ساخت لقمه سنگ اسيدي به منظور پردازش نهايي سنگ ساختماني مرمريتي

چكيده انگليسي :

Manufacturing Acidic Abrasive for Final Treatment of Building Marble Stones Dalal Alsoliman chem dalal@gmail com January 20 2019 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree MSc Language PersionProf Ahmad Moheb ahmad@cc iut ac irProf Rahmatollah Emadi remadi@cc iut ac irAbstractAbrasion and final polishing on the exterior surface of the building marbles is one of the mostimportant stage in the stone processing in stone industries For this purpose at first abrasives withdifferent composition and roughness are used successively for mechanical treatment of the stonesurface and then acidic abrasives are used for final polishing of the surface High quality acidicabrasives which are basically expensive are imported from Italy and Turkey and low quality samplesfrom China Due to the very large number of stone factories in Iran which use these abrasives a hugeamount of foreign currency is used annually to import them from contries previously mentioned Theaim of this study was manufacturing a type of acidic stone abrasive with the proper quality for finalpolishing of marble stones To do this at first a sample of a high quality Italian acidic stone abrasivenamed TENAX which is widely used in stone industries was characterized by FT IR ICP XRD XRF AAS analyses and some other tests to determine the composition and some other properties ofthis product The results of analyses indicated that the Italian acidic abrasive consists of alumina asthe abrasive material a mixture of potassium biaoxalate and oxalic acid as the reactive substance and cardanol based phenolic resin as the binder Also the density and mechanical strength of thisforeign product were measured Then the necessary raw materials which were available in thedomestic market were bought to manufacture the samples by dry powder compression method Forthis purpose a double action pressing mold was designed and built of MO40 alloy due to its hardness In order to determine the optimal composition of the acidic abrasive the powder was mixed withvarious propotions pressed under a pressure of 110 bar by using a proper lubricating agent to reducethe friction between the particles and the internal surface of the mold Then the molded sample wascured at temperature of 110 oC for 2 hours and a half After reaching samples with differentcombinations that were good in terms of shape and strength the next step was choosing the bestsample in terms of life time and its polishing performance and final stone surface roughness To thisaim a laboratory stones polishing instrument with rotation rate of 500 550 rpm and abrasion pressureof 2 3 bar was designed and construcred and then the samples were tested for abrasion on the marblestone In this set of experiments the effects of combination of the abrasives and water flow rate onthe stone surface roughness outlet water pH and the abrasive life time were investigated and theresults were compared with the performance of the Italian sample The results showed that theoptimized samples consisted of 10 wt resin 18 wt alumina and 72 wt oxalate mixture For thissample the optimal operation conditions were abrasion pressure of 2 bar and water flow of 180

عباس السليمان، دلال

ساخت لقمه سنگ اسيدي به منظور پردازش نهايي سنگ ساختماني مرمريتي

لقمه سنگ اسيدي , اگساليك اسيد , پتاسيم بي اكسالات , سنگ مرمريت , فنوليك رزين