HS/T 77-2023 in English
VALIDIdentification method of calcium bentonite and sodium bentonite
- Issued on:2023-12-11
- Implemented on:2024-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$175.00
Introduction
Background of Standard Formulation and Technical Evolution
As the first special identification specification for bentonite in the customs system, this standard fills the technical gap in the classification and identification of mineral raw materials. Compared with the early industry practices, the current version mainly strengthens the detection requirements of X-ray diffractometer and ion chromatograph.
Comparison of core identification indicators
| Detection dimension | Calcium bentonite | Sodium bentonite | Detection equipment |
|---|---|---|---|
| Cation exchange capacity | 50-90 mmol/100g | 80-120 mmol/100g | Atomic absorption spectrometer |
| Swelling capacity | 4-15 mL/g | 20-30 mL/g | Centrifugal sedimentation instrument |
Key Detection Technology Description
X-ray diffraction analysis requires the use of a CuKα radiation source, with a scanning speed controlled at 2°/min, and special attention paid to the identification differences between the 17.7Å and 12.5Å characteristic peaks.
Typical case: In 2023, Changsha Customs detected a batch of goods declared as sodium-based bentonite, but the actual montmorillonite interlayer spacing was only 14.2Å, and it was finally confirmed to be a calcium-based modified product.
Enterprise implementation suggestions
- It is recommended to purchase a scanning electron microscope with energy dispersive spectrometer to assist in microscopic morphology analysis
- Establish a standard sample comparison library, including at least 5 typical mining area samples
- The test report must also record the environmental temperature and humidity parameters
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