Vacuum Distillation Of Miscellaneous Aluminum Alloy Scrap Addition To The Zinc

The rapid speed of the regenerative aluminium industry has greatly alleviated the shortage of the aluminium resource of our country,which was caused by the lack of the alumina.The method in the text,using the vacuum distillation law to purify the industrial scrap aluminium including the zinc,has avoided the defect of the traditional technics producing the regenerative aluminium,such as the low reclaim rate,the high pollution,and the high cost.Furthermore,it also has some excellences, such as the short flow,the simple operation which can use in the automatization easily,the slight cauterization of the equipment and the high quality of the production.Clearly,it has found a new way to produce the regenerative aluminium.The paper first has simulated the thermodynamic property of the aluminum-zinc binary alloy system using the coexistence theoretical model and the Wilson equation. The result indicated that,using the coexistence theoretical model,the thermodynamic data which obtains from the aluminum-zinc binary alloy system conforms to the reality.When using coexistence theoretical model,the thermodynamic data becomes the symmetrical positive deviation,and the error to the accurate experimental activity not surpass 0.1%.It can forecast the aluminum-zinc binary alloy system better.On the basis of thermodynamics data received,the feasibility to purify the waste aluminium of industry using the vacuum distillation law is analyzed.Judging by the separation of the aluminum-zinc binary alloy system through three kinds of thermodynamics and analytical methods firstly,the result indicates that the aluminum-zinc binary alloy system is easy to be separated.According to the balance chart of the gas- liquid,the separation intensity of the alloy was analyzed at the same time.Secondly the four pieces of course of the metal vacuum distillation has been analyzed.The speed of the transmission,the evaporation and the condensation during the whole distillation,of the zinc has been discussed.The experiment was researched with the vacuum resistance furnace.The range of the temperature and the time of distillation was conformed through the experiment at first.When the zinc content of raw materials is 10 percent,the distillation temperature between 953K- 1103K,and the time is 20-60min,the result can meet the experimental requirement,which is the zinc content is smaller than 0.1 percent.The influence of the time,the temperature,the vacuum degree and the content of zinc in the raw materials was investigated separately.The better experimental result has been reached.The best parameter to get the aluminium and the zinc from the residues and the volatile at the same time is that the temperature is 1003K,the time is 30 minutes,and the time vacuum degree is 15Pa.At this moment, the content of the zinc in residues is smaller than 0.1percent,and the content of the volatile zinc is greater than 99.9percent.Zinc content in residues is affected greatly by zinc content in the raw materials,and the less the zinc content in the raw materials,the better the separation is.The higher the vacuum degree,the better the separation is.The volatile speed of the zinc in different distillation temperature and with different zinc content has been calculated,and three formulas between the temperature and the volatile speed of the zinc have been founded.