JC∕T 2231-2014 水泥窑用镁铁铝尖晶石耐火砖/ Magnesia ferric alumina spinel refractory brick
水泥窑用镁铁铝尖晶石耐火砖
1范围
本标准规定了水泥窑用镁铁铝尖品石耐火砖的分类和标记、技术要求、试验方法、检验规则以及标志、包装、运输、贮存和质量证明书。
本标准适用于以镁砂和预合成铁铝尖品石(化学式为FeO·Al2O3,)为主要原料经压制、烧成用于水泥窑烧成带和过渡带的耐火制品。
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致密定型耐火制品 体积密度、显气孔率和真气孔率试验方法
GB/T 5072耐火材料 常温耐压强度试验方法
GB/T 5990耐火材料 导热系数试验方法(热线法)
GB/T 7320耐火材料 热膨胀试验方法
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 16546-1996定形耐火制品包装、标志、运输和储存
GB/T 17912回转窑用耐火砖形状尺寸
GB/T 18257 回转窑用耐火砖热面标记
GB/T 21114 耐火材料 X射线荧光光谱化学分析 熔铸玻璃片法
YB/T 370 耐火制品荷重软化温度试验方法(非示差–升温法)
YB/T 376.1 耐火制品抗热震性试验方法(水急冷法)
3分类和标记
3.1分类
产品按Fe2O3,的质量百分数划分为二个牌号，即:MTL-I和 MTL-Ⅱ。MTL-I用于烧成带，MTL-Ⅱ用于过渡带。
注:牌号中 M、T、L分别为铁、铁、铝汉语拼音首字母,罗马数字为产品品种。
3.2标记
3.2.1产品标记顺序为:标准号和产品牌号。
示例:牌号为MTL-I的水泥窑用镁铁铝尖品石耐火砖，标记为:
JC/T 2231-2014 MTL-I
3.2.2产品砖号按GB/T 17912分类。
3.2.3产品应有热面标记，标记应符合GB/T 18257的要求。
4技术要求
4.1产品尺寸偏差和外观质量应符合表1的规定。
|
表1 尺寸偏差和外观质量 单位为毫米 |
||
|
项目 |
指标 |
|
|
长、高尺寸允许偏差 |
±1.5 |
|
|
楔形砖大小头尺寸 |
允许偏差 |
±1.0 |
|
楔度差 |
1.0 |
|
|
扭曲 |
≤0.5% |
|
|
缺角 |
≤20，允许:20<a+b+c<50，允许两处:≥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 |
|
0.1~0.25 |
裂纹长度≤40 |
|
|
>0.25 |
不允许 |
|
|
注:特殊要求产品的尺寸允许偏差及外观质量可由供需双方商定。 |
||
4.2理化指标应符合表2的规定。
|
表2 理化指标 |
||
|
项目 |
MTL-I |
MTL-I |
|
MgO质量百分比数/%≥ |
85.0 |
82.0 |
|
Fe2O3质量百分比数/% |
≥4.0 |
2.0~4.0 |
|
Al2O3质量百分比数/%≥ |
4.0 |
10.0 |
|
Cr2O3质量百分比数/%≤ |
0.5 |
|
|
0.2MPa 荷重软化开始温度/℃≥ |
1650 |
1680 |
|
体积密度/(g/cm3)(≥ |
2.90 |
|
|
显气孔率/%≤ |
18 |
|
|
常温耐压强度/MPa≥ |
50 |
|
|
抗热震性(1100℃,水冷)/次≥ |
6 |
|
|
热膨胀率(1 450℃)/%≤ |
1.8 |
|
|
导热系数(350℃±25℃)/[W/(m·K)]≤ |
3.5 |
3.8 |
5试验方法
5.1制样按GB/T 7321的规定进行。
5.2产品尺寸偏差和外观按GB/T 10326的规定进行。
5.3MgO、Fe2O3、Al2O3、Cr2O3;质量百分数的测定按GB/T 21114的规定进行。
5.4荷重软化温度的测定按YB/T 370的规定进行
5.5体积密度、显气孔率的试验按GB/T 2997的规定进行。
5.6常温耐压强度的试验按GB/T 5072的规定进行。
5.7抗热震性的测定按YB/T 376.1的规定进行。
5.8导热系数的测定按GB/T 5990的规定进行。
5.9热膨胀率的检测按 GB/T 7320 的规定进行。
6检验规则
6.1检验分类
检验分为出厂检验和型式检验。
6.1.1出厂检验
出厂检验项目包括尺寸允许偏差及外观质量、化学成分、荷重软化温度、体积密度、显气孔率和常温耐压强度。
6.1.2型式检验
型式检验包括表1和表2的全部内容。在下列情况下进行型式检验:
a)生产工艺或原材料有较大改变时:
b)正常生产时，每年至少进行一次;
c)停产半年以上，恢复生产时:出厂检验结果与上次型式检验结果有较大差异时:
d)出厂检验结果与上次型式检验结果有较大差异时:
e)国家质量监督机构提出型式检验要求时。
6.2组批与抽样
6.2.1产品按同一类别组批，每批不超过300t。
6.2.2抽样按GB/T 10325的规定进行
