300 | |
Thermal shock stability (950℃ air cooling)/ time | ≥80 | ≥80 | |
Alkali resistance (1100℃x5h) | First-order | ||
Chemical composition | Al 2 O 3/% | 25~40 | 25~45 |
Fe 2 O 3/% | ≤2.0 | ||
Table 3 GRNJ physical properties of heat insulation alkali-resistant brick | |
Index | Physical performance index |
Bulk density/g/cm 3 | ≤1.65 |
Compressive strength/MPa | ≥15.0 |
Thermal conductivity (average 350℃)/(W/(m·K)) | ≤0.70 |
Heating permanent line change (1250℃x3h)/% | ≤2 |
Alkali resistance | First-order |
6 Test methods
6.1 The inspection and sample preparation of alkali resistant bricks for cement kilns shall be carried out according to GB/T 731.
6.2 The permissible deviation of product size and appearance quality shall be carried out according to GB/T 10326.
6.3 The apparent porosity test shall be carried out according to GB/T 2997.
6.4 The test of compressive strength at room temperature shall be carried out according to the provisions of GB/T 5072.
6.5 The test of the softening temperature under load shall be carried out according to the provisions of YB/T 370.
6.6 The test of thermal shock stability shall be carried out according to GB/T 30873.
6.7 Alkaline resistance shall be tested according to the provisions of JC/T 808.
6.8 Chemical composition according to GB/T 6900 and GB/T 21114. Arbitration shall be conducted in accordance with the provisions of GB/T 6900.
6.9 The inspection of the bulk density of the heat insulation alkali-resistant brick shall be carried out according to the provisions of GB/T 2998.
6.10 The inspection of the change of the heating permanent line shall be carried out according to the provisions of GB/T 5988.
6.11 The test of thermal conductivity shall be carried out according to YB/T 4130.
7 Inspection Rules
7.1 Inspection Classification
The inspection is divided into ex-factory inspection and type inspection.
7.1.1 Factory inspection
Factory inspection items include dimensional deviation, appearance quality, apparent porosity, normal temperature compressive strength, load softening temperature, bulk density, chemical composition.
7.1.2 Type inspection
The type inspection covers the whole content of Chapter 5. Type inspection shall be carried out under any of the following circumstances:
a) When there is a major change in the production process or raw materials;
b) During normal production, at least twice a year;
c) Stop production for more than half a year and resume production;
d) When the test result is significantly different from the last type test result.
7.2 Batch and sampling
7.2.1 Batch Group
Products according to the same brand group batch, each 150t for a batch, less than 150t separate batch.
Sampling acceptance of products shall be conducted according to GB/T 10325.
7.3 Qualification Rules
Products are judged according to GB/T 10325. Samples for destructive testing shall be drawn from samples that pass the inspection. All items in Chapter 5 are assessment indicators.
8 Packing, marking, transportation, storage and quality certificate
8.1 Packaging, marking, transportation and storage of products shall be carried out in accordance with GB/T 16546.
8.2 The product shall be issued with a quality certificate issued by the quality department of the supplier, which shall indicate the name of the supplier or factory mark, the name of the demander, the date of delivery, the contract number, the name of the product, the standard number, the brand number, the brick number, the lot number and the corresponding physical and chemical inspection results.
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