CS216867B1 - Method of preparation of alloys clinic with strontium - Google Patents
Method of preparation of alloys clinic with strontium Download PDFInfo
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- CS216867B1 CS216867B1 CS734180A CS734180A CS216867B1 CS 216867 B1 CS216867 B1 CS 216867B1 CS 734180 A CS734180 A CS 734180A CS 734180 A CS734180 A CS 734180A CS 216867 B1 CS216867 B1 CS 216867B1
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Abstract
Vynález rieši spSsob přípravy zliatin hliníka so stronciom elektrolýzou tavenín. Podstata vynálezu spočívá v tom, že sa tavenina chloridov a fluoridov alkalických kovov s hmotnostným obsahom 1 až 51 % chloridu strontnatého elektrizuje s použitím hliníkovej katody pri teplote 650 až 850 °C a katodické) prúdovej hustotě do 100 Adm~2.The invention solves a method of preparing aluminum alloys with strontium by electrolysis of melts. The essence of the invention is that a melt of alkali metal chlorides and fluorides with a mass content of 1 to 51% strontium chloride is electrified using an aluminum cathode at a temperature of 650 to 850 °C and a cathodic) current density of up to 100 Adm~2.
Description
Vynález rieši spósob přípravy zliatin hliníka so stronciom elektrolýzou tavenín.The invention provides a process for the preparation of aluminum alloys with strontium by electrolysis of melts.
Zliatina hliníka so stronciom (do 10 % hmotnosti stroncia) sa využívá ako predzliatina na modifikáciu silumínu. Vnesením malého množstva stroncia (hmotnostný obsah 0,005 až 0,05%) do silumínu sa dosiahne zjemnenie jeho štruktúry a tým aj zlepšeme mechanických vlastností. Stroncium sa do silumínu vnáša 4 až 8 hodin zahrievaním (t = 730°C) so solami uvolňujúcimi stroncium alebo přidáváním stroncia vo formě čistého kovu, resp. vo formě predzliatiny hliník-stroncium. Očkovanie silumínu so sofami stroncia je proces málo intenzívny a využitie vzácných solí stroncia je neefektivně.Strontium aluminum alloy (up to 10% by weight of strontium) is used as a master alloy to modify silumin. By introducing a small amount of strontium (0.005-0.05% by weight) into silumin, the structure is refined and the mechanical properties are improved. The strontium is introduced into the silumin for 4 to 8 hours by heating (t = 730 ° C) with strontium-releasing salts or by adding strontium in the form of pure metal, respectively. in the form of an aluminum-strontium alloy. Vaccination of silicon with strontium salts is a low-intensity process and the use of rare strontium salts is inefficient.
Vyššie uvedené nevýhody odstraňuje spósob přípravy zliatin hliníka so stronciom podl'a vynálezu, ktorého podstata spočívá v tom, že sa tavenina chloridov a fluoridov alkalických kovov s hmotnostným obsahom 1 až 51 % chloridu strontnatého elektrolyzuje s použitím hliníkovej katody pri teplote 650 až 850 °C a katodickej prúdovej hustotě do 100 Adm~2.The aforementioned disadvantages are overcome by the process for the preparation of strontium aluminum alloys according to the invention, which consists in that the melt of alkali metal chlorides and fluorides containing from 1 to 51% by weight of strontium chloride is electrolyzed using an aluminum cathode at a temperature of 650 to 850 ° C. and cathodic current density up to 100 Adm- 2 .
Výhoda vynálezu je v tom, že predzliatinu hliníka so stronciom je možné pripraviť s menšou energetickou náročnosťou a podstatné jednoduchším technologickým zariadením. Odpadá tu nutnost výroby čistého stroncia.An advantage of the invention is that the strontium aluminum master alloy can be prepared with less energy and substantially simpler technological equipment. There is no need to produce pure strontium.
