PROCEDURE FOR EXTRACTING ARSENIC FROM WATER SOLUTIONS Russian patent published in 2010 - IPC C22B30/04 C22B3/44 

FIELD: metallurgy.

SUBSTANCE: invention refers to hydro-metallurgy of non-ferrous metals, particularly to procedures of extracting arsenic from solutions and can be implemented for extracting arsenic from sewage of metallurgical, chemical and other branches of industry and also at production of metals from secondary raw materials. The procedure for extracting arsenic from solutions containing a row of metals consists in sedimentation of arsenic in form of arsenate by adding compounds of iron. For sedimentation there are used compounds of iron modified with cation surface active substance (SAS) of nano-crystals of akaganeite β-Fe³⁺O(OH) in the nano-structure range within limits from 2.12 to 2.34 nm and at pH 6-8. Arsenates are settled from solutions of arcenic ions concentration equal to 0.5-1.0 mg/l. Crystals of akaganeite modified with cation surface active substance are produced by means of sorption of cation surface active substance - hexyldecyl trimethyl ammonia bromide (HDTMBr) on akaganeite, osmosis on a membrane M 45 and sublimation drying at room temperature.

EFFECT: reduced expenditures and raised efficiency of arsenic extraction.

3 cl, 3 dwg, 1 tbl