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Method and improved apparatus for the production of the anhydrous magnesium chloride or chlorides double anhydrous, magnesium
Method and improved apparatus for the production of the anhydrous magnesium chloride or chlorides double anhydrous, magnesium
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机译：制备无水氯化镁或复式无水氯化镁的方法和改进的设备
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152,401. Ashcroft, E. A. July 9, 1919. Magnesium chloride; double chlorides. - Hydrated magnesium chloride is converted into the anhydrous body by partial dehydration in a voluminous current of heated air, preferably dried, until the fusion point is mixed above 150‹ C., followed by treatment with a slow current of hydrochloric acid gas to complete the dehydration; during dehydration, fusion of the mass is to be avoided, and the product obtained is porous if a temperature of 500‹ C is not exceeded, and of a partly crystalline texture if the temperature is allowed to rise to incipient fusion, 650‹ C.; after dehydration the product may be fused. The magnesium chloride is preferably employed in the form of needle crystals such as are obtained by cooling a solution having a strength of 80‹ T., from 50‹ C. to atmospheric temperature. For carrying out the first stage of the process, the apparatus shown in Fig. 1 may be employed. In this, a retort A, C, suitably lagged, contains the material introduced through a lid a2-the larger lid a is for cleaning purposes,-and heated air supplied to a duct E passes into the retort through an annular gap d; the dehydrated material is removed by means of a rotating star wheel F, and is discharged into a churn connected in an airtight manner to the outlet. For the second stage of the process a separate apparatus as shown in Fig. 2 is preferably employed. The partly dehydrated material is introduced into a retort G, Fig. 2, enclosed in a furnace heated by tangential burners K, and comprising body sections G of silica glass and a charging-hopper H and outlet I of cast-iron; the hopper is provided with large and small lids, h, h2 for cleaning and charging respectively, and in the outlet there is a screw or mill L in which any caked lumps are broken up. Hydrochloric acid gas is introduced by a pipe g3 and passes into the annular gap g2 formed by a depending skirt g; after passage through the material the gas is led away by a pipe h3 to a condenser, and the concentrated acid so obtained passed to a generator in which it is liberated for re-use by treatment with concentrated sulphuric acid. The process is applicable to the dehydration of double salts such as carnallite. Specifications 152,402, [Class 41, Electrolysis], 152,403, and 152,879, [Class 41, Electrolysis], are referred to.
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