Device and method for producing sulfur-containing phosphate fertilizer by adding liquid sulfur into gas phase

Abstract

The invention provides a device and a method for producing a sulfur-containing phosphate fertilizer by adding liquid sulfur into a gas phase. The device comprises a granulating machine, a drier, a first gas phase chamber and a cyclone separator which are sequentially connected, the cyclone separator is connected with the granulating machine through a material returning belt, a first liquid sulfur spray nozzle is arranged in the first gas phase chamber, the phosphate fertilizer is granulated and dried, phosphate fertilizer dust is blown into the first gas phase chamber by the drier, liquid sulfur atomized particles sprayed by the first liquid sulfur spray nozzle and the phosphate fertilizer dust are cohered to form sulfur and phosphorus particles, the sulfur and phosphorus particles and the gas phase are simultaneously blown into the cyclone separator, the particles are centrifuged and settle, the sulfur and phosphorus particles are transferred back to the granulating machine, the sulfur and phosphorus particles and a phosphate fertilizer in the granulating machine are mixed to form the sulfur-containing phosphate fertilizer, and the separated gas phase is conveyed to a tail gas absorber and emitted after being absorbed and purified. The device has the advantages of simple process, high granulation rate, fewer returned materials, less dust, safety and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of phosphate fertilizer production, and in particular relates to a device and a method for producing sulfur-containing phosphate fertilizer by adding liquid sulfur into a gas phase. Background technique [0002] Sulfur is one of the main nutrient elements necessary for plants, which can directly provide nutrients to crops, and can also improve the utilization rate of nitrogen and phosphorus by crops, thereby increasing the yield of crops. As agricultural productivity increases, so does the crop's need for all nutrients. Especially with the increase of nitrogen, phosphorus and potassium fertilization levels to meet the needs of high crop yields, sulfur has become the fourth major nutrient element for crops. For many years, sulfur dioxide has been the main source of sulfur required for crop growth. With the reduction of sulfur dioxide emissions year by year, the amount of sulfur that can be provided to crops ...

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Problems solved by technology

[0005] In order to solve the problems that the addition of sulfate in the existing process affects the granulation of ammonium phosphate, the rate of pelleting of ammonium phosphate is reduced, the dust is large, and there are many returned materials, etc., the purpose of the present invention is to provide a kind of equipment that adds liquid sulfur to the gas phase to produce sulfur-containing phosphate fertilizer and methods

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