GB/T 32840-2016 in English

1. Background and significance of the standard

GB/T32840-2016 Gold Ore is an important standard for my country's gold industry, aiming to unify the classification, quality requirements and testing methods of gold ores. The standard was proposed by the National Gold Standardization Technical Committee and formulated in combination with the characteristics of my country's gold ores and market demand to ensure that product quality meets national safety production and environmental protection requirements.

2. Comparison of standard frameworks

3. Interpretation of the core content of the standard

3.1 Classification and grading

Gold ore can be divided into two categories according to its origin: domestic and imported. It can be divided into six types according to the process, including heap leaching type and easy-to-treat cyanidation type. Each type is further divided into grades according to its chemical composition (see Table 1). The degree of difficulty is determined based on the direct cyanide gold leaching rate:

• Mild: ≥30%
• Medium: <30%
• Severe: <10%

3.2 Chemical composition requirements

Domestic gold ore must meet the gold grade specified in Table 1, and imported ore should focus on controlling the content of harmful elements (mercury, arsenic, etc.) (see Table 2). Chemical analysis methods refer to GB/T20899.

3.3 Particle size and moisture

The maximum particle size of domestic ore is ≤350mm, and that of imported ore is ≤20mm. The moisture content must be ≤14% to ensure safe transportation and storage.

4. Implementation Suggestions

4.2 Quality Control

• Establish a sound quality management system and clarify the responsible persons in each link
• Strengthen the frequency of testing of chemical composition and harmful elements
• Optimize ore processing technology and reduce secondary pollution

4.3 Standard Promotion and Training

It is recommended to organize standard learning and technical exchanges regularly to ensure that relevant personnel are familiar with the requirements of GB/T32840-2016. Focus on training on chemical analysis and particle size detection methods.