GB/T 8727-2008Method for determination of coking value of coal pitch products (English PDF)

Foreword

This standard replaces GB/T 8727-1988 "Determination of coking value of coal tar." This standard and GB/T 8727-1988 compared to the main changes are as follows.

--- Modify the "scope";

--- Added "normative references";

--- Improve the "Test Procedure." The standard proposed by China Iron and Steel Association.

1 Scope

This standard specifies the principles of the coal tar products of coking value measurement method and preparation, equipment and materials, test procedure, the specimen knot If calculated, precision and the like.

This standard applies to coal tar processing of the obtained coal tar pitch, modified pitch coking measured values.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 2000 coking products solid sampling methods

GB/T 6003.1 woven wire mesh screen test

3 PRINCIPLE OF THE METHOD

A certain amount of the sample into the 550 °C ± 10 °C temperature heating furnace, and then weighed cinder, cinder amount of content that is the amount of sample A coking value.

4 Samples and preparation

According to the provisions of GB/T 2000 to take samples, grinding with a mortar drying (50 °C ± 2 °C in blast oven drying 1h) by post to GB/T 6003.1 in Ø200 × 50-0.25/0.16 sieve.

5 Apparatus and materials

5.1 porcelain crucible. the volume of 20mL, the inner diameter Ø35mm, high 30mm, with cover.

Volume of 100mL, the inner diameter Ø58mm, high 50mm, with cover.

5.4 Crucible frame. nickel-chromium Sijia made, the size of the hole a crucible holder press into a crucible from the bottom of the crucible bottom 5mm prevail.

5.5 Balance. a sense of the amount of 0.0001g.

5.6 Coke. particle size of 1mm ~ 3mm.

5.2 Box-shaped high-temperature furnace. can control 550 °C ± 10 °C

6 Test procedure

6.1 Weigh the sample 1g (accurate to 0.0002g), placed in a clean good 20mL constant weight porcelain crucible flattening at 550 °C ± 10 °C, Close the lid.

6.2 The sample is loaded into the crucible in advance Fitted with 10mm ± 1mm thick coke 100mL of crucible coke and then the two crucibles To fill the gap between 20mL crucible was completely buried, covered with a lid outside the crucible.

6.3 packed crucible on nickel-chromium wire bracket, and then put the whole temperature box furnace temperature of 550 °C ± 10 °C, 10min within Return to a constant temperature.