镁质、镁铝质、镁铬质耐火泥浆

1范围

  本标准规定了镁质、镁铝质,镁铬质耐火泥浆的分类,技术要求、试验方法、质量评定程序、包装、标志、运输、贮存及质量证明书。

  本标准适用于砌筑镁砖、镁铝砖、镁铬砖等用的镁质、镁铝质、镁铬质耐火泥浆

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 5069镁铝系耐火材料化学分析方法

  GB/T 5070含铬耐火材料化学分析方法

  GB/T 15545不定形耐火材料包装、标志、运输和储存

  GB/T 17617耐火原料和不定形耐火材料 取样

  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 22459.3 耐火泥浆 第3部分:粘接时间试验方法

  GB/T 22459.4耐火泥浆 第4部分:常温抗折粘接强度试验方法

  GB/T 22459.5耐火泥浆 第5部分:粒度分布(分析)试验方法

  GB/T 22459.7耐火泥浆 第7部分:高温性能试验方法

3分类

  镁质耐火泥浆按MgO含量分为:MN-91、MN-95、MN-97三个牌号;镁铝质耐火泥浆按MgO含量分为:MLN-70,MLN-80两个牌号;镁铬质耐火泥浆按Cr₂O₃,含量分为:MGN-8、MGN-12、MGN-16,MGN-20四个牌号。

  L、G、N分别代表镁、铝、铬、泥浆的汉语拼音首字母,其后的数字分别代表MgO,Cr₂O₃的质量分数。

4技术要求

镁质、镁铝质、镁铬质耐火泥浆的理化指标应分别符合表1、表2、表3的规定,化学成分以灼烧后为基准。

表1 镁质耐火泥浆的理化指标
项目			指标
			MN-91	MN-95	MN-97
w(MgO)/% 不小于			91	95	97
常温抗折粘接强度/MPa	110℃干燥后 不小于		1.5
	1500℃X3h烧后	不小于	3.0
加热永久线变化率/%	1500℃X3h烧后		-4~+1
粘接时间/min			1~3
粒度/%	<1.0mm		100
	>0.5mm 不大于		2
	<0.075mm 不小于		60
如有特殊要求,粘接时间由供需双方协商确定。

表2镁铝质耐火泥浆的理化指标
项目			指标
			MLN-70	MLN-80
w(MgO)/% 不小于			70	80
w(Al2O3)/%			8~20	5~10
常温抗折粘接强度/MPa	110℃干燥后	不小于	1.5
	1500℃X3h烧后	不小于	3.0
加热永久线变化率/%	1500℃X3h烧后		-4~+1
粘接时间/min			1~3
粒度/%	<1.0mm		100
	>0.5mm不大于		2
	<0.075mm 不小于		60
如有特殊要求,粘接时间由供需双方协商确定，

表3镁铬质耐火泥浆的理化指标
项目			指标
			MGN-8	MGN-12	MGN-16	MGN-20
w(MgO)/%			70~80	≥60	≥55	≥50
w(Cr2O₃)/%			4~9	≥12	≥16	≥20
常温抗折粘接强度/MPa	110℃干燥后	不小于	1.0
	1500℃X3h烧后	不小于	2.0
加热永久线变化率/%	1500℃X3h烧后		-4~+1
粘接时间/min			1~3
粒度/%	<1.0mm		100
	>0.5mm 不大于		2
	0.075mm 不小于		60
如有特殊要求,粘接时间由供需双方协商确定。

5试验方法

5.1化学分析以灼烧后试样按GB/T 21114或镁质、镁铝质按GB/T 5069、镁铬质按GB/T 5070进行。

5.2常温抗折粘接强度的检验按GB/T 22459.4进行。

5.3加热永久线变化率的检验按GB/T 22459.7进行,

5.4粘接时间的检验按GB/T 22459.3进行。

5.5粒度分布(筛分析)的检验按GB/T 22459.5进行。

6质量评定程序

6.1组批

6.1.1产品按连续正常生产的同一牌号组批。原料或生产工艺变动时,应另行组批。

6.1.2同一牌号产品的最大批量不应超过60t。

6.2抽样

  产品的抽样按 GB/T 17617的规定进行。

6.3判定规则

  化学成分、常温抗折粘接强度、加热永久线变化率为验收检验项目。检验结果均符合表1、表2、表3的规定值时,该批产品为合格。

  检验结果有不合格项时,应按6.2的规定重新抽取试样进行检验。检验结果符合表1、表2、表3的规定,则判定该批产品合格;否则,判为不合格。

6.4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、贮存及质量证明书

7.1包装、标志、运输及贮存应符合 GB/T 15545的规定。7.2液体结合剂可分别包装发货。

7.3产品发出时供方应提供质量证明书和产品使用说明书,质量证明书应载明供方名称、需方名称、生产日期、合同号、标准编号、产品名称、牌号、批号、理化指标及保存期等内容。

 

 

 

Magnesia, magnesia aluminum, magnesia chrome refractory mud

1 Range

  This standard specifies the classification, technical requirements, test methods, quality assessment procedures, packaging, marking, transportation, storage and quality certificate of magnesia, magnesia aluminum, magnesia chrome refractory mud.

