12903

11804

كارشناسي ارشد

فرآوري مواد معدني

اصفهان: دانشگاه صنعتي اصفهان، دانشكده معدن

1396

سيزده، [75]ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محمد رئوف حسيني

حسن طباطبايي

داور داخلي: علي احمدي عامله; داور خارجي: عليرضا علافچيان

1396/07/24

كتابنامه

معدن

مهندسي معدن

ID11804

Utilization of Separation Biofluculations in the Removal of Quartz Impurities from Kaolin Mohammadreza Azizinia Date of Submission September 2017 Department of Mining Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Languag Farsi Supervisor Dr Mohammad Raouf HosseiniAbstractIn order to evaluate the quality of kaolinite the color of its impurities has always been morenoticeable But in the present era and after expanding the methods for reducing the amountof impurities in color attention has been paid to the reduction of another of the mostimportant impurities of kaolinite namely silica Due to the success of biological methods inthe separation of colored impurities their use to reduce the content of silica also effectivelyreduce the cost of operating costs In the present research the possibility of silicon separationfrom kaolinite was investigated using bioflocculation method Firstly the isotherm graphsof the biofluoclonant absorption including the bacterial strain Bacillus licheniformis andits polysaccharide excretion on the surface of kaolinite and silica were obtained at pH valuesof 9 10 11 and 12 According to these plots the highest absorption of the bioflocculantson both of the minerals happened at pH 12 Adsorption density on kaolinite was more thansilica and absorption of polysaccharide was higher than the bacterial cells Also both of theminerals showed an increase in adsorption density with pH Secondly sedimentation testswere conducted on each mineral using the both bioflocculant at the four pH values Theresults showed that employment of bioflocculants changed the mineral deposition in all ofthe tested pHs In the control tests conducted without flocculant precipitation decreased byrising pH to 11 Decline in silica precipitation was stopped at pH 12 while a sharp increasewas observed for kaolinite sedimentation at this pH Sedimentation experiments using thebacterial cells indicated a similar trend However mineral flocculation usingpolysaccharides showed a persistent increase from pH 9 to 12 Finally using the dataobtained from the previous stages extra tests were carried out using a 50 50 artificialcombination of the both minerals which resulted in the separation of both minerals Employing the bacterial cells 98 3 of kaolinite was recovered and the kaolinite contentof the mixture increased by 8 2 Also when the bacterial polysaccharide was employed asthe bioflocculant silica content was increased by 7 with the low recovery of 30 7 Thesevalues in the control separation tests were 84 8 and 10 3 respectively Finally it can beconcluded that using the bacterial cells as the bioflocculant an acceptable improve in thekaolinite content with a high recovery is attainable Keywords Bioflocculation Kaolinite Silica Bacterial cell Extracellular polysaccharide

محمد رئوف حسيني

حسن طباطبايي

داور داخلي: علي احمدي عامله; داور خارجي: عليرضا علافچيان