GB/T 16417-2011Method for evaluating the washability of coal (English PDF)

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules.

This standard replaces GB/T 16417-1996 "coal washability assessment methods." This standard compared with GB/T 16417-1996, the main changes are as follows.

--- Remove the normative references in "GB 7186-87 PREPARATION terminology" (Chapter 2 of the 1996 edition);

--- Appendix A to the informative annex (see Appendix A);

--- The A3 in "Appendix A" to "Appendix C", delete "optional curve plotted on graph paper 200mm x 200mm" (see The 1996 edition of Appendix A);

--- In Appendix A of the ash, heavy gangue, low-density material value, said after the decimal point to two significant figures (see Appendix A);

--- Remove A4.2.2 title "final value" (see the 1996 edition of Appendix A). The standard proposed by China Coal Industry Association.

This standard coal by the National Standardization Technical Committee (SAC/TC42) centralized.

1 Scope

This standard specifies the method for evaluating coal washability, naming and division level.

This standard applies to coal grain size larger than 0.5mm.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 478 coal drifting Test Method

MT/T 320 coal core samples of coal washability test methods

3 Evaluation Method

3.1 evaluating coal washability a "separation density ± 0.1 Content Act" (referred to as "delta ± 0.1 Content Law").

3.2 drifting test shall comply with GB/T 478 or MT/T 320's.

3.3 delta ± 0.1 content is calculated.

a) delta ± 0.1 content according to the theoretical separation density calculation;

b) the theory of separation density in an optional curve is determined (accurate to two decimal places) specified coal ash;

C) When the theoretical separation density less than 1.70g/cm3, Shen deduction Refuse ( > 2.00g/cm3) 100% calculated delta ± 0.1 content; Li On the separation density equal to or greater than 1.70g/cm3, the deduction Low Density (< 1.50g/cm3) 100% calculated delta ± 0.1 content;

d) delta ± 0.1 content expressed as a percentage, the calculation result after rounding to one decimal place.

3.4 evaluating coal washability may refer to Appendix A of.

4 Rating naming and classification

According to the degree of difficulty sorting the coal washability divided into five grades, each grade name and delta ± 0.1 content shown in Table 1.

Table 1 The classification of coal washability

delta ± 0.1 content /% Optional Level

<=10.0 easy to choose

10.1 to 20.0 moderate optional

20.1 to 30.0 is more difficult to choose

30.1 to 40.0 Refractory

> 40.0 extremely difficult election