Gas injection apparatus and method having application to gold leaching
First Claim
1. A gas injection apparatus for injecting a gas into a liquid comprising:
- a baffle plate having an outer peripheral region;
a discharge nozzle to discharge at least said liquid;
said discharge nozzle oriented normally to said baffle plate so that a fluid stream composed of at least said liquid is directed against said plate and produces an oppositely directed flow, towards said outer peripheral regions of said baffle plate;
said oppositely directed flow having a sheet-like turbulent flow regime located adjacent to said plate and means forming a circulating flow regime located above said turbulent flow regime; and
means for mixing said gas into said liquid so that smaller bubbles are entrained in said turbulent flow regime and are discharged with said liquid flowing in said turbulent flow regime from said outer peripheral region of said baffle plate and larger bubbles float into said circulating flow regime to break up into said smaller bubbles to be entrained in said turbulent flow regime.
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Accused Products
Abstract
A gas injection apparatus for injecting a gas into a liquid comprising a baffle plate, a re-circulation chamber, and a discharge nozzle. The discharge nozzle is oriented normally to the baffle plate so that a liquid stream composed of the liquid is directed against the baffle plate and produces an oppositely directed flow towards the outer peripheral edge of the baffle plate. The oppositely directed flow has a sheet-like turbulent flow regime located adjacent to the plate and a circulating flow regime located above the turbulent flow regime and bounded by a re-circulation chamber. The gas is mixed into the liquid so that smaller bubbles are entrained in the turbulent flow regime and are discharged with the liquid flowing in the turbulent flow regime from the outer peripheral edge of the baffle plate. Larger bubbles flow into the circulating flow regime to break up into smaller bubbles which are entrained in the turbulent flow regime swept out of the apparatus. The apparatus is particularly useful in a gold leaching process in which the gold slurry is thickened to produce clarified water. Oxygen is injected into the clarified water and thereafter, the clarified water is injected into a leaching tank.
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Citations
9 Claims
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1. A gas injection apparatus for injecting a gas into a liquid comprising:
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a baffle plate having an outer peripheral region; a discharge nozzle to discharge at least said liquid; said discharge nozzle oriented normally to said baffle plate so that a fluid stream composed of at least said liquid is directed against said plate and produces an oppositely directed flow, towards said outer peripheral regions of said baffle plate; said oppositely directed flow having a sheet-like turbulent flow regime located adjacent to said plate and means forming a circulating flow regime located above said turbulent flow regime; and means for mixing said gas into said liquid so that smaller bubbles are entrained in said turbulent flow regime and are discharged with said liquid flowing in said turbulent flow regime from said outer peripheral region of said baffle plate and larger bubbles float into said circulating flow regime to break up into said smaller bubbles to be entrained in said turbulent flow regime. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of injecting a gas into a liquid comprising:
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discharging a fluid stream composed of at least said liquid against a baffle plate having at least one outer peripheral edge to produce an oppositely directed flow, having a flow direction towards said at least one outer peripheral edge of said baffle plate; said oppositely directed flow having a sheet-like turbulent flow regime located adjacent to said plate and a circulating flow regime located above said turbulent flow regime; and mixing said gas into said liquid so that smaller bubbles are entrained in said turbulent flow regime and are discharged with said liquid flowing in said turbulent flow regime from an outer peripheral edge of said baffle plate and larger bubbles float into said circulating flow regime to break up into said smaller bubbles to be entrained in said turbulent flow regime. - View Dependent Claims (8, 9)
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Specification