Method for removing heavy metals from aqueous solutions by coprecipitation
This patent describes a method for removing heavy metal ions from an aqueous solution containing heavy metal ions and ferrous ions. It comprises: adding ferrous ions to the solution so as to increase the molar ratio of ferrous ions to heavy metal ions; rapidly oxidizing in a reaction zone essentially all ferrous ions in the solution to ferric ions while controlling the pH of the solution with added base so as to rapidly form a substantially completely amorphous precipitate comprising a substantial proportion of ferric hydroxide and a substantial proportion of the heavy metal ions; and separating the amorphous precipitate from the solution so as to form an effluent solution have a reduced concentration of heavy metal ions.
- Assignee:
- Union Oil Co. of California, Los Angeles, CA (USA)
- Patent Number(s):
- US 5013453; A
- Application Number:
- PPN: US 7-42565
- OSTI ID:
- 5055029
- Resource Relation:
- Patent File Date: 16 Apr 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CADMIUM
COPRECIPITATION
CHROMIUM
HEAVY IONS
SEPARATION PROCESSES
LEAD
NICKEL
AQUEOUS SOLUTIONS
CHEMICAL REACTION KINETICS
COPPER
MATERIALS RECOVERY
RECYCLING
ZINC
CHARGED PARTICLES
DISPERSIONS
ELEMENTS
IONS
KINETICS
MANAGEMENT
METALS
MIXTURES
PRECIPITATION
PROCESSING
REACTION KINETICS
RECOVERY
SOLUTIONS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
400105* - Separation Procedures
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
400201 - Chemical & Physicochemical Properties