Semi-siliceous insulating refractory brick

1 Scope

This standard specifies the terminology and definitions, grades and shape dimensions, technical requirements, test methods, quality evaluation procedures, packaging, marking, transportation, storage and quality certificates of semi-siliceous insulating refractory bricks.

This standard applies to semi-siliceous insulating refractory bricks used in the insulation layer of industrial kilns or the working layer in direct contact with flames.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, , Only the dated version applies to this document. For undated reference documents, , The latest version ( Including all amendments ) Applies to this document.

GB/T 2992.1   Shape and size of refractory bricks   Part 1 Part : General bricks

GB/T 2998 Test methods for bulk density and apparent porosity of shaped insulating refractory products

GB/T 5072 Test method for compressive strength of refractory materials at room temperature

GB/T 5988 Test method for permanent linear change of refractory materials after heating

GB/T 6900 Chemical analysis methods for aluminum silicate refractory materials

GB/T 7321 Methods for preparing test samples of shaped refractory products

GB/T 10325 Rules for acceptance sampling inspection of shaped refractory products

GB/T 10326 Inspection methods for dimensions, appearance and section of shaped refractory products

GB/T 16546 General provisions for packaging, marking, transportation, storage and quality certificates of shaped refractory materials

GB/T 21114 Refractory materials X X-ray fluorescence spectrometry   Molten glass chip method

YB/T 4130 Test method for thermal conductivity of refractory materials ( Water flow plate method )

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Insulating semi-siliceous refractory brick

Refers to a silicoaluminous refractory material with an alumina content of 15% to 30%, made from pyrophyllite as the main raw material, through molding and firing.

4 Grades and shape dimensions

4.1 Semi-siliceous insulating refractory bricks are divided into four grades: BGGR-0.6, BGGR-1.0, BGGR-1.2, and BGGR-1.5, according to their physicochemical properties. Among them, B, G, G, and R are the initials of "ban" (half), "gui" (silicon), "ge" (insulating), and "re" (heat) in pinyin, respectively, and the number after them represents the bulk density of the semi-siliceous insulating refractory brick.

4.2 The shape and dimensions of semi-siliceous insulating refractory bricks shall be in accordance with GB/T 2992.1. Products with special specifications can be produced according to the drawings of the demander.

5 Technical requirements

5.1 The physicochemical indicators of semi-siliceous insulating refractory bricks shall conform to the provisions in Table 1.

5.2 The dimensions and appearance of the bricks shall conform to the provisions in Table 2.

5.3 Other special requirements shall be negotiated by both the supplier and the demander.

6 Test methods

6.1 Sample preparation shall be carried out according to GB/T 7321.

6.2 Determination of chemical composition shall be carried out according to GB/T 6900 or GB/T 21114.

6.3 Determination of bulk density shall be carried out according to GB/T 2998.

6.4 Determination of permanent linear change after heating shall be carried out according to GB/T 5988.

6.5 Determination of compressive strength at room temperature shall be carried out according to GB/T 5072.

6.6 Determination of thermal conductivity shall be carried out according to YB/T 4130.

6.7 Inspection of appearance, dimensions and section shall be carried out according to GB/T 10326.

7 Quality assessment procedures

7.1 Batching

Products shall be batched according to the same grade, and each batch shall not exceed 30t.

7.2 Sampling and acceptance criteria

Sampling and acceptance of products shall be carried out according to GB/T 10325. Chemical composition, bulk density, room temperature compressive strength, and permanent linear change after heating are the acceptance inspection items.

7.3 Form of qualification assessment

Qualification assessment can be carried out in the form of supplier's declaration, user's determination or third-party certification.

8 Packaging, marking, transportation, storage and quality certificate

8.1 Packaging, marking, transportation and storage of products shall be carried out according to GB/T 16546, and special cases shall be agreed upon separately by both the supplier and the demander.

8.2 When the product is shipped, a quality certificate issued by the quality supervision department of the supplier shall be attached, stating: supplier's name, demander's name, shipping date, contract number, product name, grade, brick number, execution standard number and physical and chemical index test results, etc.

Insulating semi-silicious refractory brick

1 Range

This standard specifies the terms and definitions, grades and shapes, technical requirements, test methods, quality assessment procedures, packaging, marking, transportation, storage and quality certificates of semi-silicon heat-insulating firebricks.

This standard applies to semi-silicic insulating firebricks for thermal furnace insulation or working layers in direct contact with flames.

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.

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

Test method for bulk density and true porosity of GB/T 2998 shaped heat-insulating 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 General requirements for packaging, marking, transport, storage and quality certificates for shaped refractory materials

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

Test method for thermal conductivity of YB/T 4130 Refractories (Water flow plate method)

3Terms and definitions

The following terms and definitions apply to this document.

3.1Insulating semi-silicious refractory brick

It is a silica-alumina refractory with pyrophyllite as the main raw material, and the alumina content is between 15% and 30%.

4 grade and shape size

4.1 Semi-silicone-insulated firebrick is divided into four grades BGR-0.6 BGR-1.0, BGR-1.2 and BGR-1.5 according to physical and chemical indexes. Where B.G,G,R are the Chinese pinyin initial letters of “half”, “silicon”, “insulation” and “heat” respectively, and the numbers behind are the volume density of semi-silicon heat-insulating refractory bricks.

4.2 The shape and size of semi-silicon heat insulation firebrick shall be carried out according to GB/T 2992.1, and the products with special specifications can be produced according to the drawing of the demand side.

5 Technical Requirements

5.1 The physical and chemical indexes of semi-siliceous heat-insulating firebricks shall conform to the provisions of Table 1.

5.2 The size and appearance of the bricks shall comply with the provisions of Table 2.

5.3 Other special requirements shall be negotiated by both parties.

6 Test methods

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

6.2 Chemical composition shall be determined according to GB/T 6900 or GB/T 21114.

6.3 The bulk density was measured according to GB/T 2998.

6.4 The determination of permanent linear change of heating was carried out according to GB/T 5988.

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

6.6 Thermal conductivity was measured according to YB/T 4130.

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

7 Quality assessment procedures

7.1 Batch

Products should be grouped according to the same brand, each batch does not exceed 30t.

7.2 Rules for sampling and conformity determination

Sampling and acceptance of products are carried out in accordance with GB/T 10325. Chemical composition, bulk density, normal temperature compressive strength, heating permanent linear changes are the acceptance test items.

7.3 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.

8 Packing, marking, transportation, storage and quality certificate

8.1 The packaging, marking, transportation and storage of the product shall be carried out in accordance with GB/T 16546, and special circumstances shall be separately agreed by the supply and demand parties.

8.2 When the products are issued, the quality certificate issued by the quality supervision department of the supplier shall be attached, indicating the name of the supplier, the name of the demander, the date of delivery, the contract number, the name of the product, the brand number, the brick number, the implementation standard number and the test result of the physical and chemical index.