Cradle to Gate
Identity ID
7c05cf12-7cd1-476b-8572-e3a236063f0e
Materials
Associated ID
e650f1f0-61ce-4365-813f-e05c9e2dfd7f
Included activities starts
Included activities ends
Description
This dataset represents a life cycle inventory (cradle-to-gate) for the process starting from dry coal beneficiation to the production of cleaned thermal coal, covering all activities associated with coal washing, but excluding conditions external to the coal preparation plant (such as raw coal mining and the use of Clean coal), as well as direct or indirect greenhouse gas emissions from employees' commuting and routine office operations during the coal washing process. Based on national standards such as "Cleaner Production Standard for the Coal Mining and Washing Industry" (HJ 446-2008) and "Pollutant Emission Standards for the Coal Industry", the dataset was compiled from multiple data sources and is representative of the average level in Ningxia.
Activity Description
This dataset describes dry coal beneficiation as a coal separation method that utilizes the separation of coal and 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 beneficiation:
1. Preparation of Raw Coal
Coal Crushing and Screening:
Raw coal is crushed by a crusher into particles suitable for dry coal beneficiation, typically with a particle size ranging from 0.5 mm to 50 mm. The crushed coal then enters screening equipment for size classification, ensuring uniform particle size during the beneficiation process.
2. Dry Separation
Wind Separation:
Uses wind separators (such as air dense medium separators, wind separation tables, etc.) for separation. Wind separation utilizes differences in air flow velocity and pressure to separate coal from impurities based on density and particle size.
Vibratory Separation:
Employs vibrating screens or vibratory separators, leveraging the combined action of vibrational force and air flow to separate coal from impurities. Vibrating screens are suitable for separating coarser particles.
Electrostatic Separation:
Uses electrostatic separators to separate coal from impurities based on differences in electrical conductivity within an electric field. Electrostatic separation is suitable for fine particle size coal processing.
3. Clean coal processing
Clean coal collection:
After wind separation, vibration separation, or electrostatic separation, clean coal is collected into dedicated collection devices. After separation from impurities, the clean coal requires further processing to ensure its quality and suitability.
Dusting treatment:
The coal fines generated during dry coal beneficiation must be removed via dust removal equipment (such as bag filters, electrostatic precipitators, etc.) to ensure air quality and reduce dust pollution. Impurity and tailings management
Impurity discharge:
Impurities and tailings separated during the dry coal beneficiation process are discharged through outlets and transported to the tailings management area for treatment.
Tailings storage:
Separated tailings must be properly stored to prevent secondary pollution. Wind and dust control measures should be implemented in the tailings storage area to minimize environmental impact.
5. Environmental Protection and Safety Measures
Dust Control:
dry cleaning processes generate significant amounts of dust, which requires dust control through dust collection equipment. Commonly used equipment includes baghouse filters and electrostatic precipitators.
Noise Control:
Coal preparation equipment generates noise during operation, necessitating noise reduction measures such as the installation of mufflers and sound insulation enclosures to ensure a safe working environment for personnel.
Environmental Monitoring:
Regular monitoring of the environment surrounding the coal preparation plant is essential to ensure that the environmental impacts of the coal preparation process remain within regulatory limits.
Process Description
The main types of Ningxia thermal coal are anthracite and non-caking coal, with coal quality characterized by ash content of 5.01–16.42%, volatile matter of 7.72–36.52%, total sulfur of 0.2–0.79%, and gross as-received low heating value (Qnet,ar) of 6500–8558 kcal/kg.
Time period
2022
2026
Geography
China,Ningxia Hui Autonomous Region
Geography comment
Forming Ningxia's average data through the integration of 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.