1. A method for recovering iodine, which comprises:
feeding (a) an iodine-containing solution containing iodine, an iodine compound, or a mixture thereof, and (b) at least one solution selected from the group consisting of a basic alkali metal compound solution and a basic alkaline earth metal compound solution separately to a roasting furnace, without premixing (a) and (b), through a different pipeline and from a different feed opening;
burning a combustible material so as to provide a heat treatment in said roasting furnace; and
absorbing a component obtained by said heat treatment with water or an aqueous solution.
2. The method for recovering iodine according to claim 1, wherein said iodine-containing solution is at least one member selected from the group consisting of an organic iodine-containing solution, an acidic iodine-containing solution, and a basic iodine-containing solution.
3. The method for recovering iodine according to claim 1, wherein said (b) at least one solution selected from the group consisting of the basic alkali metal compound solution and the basic alkaline earth metal compound solution is a solution comprising at least one member selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, calcium hydroxide and barium hydroxide.
4. The method for recovering iodine according to claim 1, which comprises controlling amounts of the basic iodine-containing solution or (b) at least one solution selected from the group consisting of the basic alkali metal compound solution and the basic alkaline earth metal compound solution as an alkaline component to be fed to the roasting furnace so that pH of the aqueous solution absorbing the component obtained by the heat treatment becomes 4 or more.
5. The method for recovering iodine according to claim 1, wherein pH of the aqueous solution absorbing the component obtained by the heat treatment is 4 or more.
6. The method for recovering iodine according to claim 1, wherein one member selected from the group consisting of heavy oil, light oil, kerosene, naphtha, natural gas, liquefied petroleum gas, methanol and a mixture thereof is fed as a combustion fuel for the roasting furnace.
7. The method for recovering iodine according to claim 1, wherein both of the combustion and the iodine recovery are continuously carried out by removing some parts of said aqueous solution to outside of the system, while shortage of said aqueous solution is offset by adding fresh water instead in order to maintain specific gravity of the aqueous solution in a range from 1.0 to 1.3.
8. The method for recovering iodine according to claim 1, wherein at least one iodine-containing solution and further (b) at least one solution selected from the group consisting of the basic alkali metal compound solution and the basic alkaline earth metal compound solution, if necessary, are fed to the roasting furnace, which is maintained at a temperature of 800\xb0 C. or higher by combusting the combustion fuel.
9. The method for recovering iodine according to claim 1, wherein by the heat treatment in the roasting furnace, an iodine component is immobilized to a stable iodine salt with the alkali metal or the alkaline earth metal in at least one solution selected from the group consisting of the basic alkali metal compound solution, the basic alkaline earth metal compound solution and the basic iodine-containing solution.
10. The method for recovering iodine according to claim 1, wherein (1) a fractionally recovered organic iodine-containing solution, (2) a fractionally recovered acidic iodine-containing solution, (3) a fractionally recovered basic iodine-containing solution, and (4) at least one solution selected from the group consisting of the basic alkali metal compound solution and the basic alkaline earth metal compound solution are each fed in a mist state by spraying using spraying air, combustion air, or a mixture thereof into the roasting furnace.
11. The method for recovering iodine according to claim 1, wherein said iodine-containing solution is in a liquid state as it is when the iodine-containing material containing iodine or iodine compound is in a state of solution, and in a dissolved state in a solvent when the iodine-containing material containing iodine or iodine compound is in a state of solid.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for drive management and data placement in an archival storage system which includes a set of drives, said method comprising:
mapping a plurality of redundant data stripes onto the set of drives;
selecting a first active data stripe from the plurality of redundant data stripes, the first active data stripe being located on a first subset of the set of drives;
placing the first subset into a first power state;
placing a second subset of the set of drives into a second power state, the second power state being a lower power state than the first power state; and
writing a first set of data to the first active data stripe, when the first active data stripe contains an amount of data that is smaller than a maximum data capacity value of the first active data stripe, selecting a second active data stripe from the plurality of redundant data stripes, the second active data stripe being located on a third subset of the set of drives, the third subset including at least one drive of the second subset, wherein the selected second active data stripe is selected via implementation of an algorithm, and is selected based upon degree of overlap between the second active data stripe and the first active data stripe for promoting increased power efficiency of the archival storage system.
2. A method as claimed in claim 1, further comprising:
placing the at least one drive of the second subset into the first power state.
3. A method as claimed in claim 2, further comprising:
reserving a cache area on the third subset.
4. A method as claimed in claim 3, further comprising:
providing a copy of a portion of the first set of data of the first active data stripe to the cache area on the third subset.
5. A method as claimed in claim 4, further comprising:
placing at least one drive of the first subset into the second power state.
6. A method as claimed in claim 5, further comprising:
writing a second set of data to the second active data stripe.
7. A method as claimed in claim 6, further comprising:
receiving a read request, the read request requesting data segments included in the copy of the data portion stored in the cache.
8. A method as claimed in claim 7, further comprising:
retrieving the requested data segments from the copy of the data portion stored in the cache area and providing the retrieved requested data segments responsive to said read request via transmission over a network.
9. A method as claimed in claim 1, wherein the selected second active data stripe is selected via implementation of Controlled Replication Under Scalable Hashing.
10. An archival storage system, comprising:
a set of disk drives;
means for mapping a plurality of redundant data stripes onto the set of drives;
means for selecting a first active data stripe from the plurality of redundant data stripes, the first active data stripe being located on a first subset of the set of drives;
means for placing the first subset into a first power state;
means for placing a second subset of the set of drives into a second power state, the second power state being a lower power state than the first power state;
means for writing data to the first active data stripe on the first subset; and
when at least a portion of the data has been written to the first active data stripe and the portion of the data is smaller than a maximum data capacity value of the first active data stripe, implementing Controlled Replication Under Scalable Hashing to select a second active data stripe from the plurality of redundant data stripes, the second active data stripe being located on a third subset of the set of drives, the third subset including at least one drive of the second subset, wherein the system implements Massive Array of Independent Disks techniques for drive management and implements Controlled Replication Under Scalable Hashing for data placement.