Magnesia calcined

Excludes caustic-calcined magnesia used in tiie production of lefiactory magnesia. 

Instead of a closed-bomb reactor, an open reactor (shown in Figure 4.17 B) has also been used for this aluminothermic reduction. The mild steel reactor is lined on the inside with calcined magnesia. An arrangement is made to initiate the reaction in the center of the... 

Black repeated these experiments, using chalk instead of magnesia, and showed in the same way, and with fairly accurate quantitative data, that quicklime differed from chalk in the same way that his calcined magnesia differed from mild magnesia. Although it was not possible to drive off the fixed air from alkalies, to form caustic alkalies, yet he recognized that a similar relation must exist between them, as between chalk and quicksilver. ... 

Dilute 25 cc. of the ammonium citrate solution with water to 250 cc. To 25 cc. of this diluted solution add 3 gm. of calcined magnesia and about 200 cc. of water, and distil, using a receiver containing 40 cc. of semi-normal sulphuric acid. After the distillation titrate the excess of acid with... 

The old phosphorus boxes contained preparations which absorbed moisture from the air with the evolution of heat. The resulting rise of temp, favoured combustion. For example, the mixture of yellow and red phosphorus, and phosphoric and phosphorous oxides and acids, obtained by blowing a jet of air into a flask with some warmed phosphorus, may ignite when exposed to moist air. The phosphoric oxides keep the phosphorus in a fine state of subdivision. J. Pelouze obtained a luminous mixture by melting phosphorus with phosphoric oxide, or calcined magnesia, or lime. M. Saltzer melted phosphorus with about one-third its weight of wax sent a jet of air into the flask until the phosphorus inflamed and then closed the flask. E. Benedix fused a mixture of powdered cork, beeswax, phosphorus, and naphtha. The mass fired spontaneously at 20°, or at a lower temp, if breathed upon. 

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