| 摘要 |
PROBLEM TO BE SOLVED: To provide a device which can surely reduce oxidizing materials. SOLUTION: A treating tank 7 is provided with a chemicals injecting means 1 for injecting a reducer, an underwater pump 2 for jetting water, a mixing nozzle 3 which is connected with the chemicals injecting means and the underwater pump and simultaneously jets the reducer and water and a reaction tube 4 through which the reducer and the water jetted from the mixing nozzle 3 pass as turbulence. It is desirable that the reducer is at least one kind selected from the group composed of sodium hydrogensulfite, sodium sulfite, sodium thiosulfate, L-ascorbic acid, salts of L-ascorbic acid, gaseous sulfur dioxide and a mixture of gaseous sulfur dioxide and sodium sulfite.
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