METHOD OF PRODUCING MODIFIED BISMUTH POWDER Russian patent published in 2011 - IPC B22F9/24 C22B30/06 C22C12/00 

FIELD: process engineering.

SUBSTANCE: invention relates to hydrometallurgy of nonferrous metals, particularly, to production of bismuth powder modified by metal catalyst, thermoelectric materials, light alloys and medicinal preparations. Proposed method comprises reducing modifying metal and removing impurities formed in reduction. Note here that reduction is performed by processing bismuth powder by solution of appropriate modifying metal at solution pH=0.3-3.0. Impurity, bismuth main salt, is carried in reduction on adding ethylene diamine tetraacetic acid or sodium ethylenediaminetetraacetate to salt solution at solution pH=0.6-3.0 and molar ratio of ethylenediaminetetraacetate-ions to bismuth equal to 1.0-1.5. Impurity is removed on flushing obtained product by ethylene diamine tetraacetic acid or sodium ethylenediaminetetraacetate solution at pH=0.6-7 and molar ratio of ethylenediaminetetraacetate-ions to bismuth equal to 1.0-1.5.

EFFECT: simplified process, higher product purity.

3 cl, 1 tbl, 7 ex