FIELD: metallurgy; chemical means of cleaning surfaces of metal products. SUBSTANCE: used hydrochloric acid was recovered by heating, spraying solution into hot products of fuel combustion, and separating oxide dust to obtain aqueous solution of hydrochloric acid. Aqueous solution of hydrochloric acid was made by absorbing hydrogen chloride with sewage water. Concentration of hydrochloric acid to be recovered was additionally stepped up by repeated evaporation and thermal treatment that brought about decomposition of iron chloride. Yield of recovered used hydrochloric acid was raised to 20.8 % . EFFECT: higher yield of recovered hydrochloric acid. 1 dwg, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| PICKLING-REGENERATION PROCESS AND METHOD FOR REGENERATION OF SPENT PICKLING SOLUTION | 2003 |
|
RU2232208C1 |
| METHOD OF RECOVERY OF THE SPENT SOLUTIONS OF THE HYDROCHLORIC ACID | 2005 |
|
RU2294982C1 |
| METHOD FOR PROCESSING WASTE OF IRON CHLORIDE SOLUTIONS | 2020 |
|
RU2752352C1 |
| METHOD AND FACILITY FOR REGENERATION OF SOLUTIONS WHICH ARE USED FOR ETCHING OF METALS | 2003 |
|
RU2330902C2 |
| METHOD OF RECYCLING SPENT ETCHING SOLUTIONS CONTAINING IRON (II) SULPHATES AND CHLORIDES | 2010 |
|
RU2428522C1 |
| METHOD OF REGENERATING CHLORIC ACID ETCHING SOLUTION | 0 |
|
SU834249A1 |
| METHOD OF RECOVERING NITRIC AND HYDROFLUORIC ACIDS FROM PICKLING SOLUTIONS | 0 |
|
SU1739859A3 |
| METHOD OF PREPARING IRON-CONTAINING COAGULANT | 2010 |
|
RU2424195C1 |
| METHOD OF REGENERATIVE PURIFICATION OF COPPER-AMMONIA ETCHING SOLUTIONS | 2007 |
|
RU2334023C1 |
| METHOD OF PRODUCING IRON-CONTAINING COAGULANT FROM PRODUCTION WASTES | 2018 |
|
RU2702572C1 |
