Resources Contact Us Home
Method for treating iron in a silver recovery process

Image Number 2 for United States Patent #8114189.

A method of reducing or preventing the amount of iron sludge or precipitate that forms as a result of the recovery of silver from chemical solutions, such as a standard photographic solution. The method generally involves the introduction of a source of a conjugate organic base, such as a weak organic acid like citric acid or a salt of the conjugate organic base like a citrate salt, to the chemical fluid either before or during the silver recovery process. Preferably the source of conjugate organic base is introduced by combining it with a binder to form a time release cake or placing it in a container that has a semipermeable membrane that maintains the concentration of the conjugate organic base in the chemical fluid from about 0.2 to about 78 milimolar over a period of time.

  Recently Added Patents
Vacuum switch and electrode assembly therefor
Non-visual presentation of information on an electronic wireless device
Photoconductor cartridge
Global alignment for high-dynamic range image generation
Burner grate
Semiconductor memory device
Deadline-driven parallel execution of queries
  Randomly Featured Patents
Printed transparent blister sheet
Genetic markers associated with interferon-alpha response
Magneto-optical medium and reproducing device for the same
Master cylinder lever with variable dead band and variable reach adjustment independent of the dead band adjustment
Substituted pteridines
System for estimating bladder volume
Low memory auto-focus and exposure system for large multi-frame image acquisition
System for detecting, diagnosing, and treating cardiovascular disease
Rolling shutter element
Collateral damage coverage