Explosives . ve figuresby the corresponding molecular weights : for NaCl 585, KC1 7-4-ti. XaXO, 85*1, KX03101-1. 64 EXPLOSIVES The solubilities o£ these different salts in the presence of one another have recentlybeen investigated by J. W. Leather and J. X. Mukerji, whose results do nol differ verygreatly from the above. At temperatures below :>» C, however, they found that aBmall proportion of KC1 is formed in a solution saturated with KNO, and Nad, and aoorresponding amount of solid Ni NO - deposited. At temperatures above 30 C. onthe other hand K(l is deposited and NaNO, formed in soluti
Explosives . ve figuresby the corresponding molecular weights : for NaCl 585, KC1 7-4-ti. XaXO, 85*1, KX03101-1. 64 EXPLOSIVES The solubilities o£ these different salts in the presence of one another have recentlybeen investigated by J. W. Leather and J. X. Mukerji, whose results do nol differ verygreatly from the above. At temperatures below :>» C, however, they found that aBmall proportion of KC1 is formed in a solution saturated with KNO, and Nad, and aoorresponding amount of solid Ni NO - deposited. At temperatures above 30 C. onthe other hand K(l is deposited and NaNO, formed in solution, and as the temperaturethe quantities of these salts increase The liquid ia boiled for half an hour to complete the reaction as far aspossible, then it is run through a filter into shallow cooling tanks ; some morewater may now be added with advantage- to prevent Bodium chloride separatingout with the potassium nitrate. The solution is kept stirred whilst it cools, bo that the potassium nitrate. Fig. 5, Plant for Refining Saltpetre at Waltham Abbey. may separate in small crystals, which do not contain so much mother liquoras large ones. The crystals arc drained and then washed with the liquorsfrom the next crystallization. This ia best done in a centrifugal machine, asthe quantity of washing liquor is thereby reduced to a minimum. The crude saltpetre thus obtained still contain- several per cent, of sodiumchloride and about a half per cent, of magnesium chloride. It is purified bydissolving in the washings of the purified salt, allowing it to crystallize, andwashing with water, whereby the percentage of chloride is reduced to 005per cent. or leas, and the material is rendered practically free from all otherimpurities. Finally it is dried. The sodium chloride formed in the conversion is washed on the filter withliquors containing gradually diminishing amounts of nitrate, until the solidcontains only 0-8 percent, or less. This ? -alt]ictre salt ** then contains abo
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