GB/T 6730.29-2016Iron ores - Determination of barium content - Barium sulfate grarimetric method (English PDF)

1 Scope

This part of GB/T 6730 specifies the method for the determination of barium content in barite by barium sulfate gravimetric method.

This part is applicable to the determination of barium content in iron ore, iron concentrate, sinter and pellet. Measurement range (mass fraction). 0.50% ~

45.0%.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article

Pieces. For undated references, the latest edition (including all modifications) applies to this document.

GB/T 6379.1 Accuracy of measurement methods and results (accuracy and precision) - Part 1. General and definitions

GB/T 6379.2 Accuracy of measurement methods and results (accuracy and precision) - Part 2. Determination of standard measurement methods

The basic method of sex and reproducibility

GB/T 6682 Analytical laboratory water specifications and test methods

Preparation of pre - dried samples for analysis of iron ore GB/T 6730.1

Representation and Judgment of Numerical Correction Rule and Limit Value of GB/T 8170

GB/T 10322.1 Iron Ore Sampling and Sample Preparation

GB/T 12806 laboratory glass instrument single standard line capacity bottle

GB/T 12808 Laboratory glass instruments Single line suction pipette

3 principle

The sample is decomposed with hydrochloric acid, hydrofluoric acid and nitric acid, and barium sulfate is precipitated in the presence of sulfuric acid, separated from most of the interfering elements.

Potassium pyrophosphate melting, dilute sulfuric acid leaching, so that barium sulfate and barium sulfate precipitation and rare earth acid insoluble matter separation; with sodium carbonate - potassium carbonate melting sulfur

Barium sulfate precipitation barium carbonate precipitation, dissolved in hydrochloric acid after the lead strontium separation and barium secondary precipitation. When the lead in the sample is greater than 0.05%,

Hydrogen sulfide lead sulfide and barium separation; when the strontium is greater than 0.02%, the use of chromate barium barium chromate and strontium separation, barium high when the need for chromic acid

Barium is converted to barium carbonate to separate chrome. In the hydrochloric acid medium, adding sulfuric acid to barium barium sulfate precipitation, filtration, washing, ashing, at 800 °C

Burning to constant weight, weighing and calculating the barium content of the sample.

4 Reagents and Materials

Unless otherwise stated, only the reagents identified as analytical reagents and those of Class 3 and Grade 3 in accordance with GB/T 6682 are used in the analysis.

Water or deionized water or water equivalent to its purity.