METHOD AND MECHANISM FOR SULFUR-CONTAINING NITROGENOUS FERTILISERS PRODUCTION Russian patent published in 2010 - IPC C05C5/04 

FIELD: agriculture.

SUBSTANCE: calcium nitrate is decomposed in a mixing apparatus with a sulphur-containing compound and the fertiliser is produced by way of resulting gypsum-containing suspension granulation. It proceeds continuously and it is integrated into an installation for complex fertiliser continuous production by nitrophosphate method; the nitrophosphate installation is connected to with an installation for manufacture of calcium-ammonium nitrate from calcium nitrate tetrahydrate; the sulphur-containing nitrogenous fertiliser is manufactured by decomposition of the calcium nitrate tetrahydrate produced in the nitrophosphate installation with sulphuric acid in an ammonisator; otherwise, the sulphur-containing nitrogenous fertiliser is manufactured in the nitrophosphate installation containing at least two ammonisators for neutralisation of a nitrate-phosphate solution by way of decomposition of calcium nitrate tetrahydrate with sulphuric acid in one of the ammonisators. The invention also relates to an installation for the method implementation. As a result it enables to develop a technically simple method of sulphur-containing nitrogenous fertiliser manufacture because the gypsum-containing suspension (produced by way of decomposition) is thinly liquid and therefore easily drained and it also may be treated in traditional granulators.

EFFECT: invention allows to do without a technically complex separation of precipitated gypsum.

7 cl, 3 dwg, 1 ex