The continuous method of lead azide manufacture according to Meissner

THE CONTINUOUS METHOD OF LEAD AZIDE MANUFACTURE (ACCORDING TO MEISSNER [110, 111]) 

The method involves introducing a continuous supply of lead nitrate and sodium azide solutions in equivalent proportions into the upper part of the reaction column (Fig. 50) from the bottom of which a suspension of lead azide is removed. The reaction mixture flows down in countercurrent to air blown in. 

Precipitation. In a dissolving vessel a solution of sodium azide is prepared in distilled water and then aqueous sodium hydroxide is added. The quantity of sodium hydroxide used depends on the amount of lead azide to be produced. The solution 

When sufficient lead azide is gathered on one of the suction filters, the liquid from the column is discharged to the second vacuum filter. The lead azide is washed with distilled water until it is no longer alkaline. As soon as sufficient lead azide has been collected on the second suction filter, the liquid discharged from the column 

The crystal structure of the lead azide is checked by examination under a microscope at frequent intervals from the beginning of the precipitation. The lead azide is precipitated as spherical crystals (Fig. 51). 

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The continuous method of lead azide manufacture (according to Meissner) Lead azide with a purity under 95%... 

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