Coal Upgrading
From Open Source Ecology
Basics
- A Process by which Lower Grade Coals are "Upgraded" to a Product Functionally Identical to Higher Grade Coals
- Can be done via washing, drying/pyrolysis, and briquetting/pelletising
- The main goal is to reduce Ash Content and increase the Heating Value
- Due to Fossil Fuels obviously not being part of OSE's Strategy, this page is intended as a place to have information on this technolgy placed for reference in developing the Charcoal Fuels Workflow especially in regards to Ultra Pure Charcoal Fuel
Methods
Washing
- A Patent Titled "Process for preparing ultra-pure coal by using acid-alkali method" (Seems to be lab scale though? Odd and some potential translation issues, but interesting nonetheless)
- A 2001 Study Titled "The production of ultra clean coal by chemical demineralisation" (Uses Nitric Acid ...after Aqueous Hydrofluoric Acid So nasty stuff, did get from sh content of approximately 7.9% by weight and a sulphur content of 2.6% by weight to an ash content of 0.6% and Sulfur Content of 1.4%
- A 2020 Study Titled "Ultra clean coal production by microwave irradiation pretreatment and sequential leaching with HF followed by HNO3" (Initial ash contents from two sites of 8.31% and 10.36%, respectively to 0.39% and 0.69%)
- Quote:
- "Ultra Clean Coal (UCC) is defined as a coal that is washed using conventional methods, ground into fine particles, and then chemically treated to remove ash so that the final ash content of the coal is less than 1%. UCC has various potential uses, such as serving as the carbon source for the silicon smelting industry [2]; replacing oil for the production of aromatic chemicals and materials [2]; producing a coal slurry fuel that can be used to replace oil combustion in diesel engines [3], [4], [5], [6], [7]; producing activated carbon used in filters for water and air purification; producing carbon fiber that is an extremely strong reinforcement material used in construction [8]; fabricating carbon anodes to replace petroleum coke [2]; and serving as the fuel for advanced power generation technologies, such as direct firing in gas turbines [9]."
- A 2023 Study Titled "Study on preparation of ultra-clean coal from bituminous coal using the ionic liquid extraction"
- A 2011 Study Titled "Generation of ultra-clean coal from Victorian brown coal — Sequential and single leaching at room temperature to elucidate the elution of individual inorganic elements"
- A 2022 Study Titled "Production of Ultra-Clean Coal by the Combined Method of Grinding and Collector Gasification Flotation"
- Interesting terms that lead to other rabbit holes:
- A 2023 Study Titled "Study on Preparation of Ultra-Clean Coal Based on Ionic Liquid"
- A 2014 Study Titled "ULTRA CLEAN COAL PRODUCTION USING DENSE MEDIUM SEPARATION FOR THE SILICON MARKET"
- A 2015 Study Titled "COAL PREPARATION TECHNOLOGY: STATUS AND DEVELOPMENT IN CHINA"
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