6.3判定规则
产品的判定按GB/T 10325的规定进行。
7标志、包装、运输、贮存和质量证明书
7.1标志、包装、运输和贮存按GB/T 16546-1996中3.3.1.3进行。
7.2产品出厂时应附有质量证明书，质量证明书应包括:供方名称、需方名称、生产日期、有效期限、产品名称、标准编号、牌号、批号、尺寸、外观质量和理化指标等内容。
Magnesia ferric alumina spinel refractory brick for cement kiln
1 Range
This standard specifies the classification and marking, technical requirements, test methods, inspection rules as well as marking, packaging, transportation, storage and quality certificates of magnesia ferric alumina pyropyrite refractory bricks for cement kilns.
This standard is applicable to the refractory products made of magnesia and pre-synthesized iron-aluminum cuspite (chemical formula FeO·Al2O3,) as the main raw materials by pressing and firing for cement kiln firing zone and transition zone.
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 dense shaped refractory products
GB/T 5072 refractories – normal temperature compressive strength test method
GB/T 5990 Refractory thermal conductivity test method (hot wire method)
GB/T 7320 refractory thermal expansion 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 16546-1996 Packaging, marking, transport and storage of shaped refractory products
GB/T 17912 refractory brick for rotary kiln shape and size
GB/T 18257 hot surface marking of refractory brick for rotary kiln
GB/T 21114 refractories by X-ray fluorescence spectrochemical analysis of fused cast glass sheets
Test method for Load softening temperature of YB/T 370 refractory products (non-differential warming method)
YB/T 376.1 Test method for thermal shock Resistance of Refractory products (water quench method)
3 Categorize and label
3.1 Classification
The product is divided into two grades according to the mass percentage of Fe2O3, namely: McL-I and McL-II. McL-I is used for the firing zone, and McL-II is used for the transition zone.
Note: In the brand, M, T and L are the initial letters of iron, iron and aluminum respectively, and Roman numerals are the product varieties.
3.2 Tags
3.2.1 Product marking sequence: standard number and product brand.
Example: cement kiln magnesium-ferrium-aluminite refractory brick, grade McL-I, marked:
