Method for removing pyritic, organic and elemental sulfur from coal
This patent describes a process for removing sulfur and ash from coal and other carbonaceous materials which contain pyritic sulfur, sulfides, elemental sulfur, organic sulfur and/or sulfate sulfur. This method consists of: 1) treating an aqueous slurry of coal or other carbonaceous materials at an elevated temperature below the oxidation temperature of the coal or other carbonaceous materials and in the presence of an oxidizing agent capable of reducing pyritic sulfides to a soluble state with: (a) formulation that consists of one or more alkaline earth metal chlorides, one or more alkali metal chlorides or a mixture of the chlorides, and a treating agent, and an inorganic acid. Provided that if iron is not present in the coal or other carbonaceous material, then ferric chloride is present in the slurry containing in formulation (1) or (b) a formulation that consists of: a hypochlorite or a mixture of hypochlorites, a treating agent, and a mixture of (a) and an inorganic acid. Provided that if iron is not present in the coal or other carbonaceous material ferric chloride is present in the slurry containing the formulation (2). Then all the sulfur extracted from the coal or other carbonaceous material is converted to sulfate sulfur or water soluble sulfurs.
- Assignee:
- NOV; EDB-86-092410
- Patent Number(s):
- US 4569678
- OSTI ID:
- 6006557
- Resource Relation:
- Patent File Date: Filed date 25 May 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
DEASHING
DESULFURIZATION
SULFUR
REMOVAL
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CHLORIDES
COAL PREPARATION
FUEL SLURRIES
ORGANIC SULFUR COMPOUNDS
OXIDATION
PYRITE
SOLUBILITY
SULFATES
TEMPERATURE DEPENDENCE
WATER
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
DISPERSIONS
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
MINERALS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SLURRIES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SUSPENSIONS
TRANSITION ELEMENT COMPOUNDS
010402* - Coal
Lignite
& Peat- Purification & Upgrading
013000 - Coal
Lignite
& Peat- Transport
Handling
& Storage