石灰窑用高纯莫来石砖

1 范围

  本标准规定了石灰窑用高纯莫来石砖的形状尺寸、技术要求、试验方法、质量评定程序、包装、标志、运输、储存和质量证明书。

  本标准适用于石灰窑煅烧带前后过渡段及套筒窑拱桥部位用高纯莫来石砖。

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,仅所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 2992.1 耐火砖形状尺寸 第1部分:通用砖

  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 5072耐火材料 常温耐压强度试验方法

  GB/T 5988耐火材料 加热永久线变化试验方法

  GB/T 6900铝硅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

  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形状尺寸

  砖的形状尺寸应符合 GB/T 2992.1的规定,或按需方提供的图纸进行生产.

4 技术要求

4.1 石灰窑用高纯莫来石砖的理化指标应符合表1规定。

表1石灰窑用高纯莫来石砖的理化指标
项目		指标
w(Al2O3 )/%	μ0≥	70
w(Fe2O3)/%	μ0≤	1.0
显气孔率/%	μ0≤	18
	σ	1.0
体积密度/(g/cm3)	μ0≥	2.55
	σ	0.05
常温耐压强度/MPa	L≥	80
	σ	8
抗热震性(1100℃,水冷)/次	μ0≥	17
	σ	2
加热永久线变化(1500℃X2h)/%	L~U	-0.1~+0.2
	σ	0.05
0.2MPa荷重软化开始温度/℃	μ0≥	1680

4.2 石灰窑用高纯莫来石砖的尺寸允许偏差及外观应符合表 2规定。

表2石灰窑用高纯莫来石砖的尺寸允许偏差及外观 单位为毫米
项目			指标
尺寸允许偏差	尺寸≤100		±1.0
	100<尺寸≤300		±2.0
	尺寸>300		±3.0
扭曲	对角线长度≤350	≤	1.5
	对角线长度>350		2.0
缺角长度(a+b+c)			50
缺棱长度(e+f+g)			60
熔洞直径	工作面		5
	非工作面		7
裂纹长度	宽度<0.10		不限制
	宽度0.10~0.25		50
	宽度>0.25		不准有
断面层裂			不准有
厚度相对边差			1

5 试验方法

5.1 试样制备按 GB/T 7321 进行。

5.2 Al₂O₃、Fe₂O₃,含量的测定按 GB/T 6900 或 GB/T 21114 进行。

5.3 体积密度、显气孔率的测定按 GB/T 2997 进行。

5.4 常温耐压强度的测定按 GB/T 5072 进行。

5.5 抗热震性的测定按 YB/T 376.1 进行。

5.6 加热永久线变化的测定按 GB/T 5988 进行。

5.7荷重软化温度的测定按 YB/T 370 进行。

5.8 砖的尺寸、外观及断面的检査按 GB/T 10326 进行,

6 质量评定程序

6.1 组批

  按 GB/T 10325 进行组批,每批不应超过 300t。

6.2 抽样及合格判定规则

6.2.1 抽样与验收按 GB/T 10325 进行。

6.2.2 化学成分和显气孔率、常温耐压强度、荷重软化开始温度及抗热震性为验收检验项目。

6.3 合格评定形式

  合格评定可采用供货方声明、使用方认定或第三方认证的形式进行。

7 包装、标志、运输、储存和质量证明书

7.1 砖的包装、标志、运输、储存按 GB/T 16546 进行或按合同约定执行。

7.2 砖发出时应附有供方质量部门签发的质量证明书,载明供方名称或厂标、需方名称、发货日期、合同号、标准编号、产品名称、砖号、批号及相应的理化检验结果.

 

 

 

High-purity mullite bricks for lime kiln

1 Range

  This standard specifies the shape and size, technical requirements, test methods, quality assessment procedures, packaging, marking, transportation, storage and quality certificates of high purity mullite bricks for lime kilns.

This standard is applicable to the high purity mullite brick used in the transition section of calcined belt and arch bridge of sleeve kiln.

2 Normative reference documents

  The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendment orders) applies to this document.

