In the smelting process used krusibel kitchen . The material used is Al scrap student research results . The first thing done is the kitchen preparation process . Starting from the melting furnace cleaning and coating the coating to the placement of coal briquettes in large furnaces .
During the smelting process , the material used Al pre-heating process is carried out . It aims to eliminate the moisture on the surface of the material to avoid the formation of gas and dissolve in the molten metal which can cause gas defects . After the pre - heating the metal material is inserted into the furnace and allowed to melt . During smelting coal briquettes continuously added to maintain a stable supply of heat to melt the metal . ( Read: proses pengecoran aluminium )
i . alloying
In addition to the casting process which aims to produce the products according to the value dimension is also required mechanical properties suitable material . Provision of additional material ( alloying ) aims to improve the mechanical properties of the material prices . For Al granting alloying material using material Cu , Zn , Mg , P , Si , Sr , and Na .
In this lab strengthening alloying is not done . When it is done and then the sample testing ( tensile , hard ) then the resulting value is greater than without alloying .
ii . degassing
At high temperatures the hydrogen gas will tend to diffuse into the molten metal . The hydrogen gas must be removed from the molten aluminum because it will cause defects in the casting . The process is called process gas expenses degasser . Degasser is generally used in the form of tablets or gas ( argon gas and nitrogen gas ) . Gas flushing mechanism in liquid aluminum metal are as follows :
Tablets are inserted into the molten aluminum will produce gas in the form of bubbles that almost vacuum ( < 1 atm ) . Hydrogen gas dissolved in the aluminum can not get out because the pressure inside the liquid Aluminum << 1 atm while the outside pressure of 1 atm . As a result of air bubbles produced tablets fit into hydrogen gas and air bubbles are carried upwards bersaman with other impurities dissolved in liquid aluminum . Gases or air bubbles are mostly going to be dross and will be discharged through the discharge process dross . In this lab degasser is not used .
iii . cover Flux ( teknik pengecoran aluminium )
Once the process is complete degasser continued with the process of flux . The process of granting flux aims to cover or covering the surface of the liquid aluminum metal to avoid the entry of hydrogen gas into aluminum metal . Provision made during flux melting aluiminium start by sprinkling flux on the surface of liquid aluminum . Covering flux function for covering the surface of the molten metal in order to avoid the entry of hydrogen gas . Giving this kind of flux conducted without stirring . At the time of the flux covering practical use .
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Βέβαια και το αρχικό άρθρο κρατάει σοβαρές επιφυλάξεις για την ποσότητα και την εκμεταλλευσιμότητα των κοιτασμάτων:Nevertheless, the critics cite that it is too early to make esanttmiois on possible reserves, noting the Greek Administration is looking "boost" its political profile in US, so as to elevate the importance of the country as a source of substantial amounts of hydrocarbons.