SU603631A1 - Method of recovering selenium from slimes - Google Patents
Method of recovering selenium from slimesInfo
- Publication number
- SU603631A1 SU603631A1 SU762399429A SU2399429A SU603631A1 SU 603631 A1 SU603631 A1 SU 603631A1 SU 762399429 A SU762399429 A SU 762399429A SU 2399429 A SU2399429 A SU 2399429A SU 603631 A1 SU603631 A1 SU 603631A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- selenium
- nitric acid
- acid
- extracting
- leaching
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B19/00—Selenium; Tellurium; Compounds thereof
- C01B19/02—Elemental selenium or tellurium
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
Изобретение относитс к технологии селена , в частности к способам извлечени селена нз шпамов н технических продуктов, где он присутствует в элементарном состо-51НИН .The invention relates to the technology of selenium, in particular, to methods for extracting selenium from spam products and technical products, where it is present in the elementary state-51NIN.
Известен способ извлечени селена из технических продуктов и шламов выщелачиванием элементарного селена раствором, содержащим азотную кислоту, при вО-ЮО С с окислением селена до ее двуокиси и последующим восстановлением селена из очищаемого раствора муравьиной - кислотой J.A known method for extracting selenium from technical products and sludges is by leaching elemental selenium with a solution containing nitric acid, with BO-CU with oxidation of selenium to its dioxide and subsequent recovery of selenium from the purified solution of formic acid J.
Недостатком известного способа вл емс необходимость проведени процесса при повышенной температуре и значительном рао ходе кислоты в коррозионностойкой аппаратуре .A disadvantage of the known method is the necessity of carrying out the process at elevated temperature and significant acid development in corrosion-resistant equipment.
Целью изобретени вл етс снижение рао ходи реагентов и. упрощение процесса.The aim of the invention is to reduce the reagent consumption and. simplify the process.
Это достигаетс тем, что окисление ведут при 2О-45 С и весовом соотношении 1ОО азЛной кислоты и селена равном 1: 3,5-4,5 с последующим восстаиовлением известным способом This is achieved by the fact that the oxidation is carried out at 200 -45 ° C and the weight ratio of 1OO azl acid and selenium is 1: 3.5-4.5, followed by reduction in a known manner.
Сущность способа заключаетс в том, что при выбранном отношении 1ОО %-ной азотной кислоты к селену в среде серной кислоты селен окисл етс до своего промежуточного валентного состо ни , образу растворимое соединение, устойчивое в концентрированной кислоте. Проведение процесса при 2О-45 С позвол ет полно вышелачигь элементарный селен при достаточной скорости процесса; при повышении температуры возникают услови дл переокислени селена, и количество азотной кислоты резко возрастает.The essence of the method is that at a selected ratio of 1% nitric acid to selenium in sulfuric acid, selenium is oxidized to its intermediate valence state, forming a soluble compound that is stable in concentrated acid. Carrying out the process at 2O-45 ° C makes it possible to completely elevate elemental selenium with sufficient process speed; as the temperature rises, conditions arise for the over-oxidation of selenium, and the amount of nitric acid increases dramatically.
П р и м е р. 2,5 кг, шлама с содержанием 1 кг селена в элементарной форме загружают в реактор, содержащий 15 л |94%-ной серной кислоты к 2 25 г 1ОО%-ной азотной кислоты. Пульпу перемешивают в течение 30 мин, затем раствор отдел ют от осадка фильтрованием. Осадок промывают 94 %-ной серной кислотой и присоедин ют к фильтрату.PRI me R. 2.5 kg of sludge with a content of 1 kg of selenium in elemental form is loaded into a reactor containing 15 liters of 94 94% sulfuric acid to 2 to 25 g of 1OO% nitric acid. The pulp is stirred for 30 minutes, then the solution is separated from the precipitate by filtration. The precipitate is washed with 94% sulfuric acid and added to the filtrate.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU762399429A SU603631A1 (en) | 1976-09-07 | 1976-09-07 | Method of recovering selenium from slimes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU762399429A SU603631A1 (en) | 1976-09-07 | 1976-09-07 | Method of recovering selenium from slimes |
Publications (1)
Publication Number | Publication Date |
---|---|
SU603631A1 true SU603631A1 (en) | 1978-04-25 |
Family
ID=20675201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU762399429A SU603631A1 (en) | 1976-09-07 | 1976-09-07 | Method of recovering selenium from slimes |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU603631A1 (en) |
-
1976
- 1976-09-07 SU SU762399429A patent/SU603631A1/en active
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