پديد آورنده :
زاده بافقي، عليرضا
عنوان :
تاثير خاك ورزي و ابعادبركه باطله بر زوال طبيعي سيانور
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران
صفحه شمار :
سيزده، 97، [II]ص.: مصور، جدول، شكل، نمودار
استاد راهنما :
امير تائبي
استاد مشاور :
مجيد افيوني
توصيفگر ها :
پساب هاي صنعتي , پارامترهاي هواشناسي , رنگ سنجي , مدل رگرسيوني
استاد داور :
ايوب كريمي جشني، مجيد سرتاج
تاريخ ورود اطلاعات :
1396/02/23
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Effect of Tillage and Tailings Impoundment Dimensions on Natural Degradation of CyanideAbstractNatural degradation of cyanide is one of the oldest methods used in industrial cyanidetreatment especially in the extraction of precious metals like gold In this method theprocess effluent slurry is pumped into a tailings pond for a period that can vary fromweeks to months in order to facilitate the process of natural degradation of cyanide Volatilization is the most effective mechanism in natural degradation of cyanide controlled by a number of parameters including impoundment surface temperature aswell as porosity and density of soil The objective of the present study was to determinethe effects of those parameters involved in natural degradation that can be varied tooptimize the design or operation of tailings impoundment For this purpose time splitfactorial design experiments were carried out using three major variables surface todepth ratio tillage and cyanide initial concentration The experiments included 4 levelsfor time 3 levels for surface to depth ratio 2 levels for tillage 2 levels for initialconcentration all with three replications to yield a total number of 36 pilots and 144 soilcyanide measurements Statistical analysis of the results showed that time tillage initialconcentration and surface to depth ratio led to significant effects on soil cyanide removalefficiency at a reliability of one percent with time having the highest effect Cyanideconcentration gained a decreasing trend with time This trend was faster during the firstdays slowing down as time passed with a corresponding decrease in removal efficiency The regression model of variations in soil cyanide concentration was found to belogarithmic with respect to time It was concluded that the mean soil cyanideconcentration in tilled pilots was lower than in pilots that had not been tilled However itcan be expected that the lower the tillage period the higher the cyanide volatilization willbe It was shown moreover that the higher the surface to depth ratio of a given volumeof cyanide polluted soil the faster will be the reduction of cyanide residual This meansthat increased surface to depth ratio causes a corresponding increase in cyanide removalefficiency The regression model of cyanide concentration variations with respect tosurface to depth ratio was found to be exponential The effect of interaction of parameterswas observed to be not as significant as those of the main parameters Finally a modelwas developed from the above observations to predict cyanide concentration with respectto time primary pollution and surface to depth ratio
استاد راهنما :
امير تائبي
استاد مشاور :
مجيد افيوني
استاد داور :
ايوب كريمي جشني، مجيد سرتاج
