GB/T 4984-2023 - Chemical analysis of refractories containning zirconia

Wavelength range: 160-900nm
Detection limit: SiO 2 ≤0.005μg/mL
Stability: RSD＜1.5% (10μg/mL standard solution)

Standard No.: GB/T 4984-2023
Language: Chinese, Available in English version
Release Date: 2023
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 4984-2023
Replace: GB/T 4984-2007

Introduction

Background of Standard Revision and Technological Evolution

GB/T 4984-2023 replaces the 2007 version of the standard. The main technical changes include:

Revision content	2023 version	2007 version
Determination items	Added 6 items including Zr(Hf)O₂	Not included
Instruments and equipment	Added 2 items including Inductively coupled plasma optical emission spectrometer	Not required
Analysis methods	5 new methods including X-ray fluorescence spectrometry	Traditional wet chemical analysis

Content range	Method	Principle	Detection limit
≤10%	Molybdenum blue photometry	Silico-molybdenum heteropoly acid reduction color development	0.01%
5-50%	Weight-molybdenum blue combined method	Hydrofluoric acid volatilization subtraction method	0.1%
10-35%	Silicon molybdenum yellow photometry	Direct comparison method	0.5%

The standard puts forward clear technical indicators for key equipment such as Inductively coupled plasma optical emission spectrometer:

Standard curve verification cycle ≤3 months
When measuring the loss on ignition, the temperature must be strictly controlled at 1050±50℃
When measuring zirconium content, attention should be paid to the safe operation of hydrofluoric acid
It is recommended to use standard substances for process control

$Chemical analysis of refractories containning zirconia$