FIELD: chemistry.
SUBSTANCE: invention can be used for the coloring of plastics, in the production of colored concrete, tiles, ceramics, pottery and porcelain. Method for the preparation of iron oxide pigments involves the preparation of a precipitate of iron (II) hydroxide by alkalization with ammonia to pH 9.0–9.2 of a solution containing iron (II) sulfate ions. Resulting precipitate is separated by filtration, and thermal oxidation is carried out at a temperature of 400–1,000 °C to obtain the pigment of the desired color. Oxidation of the filtrate with air oxygen to pH 4.1–4.7 is carried out to obtain a yellow pigment of iron (III). Yellow pigment is separated by filtration and dried at a temperature of no higher than 120 °C. Filtering processes are intensified by ultrasound at a frequency of 35 kHz in the precavitation mode.
EFFECT: invention makes it possible to obtain iron oxide pigments of a wide color range and additionally a fertilizer from the filtrates.
1 cl, 8 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF OBTAINING IRON OXIDE PIGMENTS | 2017 |
|
RU2655336C1 |
| METHOD FOR PRODUCING IRON OXIDE PIGMENT | 2017 |
|
RU2657489C1 |
| METHOD FOR PYRITE CINDER PRE-PROCESSING | 2017 |
|
RU2659505C1 |
| METHOD FOR COMPLEX PROCESSING OF SULPHIDE-OXIDISED COPPER-PORPHYRITIC ORES | 2018 |
|
RU2685621C1 |
| METHOD OF COMPLEX PROCESSING OF GOLD-CONTAINING SULFIDE ARSENIC CONCENTRATES | 2015 |
|
RU2632742C2 |
| METHOD OF RECOVERING PRECIOUS METALS FROM ORE PROCESSING PRODUCTS | 2016 |
|
RU2632740C1 |
| METHOD OF PROCESSING SULPHIDE GOLD CONTAINING CONCENTRATES AND ORES | 2015 |
|
RU2607681C1 |
| METHOD OF PROCESSING SPENT SULPHURIC ACID ETCHING SOLUTIONS | 2020 |
|
RU2740063C1 |
| METHOD OF DISPOSAL OF WASTE METAL ETCHING SOLUTION | 2020 |
|
RU2747666C1 |
| METHOD FOR PRODUCING MAGNESIUM SULPHATE AND IRON-OXIDE PIGMENTS FROM PRODUCTION WASTES | 2016 |
|
RU2634017C2 |
