知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

168 条记录 (耗时 0.015 秒)

    Phosphatic and nitrogen fertilizers via HNO.sub.3 processing
    2.
    发明授权
    Phosphatic and nitrogen fertilizers via HNO.sub.3 processing 失效
    通过HNO3处理磷肥和氮肥

    公开(公告)号：US5098461A

    公开(公告)日：1992-03-24

    申请号：US458022

    申请日：1989-12-28

    申请人： Jack M. Sullivan ,  John H. Grinstead, Jr.

    发明人： Jack M. Sullivan ,  John H. Grinstead, Jr.

    IPC分类号： C05B3/00 ,  C05B11/06

    CPC分类号： C05B3/00 ,  C05B11/06

    摘要： A process for producing high-analysis dicalcium phosphate containing phosphatic fertilizers and by-product calcium nitrate. It comprises reacting phosphate rock with nitric acid, followed by pyrolysis of the resulting acidulate to effect liberation of approximately one-half of the initially consumed nitric acid. Recycling of this liberated nitric acid allows production of available phosphate with approximately one-half the acid equivalents normally consumed during sulfuric acid processing. The calcium nitrate in the resulting pyrolyzate is separated from the phosphatic constituent by dissolution in water followed by filtration. Depending upon the initial HNO.sub.3 :CaO acidulation ratio, the available phosphate content of the resulting solid phosphatic fertilizers is high enough (48% P.sub.2 O.sub.5) to allow their use either for bulk blending with nitrogen and potash salts to produce complete grade fertilizers or for direct application as a phosphate nutrient. The resulting calcium nitrate stream may be processed to produce a variety of solid or fluid nitrogen fertilizer products. No "throw away" by-products (other than possibly siliceous gangue) are produced.

    摘要翻译： 一种生产高分析磷酸二钙和副产品硝酸钙的方法。 它包括使磷酸盐岩与硝酸反应，然后热解得到的酸化物，以释放大约一半的初始消耗的硝酸。 回收这种释放的硝酸允许生产可用的磷酸盐，其硫酸处理期间通常消耗的酸当量的约一半。 所得热解物中的硝酸钙通过溶解在水中而与磷酸盐成分分离，然后过滤。 根据最初的HNO3：CaO酸化比例，得到的固体磷酸盐肥料的可用磷酸盐含量足够高（48％P 2 O 5），以允许其与氮气和钾盐大量混合使用以产生完整的等级肥料或直接施用 作为磷酸盐营养。 所得到的硝酸钙流可以被加工以产生各种固体或流体氮肥产品。 副产品（不可能是硅质ang石）不产生。