Cradle to Gate
Identity ID
1707f47e-0db5-41f6-a7e2-f887dec5fb73
Materials
Associated ID
e650f1f0-61ce-4365-813f-e05c9e2dfd7f
Included activities starts
Included activities ends
Description
This dataset represents the life cycle inventory (cradle-to-gate) of thermal coal products starting from dry coal beneficiation to the production of Clean coal, covering all coal washing and preparation activities. However, it does not include external activities beyond the coal preparation plant (e.g., raw coal mining, utilization of Clean coal), or direct and indirect greenhouse gas emissions arising from personnel commuting and daily office operations during the coal preparation process. The dataset, compiled from multiple data sources, complies with national standards such as the "Cleaner Production Standard for Coal Mining and Washing Industry" (HJ 446-2008) and the "Emission Standards for Pollutants from the Coal Industry," and is representative of the average production level in Guizhou.
Activity Description
This dataset describes dry coal cleaning as a coal beneficiation method that separates coal from impurities in an air medium, primarily suitable for water-scarce regions and areas with high requirements for water resource protection. Below is an overall description and introduction of the entire production process of dry coal cleaning:
1. Raw Coal Preparation
Coal Crushing and Screening:
Raw coal is crushed by a crusher into particles suitable for dry coal cleaning, typically ranging in size from 0.5 mm to 50 mm. The crushed coal then enters screening equipment for particle size classification, ensuring uniform particle size during the coal cleaning process.
2. Dry Separation
Wind Separation:
Uses wind separators (such as air dense-medium separators, wind sorting tables, etc.) to separate materials. Wind separation relies on the velocity and pressure differential of airflow to separate coal from impurities based on density and particle size.
Vibration Separation:
Employs vibrating screens or vibrating separators, using the combined effect of vibrational force and airflow to separate coal from impurities. Vibrating screens are suitable for coarse particle separation.
Electrostatic Separation:
Utilizes electrostatic separators to separate coal from impurities based on differences in electrical conductivity within an electric field. Electrostatic separation is suitable for fine-grained coal processing.
3. Clean coal processing
Clean coal collection:
After wind sorting, vibration sorting, or electrostatic sorting, clean coal is collected into dedicated collection devices. Once separated from impurities, the clean coal requires further processing to ensure its quality and suitability.
Dedusting treatment:
The coal dust generated during the dry coal beneficiation process must be removed using dust removal equipment (such as bag filters, electrostatic precipitators, etc.) to ensure air quality and reduce dust pollution. Impurity and Tailings Management
Impurity Discharge:
The impurities and tailings separated during the dry coal beneficiation process are discharged through outlets and transported to the tailings treatment area for processing.
Tailings Storage:
The separated tailings must be stored appropriately to prevent secondary pollution. Dust and wind control measures should be implemented in the tailings storage area to minimize environmental impact.
5. Environmental Protection and Safety Measures
Dust Control:
Dry coal beneficiation processes generate a significant amount of dust, requiring dust collection equipment for effective dust control. Commonly used dust collectors include bag filters and electrostatic precipitators.
Noise Control:
Coal beneficiation equipment produces noise during operation, necessitating noise reduction measures such as installing silencers and sound insulation enclosures to ensure a safe working environment for operators.
Environmental Monitoring:
Regular monitoring of the surrounding environment of the coal preparation plant is conducted to ensure that environmental impacts from the beneficiation process are maintained within regulatory limits.
Process Description
In Guizhou Province, the main types of bituminous coal are lean coal and anthracite, with coal quality characteristics as follows: ash content 5.96–16.97%, volatile matter 4.72–14.16%, total sulfur 0.36–5.94%, carbon content 88.01–91.01%, and as-received net calorific value (Qnet,ar) ranging from 6848 to 8659 kcal/kg.
Time period
2022
2026
Geography
China,Guizhou
Geography comment
Forming Guizhou's average data through merging data from multiple sources.
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
Dry coal beneficiation is an efficient and environmentally friendly coal processing method that separates coal from impurities using physical means such as air flow, vibration, and electrostatic forces. The production process includes coal crushing and screening, air separation, vibratory separation, electrostatic separation, clean coal collection, dedusting treatment, and the handling of impurities and tailings. This dry beneficiation technology features water conservation, environmental friendliness, strong adaptability, and simple operation, making it widely applicable in coal processing in water-scarce regions and in operations with high environmental protection requirements.