Chemical cleaning of coal by molten caustic leaching after pretreatment by low-temperature devolatilization

Patent · Tue Aug 22 00:00:00 EDT 1989

OSTI ID:867084

Chriswell, Colin D ^[1]; Kaushik, Surender M ^[2]; Shah, Navin D ^[3]; Markuszewski, Richard ^[4]

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1. Slater, IA
2. Socorro, NM
3. Houston, TX
4. Ames, IA

Pretreatment of coal by devolatization at temperatures ranging from about 420.degree. C. to about 450.degree. C. for from about 10 minutes to about 30 minutes before leaching with molten caustic leads to a significant reduction in carbonate formation, greatly reducing the cost of cleaning coal on a per ton basis.

• Research Organization: Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)
• DOE Contract Number: W-7405-ENG-82
• Assignee: Iowa State University Research Foundation, Inc. (Ames, IA)
• Patent Number(s): US 4859212
• Application Number: 07/244,991
• OSTI ID: 867084
• Country of Publication: United States
• Language: English

Related Subjects

chemical
cleaning
coal
molten
caustic
leaching
pretreatment
low-temperature
devolatilization
devolatization
temperatures
ranging
420
degree
450
10
minutes
30
leads
significant
reduction
carbonate
formation
greatly
reducing
cost
ton
basis
significant reduction
temperatures ranging
molten caustic
greatly reducing
caustic leaching
carbonate formation
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