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2 836 982

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(51)

IPC

C01G37/00(2006-01-01)

(21) (22)

Application

2024119269, 2024-07-10

(24)

Start date

2024-07-10

(22)

Actual filing date

2024-07-10

(45)

Published

2025-03-24

(72)

Inventor

Izmalkin Vasilii IvanovichGraf Viktor EduardovichEpifantsev Aleksandr SergeevichMaramygin Vitalii LeonidovichOrekhova Aleksandra Viacheslavovna

(73)

Holder

Aktsionernoe Obshchestvo Zavod Khromovykh Soedinenii»

METHOD OF PROCESSING SLUDGE OF CHROMATE PRODUCTION Russian patent published in 2025 - IPC C01G37/00

Abstract RU 2836982 C1

FIELD: non-ferrous metallurgy.

SUBSTANCE: method for processing sludge of chromate production includes extraction of chromium from sludge obtained after processing Kempirsai deposit ore according to dolomite-free technology, containing, wt.%: 14-18 Na₂O, 5-11 Cr₂O₃, 0.1-0.5 CrO₃, 7-11 Al₂O₃, 16-19 Fe₂O₃, 23-30 MgO, 7-14 SiO₂, ≤0.6 CaO. Sludge is fired at temperature of 1200-1260 °C, then one performs grinding, leaching with water and separation of the obtained precipitate from the sodium chromate solution. During calcination, soda ash can be added to the sludge.

EFFECT: high efficiency and reduced number of substances used in the method.

2 cl, 7 ex

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RU 2 836 982 C1

Authors

Izmalkin Vasilii Ivanovich

Graf Viktor Eduardovich

Epifantsev Aleksandr Sergeevich

Maramygin Vitalii Leonidovich

Orekhova Aleksandra Viacheslavovna

Dates

2025-03-24—Published

2024-07-10—Filed