Claisse fluxer

Extensive analytical efforts to fully characterize the oil shales are underway at Exxon Research and Engineering Company s Baytown Laboratories. No significant losses of any metals of concern are observed during high temperature ashing. An alternate means of rapid ash determination uses a Parr combustion bomb. The ash can be dissolved by alkaline fusion in a Claisse fluxer or by acid dissolution in a Parr bomb. The solutions thus prepared are analyzed by atomic absorption or by inductively coupled plasma emission spectrometry for major (Al, Ca, Fe, K, Mg, Na, Si, Ti) and trace elements (As, B, Ba, Be, Cd, Co, Cr, Cu, Li, Mn, Mo, Ni, P, Sr, U, V, Zn). Kerogen enriched shales need to be ashed before the dissolution, otherwise low recoveries are obtained. Overall accuracy and precision of metals determination is within... 

Claisse Fluxer Analysis - Lithium tetraborate or metaborate fusion for the dissolution of rocks has been in use for many years. The Claisse Fluxer fusion device simply makes this fusion automated. We have used the method in the past for the fusion of coal and fly ashes (10,13). Oil shales can be dissolved by this method without pre-ashing. Once the solution is prepared, it may be analyzed for the most part by ICPES or by AAS. Analysis of U.S.G.S. Devonian Ohio shale SDO-1 by fusion followed by AAS or ICPES measurements is illustrated in Table III. 

KEY WORDS gypsum. X-ray fluorescence, thermogravimetry. analysis of gypsum, borates. Claisse fluxer, synthetic standards, matrix corrections... 

A small amount, 2.5 to 3.0 g of representative gypsum specimen, was calcined for 1 h at 1000°C in a platinum crucible, and the loss on ignition was recorded. A portion of 1.0000 g of the calcined specimen was mixed with 6.000 g of dense lithium tetraborate (Spectroflux 100 , Johnson and Matthey Co.) and 0.3000 g of lithium fluoride. Approximately 3 mg of lithium bromide was added to the mixture as a release (nonsticking) agent. Fusions were carried out on a propane flame, using a Claisse fluxer (2] equipped with crucibles and molds made from 95% platinum-5% gold alloy. The volume of molten flux was adequate to fill the 32-mm diameter mold to a sufficient height and produce a disk approximately 4 mm thick. 

Fuse for 4 min on a Claisse fluxer (stationary heat) and swirl for 3 min on the flame. 

Claisse Fluxer for Preparation of Glass Discs." Corporation Scientifique Claisse. Ste Foy, Quebec. Canada. 

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