Title:
複合硫化物鉱床、尾鉱、粉砕鉱石又は鉱山スラッジからの亜鉛の選択的浸出回収
Document Type and Number:
Japanese Patent JP2013542321
Kind Code:
A
Abstract:
Zinc and lead are usually concomitantly present in Zn—Pb ores and tailings. A novel non-polluting hydrometallurgical process for selectively leaching and recovering zinc (Zn) from a composite lead (Pb) and zinc sulphide containing mineral, crushed untreated rock or unconsolidated mineral particles, mill tailings and/or agglomerated or unagglomerated sulphidic zinc containing waste material without necessitating smelting and refining operation has been developed. A combination of selected oxidant and alkali metal hydroxide has been found effective. A leachant consisting of e.g. a mixture of sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl) is employed to selectively dissolve zinc sulphide at high pH at standard temperature and pressure (STP). The kinetics of leaching along with the effect of varying concentration (preferably of sodium hydroxide and sodium hypochlorite) were systematically investigated. Feed ore containing diverse set of minerals e.g. sulphides and carbonates can also be conveniently treated to selectively and almost quantitatively recover zinc as high purity zinc carbonate. This technology can be employed either in-situ or ex-situ based on the amenability of a particular type of mineral deposit or feed ore.
Inventors:
Madhab Dahal
Application Number:
JP2013530501A
Publication Date:
November 21, 2013
Filing Date:
September 30, 2011
Export Citation:
Assignee:
Yaba Technologies, Inc.
International Classes:
C22B19/20; C22B3/04; C22B3/44; C22B13/00
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Satoshi Deno
Masatoshi Takahashi
Nagi Kokubo
Takashi Ishida
Tetsuji Koga
Satoshi Deno
Masatoshi Takahashi
Nagi Kokubo