FIELD: chemistry.
SUBSTANCE: spent etching solutions containing iron (II) sulphates and chlorides are recycled through oxidation of iron (II) cations using an oxidising agent and intended use of the treated solutions. The oxidising agent used is a sodium hypochlorite concentrate containing sodium hypochlorite and sodium hydroxide. The obtained suspension is treated with a minimal amount of mineral acid until dissolution of the residue and the treated solutions are used as coagulants in water treatment processes.
EFFECT: complete non-waste recycling of spent etching solutions with intended use of the oxidised solutions as coagulants in water treatment processes.
1 tbl, 4 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PREPARING IRON-CONTAINING COAGULANT | 2010 |
|
RU2424195C1 |
| METHOD OF PRODUCING IRON-CONTAINING COAGULANT FROM PRODUCTION WASTES | 2018 |
|
RU2702572C1 |
| METHOD OF DISPOSAL OF WASTE METAL ETCHING SOLUTION | 2020 |
|
RU2747666C1 |
| METHOD OF PROCESSING SPENT SULPHURIC ACID ETCHING SOLUTIONS | 2020 |
|
RU2740063C1 |
| METHOD FOR PRODUCING COMPLEX IRON-CONTAINING COAGULANT | 2022 |
|
RU2784031C1 |
| METHOD FOR OBTAINING COAGULANT | 2023 |
|
RU2818198C1 |
| PROCESSES FOR PREPARING SOLUTION OF MIXED MAGNESIUM CHLORATE AND HYPOCHLORITE | 0 |
|
SU1624057A1 |
| METHOD OF PRODUCTION OF THE MAGNETIC LIQUID | 2006 |
|
RU2307856C1 |
| CHEMICAL ADDITIVE FOR CEMENT ARTICLES | 2015 |
|
RU2612185C1 |
| MAGNETIC LIQUID PRODUCTION METHOD | 2001 |
|
RU2193251C2 |
