By T E. Thorpe

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Phite, and the metabisulphite. anhydrous crystals on cooling the solution. The salt only sloAvly oxidises on exposure to air at the ordinary temperature on cautious heating at 80 it loses 1 molecule of SO,, and on further rapid heating evolves sulphur and sulphur dioxide, leaving sodium sulphate Normal sodium sulphite can be prepared in the anhydrous state by heating sodium bisulphite Avith the theoretical amount of sodium bicarbonate or by passing ammonia gas into a solution (Schultz-Sellack, J.

One such furnace decomposes from 72 to 80 tons of salt per week. These furnaces have been successful, and are still at work in the place where they were originally introduced. Another mechanical furnace, composed of two revolving cylinders, is that of A. Walker (Eng. Pat. 9760, 1887). Generally speaking, although mechanical salt-cake furnaces have been used for and have absorbed so much skill so many years j i ! ' and patience in their design, they have not been generally adopted, owing to the fact that their undoubted economy in labour and power of producing a more uniform salt-cake is more than balanced by the higher first cost, cost of repairs, and the difficulties of condensation.

In iron pans. 2*8 parts of infusorial earth are employed for every part of caustic soda, and the resulting water-glass solution has a density of Aqueous solutions, even dilute ones, of sodium about 1*18, the decrease in specific gravity being by alcohol. On treat- due to the dilution produced by the condensed ment with acids, even carbonic acid, the salt is steam. , can the alkaline carbonates and be employed, but the digestion must then be gelatinous silica chlorides, especially ammonium chloride, also continued for a longer time and under 7-8 silicate are precipitated ; precipitate the silica.

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A Dictionary of Applied Chemistry by T E. Thorpe


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