GB/T 40503-2021 in English
VALIDMeasuring methods of secondary coal slime content in coal preparation plant
- Issued on:2021-08-20
- Implemented on:2022-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 40503-2021选煤厂次生煤泥量的测定方法》由TC42（全国煤炭标准化技术委员会）归口，TC42SC3（全国煤炭标准化技术委员会选煤分会）执行，主管部门为中国煤炭工业协会。
Introduction
Interpretation of the core content of the standard
This standard specifies the method for determining the amount of secondary coal slime in the production process of a coal preparation plant, with a focus on the quantitative analysis of coal slime with a particle size of <0.5mm. The technical framework includes three key modules:
| Determination link | Core indicators | Method basis |
|---|---|---|
| Primary coal slime system | γpr＜0.5 | Formula (1)(2) |
| Total coal slime system | γto＜0.5 | Formula (4) |
| Secondary coal slime system | γse＜0.5 | Formula (5) |
Key technical points
1. Determination principle
The secondary coal slime volume is calculated by the difference method: γse＜0.5 = γto＜0.5 - γpr＜0.5. The total coal slime volume γto＜0.5 requires the comprehensive screening test (GB/T477) and floating test (GB/T478) data.
2. Instrument requirements
- Standard sieve: 0.5mm square hole sieve, in line with GB/T6003.1 requirements
- Drying oven: temperature control accuracy ±2℃
- Electronic balance: range ≥1kg, accuracy 0.001kg
Implementation Notes
Typical Error Control
The application case of a coal preparation plant shows that when the moisture content of the coal sample is greater than 8%, direct screening will result in a coal slime adhesion error of up to 2.3%. Recommended pretreatment process:
- Dry at 50℃ until moisture is less than 5%
- Sieve after natural cooling to room temperature
- Use air jet to assist screening
Data rounding rules
The measurement result is retained to one decimal place. When the second decimal place is:
- Discard when less than 5
- Carry when ≥5
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