公开(公告)号：US3429686A

公开(公告)日：1969-02-25

申请号：US3429686D

申请日：1964-10-13

Applicant: STAMICARBON

Inventor： DINGEMANS SIMON ,  SLOT WILLEM

IPC: C05B7/00 ,  C05B11/06

CPC classification number: C05B7/00 ,  C05B11/06 ,  C05B11/08 ,  C05C1/00 ,  C05C5/02

公开(公告)号：US3600154A

公开(公告)日：1971-08-17

申请号：US3600154D

申请日：1969-02-28

Applicant: STAMICARBON

Inventor： SLOT WILLEM ,  LOGEMANN JOHAN D

IPC: C05B11/06

CPC classification number: C05B11/06 ,  C05B11/08

Abstract: AN IMPROVED PROCESS FOR THE CONTINUOUS PREPARATION OF A NITROPHOSPHATE FERTILIZER WHEREIN PHOSPHATE ROCK IS DECOMPOSED IN AN AQUEOUS SOLUTION CONTAINING SUFFICIENT NITRIC ACID TO DISSOLVE THE PHOSPHATE ROCK, SULPHURIC ACID IS THEN ADDED TO THE SOLUTION IN A SUFFICIENT AMOUNT TO PRECIPITATE GYPSUM WITH THE SIMULTANEOUS REFORMATION OF NITRIC ACID, ADDITIONAL PHOSPHATE ROCK IS THEN ADDED TO THE SOLUTION AND DISSOLVED BY THE REFORMED NITRIC ACID, AMMONIUM SULPHATE IS THEN ADDED TO

THE SOLUTION TO REACT WITH THE DISSOLVED CALCIUM IONS OBTAINED IN DISSOLVING THE ADDITIONAL PHOSPHATE ROCK, THEREBY PRECIPITATING ADDITIONAL GYPSUM, THE PRECIPITATED GYPSUM IS THEN SEPARATED FROM THE SOLUTION, AND THE GYPSUM-FREE SOLUTION IS THEN NEUTRALIZED WITH AMMONIA AND EVAPORATED TO DRYNESS TO FORM A SOLID FERTILIZER COMPOSITION.