After separation from the undiluted spent acid by filtration the TNA is water- washed and again filtered. ... basis, including 5% reconcentra- tion loss) 2 3, nitric acid (100%) TO, sodium sulphide (60%) 1-0, sulphur (lumps) 0a#39;4 to 0a#39;5 lb. ... production of TNA has been achieved largely by the skill and perseverance of American technical men and operators. ... 3091) when using two equivalents of potassium nitrate and operating in certain conditions, which they found on analysis to be a newanbsp;...
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