Copper Corundum

A number of different gas, oxide, and metal reference electrodes have been used in molten cryolite. The A1(III)/A1 couple produced by placing molten aluminum in a sintered corundum or boron nitride tube is the traditional reference electrode [33]. However, a CO2/C electrode has also been used. This electrode consists of a graphite-covered copper tube C02 gas is passed through the tube and allowed to bathe the graphite surface while it is immersed in the melt [32]. 

Figure 6 22. High-pressure DTA apparatus of KubaMa and Schneider (75). (u) a. r = coolers. b, n = pyrophillite insulating disk c = heating block d = high-pressure vessel e. m — copper seals f, I = Zr02 blocks g = copper shield h = calorimeter block i = thermocouple k = corundum capillary o = fastening screw p = support c] = in- and outlet of refrigerant. (/ )(i) Open Pt/Ir well In) closed teflon well with brass holder lh = steel-sheathed thermocouple).

Fig. 273. Iron bombs used in the preparation of alkali metal silicides and germanides . 4—bomb for preparation of Rb and Cs compounds 5—bomb for the Na and K compounds, b—Iron bomb h iron screw-on cap t/—corundum crucible —copper gasket I —iron cone.

Cu, Mg, and A1 oxides corundum, copper ore, coal ashes Steam, phenol, air 300 - 1200 NR NR Destruction of evaporated contaminants from coke plant waste-water 53... 

Chenevix obtained chlorine dioxide by the action of sulphuric acid on potassium chlorate, but he did not determine its composition. He analysed corundum and examined the chemical nature of the humours of the eye. Nicolas found phosphate of lime in them, but this was not found by Chenevix or by Berzelius. Chenevix analysed native cuprous oxide ( red octahedral copper ore ) from Cornwall, finding its composition more correctly than Proust (see p. 646), and several other minerals, and examined the magnetism of nickel and cobalt. He criticised the mineralogical systems of Werner and Haiiiy. ... 

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