silver recovery

Question 1

• Valuable substance that can be
  reclaimed from the fixer solution.
• It is also a polluting agent and must not
  bellowed to flow into a normal drainage

Answer 1

silver

Question 2

• Process used to harvest the silver from the photographic processing solutions
• Done in different ways depending on:
  A. The size of your operation
  B. The concentration of silver in your
  effluent
  C. The silver discharge limits

Answer 2

silver recovery

Question 3

methods

Answer 3

chemical recovery cartridge
electrolytic method
chemical precipitation techniques

Question 4

• Most common and economic method
• It uses a cartridge through which the
  fixer can pass.
• Inside the cartridge is a canister with
  iron in the form of very fine steel wool or
  heavy fine screen mesh
• Used by small volume users.
• Use in a small volume of patients.

Answer 4

CHEMICAL RECOVERY CARTRIDGE

Question 5

• Most efficient technique
• It uses an electric cathode, with an
  immersed negative charge, in a canister containing a positive charge.

Answer 5

ELECTROLYTIC METHOD

Question 6

• Technique which can used to produce very low silver concentrations in the effluent going to the sewer
• Until recently, precipitation has not been as widely used as a silver-recovery technique.
• Common precipitating agents classically have been alkali metal salts of sulfide (sodium, sulfide, potassium sulfide, etc) which will form silver sulfide in solution; the silver sulfide is removed by filtration.

Answer 6

CHEMICAL PRECIPITATION TECHNIQUES