Preparation of metal silver powder by directly hydrgen reduction of silver sulfate in alkali water slurry
The present invention relates to a new method for preparing metal silver powder by making silver sulfide undergo the process of direct hydrogen reduction in alkaline slurry. It is mainly characterized by that in the slurry a proper quantity of alkali can be added so as to regulate pH value to about...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | The present invention relates to a new method for preparing metal silver powder by making silver sulfide undergo the process of direct hydrogen reduction in alkaline slurry. It is mainly characterized by that in the slurry a proper quantity of alkali can be added so as to regulate pH value to about 12, at the same time the catalyst Pdcl2 and reduction adjuvant ZnO are added, By controlling reduction temperature and stirring speed the reduction rate of silver in silver sulfide can be up to above 95%. |
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