METHOD FOR OBTAINING AN ADSORBENT FOR PURIFICATION OF WASHING WASTEWATER FROM HEXAVALENT CHROMIUM Russian patent published in 2023 - IPC C02F1/28 C02F1/62 B01J20/06 B01J20/30 

FIELD: wastewater treatment.

SUBSTANCE: method for producing an adsorbent for cleaning wastewater from hexavalent chromium includes mixing metallurgical dust with a reducing agent to a paste-like state, calcining the resulting mixture in a three-zone rotary kiln for 1 hour, and cooling the resulting powdered adsorbent to the temperature of the production premises. Moreover, used mineral oil is used as a reducing agent in a ratio with metallurgical dust of 1:1 weight parts, and calcination is carried out at a temperature of at least 600°C with the reduction of ferric iron to ferrous iron with the formation of magnetite.

EFFECT: materials differentiation for the manufacture of magnetite with a focus on secondary raw materials, as well as simplification of the technology for its production, which can lead to a reduction in the cost of magnetite and improvement of the conditions for its production, as well as a reduction in the cost of treatment of one meter of cubic wastewater containing hexavalent chromium, without deterioration of cleaning efficiency.

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