This standard specifies the classification, technical requirements, test methods and inspection rules of high-alumina refractory slurry. This standard is applicable to high-alumina refractory slurry used for laying high-alumina refractory bricks and corundum bricks. GB/T 2994-1994 High-alumina refractory slurry GB/T2994-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
High alumina refractory mortars
High alumina refractory mortars 1 Subject content and scope of application
This standard specifies the classification, technical requirements, test methods and inspection rules of commercial alumina refractory mortars. This standard is applicable to the research and development of high-alumina refractory slurry for high-quality refractory bricks and corundum bricks. 2 Reference standards GB 5024.2 Test method for bonding time of refractory slurry GB5024.3 Test method for cold flexural bond strength of refractory slurry GB6900.4 Chemical analysis method for clay and high-alumina refractories GB7316 Test method for refractoriness of refractory slurry GB 7318 Test method for sieve analysis of refractory slurry Test method for change rate of refractory slurry bleeding line GB7319 YB4024 Test method for resoftening strength of refractory slurry under load 3 Product classification High-alumina refractory slurry is divided into two categories and 8 grades according to A1, O: content and bonding strength. 3.1 Ordinary high-lead refractory slurry, LV-55A, LN-65A, LN75A. GB/T 2994 94
Replaces GR2991-82
3.2 Phosphate-bonded high-alumina refractory slurry: LN-55B, LN-65B, LN.75B, LN-85B, GN 85B4 Technical requirements
The chemical indexes of high-alumina refractory slurry shall meet the requirements of Table 1. Table 1 High-alumina refractory slurrying index
Refractoriness.
Not less than
Cold flexural strength,
Adhesive strength
Greater than
After drying at 110℃
After burning at 1400℃×3h
After burning at 1500℃×31
Approved by the State Administration of Technical Supervision on June 13, 1994IN 55R IN-65A
［.N-758
IN-55R IN.75A
/IN &hBIGN-HE
Implemented on January 1, 1995
0. 2 MPa Load softening temperature filtration, r
Not less than
Line change rate
1400℃×3h after firing
1500x3h firing piece
Bond time], niru
LN-5SA
Not less than
-0. 071 yuan m not less than
GB/T 2994—94
Continued installation 1
LN-553
Jiang; if there are special requirements, the new time will be provided by the two parties through agreement. 5 Test method
The test of refractoriness shall comply with the provisions of GB7316. 5.1
1N 654
LN-65E
LN-75A
5.2 The test of cold flexural bond strength shall comply with the provisions of GB5024.3. 5.3 The particle size screening plate shall comply with the provisions of G7318. The test of fine setting time shall comply with the provisions of 5024.2. 5.4
The test of linear change rate shall comply with the specifications of B7319, and the test of load softening temperature shall comply with the provisions of YB4024. 5.6
Chemical analysis shall comply with the provisions of GB 6900.4. 5.7
6 Inspection rules
6.1 Inspection classification
6.1.1 Type inspection
Type inspection should be carried out in any of the following situations: 6. 1. 1. 1
The first production or trial production of the product in the factory; tr
After normal production, if there are major changes in materials and processes, which may affect product performance; during normal production, after regular or accumulated production; when the product is resumed after a long period of suspension; d.
IN·75B
LN-85K
When the factory inspection results are significantly different from the first type inspection. e.
6.1.1.2 The type inspection of the product includes all the indicators specified in the standard and other indicators proposed by the user. 6.1.2 Final inspection
For products of one inspection batch, all the indexes in the standard shall be inspected at the same time. If the inspection batch is less than one, it shall be inspected as one batch of products.
6.2 Batch rules
6.2.1 The products of one brand produced under continuous normal production conditions shall be regarded as one production batch. When the raw materials or production process change, batches shall be compiled.
6.2.2 For products of the same production batch, every 5 pieces shall be a test batch. If the number is less than 50 pieces, it shall also be used as a test batch. 6.3 Sample specification
6.3.1 Type sampling
GB/T 2994-94
For each test batch, 2 pieces shall be randomly sampled (the sampling interval shall not be less than 10 pieces), and 21k% shall be sampled each time. The samples shall be divided into 5kg by the original cone μ dividing method or the two dividers, and the two samples shall be mixed and evenly mixed as the test sample. 6.3.2 Sampling shall comply with the provisions of Chapter 2 of GB5024, 2. 6. 4 Judgment rules
6.4.1 When one of the test results does not meet the standard, two re-test samples shall be taken according to the provisions of 6.3.2 to re-test the unqualified index. bzxz.net
6.4.2 When the results of the two re-test samples meet the standard, the batch of products is judged to be qualified, otherwise it is unqualified. 7 Marking, packaging, transportation, storage and quality certificate 7.1 The packaging bag (barrel) must be marked with the product name, brand, net weight, shelf life, production date, moisture-proof mark and manufacturer name. 7.? The packaging bag (barrel) must be moisture-proof. The packaging weight of each bag (barrel) shall be determined by agreement between the supply and demand parties. 7.3 The transportation vehicle shall be clean Clean, with rain and driving protection facilities. 7.4 Pay attention to moisture-proof when purchasing and storing, and it is strictly forbidden to mix with other impurities. 7.5 When a batch of products is sent out, it must be accompanied by a quality certificate issued by the technical supervision department, stating the supplier's business name or trademark, the purchaser's name, standard number, product name, brand. Batch number, physical and chemical index test results, shelf life, production period and delivery period. Additional notes:
This standard was drafted by the Wuhan Metallurgical Construction Research Institute of the Ministry of Metallurgical Industry. In addition, the Hunan Liling Unshaped Refractory Material Factory and the Pingdingshan Refractory Slurry Factory participated in the drafting.
The main drafters of this standard are Wang Changqing and Su Boping. The standard level of this standard is marked as GB/T2994--94 Y
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