  This standard is applicable to magnesia, magnesia, magnesia, magnesia, magnesia refractory mud used in laying magnesia brick, magnesia aluminum brick, magnesia chrome brick, etc

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 5069 method for chemical analysis of MG-Al refractories

  GB/T 5070 chromium containing refractory chemical analysis method

  GB/T 15545 amorphous refractory packaging, marking, transportation and storage

  GB/T 17617 Sampling of refractory raw materials and amorphous refractories

  GB/T 21114 refractories by X-ray fluorescence spectrochemical analysis of fused cast glass sheets

  GB/T 22459.3 Refractory mud – Part 3: Test method for bonding time

  GB/T 22459.4 Refractory mud – Part 4: Test method for bending and bonding strength at room temperature

  GB/T 22459.5 Refractory mud – Part 5: Test method for particle size distribution (analysis)

  GB/T 22459.7 Refractory mud – Part 7: Test method for high temperature performance

3 Categories

  Magnesium refractory mud according to MgO content is divided into :MN-91, MN-95, MN-97 three grades; Mg-aluminum refractory mud according to MgO content is divided into :MLN-70,MLN-80 two grades; Magnesium chrome refractory mud according to Cr2O3, content is divided into: MG-8, MG-12, MG-16, MG-20 four grades.

  M, L, G, and N respectively represent the initial letters of the Chinese pinyin of magnesium, aluminum, chromium, and mud, and the following numbers represent the mass fraction of MgO and Cr2O3 respectively.

4 Technical Requirements

The physical and chemical indexes of magnesia, magnesia aluminum and magnesia chromium refractory mud should conform to the provisions of Table 1, Table 2 and Table 3 respectively, and the chemical composition is based on the burning.

Table 1. Physical and chemical indexes of magnesia refractory mud
Item			Inedx
			MN-91	MN-95	MN-97
w(MgO)/% No less than			91	95	97
Flexural bond strength at room temperature/MPa	110℃ After drying No less than		1.5
	1500℃X3h After burning	No less than	3.0
Heating permanent line change rate/%	1500℃X3h After burning		-4~+1
Bonding time/min			1~3
Particle size /%	<1.0mm		100
	>0.5mm Not more than		2
	<0.075mm No less than		60
If there are special requirements, the bonding time is determined by the supply and demand parties through negotiation.

Table 2 Physical and chemical indexes of MG-alumina refractory mud
Item			Inedx
			MLN-70	MLN-80
w(MgO)/% No less than			70	80
w(Al2O3)/%			8~20	5~10
Flexural bond strength at room temperature/MPa	110℃ After drying	No less than	1.5
	1500℃X3h After burning	No less than	3.0
Heating permanent line change rate/%	1500℃X3hAfter burning		-4~+1
Bonding time/min			1~3
Particle size /%	<1.0mm		100
	>0.5mmNot more than		2
	<0.075mm No less than		60
If there are special requirements, the bonding time is determined by the supply and demand parties through negotiation.

Table 3. Physical and chemical indexes of magnesia-chromium refractory mud
Item			Inedx
			MGN-8	MGN-12	MGN-16	MGN-20
w(MgO)/%			70~80	≥60	≥55	≥50
w(Cr2O₃)/%			4~9	≥12	≥16	≥20
Flexural bond strength at room temperature/MPa	110℃ After drying	No less than	1.0
	1500℃X3hAfter burning	No less than	2.0
Heating permanent line change rate/%	1500℃X3hAfter burning		-4~+1
Bonding time/min			1~3
Particle size /%	<1.0mm		100
	>0.5mm Not more than		2
	0.075mm No less than		60
If there are special requirements, the bonding time is determined by the supply and demand parties through negotiation.

5 Test methods

5.1 Chemical analysis shall be carried out according to GB/T 21114 or GB/T 5069 for magnesium, Mg-aluminum, and GB/T 5070 for magnesium chromium after burning.

5.2 The bending and bonding strength at room temperature shall be tested according to GB/T 22459.4.

5.3 The test of the change rate of the heating permanent line shall be carried out according to GB/T 22459.7.

5.4 The bonding time is tested according to GB/T 22459.3.

5.5 Particle size distribution (sieve analysis) was tested according to GB/T 22459.5.

6 Quality assessment procedures

6.1 Batch Groups

6.1.1 The products shall be batch according to the same grade of continuous normal production. In case of changes in raw materials or production processes, separate batches should be made.

6.1.2 The maximum quantity of the same brand product shall not exceed 60t.

6.2 Sampling

  Sampling of products is carried out according to GB/T 17617.

6.3 Decision Rules

  Chemical composition, bending and bonding strength at room temperature, and change rate of heating permanent line are the acceptance inspection items. When the test results meet the specified values in Table 1, Table 2 and Table 3, the batch of products is qualified.

  If there is any unqualified item in the test result, the sample shall be taken again for testing in accordance with the provisions of 6.2. The inspection results meet the requirements of Table 1, Table 2 and Table 3, and the batch of products are judged to be qualified; Otherwise, it is disqualified.

6.4 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 Packaging, marking, transportation and storage shall comply with the provisions of GB/T 15545.

7.2 Liquid binders can be packaged and shipped separately.

7.3 When the products are issued, the supplier shall provide the quality certificate and the product instruction manual. The quality certificate shall contain the name of the supplier, the name of the demander, the production date, the contract number, the standard number, the product name, the brand number, the batch number, the physical and chemical index and the storage period.