Spodná hranica teploty je daná teplotou topenia hliníka, resp. zliatiny obsahujúcej hliník a horná hranica fyzikálnymi vlastnosťami taveniny. Zloženie elektrolytu v uvedených taveninových sústavách, z hfadiska vysokej prúdovej účinnosti, nie je limitujúcim faktorom. Má však s ohladom na jeho hustotu velký význam pri usporiadaní experimentu. Niektoré taveniny uvedených sústav majú hustotu zrovnatefnú s hustotou hliníka, potom sa hliník v tavenine vznáša, iné majú hustotu váčšiu alebo menšin, ako hliník, a preto sa počas elektrolýzy hliník nachádza na povrchu alebo na dne elektrolyzéra.The lower temperature limit is given by the melting point of aluminum, respectively. aluminum-containing alloys and upper limit by the physical properties of the melt. The electrolyte composition in said melt assemblies, in view of high current efficiency, is not a limiting factor. However, due to its density, it is of great importance in the design of the experiment. Some of the melts of these systems have a density comparable to that of aluminum, then the aluminum floats in the melt, others have a density less or minor than that of aluminum, and therefore, during electrolysis, aluminum is on the surface or bottom of the electrolyzer.
V príkladoch sú uvedené zloženia elektrolytu, v ktorých je hliník na dne, resp. plává na povrchu taveniny. Ak sa elektrolýza uskutočňuje pri nižších prúdových hustotách, do 10 Adm-2 a doba trvania elektrolýzy je 0,5 až 2 hodiny, vylučuje sa stroncium so 100 až 80 % prúdovou účinnosťou. Ak sa použije vyššia prúdová hustota od 10 do 100 Adrrr2, potom v zaujme zachovainia vysokej prúdovej účinnosti sa musí zabezpečit’ miešanie systému. Nad udanou hornou hranicou prúdovej hustoty sa vylučuje spolu so stronciom aj alkalický kov a účinnost procesu klesá.The examples show electrolyte compositions in which aluminum is at the bottom and at the bottom, respectively. floats on the surface of the melt. If the electrolysis is carried out at lower current densities, up to 10 Adm -2 and the electrolysis duration is 0.5 to 2 hours, strontium with 100 to 80% current efficiency is excluded. If a higher current density of 10 to 100 Adrrr 2 is used , then mixing of the system must be ensured in order to maintain high current efficiency. Above the specified current density limit, alkali metal is precipitated along with strontium and the efficiency of the process decreases.
Příklad 1Example 1
Z taveniny s hmotnostným obsahom 21,75 percenta chloridu sodného +27,75 % chloridu draselného +50,50 % chloridu strontnatého sa pri teplote 730 °C vylučuje za iintenzívneho miešania kovu do hliníkovej katody stroncium s katodickou prúdovou hustotou 10 Adm~2, Anoda je grafitová. Proces sa ukončí, keď zliatina obsahuje 5 % hmotnosti stroncia.From a melt with a weight content of 21.75 percent sodium chloride + 27.75% potassium chloride +50.50% strontium chloride, strontium with a cathodic current density of 10 Adm 2 2 is precipitated with intensive stirring of the metal at 730 ° C, Anode is graphite. The process is terminated when the alloy contains 5% by weight of strontium.
Příklad 2Example 2
Z taveniny o hmotnostnom zložení 40 % chloridu sodného +10,5 % fluoridu sodného + 49,5% chloridu strontnatého sa pri teplote 850 °C vylučuje stroncium s katodickou prúdovou hustotou 10 Adm-2. Anoda je grafitová. Proces sa ukončí, ked zliatina hmotnostně obsahuje 2 % stroncia.At 850 ° C, strontium with a cathodic current density of 10 Adm -2 is precipitated from a melt with a composition of 40% sodium chloride + 10.5% sodium fluoride + 49.5% strontium chloride. The anode is graphite. The process is terminated when the alloy contains 2% strontium by weight.
Vynález má použitie v zlievárenstve pri modifikácii silumínu za účelom zjemnenja jeho štruktúry a zlepšenia mechanických vlastností.The invention has utility in foundry in modifying silumin to refine its structure and improve mechanical properties.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS734180A CS216867B1 (en) | 1980-10-30 | 1980-10-30 | Method of preparation of alloys clinic with strontium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS734180A CS216867B1 (en) | 1980-10-30 | 1980-10-30 | Method of preparation of alloys clinic with strontium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS216867B1 true CS216867B1 (en) | 1982-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS734180A CS216867B1 (en) | 1980-10-30 | 1980-10-30 | Method of preparation of alloys clinic with strontium |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS216867B1 (en) |
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1980
- 1980-10-30 CS CS734180A patent/CS216867B1/en unknown
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