GB/T 7702.3-2008Test method for granular activated carbon from coal -- Determination of hardness (English PDF)

Foreword

GB/T 7702 "Test Method for Granular Activated Carbon from Coal" is divided into.

— Part 1.Determination of Moisture;

— Part 2.Determination of Particle Size;

— Part 3.Determination of Hardness;

— Part 4.Determination of Packing Density;

— Part5.Determination of Absorption of Water;

— Part 6.Determination of Methylene Blue Absorption;

— Part 7.Determination of Iodine Number;

— Part 8.Determination of Phenol Absorption;

— Part 9.Determination of Ignition Temperature;

— Part 10.Determination of Service Life against Benzene and Chloroethane

Vapors;

— Part 13.Determination of CCL4 Vapor Absorption;

— Part14.Determination of Sulphur Capacity;

— Part 15.Determination of Ash Content;

— Part 16.Determination of pH Value;

— Part 17.Determination of Floatation Ratio;

— Part 18.Determination of Caramel Absorption;

— Part 19.Determination of Carbon Tetrachloride (CCl4) Desorption;

— Part 20.Determination of Pore Volume and Specific Surface Area.

This Part is part 3 of GB/T 7702.

This Part modifies and adopts ASTM D 3802.1979 "Standard Test Method for

Ball-Pan Hardness of Activated Carbon" (reconfirmed in 2005). Compared with ASTM

D 3802.1979, the major technical differences are as follows.

a) The volume of sample is adjusted to 50mL;

b) The sample wearing method is changed to ball-milling method;

c) Technical requirements of hardness tester are added.

This Part replaces GB/T 7702.3-1997 "Standard Test Method for Hardness of

Granular Activated Carbon from Coal – Determination of Hardness".

Compared with GB/T 7702.3-1997, the main changes of this Part are as follows.

a) Structure of this standard is adjusted according to GB/T 1.1-2000 "Directives

for Standardization - Part 1.Rules for the Structure and Drafting of Standards"

and GB/T 20001.4-2001 "Rules for Drafting Standards - Part 4.Methods of

Chemical Analysis";

b) This revision combines the ASTM standard ASTM D 3802.1979 "Standard Test

Method for Ball-Pan Hardness of Activated Carbon" (reconfirmed in 2005) with

the actual situation of China.

c) The volume of sample is adjusted to 50mL;

d) The sample wearing method is changed to ball-milling method;

e) Technical requirements of hardness tester are added.

This Part was proposed by and shall be under the jurisdiction of China North

Industries Group Corporation.

Drafting organization of this Part. Shanxi Xinhua Chemicals Co., Ltd.

Chief drafting staffs of this Part. Zhang Xu, Li Weibing, Yuan Yidong, Zhao Honghai,

Zhao Jijun, Chi Guangxiu, and Li Ruomei.

The historical editions replaced by this Part are as follows.

— GB/T 7702.3-1987, and GB/T 7702.3-1997.

Test Method for Granular Activated Carbon from Coal -

Determination of Hardness

1 Scope

This Part specifies the contents such as determination principle, determination

procedure and result calculation of the granular activated carbon from coal.

This Part is applicable to the determination of hardness of granular activated carbon

from coal (hereinafter referred to as activated carbon).

2 Principle

Under specified conditions, the sample is placed in a roller with a number of stainless

steel balls. Through mechanical rotation, the sample is worn. Determine the changing

conditions of the particle size of worn sample. Use the percentage OF the sample

mass retained on the test sieve TO the original sample mass AS the sample

hardness.

3 Instruments and Equipment

4 Sample Preparation

5 Determination Procedure

6 Result Calculation

Hardness is measured by mass fraction w. The value is expressed in % and is

calculated according to Formula (1).

7 Precision

8 Test Report

The test report shall include the following contents.

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