ZINC RECOVERY METHOD

WIPO Patent Application WO/2023/157826

A1

A zinc recovery method comprising: an alkaline melting step 102 for bringing, at a temperature equal to or higher than the melting point of sodium hydroxide, a material (1) and the like into contact with molten sodium hydroxide which is sodium hydroxide (5), (14) in a molten state to break up zinc ferrite contained in the material (1) and the like in the molten sodium hydroxide into zinc oxide components and ferric oxide components; a water dissolution step (103) for bringing, into contact with water and at a temperature not higher than the boiling point of water, the ferric oxide components, the zinc oxide components, and sodium hydroxide obtained as a result of lowering the temperature of the molten sodium hydroxide, and dissolving the zinc oxide components into a sodium hydroxide aqueous solution to obtain a zinc-containing aqueous solution (8) containing zinc components and to obtain an insoluble substance (9) including ferric oxide components that would not be dissolved in the sodium hydroxide aqueous solution; and a zinc recovery step (105), (108) for recovering the zinc components derived from the zinc-containing aqueous solution (8).

HAIKI KENJI (JP)
MATSUURA HIROYUKI (JP)
MOTOBA KAZUHIKO (JP)
TOMONAGA SAKIKO (JP)
TAMAI YOSHIE (JP)
MORI SHUJI (JP)

PCT/JP2023/004931

August 24, 2023

February 14, 2023

Click for automatic bibliography generation  

KINOTECH CORP (JP)
UNIV TOKYO (JP)

C22B3/12; C22B19/20; C22B3/44; C22B3/46; C22B19/30

WO2017187973A1

2017-11-02

CN110863219A	2020-03-06
JPS57501384A	1982-08-05
JP2012201901A	2012-10-22
JP2021008385A	2021-01-28
JP2019119895A	2019-07-22

KAWAMOTO Manabu et al. (JP)

View/Download PDF      PDF Help

Previous Patent: COMPUTER PROGRAM AND PROCESSING DEVICE

Next Patent: RUBBER COMPOSITION, VULCANIZATE, AND VULCANIZED MOLDED OBJECT