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Basic lining material
1 Range
This standard specifies the classification, technical requirements, test methods, inspection specifications, packaging, marking, transportation, storage and quality certificates of basic lining materials for intermediate frequency furnaces.
This standard applies to basic lining materials
2 Normative reference documents
The terms of the following documents become terms of this Standard by reference to this Standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this Standard. Any undated reference document, which. The new version applies to this standard.
GB/T5069.11 Method for chemical analysis of magnesia and Mg-Al series refractories
GB/T15545 amorphous refractory packaging, marking, transportation and storage
GB/T17617 Sampling of refractory raw materials and amorphous refractory materials
Test method for apparent porosity and bulk density of YB/T 5200 dense refractory castables
YB/T5202.1-2003 Method for preparing samples of amorphous refractors-Part 4: Refractory ramming materials
3 Classification
Basic lining materials are divided into magnesium and magnesium aluminum two types.
Magnesium is divided into B-95, B-96 and B-97 by volume density
Magnesium aluminum is divided into BL-96 and BL-97 according to aluminum content
4 Technical Requirements
The physical and chemical indexes of basic lining materials shall conform to the provisions of Table 1.
Table 1 Physical and chemical indexes of basic lining materials
| item |
B-95 |
B-96 |
B-97 |
BL-96 |
BL-97 |
Allowable deviation of single value at recheck |
| W(MgO)/% ≥ |
94 |
95 |
96 |
71 |
72 |
0.5 |
| W(Al2O3)/%≥ |
__ |
__ |
__ |
21 |
23 |
0.2 |
| W(Fe2O3+SiO2)/≤ |
1.2 |
1.2 |
1.2 |
1.2 |
1.2 |
+ 0.05 |
| Volume density ≥ |
2.7 |
2.75 |
2.8 |
2.9 |
2.9 |
0.1 |
5 Test methods
5.1 Prepare the sample according to YB/5202.1-2003
5.2 W(MgO)/% is determined according to GB/T6900
5.3 Volumetric density shall be determined according to YB/T 5200
6 Inspection Rules
6.1 Products shall be codified according to the same brand, each batch shall not exceed 10t, and shall be separately codified when raw materials are changed.
6.2 Product sampling shall be carried out according to GB/T17617. If one of the test results is unqualified, double samples should be taken again, and the non-compliant items should be reinspected. The allowable deviation and average value of the retest results should comply with the provisions of Table 1. Otherwise, this batch of products is unqualified
6.3 Chemical composition, volume density is required
7 Packing, marking, transportation, storage and quality certificate
7.1 Packaging, marking, transportation and storage of products shall be carried out in accordance with GB/T 15545. The storage life of the product is 180d.
7.2 The product shall be accompanied by the quality certificate issued by the quality supervision department of the Company when it leaves the factory.
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