MEASUREMENT OF HAZARDOUS COMPONENTS OF DAREX PROCESS OFF-GAS
The hydrogen in the off-gas from batch Darex dissolutions of 304L stainless steel in refluxing nitric--hydrochloric acid mixtures where the hydrogen ion concentration wss constant at 7 M (20 cc of acid per gram of stainless steel) increased from about 0.15 vol% in 2 M HCl to 2 vol% in 6 M HCl. In 2 and 3 M HCl the hydrogen concentration was maximum, 0.35 to O.5 vol%, when 30 to 50% of the total dissolving time had elapsed. In 6 M HCl the hydrogen concentration remained in the 1.5 to 3.5 vol% range throughout the dissolution. The maximum nitrous oxide content of the off-gas increased from 0.7 to 10 vol% as the hydrochloric acid concentration was increased from 2 to 6 M. With a smaller volume of 5 M HNO/sub 3/-2 M HCl the hydrogen content of the off-gas decreased and the nitrous oxide content inrelased. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-15-018131
- OSTI ID:
- 4015469
- Report Number(s):
- ORNL-3022
- Country of Publication:
- United States
- Language:
- English
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