  GB/T 2992.1 Shape and dimensions of refractory bricks – Part 1: general purpose bricks

  Test method for bulk density, apparent porosity and true porosity of GB/T 2997 compact shaped refractory products

  GB/T 5072 refractories – normal temperature compressive strength test method

  GB/T 5988 refractory heating permanent line change test method

  GB/T 6900 aluminum-silicon refractory chemical analysis 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 shaped refractory products packaging, marking, transportation and storage

  GB/T 21114 Refractories X-ray fluorescence spectrochemical analysis – fusion-cast glass sheet method

  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 Shape and Size

  The shape and size of the brick shall comply with the provisions of GB/T 2992.1, or be produced according to the drawings provided by the buyer.

4 Technical Requirements

4.1 The physical and chemical indexes of high-purity mullite bricks used in lime kilns shall comply with the provisions of Table 1.

Table 1 Physical and chemical indexes of high purity mullite bricks used in lime kilns
Item		Index
w(Al2O3 )/%	μ0≥	70
w(Fe2O3)/%	μ0≤	1.0
Apparent porosity/%	μ0≤	18
	σ	1.0
Bulk density/(g/cm3)	μ0≥	2.55
	σ	0.05
Compressive strength at room temperature/MPa	L≥	80
	σ	8
Thermal shock resistance (1100℃, water cooling)/ time	μ0≥	17
	σ	2
Heating permanent line change(1500℃X2h)/%	L~U	-0.1~+0.2
	σ	0.05
0.2MPa load softening starting temperature/℃	μ0≥	1680

 

4.2 The size permissible deviation and appearance of high purity mullite brick for lime kiln shall comply with the provisions of Table 2.

Table 2 Size tolerance and appearance of high purity mullite brick for lime kiln Unit in millimeter
Item			Index
Allowable deviation of dimension	Dimension≤100		±1.0
	100<Dimension≤300		±2.0
	Dimension>300		±3.0
Contort	Diagonal length≤350	≤	1.5
	Diagonal length>350		2.0
Missing Angle length(a+b+c)			50
Missing edge length(e+f+g)			60
Hole diameter	Working face		5
	Non-working face		7
Crack length	Breadth<0.10		No limit
	Breadth0.10~0.25		50
	Breadth>0.25		Be forbidden from
Fracture lamination			Be forbidden from
Thickness relative to edge difference			1

 

5 Test methods

5.1 Sample preparation was carried out according to GB/T 7321.

5.2 Al₂O₃、Fe₂O₃, content determination according to GB/T 6900 or GB/T 21114.

5.3 The bulk density and apparent porosity were measured according to GB/T 2997.

5.4 The compressive strength at room temperature shall be measured according to GB/T 5072.

5.5 Thermal shock resistance was measured according to YB/T 376.1.

5.6 The determination of permanent line change of heating was performed according to GB/T 5988.

5.7 The load softening temperature was measured according to YB/T 370.

5.8 The inspection of the size, appearance and section of the brick shall be carried out according to GB/T 10326.

6 Quality assessment procedures

6.1 Batch Groups

  Batch according to GB/T 10325, each batch should not exceed 300t.

6.2 Sampling and conformity determination rules

6.2.1 Sampling and acceptance shall be conducted according to GB/T 10325.

6.2.2 Chemical composition and apparent porosity, normal temperature compressive strength, load softening starting temperature and thermal shock resistance are the acceptance inspection items.

6.3 Form of conformity assessment

  The conformity assessment can be made in the form of the supplier’s declaration, the user’s certification or the third party’s certification.

7 Packing, marking, transportation, storage and quality certificate

7.1 The packing, marking, transportation and storage of bricks shall be carried out in accordance with GB/T 16546 or in accordance with the contract.

7.2 The bricks shall be issued with a quality certificate issued by the quality department of the supplier, indicating the name of the supplier or factory standard, the name of the demander, the date of delivery, the contract number, the standard number, the product name, the brick number, the lot number and the corresponding physical and chemical inspection results.