| 摘要 |
PURPOSE:To prepare a collector capable of collecting uranium, etc. in the sea water by treating the bark of pinaceous plant with nitric acid. CONSTITUTION:The bark of pinaceous plant is dried in the air to 10-20% water content, and then crushed to 12-48 mesh grain size in a crusher. The grains of the bark are heated under ordinary pressure at refluxing temp. for 5-60min with 1,000ml 1-5% HNO3 soln. per 100g bark grain and 3-15% formalin basing on the weight of the bark grain. The treated product is washed with water sufficiently and then dried to prepare the adsorbent.
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