JC/T496-2020水泥窑用耐碱砖 alkali-resistant bricks for cement kiln
水泥窑用耐碱砖
1范围
本标准规定了水泥窑用耐碱砖的术语与定义、分类和标记、技术要求、试验方法、检验规则、包装、标志、运输、贮存和质量证明书。
本标准适用于水泥窑用耐碱砖
2规范性引用文件
下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅注日期的版本适用于本文件。
凡是不注日期的引用文件，其最新版本(包括所有的修改单)适用于本文件。
GB/T 2997致密定形耐火制品 体积密度、显气孔率和真气孔率试验方法。
GB/T 2998致密隔热耐火制品 体积密度和真气孔率试验方法。
GB/T 5988耐火材料 加热永久线变化试验方法。
GBT 5072耐火材料 常温耐压强度试验方法。
GB/T 6900硅铝系耐火材料化学分析方法。
GB/T 7321定形耐火制品试样制备方法。
GB/T 10325定形耐火制品验收抽样检验规则。
GB/T 10326定形耐火制品尺寸、外观及断面的检查方法。
GB/T 16546定形耐火制品包装、标志、运输和储存。
GBY18930耐火材料术语。
GB/T 21114耐火材料 X射线荧光光谱化学分析 熔铸玻璃片法。
GB/T 30873耐火材料抗热震性试验方法。
JC/T 808硅铝质耐火浇注料耐破性试验方法。
YB/T 370耐火材料荷重软化温度试验方法(非示差-升温法)。
YB/T 4130耐火材料导热系数试验方法《水流量平板法)。
GB/T 18930界定的以及下列术语和定义适用于本文件。
3术语和定义
3.1
水泥窑用耐碱砖alkali-resistant bricks for cement kiln
以低铝耐火粘土为主要原料制成的，在水泥窑系统中具有优良抗碱侵蚀性能的硅铝系耐火制品。
4分类和标记
4.1分类
制品根据性能不同分为普通耐碱砖PNJ、高强耐碱砖GNJ、隔热耐碱砖GRNJ3种牌号。
4.2标记
制品标记顺序:制品名称、品种和标准号。
示例:高强耐碱砖标记为:高强耐碱砖GNJJC/T 496-XXXX。
5 技术要求
5.1 制品的尺寸允许偏差、外观质量应符合表1的规定
|
表1制品尺寸允许偏差和外观质量单位为毫米 |
||
|
项目 |
指标 |
|
|
尺寸允许偏差 |
<110 |
±1.0 |
|
≥110，≤200 |
±1.5 |
|
|
>200 |
±2.0 |
|
|
楔形砖大小头尺寸差值 |
±1.0 |
|
|
扭曲 |
≤0.5% |
|
|
缺角 |
≤20允许20<a+b+c<50,允许二处，≥50不允许 |
|
|
缺棱 |
≤30允许30<e+f+g<60,允许三处，≥60不允许 |
|
|
裂纹 |
宽度<0.1 |
允许 |
|
宽度≥0.1，≤0.25 |
裂纹长度≤ 40 |
|
|
宽度>0.25 |
不允许 |
|
|
注:特殊要求制品的尺寸允许偏差及外观质量要求由供需双方商定。 |
||
5.2制品的理化性能指标应符合表2和表3的规定。
|
表2普通耐碱砖PNJ、高强耐碱砖GNJ的理化性能指标 |
|||
|
项目 |
指标 |
||
|
普通耐碱砖PNJ |
高强耐碱砖GNJ |
||
|
物理性能 |
显气孔率/% |
≤20 |
≤18 |
|
常温耐压强度/MPa |
≥30 |
≥60 |
|
|
荷重软化温度(0.2MPa，T0.6)/℃ |
≥1350 |
≥1300 |
|
|
热震稳定性(950℃空气急冷)/次 |
≥80 |
≥80 |
|
|
耐碱性(1100℃x5h) |
一级 |
||
|
化学成分 |
Al2O3/% |
25~40 |
25~45 |
|
Fe2O3/% |
≤2.0 |
||
|
表3隔热耐碱砖GRNJ物理性能指标 |
|
|
项目 |
物理性能指标 |
|
体积密度/(g/cm³) |
≤1.65 |
|
常温耐压强度/MPa |
≥15.0 |
|
导热系数(平均350℃)/(W/(m·K)) |
≤0.70 |
|
加热永久线变化(1250℃x3h)/% |
≤2 |
|
耐碱性 |
一级 |
6试验方法
6.1水泥窑用耐碱砖的检验制样按GB/T 731的规定进行。
6.2制品尺寸允许偏差和外观质量按GB/T 10326的规定进行。
6.3显气孔率的检验按GB/T 2997的规定进行。
6.4常温耐压强度的检验按GB/T 5072的规定进行。
6.5荷重软化温度的检验按YB/T 370的规定进行。
6.6热震稳定性的检验按GB/T 30873的规定进行。
6.7耐碱性的检验按JC/T 808的规定进行。
6.8化学成分按GB/T 6900和GB/T 21114的规定进行。仲裁时按GB/T 6900的规定进行。
