Method for producing compound fertilizer by melting urea fertilizer with heat conducting oil heated cyclically and granulating in high tower

• Main Author: HUANG LANYU
• Format: Patent
• Language: Chinese; English
• Published: 01.08.2012
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERTILISERS; FERTILISERS CHARACTERISED BY THEIR FORM; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MANUFACTURE THEREOF; METALLURGY; MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENTSUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVINGA SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES,SOIL-CONDITIONERS, WETTING AGENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention discloses a method for producing a compound fertilizer by melting urea with heat conducting oil heated cyclically and granulating in a high tower, wherein urea fertilizer meltwater is used as a fluid carrier, is intensively mixed with powdery monoammonium phosphate, potassium chloride or lemery salt, and auxiliary materials in a mixing tank to form slurry, the slurry is dispersed into small liquid drops by a granulating device at the top of a granulating tower, the small liquid drops drop under the effect of the gravity and the buoyancy force, reversely contact cold air from thebottom of the granulating tower to be cooled and solidified and finally freely drop to form compound fertilizer particles by cooling and solidifying. The main point of the method is that the preparation of the urea fertilizer meltwater comprises the following steps of: adding the urea fertilizer into a urea fertilizer melting pot, adding 150-160 DEG C heat conducting oil in the coil pipe of the urea fertilizer melting pot