Study of the precipitation of platinum from dilute aqueous solution
Hydrogen sulfide gas was used to precipitate platinum sulfide from a dilute aqueous platinum solution. The precipitation was carried out in a continuous mixed suspension mixed product removal (CMSMPR) precipitator. The platinum sulfide precipitate formed a stable colloidal suspension. The average particle size was about 7 nm. A mathematical model based on a steady-state particle population balance which relates the particle size distribution to nucleation and growth kinetics and operating parameters did not predict the observed size distributions. A qualitative model based on the Brownian motion of the particles and their electrostatic interactions is proposed to explain the observed size distributions. Addition of electrolytes to the colloidal suspension of platinum sulfide caused the particles to flocculate and form large, easily-filtered particles. The higher the cation valence, the more effective it was as a flocculating agent.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5962377
- Report Number(s):
- IS-T-1187; ON: DE85009232
- Resource Relation:
- Other Information: Thesis. Submitted to Iowa State University
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
PLATINUM
MATERIALS RECOVERY
PLATINUM SULFIDES
PRECIPITATION
AQUEOUS SOLUTIONS
FLOCCULATION
HYDROGEN SULFIDES
KINETICS
PARTICLE SIZE
CHALCOGENIDES
DISPERSIONS
ELEMENTS
HYDROGEN COMPOUNDS
MANAGEMENT
METALS
MIXTURES
PLATINUM COMPOUNDS
PLATINUM METALS
PROCESSING
RECOVERY
SEPARATION PROCESSES
SIZE
SOLUTIONS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
400105 - Separation Procedures