Improved method for preparing sulfur base fertilizer

• Main Authors: WANG YUNCHAO, LIU HONGKUI, MA KAI, WANG JINMING, XIAO ZHANMEI, ZHENG XIUXING, CHANG BIZHUANG, WANG LILONG, SONG ANXIN
• Format: Patent
• Language: Chinese; English
• Published: 19.09.2012
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERTILISERS; FERTILISERS CHARACTERISED BY THEIR FORM; FERTILISERS PRODUCING CARBON DIOXIDE; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; 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; PHOSPHATIC FERTILISERS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention relates to an improved method for preparing sulfur base fertilizer, which belongs to the field of producing compound fertilizer. The method comprises that: (1) concentrated sulfuric acid is added to a falling-film absorption tower, is preheated and then flows into a conversion tank; potassium chloride is directly added to the conversion tank, supplied with steam and subjected to dechlorination conversion reaction; and dechlorination products overflow to an acid-mixing groove; (2) generated hydrogen chloride gas is cooled, absorbed and turned into hydrochloric acid; (3) phosphoric acid is preheated sequentially through the falling-film absorption tower and a graphite heat exchanger, added to the acid-mixing groove and mixed with the dechlorination products to form mixed acid slurry; or common industrial water is preheated sequentially through the falling-film absorption tower and the graphite heat exchanger and then added to the acid-mixing groove, and monoammonium phosphate is directly added to