Download A Dictionary of Applied Chemistry by T E. Thorpe PDF

By T E. Thorpe

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Care is essential to the life of the pan which depends on the mixture of iron used in the casting, on the strength of the vitriol used, on the design of the pan setting, and, of course, also on the carefulness of the men working the charges. With attention to these points salt- cake-pans will last while the furnaces produce up to 4000 tons of salt-cake. Whether the roaster be an open or a blind one, the work in salt-cake making, as far as the pan is concerned, is almost entirely the same. Only the size of the batches differs in the two With open roasters, which admit of finishing a batch once an hour, or even oftener, batches are made of 6 or 8, or at most 10, cwt.

29. ' ; of fuel required in a special case upon 20 cwts. of salt- folloAVS (calculated The more rapidly heat is generated in the cylinders the less the proportion of that heat which will be lost by radiation. The chemical composition of the salt has been held to materi- ing. ally affect the possible speed of Avorking, and the evidence goes to shoAV that other things being equal the salt containing, the largest quantity of iron salts decomposes the most rapidly. This is the usually accepted explanation of the fact that the output of the same plant using powdered ' rock salt is greater than when using butter salt Avhich contains materially less iron.

Directly calculated, Practically a little more acid must be employed, partly because the mixture can never be theoretically perfect, partly because a little sulphuric acid or anhydride is volatilised, especially in the roaster. c. c. c. c. free acid (calculated as S0 3 ). The first reaction between the ingredients in the salt-cake pot is very violent, and there is a tendency of the mass to rise and to froth over, which is counteracted by throwing in a little tallow. The salt should be dissolved in the vitriol, A ture.

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