Patent GB-447215-A (GB)
Title: An improved process for the production of moulded salt mixtures
IPC: B01J2/00
Filed: 1935-01-21
Abstract: Mixtures of salts which in the presence of water undergo double decomposition and/or give rise to the formation of double salts are converted into stable products by moistening with say 2--8 per cent of water or salt solution, moulding the moistened salt mixture, preferably under high pressure, and allowing the moulded bodies to set to stone hard masses through completion of the reaction between the components of the salt mixture.  The invention is applicable to the production of mixed fertilizers, medicinal products, &c.  The mixture may be brought into the form of grains, tablets, cubes, cylinders, &c., and when small globular agglomerates are formed, they may be spread out in a thin layer or be kept in rolling movement. Slight heating and drying are advantageous.  Large bodies may be broken into granules, which after remoulding with water break up with only a slight pressure. Mixtures of more than two salts may be used, and salts be present which take no part in the reaction.  Moist salts separated from solution may be directly used in the process, and when one salt is hygroscopic the other is preferably used in excess.  In examples, the treatment of mixtures in molecular proportions, of ammonium nitrate, sodium nitrate, or sodium sulphate and potassium chloride is described, and the treatment of mixtures of sodium sulphate and ammonium nitrate, sodium nitrate, or potassium sulphate is also referred to.ALSO:In the production of fertilizers from mixtures of salts which in the presence of water undergo double decomposition and/or give rise to the formation of double salts, the mixtures are converted into stable products by moistening with say 2-8 per cent of water or salt solution, moulding the moistened salt mixture, preferably under high pressure, and allowing the moulded bodies to set to stone hard masses through completion of the reaction between the components of the salt mixture.  The mixture may be brought into the form of grains, tablets, cubes, cylinders, &c., and when small globular agglomerates are formed, they may be spread out in a thin layer or be kept in rolling movement.  Slight heating and drying are advantageous.  Large bodies may be broken into granules, which after remoulding with water break up with only a slight pressure. Mixtures of more than two salts may be used, and salts be present which take no part in the reaction.  Moist salts separated from solution may be directly used in the process, and when one salt is hygroscopic the other is preferably used in excess.  In examples, the treatment of mixtures, in molecular proportions, of ammonium nitrate, sodium nitrate, or sodium sulphate and potassium chloride is described, and the treatment of mixtures of sodium sulphate and ammonium nitrate, sodium nitrate, or potassium sulphate is also referred to.ALSO:In the preparation of medicines from mixtures of salts which in the presence of water undergo double decomposition and/or give rise to the formation of double salts, the mixtures are converted into stable products by moistening with say 2-8 per cent of water or salt solution, moulding the moistened salt mixture, preferably under high pressure, and allowing the moulded bodies to set to stone hard masses through completion of the reaction between the components of the mixture.  The mixture may be brought into the form of grains, tablets, cubes, cylinders, &c., and when small globular agglomerates are formed, they may be spread out in a thin layer or be kept in rolling movement.  Slight heating and drying are advantageous.