利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

29 条记录 (耗时 0.011 秒)

    Process for recovering aluminum from alunite
    23.
    发明授权
    Process for recovering aluminum from alunite 失效
    从铝酸钠中回收铝的工艺

    公开(公告)号：US4057611A

    公开(公告)日：1977-11-08

    申请号：US801744

    申请日：1977-05-31

    申请人： Larry D. Jennings ,  Wayne W. Hazen

    发明人： Larry D. Jennings ,  Wayne W. Hazen

    IPC分类号： C01F7/06 ,  C01F7/02

    CPC分类号： C01F7/0686

    摘要： An improvement in the process for the recovery of aluminum from alunite in which the alunite in particulate form is dehydrated, sulfur and alkali metal compounds removed from the dehydrated ore leaving a particulate residue containing aluminum values, the residue digested with at least one alkali metal hydroxide to convert the aluminum values to soluble aluminates, silicon removed from the soluble aluminate solution, and aluminum values precipitated from the aluminate solution, the improvement comprising: multiple stage digestion of the particulate residue accomplished by dividing the particulate residue into two fractions, digesting one fraction first and using the first stage liquor from the first digestion step to digest the remaining fraction. The fraction digested first may be the one having the smaller particle size, or the one having the larger particle size. The objective is to contact the caustic digestion liquor at its lowest aluminum content (lowest A/C ratio) with that fraction of the residue having the highest extractable aluminum content. The result is the production of a liquor for final recovery of aluminum values which has a higher aluminum to caustic ratio than that produced by prior digestion procedures. The improvement provides a higher recovery of aluminum from the alunite ore.

    摘要翻译： 从其中脱水的颗粒形式的褐煤矿的铝酸钠回收铝的方法的改进，从脱水矿石中除去硫和碱金属化合物，留下含有铝的颗粒残渣，残余物用至少一种碱金属氢氧化物 将铝值转化成可溶性铝酸盐，从可溶性铝酸盐溶液中除去的硅和从铝酸盐溶液中析出的铝值，其改进包括：通过将颗粒残余物分成两部分来消化颗粒残留物进行多级消化，消化一个馏分 首先使用来自第一消化步骤的第一级液体来消化剩余部分。 首先消化的馏分可以是具有较小粒度的馏分，或具有较大颗粒尺寸的馏分。 目的是以最低铝含量（最低A / C比）与苛性碱消解液接触，其中残余物中可提取铝含量最高的部分。 结果是生产一种最终回收铝值的液体，其具有比先前消化程序产生的更高的铝与苛性碱比。 该改进提供了从铝酸钙矿石中更高的铝回收率。

    Production of monobasic potassium phosphate by ion exchange
    24.
    发明授权
    Production of monobasic potassium phosphate by ion exchange 失效
    通过离子交换生产磷酸二氢钾

    公开(公告)号：US4008307A

    公开(公告)日：1977-02-15

    申请号：US582807

    申请日：1975-06-02

    申请人： Kent W. Loest ,  Vernon R. Ewing

    发明人： Kent W. Loest ,  Vernon R. Ewing

    IPC分类号： B01J39/00 ,  C01B25/30 ,  C01F7/06 ,  C01B15/16 ,  C01B25/26 ,  C01F1/00 ,  C01F7/02

    CPC分类号： C01B25/303 ,  B01J39/00 ,  C01F7/0686

    摘要： A process for the production of monobasic potassium phosphate from wet process phosphoric acid and potassium sulfate by ion exchange. The application of the process is the production of monobasic potassium phosphate by ion exchange from wet phosphoric acid produced by the reaction of sulfuric acid on apatite rock and by-product potassium sulfate from processes for the recovery of aluminum from alunite.

    摘要翻译： 通过离子交换从湿法磷酸和硫酸钾生产磷酸二氢钾的方法。 该方法的应用是通过硫酸从磷灰石和副产物硫酸钾的反应产生的湿磷酸离子交换生产磷酸二氢钾从从铝酸钠回收铝的方法。

    Process for recovering aluminum from alunite
    25.
    发明授权
    Process for recovering aluminum from alunite 失效
    从铝酸钠中回收铝的工艺

    公开(公告)号：US3996334A

    公开(公告)日：1976-12-07

    申请号：US582806

    申请日：1975-06-02

    申请人： George J. Hartman ,  Vernon R. Ewing

    发明人： George J. Hartman ,  Vernon R. Ewing

    IPC分类号： C01F7/02 ,  B01J39/02 ,  B01J39/04 ,  B01J41/04 ,  C01D5/00 ,  C01F7/06

    CPC分类号： B01J41/043 ,  B01J39/02 ,  B01J39/043 ,  C01D5/008 ,  C01F7/0686

    摘要： An improvement in processes for recovering aluminum from alunite ore which processes include roasting the ore to remove water of hydration, removing sulfur and potassium compounds from the roasted ore by a procedure including a final leaching step resulting in a residue and a solution containing potassium sulfate, effecting partial recovery of potassium sulfate from the solution by crystallization with some potassium sulfate being bled off from the mother liquor, converting aluminum values in the residue to alkali metal aluminates by digesting the residue with alkali metal hydroxide including a substantial amount of sodium hydroxide, removing silicon from the alkali metal aluminates leaving a waste desilication product, recovering aluminum values from the desilicated aluminates by precipitation, circulating the mother liquor from the precipitation step to digestion as contaminated sodium hydroxide is bled off, the improvement which comprises enhancing the economics of the overall process by introducing therein an ion exchange procedure in which potassium hydroxide for the first leaching step is produced through ion exchange by use of potassium sulfate and sodium hydroxide, a further improvement being the use of the desilication product as the ion exchange agent.

    摘要翻译： 从铝酸钙矿石中回收铝的方法的改进包括焙烧矿石以除去水合水，通过包括残留物的最终浸出步骤和含有硫酸钾的溶液的方法从焙烧的矿石中除去硫和钾化合物， 通过用母液中的一些硫酸钾结晶从溶液中部分地回收硫酸钾，通过用包括大量氢氧化钠的碱金属氢氧化物将残留物消化，将残余物中的铝转化成碱金属铝酸盐，除去 来自碱金属铝酸盐的硅离开废弃的脱硅产物，通过沉淀从脱铝的铝酸盐中回收铝的值，将母液从沉淀步骤循环到被污染的氢氧化钠的消解中，其改进包括提高整体的经济性 过程 通过在其中引入离子交换方法，其中通过使用硫酸钾和氢氧化钠通过离子交换产生用于第一浸出步骤的氢氧化钾，进一步改进的是使用脱硅产物作为离子交换剂。