FIELD: chemistry. SUBSTANCE: invention can be used in electroplating in recycling chromium-containing effluents. Method of extracting chromium (VI) from chromium-containing solutions of galvanic production to obtain low-water-bearing iron-chromium-containing precipitate involves adding to chromium-containing solution concentrated sulphuric acid in amount of 6–120 ml/l and crushed steel chips as a reducing agent with subsequent maintenance until decolouration of the solution. Steel shavings with specific surface area of 2.5–2.8 m2/kg is taken in amount of 800–1500 g/l and before loading is activated by successive chemical degreasing and holding in solution of sulphuric acid with concentration of 100–200 g/l or etching solution without acid corrosion inhibitor. EFFECT: invention increases completeness of extraction of chromium from chromium-containing solutions.
Translated title of the contributionMethod of extracting chromium (vi) from solutions to obtain iron-chromium precipitate: patent of invention
Original languageRussian
Patent number2698810
IPCC02F 1/62,C02F 1/70,C01G 37/00,C01G 49/00,C02F 101/22,C02F 103/16
Filing date20/12/2017
Publication statusPublished - 30 Aug 2019

ID: 12560679