Method of Preparation for High-Purity Nanocrystalline Anhydrous Cesium Perrhenate
This paper is devoted to the preparation of high-purity anhydrous nanocrystalline cesium perrhenate, which is applied in catalyst preparation. It was found that anhydrous cesium perrhenate with a crystal size <45 nm can be obtained using cesium ion sorption and elution using aqueous solutions of perrhenic acid with subsequent crystallisation, purification, and drying. The following composition of the as-obtained product was reported: 34.7% Cs; 48.6% Re and <2 ppm Bi; <3 ppm Zn; <2 ppm As; <10 ppm Ni; < 3 ppm Mg; <5 ppm Cu; <5 ppm Mo; <5 ppm Pb; <10 ppm K; <2 ppm Na; <5 ppm Ca; <3 ppm Fe.
THERMOCHEMISTRY OF ANION MIXTURES IN SIMPLE FUSED SALT SYSTEMS. II. SOLUTIONS OF SOME SALTS OF MO4- AND MO4-2 ANIONS IN THE CORRESPONDING ALKALI NITRATES
Calorimetric measurements were performed on the heats of solution and of dilution of potassium perchlorate in potassium nitrate, of sodium, potassium, rubidium, and cesium perrhenate in the corresponding nitrates, and of sodium sulfate, chromate, and molybdate in sodium nitrate. From the results were derived values of the interaction parameters for the liquid-liquid mixtures, and of the heats of fusion of the considered solutes at the temperatures of the measurements. New, approximate values of the heats of fusion (at the melting points) of the perrhenates and of potassium perchlorate are derived from the measurements. The new interaction parameters are discussed and compared with values previously obtained for the solutions of alkali bromides and chlorides in the nitrates. (auth)
CNC Desktop Vertical Machining Bench Design and Cooling Fluid Application
Today's manufacturing technologies, the human work force is used and at least a minimum level of margin of error is used in CNC machines. Desktop CNC machine tools and CNC machine tools are developed in parallel with the development of personal computers. This study provides CNC training institutions for education, small and medium-sized enterprises for commercial purposes use the low-cost desktop machine has been designing and manufacturing of CNC vertical machining was carried out. Desktop CNC machine tools and production capacity to handle the kind of material was applied to increase the cooling fluid. Through A199 and Fe37 the cooling fluid application desktop CNC machine tools, such as processing of materials that are difficult to successfully processed. Keywords—CNC, Desktop CNC Machine, CNC Design