A Dictionary of Applied Chemistry by T E. Thorpe

By T E. Thorpe

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Burner-gas. The amount was as cake) of reaction. The pyrites burners employed are specially constructed with a view to avoiding radiation and sending the gas as hot as possible into the cylmders. The necessary steam is superheated by the waste heat of the gases, and is usually introduced in the upper part of the burners. The gases are drawn through the whole system by means of a Root's Blower or a castiron fan placed between the cylinders and the acid condensers. By keeping the blower so hot that no liquid acid can be condensed in it, it is protected against the action of the acid ; but the ends of the shaft, passing through the blower, : For heating cylinders For preparing salt For steam .

22) is raised. The work in the roaster must be carried on in such manner that the batch is thoroughly turned over and mixed. The temperature within the furnace should ultimately be a red heat, and no more vapours should be seen rising from the mass. Still, it usually happens that, on drawing the batch out of the furnace, gases are given off (those of sulphuric anhydride being less pungent than those of hydrogen chloride), and, to avoid nuisance, the mass is frequently first drawn into a closed box, where it cools down and is then removed without causing inconvenience.

Salts of the alkaline earths give precipitates of insoluble double silicates. c. of silica. It is prepared on the large scale by two processes, known as the dry and wet methods respectively. In the dry method, a mixture of powdered quartz or white sand and either sodium carbonate or sulphate fused in a Siemen's regenerative furnace or similar gas-fired furnace for 5-8 hours at a is temperature of about 1100. Continuous coalfired furnaces are also in use, which are capable of turning out 1250 kilos, of water-glass in 24 hours with a consumption of 1500 kilos, of coal.

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