6.9隔热耐碱砖体积密度的检验按GB/T 2998的规定进行。
6.10加热永久线变化的检验按GB/T 5988的规定进行。
6.11导热系数的检验按YB/T 4130的规定进行。
7检验规则
7.1检验分类
检验分出厂检验和型式检验。
7.1.1出厂检验
出厂检验项目包括尺寸偏差、外观质量、显气孔率、常温耐压强度、荷重软化温度、体积密度、化学成分。
7.1.2型式检验
型式检验包括第5章的全部内容。有下列情况之一时，应进行型式检验:
a)生产工艺或原材料有较大改变时;
b)正常生产时，每年至少进行两次；
c)停产半年以上，恢复生产时;
d)出检验结果与上次型式检验结果有较大差异时。
7.2组批与抽样
7.2.1组批
制品按同一牌号组批，每150t为一批，不足150t单独成批。
7.2.2抽样
制品的抽样验收按GB/T 10325进行。
7.3合格判定规则
制品的判定按GB/T 10325进行。破坏性检验的样品应从外观检查合格的样本中抽取。第5章中所有项目为考核指标。
8包装、标志、运输、储存和质量证明书
8.1制品的包装、标志、运输和储存按GB/T 16546进行。
8.2制品发出时应附有供方质量部门签发的质量证明书，质量证明书应载明供方名称或厂标、需方名称、发货日期、合同号、制品名称、标准编号、牌号、砖号、批号及相应的理化检验结果。
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 shaped refractory products acceptance sampling inspection rules.
GB/T 10326 shaped refractory products size, appearance and section inspection method.
GB/T 16546 shaped refractory products packaging, marking, transportation and storage.
GBY18930 Refractory terminology.
GB/T 21114 refractories by X-ray fluorescence spectrochemical analysis of fused cast glass sheets.
Test method for thermal shock resistance of GB/T 30873 refractories.
JC/T 808 Test method for break resistance of silica-alumina refractory castables.
Test method for softening temperature of YB/T 370 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<a+b+c<50, two places are allowed |
|
|
Wane |
≤20 20<a+b+c<50, two places are allowed, and ≥50 is not allowed |
|
|
Crack |
Breadth<0.1 |
≤30 30<e+f+g<60, three places are allowed, and ≥60 is not allowed |
|
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 loadT0.6/℃ |
≥1350 |
≥1300 |
|
|
Thermal shock stability (950℃ air cooling)/ time |
≥80 |
≥80 |
|
|
Alkali resistance (1100℃x5h) |
First-order |
||
|
Chemical composition |
Al2O3/% |
25~40 |
25~45 |
|
Fe2O3/% |
≤2.0 |
||
|
Table 3 GRNJ physical properties of heat insulation alkali-resistant brick |
|
|
Index |
Physical performance index |
|
Bulk density/g/cm3 |
≤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.
7.2.2 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.
