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    Process for separating and recovering metals
    3.
    发明授权
    Process for separating and recovering metals 有权

    公开(公告)号：US09809870B2

    公开(公告)日：2017-11-07

    申请号：US14452843

    申请日：2014-08-06

    Applicant: Chevron U.S.A. Inc.

    Inventor： Rahul Shankar Bhaduri ,  Louis Joseph Nordrum ,  Alexander E. Kuperman

    IPC: C22B34/34 ,  C22B34/22 ,  C22B3/00 ,  C22B7/00

    CPC classification number: C22B34/345 ,  C22B7/009 ,  C22B23/026 ,  C22B23/0446 ,  C22B34/225 ,  Y02P10/214 ,  Y02P10/224 ,  Y02P10/23 ,  Y02P10/234

    Abstract: A process for treating spent catalyst containing heavy metals, e.g., Group VIB metals and Group VIII metals is provided. In one embodiment after deoiling, the spent catalyst is treated with an ammonia leach solution under conditions sufficient to dissolve the group VIB metal and the Group VIII metal into the leaching solution, forming a leach slurry. After solid-liquid separation to recover a leach solution, chemical precipitation and solids repulping is carried out to obtain an effluent stream containing ammonium sulfate (Amsul), ammonium sulfamate, Group VB, Group VIB and Group VIII metals. Following sulfidation, the Group VIII metal is fully removed and Group VB and Group VI metals are partially removed from the Amsul stream. In the additional steps of oxydrolysis and iron precipitation, an effective amount of ferric ion at a pre-select pH is added to form insoluble complexes with the Group VB and Group VIB metals, which upon liquid-solid separation produces an effluent ammonium sulfate stream containing less than 10 ppm each of the Group VB and Group VIB metals.

    COMPOSITION OF A FILTER CAKE FOR PRECIOUS METALS RECOVERY
    4.
    发明申请
    COMPOSITION OF A FILTER CAKE FOR PRECIOUS METALS RECOVERY 审中-公开
    过滤器用于重金属回收的组合物

    公开(公告)号：US20160289792A1

    公开(公告)日：2016-10-06

    申请号：US15185113

    申请日：2016-06-17

    Applicant: Chevron U.S.A. Inc.

    Inventor： Rahul Shankar Bhaduri ,  Hye Kyung Cho Timken ,  Phillip Ian Cuspard

    IPC: C22B3/00 ,  C22B7/00

    CPC classification number: C22B11/048 ,  B01J19/18 ,  B01J23/96 ,  B01J27/13 ,  B01J27/32 ,  B01J38/10 ,  B01J38/64 ,  B01J38/68 ,  B01J2219/00177 ,  C22B7/009 ,  Y02P10/214

    Abstract: A process is provided for preparing a spent noble metal fixed-bed catalyst for precious metals recovery, comprising: a) adding the catalyst to a caustic solution to wash the spent catalyst and to make a wash slurry having an alkaline pH, wherein the spent catalyst has been in contact with chloroaluminate ionic liquid catalyst, and wherein the spent catalyst comprises from 5 to 35 wt % chloride; and b) filtering the wash slurry and collecting: i) a filter cake having from at least 70 wt % of the chloride in the spent catalyst removed and having the noble metals retained, and ii) a wash filtrate. Also provided is a filter cake comprising a washed consolidated cake having 40 to 75 wt % solids, a cake moisture content from 25 to less than 60 wt %, 0.1 to 1.5 wt % total noble metals, and a residual chloride content of from zero to less than 4 wt %.

    Abstract translation: 提供了一种制备用于贵金属回收的废贵金属固定床催化剂的方法，包括：a）将催化剂加入苛性碱溶液中以洗涤废催化剂并制备具有碱性pH的洗涤浆液，其中废催化剂 已经与氯铝酸盐离子液体催化剂接触，并且其中废催化剂包含5至35重量％的氯化物; 和b）过滤洗涤浆液并收集：i）从除去的废催化剂中除去至少70重量％的氯化物并且保留贵金属的滤饼，和ii）洗涤滤液。 还提供了一种滤饼，其包括洗涤的固结滤饼，其具有40至75重量％的固体，饼状水分含量为25至小于60重量％，总贵金属为0.1至1.5重量％，残留氯含量为0至 小于4重量％。

    METALS RECOVERY FROM SPENT CATALYST
    6.
    发明申请
    METALS RECOVERY FROM SPENT CATALYST 有权

    公开(公告)号：US20220259696A1

    公开(公告)日：2022-08-18

    申请号：US17625444

    申请日：2020-07-08

    Applicant: Chevron U.S.A. Inc.

    Inventor： Rahul Shankar Bhaduri ,  Bruce Edward Reynolds ,  Oleg A. Mironov ,  Alexander Kuperman ,  Woodrow K. Shiflett

    IPC: C22B7/00 ,  C22B34/22 ,  C22B34/34

    Abstract: An improved method for recovering metals from spent catalysts, particularly from spent slurry catalysts, is disclosed. The method and associated processes comprising the method are useful to recover catalyst metals used in the petroleum and chemical processing industries. The method generally involves a pyrometallurgical method and a hydrometallurgical method and includes forming a soda ash calcine of a caustic leach residue of the spent catalyst containing an insoluble Group VIII/Group VIB/Group VB metal compound combined with soda ash, and extracting and recovering soluble Group VIB metal and soluble Group VB metal compounds from the soda ash calcine.

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