Precipitation of iron, sodium, and potassium impurities from synthetic solutions modeling spent acid streams from a chemical coal cleaning process

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Fuel Science and Technology International; (USA)

DOI:https://doi.org/10.1080/08843759008915956· OSTI ID:6934066

Norton, G A; Richardson, R G; Markuszewski, R ^[1]; Levine, A D ^[2]

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1. Ames Lab., IA (USA)
2. Iowa State Univ. of Science and Technology, Ames, IA (USA). Dept. of Civil Engineering

This paper presents experiments on treating model spent acid streams from a chemical coal cleaning process by double salt precipitation which indicated that simple heating of solutions containing Fe{sub 2}(SO{sub 4}){sub 3}, Na{sub 2}SO{sub 4}, and K{sub 2}SO{sub 4} caused jarosite (KFe{sub 3}(SO{sub 4}){sub 2}(OH){sub 6}) to form preferentially to natrojarosite (NaFe{sub 3}(SO{sub 4}){sub 2}(OH){sub 6}), and precipitate yields were higher than when Na{sub 2}SO{sub 4} was the only alkali sulfate present. Virtually all of the K, about 90% of the Fe, and about 30% of the SO{sub 4}{sup 2 {minus}} could be precipitated at 95{degrees}C, while little or no Na was removed. However, simply heating Fe{sub 2}(SO{sub 4}){sub 3}/Na{sub 2}SO{sub 4} solution up to 95{degrees}C for {lt}12 hours did not produce adequate precipitate yields. When Na was the only alkali metal present, the Fe concentration in the solution had to be increased to avoid formation of undesirable iron compounds.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6934066
• Journal Information: Fuel Science and Technology International; (USA), Journal Name: Fuel Science and Technology International; (USA) Vol. 8:7; ISSN FSCTE; ISSN 0884-3759
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATES
CHEMICAL REACTION YIELD
CLEANING
COAL
COAL PREPARATION PLANTS
ENERGY SOURCES
FMC DOUBLE ALKALI PROCESS
FOSSIL FUELS
FUELS
IMPURITIES
INDUSTRIAL PLANTS
IRON COMPOUNDS
IRON SULFATES
MATERIALS
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM SULFATES
REMOVAL
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFUR COMPOUNDS
SYNTHETIC FUELS
TRANSITION ELEMENT COMPOUNDS
YIELDS