SU218860A1 - METHOD FOR CLEANING CHROMIUM OXIDE HYDRATE - Google Patents
METHOD FOR CLEANING CHROMIUM OXIDE HYDRATEInfo
- Publication number
- SU218860A1 SU218860A1 SU1068962A SU1068962A SU218860A1 SU 218860 A1 SU218860 A1 SU 218860A1 SU 1068962 A SU1068962 A SU 1068962A SU 1068962 A SU1068962 A SU 1068962A SU 218860 A1 SU218860 A1 SU 218860A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- chromium oxide
- oxide hydrate
- cleaning
- cleaning chromium
- sulfuric acid
- Prior art date
Links
- OGDYVWQEAVKKDI-UHFFFAOYSA-N chromium(3+);oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Cr+3].[Cr+3] OGDYVWQEAVKKDI-UHFFFAOYSA-N 0.000 title description 4
- 238000004140 cleaning Methods 0.000 title 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 239000002244 precipitate Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- VQWFNAGFNGABOH-UHFFFAOYSA-K Chromium(III) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical class [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- PXLIDIMHPNPGMH-UHFFFAOYSA-N Sodium chromate Chemical compound [Na+].[Na+].[O-][Cr]([O-])(=O)=O PXLIDIMHPNPGMH-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012264 purified product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 150000003388 sodium compounds Chemical class 0.000 description 1
- -1 sodium monochromate Chemical class 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Description
Изобретение относитс к области очистки гидрата окиси хрома, полученного в процессе восстановлени хроматных растворов серой.The invention relates to the field of purification of chromium hydroxide, obtained in the process of reduction of chromate solutions with sulfur.
Известен способ очистки гидрата окиси хрома путем обработки его серной кислотой при 60-80°С, отделени образующегос осадка, промывки его и прокаливани при 1260- 1370°С.A known method of purifying chromium hydroxide is by treating it with sulfuric acid at 60-80 ° C, separating the precipitate formed, washing it and calcining at 1260-1370 ° C.
Недостатком такого способа вл етс высокое содержание примесей в продукте (содержание серы, например, доходит до 3-3,5о/оЗ, а также необходимость применени коррозийностойкой аппаратуры.The disadvantage of this method is the high content of impurities in the product (the sulfur content, for example, reaches 3-3.5o / oZ, as well as the need to use corrosion-resistant equipment.
Дл повышени степени очистки предлагаетс обработку гидрата окиси хрома серной кислотой вести в присутствии соединений шестивалентного хрома, например монохромата натри , при рН, равном 5-5,8.In order to increase the degree of purification, it is proposed that chromium oxide hydrate is treated with sulfuric acid in the presence of hexavalent chromium compounds, such as sodium monochromate, at a pH of 5-5.8.
Содержание серы в очиш,енном продукте уменьшаетс с 3-3,5 до 0,01о/о; остальные примеси (мышь к, цинк, свинец) не превышают 0,0020/0.The sulfur content in the purified product is reduced from 3-3.5 to 0.01o / o; other impurities (mouse, zinc, lead) do not exceed 0.0020 / 0.
Пример. В реактор емкостью 1 л, снабженный электрообогревом и перемешивак;щим устройством, загружают 0,6 л суспензии гидрата окиси хрома в растворе мопохромата натри ( : Ю). К нагретой до кипени суспензии медленно в течение 30-40 мин приливают серную кислоту до рН реакционной массы 5,5 (контроль по индикатору). Полученную реакционную массу фильтруют на воронке под вакуумом при скорости фильтрации от 3 до 4,0 мл/см мин.Example. A 1 liter reactor equipped with electrical heating and a stirring device is charged with 0.6 l of a chromium oxide hydrate suspension in a solution of sodium mopochromate (: S). Sulfuric acid is slowly added to the suspension heated to boiling over a period of 30-40 min. Until the pH of the reaction mass is 5.5 (indicator control). The resulting reaction mass is filtered on a funnel under vacuum at a filtration rate of 3 to 4.0 ml / cm min.
Осадок после отделени от маточного расгвора промывают на фильтре гор чей водой с промежуточной репульпацией.The precipitate, after separation from the uterine solution, is washed on the filter with hot water with intermediate repulpation.
В зависимости от кратности промывки, равной 5, 10 и 20, содержание соединений натри в пересчете на NaoO в осадке составл ет соответственно 0,32; 0,12; 0,007о/с. Промытый осадок прокаливают 1 час npjiDepending on the washing ratio of 5, 10, and 20, the content of sodium compounds in terms of NaoO in the sediment is respectively 0.32; 0.12; 0.007o / s. The washed precipitate is calcined for 1 hour. Npji
1300°С. Содержание мышь ка в полученном продукте не превышает 0,002з/о.1300 ° C. The content of the mouse in the resulting product does not exceed 0,002z / o.
Предет изобретени Predet invention
Способ очистки гидрата окиси хрома путем обработки его серной кислотой при повышенной температуре с выделением осадка, промывкой его и прокаливанием, отличающийс тем, что, с целью повышени степени очистки, обработку исходного продукта осуществл ют в присутствии соединений шестивалентного хрома, например монохромата натри , прп рП, равном 5-5,8.A method of purifying chromium oxide hydrate by treating it with sulfuric acid at elevated temperature, separating the precipitate, washing it and calcining, characterized in that, in order to increase the degree of purification, the initial product is processed in the presence of hexavalent chromium compounds, e.g. equal to 5-5.8.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU218860A1 true SU218860A1 (en) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2591245C2 (en) * | 2010-12-08 | 2016-07-20 | ЛЕНКСЕСС Дойчланд ГмбХ | Method of producing chromium (iii) oxide |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2591245C2 (en) * | 2010-12-08 | 2016-07-20 | ЛЕНКСЕСС Дойчланд ГмбХ | Method of producing chromium (iii) oxide |
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