Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iib metal
Reexamination Certificate
2011-06-21
2011-06-21
Bos, Steven (Department: 1736)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iib metal
C423S102000, C423S109000, C423S140000, C423S141000, C423S142000, C423S150100, C423S566100, C423S561100
Reexamination Certificate
active
07964165
ABSTRACT:
The separation method for zinc sulfide, in the hydrometallurgical process by a High Pressure Acid Leach for nickel oxide ore comprising leaching and solid/liquid separation step, neutralization step, zinc removal step, and nickel recovery step, which can inhibit clogging of a filter cloth and reduce a frequency of washing operation and replacement operation of a filter cloth by improving filtration performance of zinc sulfide, and inhibit decrease of nickel recovery ratio, in the zinc removal step in which zinc sulfide is formed by adding a sulfurizing agent to the neutralization final liquid containing zinc as well as nickel and cobalt and zinc sulfide is separated to obtain a mother liquid for nickel recovery containing nickel and cobalt.The separation method for zinc sulfide of the present invention is characterized in that in the above-described neutralization step, the leach residue is added to the leach liquor, and pH of the neutralization final liquid is adjusted so as to fall to the range from 3.0 to 3.5, and in the zinc removal step, the suspended solid comprising the neutralized precipitate and the leaching reside are kept remained in said neutralization final liquid so that turbidity thereof falls in the range from 100 to 400 NTU.
REFERENCES:
patent: 4049770 (1977-09-01), Swinkels et al.
patent: 7563421 (2009-07-01), Kobayashi et al.
patent: 2005/0265910 (2005-12-01), Kobayashi et al.
patent: 06-116660 (1994-04-01), None
patent: 2005-350766 (2005-12-01), None
Matsumoto Satoshi
Nakai Osamu
Ooishi Takao
Ozaki Yoshitomo
Shibayama Keisuke
Bos Steven
Edwards Angell Palmer & & Dodge LLP
Sumitomo Metal & Mining Co., Ltd.
LandOfFree
Separation method for zinc sulfide does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Separation method for zinc sulfide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Separation method for zinc sulfide will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2696426