METHOD FOR REDUCTION OF ARSENIC (V) COMPOUNDS CONTAINING IN PRODUCTS OF LEWISITE ALKALINE DETOXICATION TO ARSENIC (III) COMPOUNDS Russian patent published in 2009 - IPC C01G28/00 A62D3/00 C02F11/08 

FIELD: chemistry.

SUBSTANCE: invention refers to the chemical engineering in particular to the treatment and production of arsenic-containing products. The method for reduction of arsenic (v) compounds containing in the products of lewisite alkaline hydrolysis includes sequential input to the acidated solution of reaction mass of the potassium or sodium iodide in the amount equal to 10±0.2% of the amount necessary for complete reduction of arsenic acid to arsenic (III) compounds and ascorbic acid or hydrazine in the amount necessary for complete reduction of arsenic (V) compounds to arsenic (III) compounds. The reduction process is carried out during 0.5-2 hrs at the temperature 60-70°C and stirring.

EFFECT: invention provides the reduction of arsenic (V) compounds with decreasing of the undesirable admixtures content in the decontaminated system and can be used in research and industrial operations connected with treatment of lewisite-containing masses as well as in treatment of different arsenic-containing silts formed in metallurgical production.

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