JC/T 2231-2014 MTL-I
3.2.2 Product brick number is classified by GB/T 17912.
3.2.3 The product shall be marked with hot surface, which shall meet the requirements of GB/T 18257.
4 Technical Requirements
4.1 The size deviation and appearance quality of the product shall comply with the provisions of Table 1.
|
Table 1 Dimensional deviation and appearance quality Unit in millimeter |
||
|
Item |
Index |
|
|
Permissible deviation of long and high dimensions |
±1.5 |
|
|
Wedge brick size head size |
Allowable deviation |
±1.0 |
|
Wedge difference |
1.0 |
|
|
Contort |
≤0.5% |
|
|
Missing corner |
≤20，Value :20<a+b+c<50. Two values are allowed :≥50 The value is not allowed |
|
|
Wane |
≤30，The value is 30<e+f+g<60. Three values are allowed :≥60 The value is not allowed |
|
|
Crack |
Breadth<0.1 |
Permit |
|
0.1~0.25 |
Crack length≤40 |
|
|
>0.25 |
Not allow |
|
|
Note: The permissible size deviation and appearance quality of products with special requirements can be agreed by both parties. |
||
4.2 Physical and chemical indexes shall comply with the provisions of Table 2.
|
Table 2 Physical and chemical indexes |
||
|
Item |
MTL-I |
MTL-I |
|
MgO mass percentage/%≥ |
85.0 |
82.0 |
|
Fe2O3mass percentage/% |
≥4.0 |
2.0~4.0 |
|
Al2O3mass percentage/%≥ |
4.0 |
10.0 |
|
Cr2O3mass percentage/%≤ |
0.5 |
|
|
0.2MPa load softening starting temperature/℃≥ |
1650 |
1680 |
|
Bulk density/(g/cm3)(≥ |
2.90 |
|
|
Apparent porosity/%≤ |
18 |
|
|
Compressive strength at room temperature/MPa≥ |
50 |
|
|
Thermal shock resistance(1100℃,水冷)/次≥ |
6 |
|
|
Thermal expansion rate(1 450℃)/%≤ |
1.8 |
|
|
Thermal conductivity(350℃±25℃)/[W/(m·K)]≤ |
3.5 |
3.8 |
5 Test methods
5.1 Sample preparation shall be carried out according to GB/T 7321.
5.2 Product size deviation and appearance shall be in accordance with GB/T 10326.
5.3MgO, Fe2O3, Al2O3, Cr2O3; The mass percentage is determined according to GB/T 21114.
5.4 The load softening temperature shall be determined according to YB/T 370
5.5 The test of bulk density and apparent porosity shall be carried out according to GB/T 2997.
5.6 The compressive strength test at room temperature shall be carried out according to the provisions of GB/T 5072.
5.7 Thermal shock resistance shall be measured according to YB/T 376.1.
5.8 The thermal conductivity is determined according to GB/T 5990.
5.9 The thermal expansion rate shall be measured according to GB/T 7320.
6 Inspection Rules
6.1 Inspection Classification
The inspection is divided into ex-factory inspection and type inspection.
6.1.1 Factory inspection
Factory inspection items include size tolerance and appearance quality, chemical composition, load softening temperature, bulk density, apparent porosity and room temperature compressive strength.
6.1.2 Type inspection
The type inspection includes all the contents of Tables 1 and 2. Type inspection is performed in the following cases:
a) When there are major changes in the production process or raw materials:
b) At least once a year during normal production;
c) Stop production for more than half a year and resume production: When there is a big difference between the factory inspection results and the last type inspection results:
d) When there is a big difference between the factory inspection result and the last type inspection result:
e) When the national quality supervision agency proposes the type inspection requirements.
6.2 Batch and sampling
6.2.1 Products shall be grouped into batches of the same category, with each batch not exceeding 300t.
6.2.2 Sampling shall be conducted according to GB/T 10325
6.3 Decision Rules
The product is judged according to GB/T 10325.
7 Marking, packing, transportation, storage and quality certificate
7.1 Marking, packing, transportation and storage shall be carried out in accordance with 3.3.1.3 in GB/T 16546-1996.
7.2 The product shall be accompanied by a quality certificate when it leaves the factory. The quality certificate shall include: supplier name, demander name, production date, validity period, product name, standard number, brand number, batch number, size, appearance quality and physical and chemical index.
