Nonpolluting recovery of rare earth values from rare earth minerals/ores
    4.
    发明授权
    Nonpolluting recovery of rare earth values from rare earth minerals/ores 失效
    从稀土矿物/矿石中无稀土回收稀土价值

    公开(公告)号:US5011665A

    公开(公告)日:1991-04-30

    申请号:US487926

    申请日:1990-03-05

    IPC分类号: C22B3/04 C01F17/00 C22B59/00

    摘要: Rare earth values are nonpollutingly recovered from a rare earth mineral/ore, especially one containing but minor amounts of the rare earths, by (a) leaching/decomposing such rare earth mineral/ore with a solution of nitric acid to solubilize the rare earth values contained therein, (b) optionally separating insoluble residue from the resulting leach solution, (c) separating the rare earth values from the leach solution, (d) treating the leach solution thus stripped of rare earth values with a hydroxide of a metallic cation M to precipitate solubilized impurities and separating the thus precipitated impurities therefrom, (e) treating the resulting purified solution with sulfuric acid to precipitate metal sulphates and separating the thus precipitated sulfates therefrom to regenerate the above nitric acid solution, and (f) optionally recycling such regenerated solution of nitric acid to the leaching/decomposition step (a).

    摘要翻译: 通过(a)用硝酸溶液浸出/分解稀土矿物/矿石以稀释稀土值,从稀土矿物/矿石,特别是含有少量稀土矿物中稀土稀土矿物质中不稀土回收。 (b)任选地从所得浸出溶液中分离不溶性残渣,(c)从浸出溶液中分离稀土值,(d)用金属阳离子M的氢氧化物处理由此剥离的稀土值的浸出溶液 (e)用硫酸处理得到的纯化溶液以沉淀金属硫酸盐并从中沉淀出沉淀的硫酸盐以再生上述硝酸溶液,和(f)任选地再循环这种再生的 硝酸溶液进行浸出/分解步骤(a)。

    Heavy metal cation recovering agent including a silicate or
aluminosilicate type compound and a carbonate type compound
    6.
    发明授权
    Heavy metal cation recovering agent including a silicate or aluminosilicate type compound and a carbonate type compound 失效
    重金属阳离子回收剂,包括硅酸盐或硅铝酸盐型化合物和碳酸盐型化合物

    公开(公告)号:US5858242A

    公开(公告)日:1999-01-12

    申请号:US737072

    申请日:1997-05-20

    摘要: An agent for recovering heavy metal cations from an aqueous effluent, including a silicate or aluminosilicate type compound, e.g. an alkali metal silicate or aluminosilicate, and a carbonate type compound, e.g. an alkali metal carbonate, and preferably a carrier such as a lay. The agent may also form a cation stabilizer. Said agent is useful for removing or stabilizing heavy metal cations in the water used for cleaning flue gases from waste incineration, particularly household refuse and industrial waste incineration.

    摘要翻译: PCT No.PCT / FR95 / 00557 Sec。 371日期1997年5月20日 102(e)日期1997年5月20日PCT提交1995年4月28日PCT公布。 公开号WO95 / 29875 日期1995年11月9日,用于从含水流出物中回收重金属阳离子的试剂,包括硅酸盐或硅铝酸盐类化合物, 碱金属硅酸盐或硅铝酸盐,和碳酸盐型化合物,例如, 碱金属碳酸盐,优选载体如铺层。 该试剂也可形成阳离子稳定剂。 所述试剂可用于除去或稳定用于清洁废物焚烧,特别是家用垃圾和工业废物焚烧的烟道气的水中的重金属阳离子。

    Recovery of rare earth values from gypsum
    9.
    发明授权
    Recovery of rare earth values from gypsum 失效
    从石膏中回收稀土价值

    公开(公告)号:US5034201A

    公开(公告)日:1991-07-23

    申请号:US583605

    申请日:1990-09-17

    IPC分类号: C01F17/00

    摘要: Rare earth values are recovered from gypsum starting material by (i) dissolving such gypsum in water and separating therefrom the water-insoluble fractions which contain the rare earth elements (ii) treating such insoluble fractions with a solution of carbonate ions, (iii) next digesting the insoluble fractions thus treated with a mineral acid and converting at least the rear earth values into water-soluble salts thereof, and (iv) recovering such rear earth values from the medium of digestion.

    摘要翻译: 通过(i)将石膏溶解在水中并从其中分离含有稀土元素的水不溶性部分(ii)用碳酸根离子溶液处理这些不溶部分,稀土值从石膏原料中回收,(iii)下一步 消化如此用无机酸处理的不溶性级分,并将至少后土值转化成其水溶性盐,和(iv)从消化介质中回收这些后土。