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以硫酸（０．８～１．０ ｍ ｏｌ／Ｌ）硫酸铵（１．０～１．５ ｍ ｏｌ／Ｌ）为淋洗剂，采用多分步淋洗技术，在普通的固定床淋洗柱（Φ８．０ ｍ ｍ ）中对不同铀容量的２０１×７ 树脂（４３～１１８ ｍ ｇ／ｇ）进行试验。结果表明，淋洗体积仅１．５～２．５ ＢＶ①，合格淋洗液铀质量浓度达１５～２９ ｇ／Ｌ，总淋洗体积为１６～２１ ＢＶ，淋洗时间小于３５ ｈ。该淋洗合格液可先用干的粉状碳酸钙中和沉淀法去除硫酸，然后滤液用氨水沉淀铀，即两步沉淀法。所获ＡＤＵ 产品为一级品
With sulfuric acid (0.8 ~ 1.0 m ol / L) ammonium sulfate (1.0 ~ 1.5 m ol / L) as eluent, using multi-step rinsing technology, In the column (Φ8.0 m m), 201 × 7 resins (43 ~ 118 m g / g) with different uranium capacities were tested. The results showed that the elution volume was only 1.5-2.5 BV①, the eluent concentration of uranium was 15-29 g / L, the total elution volume was 16-21 BV and the elution time was less than 35 h. The rinsing qualified liquid can be dried with powdered calcium carbonate and precipitation method to remove sulfuric acid, and then the filtrate precipitated with ammonia uranium, that is, two-step precipitation. ADU products obtained for the first grade