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JC/T 848.1-2010 PDF English

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JC/T 848.1-2010: Alumina grinding ball
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JC/T 848.1: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
JC/T 848.1-2010230 Add to Cart Auto, 9 seconds. Alumina grinding ball Valid
JC/T 848.1-1999199 Add to Cart 2 days Alumina grinding ball Obsolete

Similar standards

JC/T 932   GB/T 27979   JC/T 867   JC/T 642   

JC/T 848.1-2010: Alumina grinding ball

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JCT848.1-2010
JC BUILDING MATERIAL INDUSTRY STANDARD ICS 81.060 Q 32 Record No.. 30028-2011 Replacing JC/T 848.1-1999 Alumina Grinding Ball 耐磨氧化铝球 Issued on: NOVEMBER 22, 2010 Implemented on: MARCH 1, 2011 Issued by. Ministry of Industry and Information Technology of the People’s Republic of China

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 5 4 Classification and Specification... 6 5 Requirements... 7 6 Test Methods... 9 7 Inspection Rules... 10 8 Marking, Packaging, Transportation, and Storage... 11 Appendix A (Normative) Test Methods on the Impact Resistance, and Wear and Tear of Alumina Grinding Balls... 13 Alumina Grinding Ball

1 Scope

This Standard specifies the terms and definitions, classification, specifications, requirements, test methods, inspection rules, as well as marking, packaging, transportation, and storage for alumina grinding balls. This Standard applies to alumina grinding balls with an alumina content of no less than 70%.

2 Normative References

The provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 2997-2000 Test Method for Bulk Density, Apparent Porosity and True Porosity of Dense Shaped Refractory Products GB/T 6900.9-2006 Chemical Analysis of Alumina-silica Refractories - Determination of Alumina GB/T 6900.10-2006 Chemical Analysis of Alumina-silica Refractories - Determination of Iron Oxide GB/T 8488.5-2001 Acid-resistant bricks - Test methods - Water absorption test EN 101-1991 Ceramic tiles - Determination of scratch hardness of surface according to Mohs

3 Terms and Definitions

For the purposes of this Document, the following terms and definitions apply. 3.1 Pressing model ball Alumina grinding ball that is formed by cold isostatic pressing. 3.2 Rolling ball Alumina grinding ball that is formed by rolling. 3.3 Hat edge The forming marks on the surface of the alumina grinding ball during cold isostatic pressing. 3.4 Radial size The maximum diameter of the ball measured parallel to the ball cap of the pressing model ball. 3.5 Latitudinal size The maximum diameter of the ball measured perpendicular to the ball cap of the pressing model ball. 3.6 Ball degree The ratio of the difference between the radial size and the latitudinal size of the pressing model ball to the specification size. 3.7 Wear and tear The mass loss of alumina grinding ball after grinding with water in a polyurethane tank for a certain period of time.

4 Classification and Specification

4.1 Classification Alumina grinding ball is classified according to the following method. 4.1.1 It can be classified into pressing model ball and rolling ball according to the forming method. 4.1.2 The alumina content is classified into 70 series, 90 series, 92 series, 95 series, 99 series; it can also generate other series as per the agreement. 4.1.3 It can be classified into large ball ϕ ≥ 20mm and small ball ϕ < 20mm according to the specification size. 4.2 Specification The common specification of the alumina grinding ball is as follows. 4.2.1 Pressing model ball. ϕ 20mm, ϕ 25mm, ϕ 30mm, ϕ 35mm, ϕ 40mm, ϕ 45mm, ϕ 50mm, ϕ 60mm, ϕ 70mm, ϕ 80mm; it can also generate other specifications as per the agreement. 4.2.2 Rolling ball. ϕ 2mm, ϕ 6mm, ϕ 8mm, ϕ 10mm, ϕ 13mm, ϕ 20mm, ϕ 25mm, ϕ 30mm, ϕ 40mm, ϕ 50mm, ϕ 60mm; it can also generate other specifications as per the agreement.

5 Requirements

5.1 Apparent quality The apparent quality of the alumina grinding ball shall comply with the provisions of Table 1. 5.2 Apparent size and deviation 5.2.1 The apparent size and deviation of pressing model ball shall conform to the provisions of Table 2. 5.2.2 The apparent size and deviation of rolling ball shall conform to the provisions of Table 3. Table 3 – Apparent size and deviation of rolling ball Unit. mm 5.2.3 The ball degree requirements for pressing model ball shall comply with the provisions of Table 4.

6 Test Methods

6.1 Appearance quality inspection For appearance quality inspection, randomly select 10 balls from a 25 kg of sample and inspect them using a vernier caliper with an accuracy of 0.02 mm. 6.2 Appearance size and deviation inspection For appearance size inspection, take 10 balls that have passed the appearance quality inspection and measure them using a vernier caliper with an accuracy of 0.02 mm. For rolling balls, measure their diameters in two perpendicular directions. For pressing model balls, measure their radial size and latitudinal size; and take the arithmetic mean of the diameters. The appearance size and deviation shall comply with the provisions of Tables 2 and 3. 6.3 Ball degree inspection 10 pressing model balls that have passed the appearance quality inspection and size deviation inspection shall be measured using a vernier caliper with an accuracy of 0.02 mm. Each ball shall measure its radial size and latitudinal size, as well as the ratio of the difference between the radial and latitudinal sizes to the specification size. 6.4 Determination of water absorption Take balls that have passed the appearance quality inspection, size deviation inspection, and ball degree inspection. Take 3 large balls or 3 groups of large balls (each group weighing approximately 100 g); and 3 groups of small balls (each group weighing approximately 100 g). Test water absorption according to the test methods specified in Clause 5 of GB/T 8488-2001. 6.5 Determination of bulk density Take balls that have passed the appearance quality inspection, size deviation inspection, and ball degree inspection. Take 3 large balls or 3 groups of large balls (each group weighing approximately 100 g), and 3 groups of small balls (each group weighing approximately 100 g). Test bulk density according to the method specified in GB/T 2997-2000. 6.6 Determination of alumina content Conduct the test in accordance with Clause 9, “Determination of Alumina”, of GB/T 6900-2006 6.7 Determination of ferric oxide content Conduct the test in accordance with Clause 10, “Determination of Iron Oxide”, of GB/T 6900- 2006. 6.8 Impact resistance, and wear and tear tests ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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