GB/T 3286.8-2014Method for chemical analysis of limestone and dolomite—Part 8: The determination of loss on ignition—The gravimetric method (English PDF)

Foreword

GB/T 3286 "Method for chemical analysis of limestone and dolomite" is divided into nine parts.

- Part 1: The determination of calcium oxide and magnesium oxide content - The complexometric titration method and the flame atomic absorption spectrometric method;

- Part 2: The determination of silicon dioxide content - The silicomolybdic blue spectrophotometric method and the perchloric acid dehydration gravimetric method - Part 3: The determination of aluminum oxide content - The chrome azurol S spectrophotometric method and the complexometric titration method - Part 4: The determination of iron oxide content - The o-phenanthroline spectrophotometric method and the flame atomic absorption spectrometric method;

- Part 5: The determination of manganese oxide content - The periodate oxidation spectrophotometric method - Part 6: The determination of phosphorus content - The phosphomolybdate blue spectrophotometric method - Part 7: The determination of sulfur content - The pipe furnace combustion iodic acid potassium titration method, the high frequency combustion with infrared absorption method and the barium sulfate gravimetric method - Part 8: The determination of loss on ignition - The gravimetric method - Part 9: The determination of carbon dioxide content - The caustic asbestos absorption gravimetric method This part is Part 8 of GB/T 3286.

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

This part replaces GB/T 3286.8-1998 "Chemical analysis of limestone and dolomite - The molybdenum blue photometric method for determination of phosphorus".

Compared with GB/T 3286.8-1998, the main technical changes in this part are as follows.

- CHANGE the standard name to "Method for chemical analysis of limestone and dolomite - Part 8: The determination of loss on ignition - The gravimetric method";

- In the normative references, CANCEL the reference standard year number, and ADD some references;

- CONDUCT a common test of precision between laboratories; USE the repeatability limit r and the reproducibility limit R obtained by statistics to replace the "allowable difference";

- MODIFY some textual expressions.

1 Scope

This part of GB/T 3286 specifies the gravimetric method to determine the loss on ignition.

This part applies to the determination of loss on ignition in limestone and dolomite; it also applies to the determination of loss on ignition in metallurgical lime.

2 Normative references

The following documents are essential to the application of 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) are applicable to this standard.

GB/T 2007.2 General rules for the sampling and sample preparation of minerals in bulk. Sample preparation by manual method

GB/T 6379.2 Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method

3 Principles

The sample is placed in a platinum crucible; the temperature is gradually increased to 1050 °C ± 50 °C in a high temperature furnace to burn it to a constant mass. The reduced mass is the loss on ignition.

4 Instruments

In the analysis, only the usual laboratory instruments and equipment are used.

5 Sample preparation

6 Analytical procedures

7 Calculation and expression of analytical results

8 Precision

9 Test report

The test report shall include the following.