SU458602A1 - Hydrometallurgical method of chromium extraction from slags of ferrochromic production - Google Patents
Hydrometallurgical method of chromium extraction from slags of ferrochromic productionInfo
- Publication number
- SU458602A1 SU458602A1 SU945282A SU945282A SU458602A1 SU 458602 A1 SU458602 A1 SU 458602A1 SU 945282 A SU945282 A SU 945282A SU 945282 A SU945282 A SU 945282A SU 458602 A1 SU458602 A1 SU 458602A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- slags
- chromium
- hydrometallurgical method
- chromium extraction
- ferrochromic
- Prior art date
Links
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Iron (AREA)
Description
1one
В насто щее врем осаждение гидроокиси хрома из сернокислых растворов, содержащих трехвалентный хром, производ т железным купоросом и известковым молоком.At present, the precipitation of chromium hydroxide from sulfuric acid solutions containing trivalent chromium is produced by vitriol and lime milk.
Дл повышени степени извлечени и снижени стоимости передела предлагаетс осаждение гидроокиси хрома вести с добавкой двухкальциевого силиката, полученного при прокаливании.To increase the degree of extraction and reduce the cost of redistribution, the precipitation of chromium hydroxide is proposed with the addition of dicalcium silicate obtained by calcination.
Сущность способа заключаетс в следующем . Исходный шлак, просе нный через сито (размер чеек 2,5X2,5 см), смешивают с 10% (по весу) добавки едкого натра (или едкого кали) и прокаливают в шахтных или муффельных печах при 900-1000°С. При этом происходит разрушение шпинелей, а СгаОз реагирует с едким натром (или едким кали) и образует соответственно Ыа2Сг2О7 или КгСгаО/. Продукт прокаливани выщелачивают водой; при этом хром в виде шестивалентных соединений переходит в раствор. После отделени твердого (двухкальциевый силикат) из раствора осаждают гидрат окиси хрома действием железного купороса и серной кислоты с добавкой полученного при прокаливании исходного шлака с едким натром двухкальциевого силиката:The essence of the method is as follows. The original slag, sifted through a sieve (cell size 2.5X2.5 cm), is mixed with 10% (by weight) additives of caustic soda (or caustic potassium) and calcined in shaft or muffle furnaces at 900-1000 ° С. When this occurs, the destruction of spinels, and CO2a reacts with caustic soda (or caustic potassium) and forms respectively Na2Cr2O7 or KgSgaO /. The calcination product is leached with water; while chromium in the form of hexavalent compounds goes into solution. After separation of the solid (dicalcium silicate), chromium oxide hydrate is precipitated from the solution by the action of iron vitriol and sulfuric acid with the addition of dicalcium silicate obtained by calcining the raw slag with caustic soda:
KsCr,O, + GFeSO + 7HsCO4 Сг, (804). + + 3Fe, (804)3 + К,80, + 7Н.О,KsCr, O, + GFeSO + 7HsCO4 Cr, (804). + + 3Fe, (804) 3 + К, 80, + 7N.O.,
Cr, (S04)s + 2K,S04 + 7 (2CaO SiO,) + + шН,0 2Cr (OH), + 6Fe (OH),+14Ca8O4-f + 14KOH + 78iOj-nH,O.Cr, (S04) s + 2K, S04 + 7 (2CaO SiO,) + + nH, 0 2Cr (OH), + 6Fe (OH), + 14Ca8O4-f + 14KOH + 78iOj-nH, O.
Предмет изобретени Subject invention
Гидрометаллургический способ извлечени хрома из шлаков феррохромового производства нагреванием исходного шлака с едкими щелочами с последующим выщелачиванием, отделением твердого (двухкальциевого силиката ) и осаждением из раствора гидроокиси хрома железным купоросом и серной кислотой , отличающийс тем, что, с целью повышени степени извлечени и снижени стоимости передела, осаждение ведут в присутствии двухкальциевого силиката.A hydrometallurgical method of extracting chromium from slags of ferrochromic production by heating the original slag with caustic alkalis, followed by leaching, separating the solid (dicalcium silicate) and precipitating chromium hydroxide from the solution with ferrous sulfate and sulfuric acid, characterized in that, in order to increase the recovery rate and reduce the cost of redox , precipitation is carried out in the presence of dicalcium silicate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU945282A SU458602A1 (en) | 1965-02-27 | 1965-02-27 | Hydrometallurgical method of chromium extraction from slags of ferrochromic production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU945282A SU458602A1 (en) | 1965-02-27 | 1965-02-27 | Hydrometallurgical method of chromium extraction from slags of ferrochromic production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU458602A1 true SU458602A1 (en) | 1975-01-30 |
Family
ID=20438235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU945282A SU458602A1 (en) | 1965-02-27 | 1965-02-27 | Hydrometallurgical method of chromium extraction from slags of ferrochromic production |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU458602A1 (en) |
-
1965
- 1965-02-27 SU SU945282A patent/SU458602A1/en active
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