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本文研究了从盐酸(当地产最便宜的酸)酸化磷酸盐矿石得到磷酸副产品中回收铀、钒和氟的方法。将铁粉加入浸出系统,在氧化还原电位180—200毫伏、温度90℃条件下,得到少量铀和钒的沉淀物。在850℃下加盐焙烧该沉淀物,生成水溶性钒酸钠,然后,用水浸除去钒,留下铀的残渣。在氧化还原电位480毫伏条件下,用碳酸钠选择性浸出铀,然后,通过碱分解制备出重铀酸钠浓缩物。氟是在酸浸过程中通过加入化学计量的岩盐或碳酸钠,使其呈氟硅酸钠形式加以回收的。
This paper studies the recovery of uranium, vanadium and fluorine from phosphoric acid by-products by acidifying phosphate ore from hydrochloric acid (the cheapest acid in the industry). Iron powder was added to the leaching system to obtain a small amount of uranium and vanadium precipitates at a redox potential of 180-200 mV and a temperature of 90C. The precipitate was salt-roasted at 850 ° C to produce water-soluble sodium vanadate, which was then stripped of vanadium to leave uranium residue. Uranium is selectively leached with sodium carbonate at a potential of 480 mV at the redox potential, and then, sodium uranate concentrate is prepared by alkali decomposition. Fluorine is recovered in the form of sodium fluorosilicate by adding stoichiometric rock salt or sodium carbonate during acid leaching.