Method for producing large granular ammonium sulfate product

Abstract

The invention provides a method for producing a large granular ammonium sulfate product. The method comprises the following steps of: introducing ammonia and sulfuric acid into a crystallizer by using an ammonia inlet and a sulfuric acid inlet on the crystallizer, performing condensation cooling reaction on the ammonia to obtain ammonia water, and reacting the ammonia water with the sulfuric acid to generate an ammonium sulfate mother solution; performing crystallization reaction on the ammonium sulfate mother solution in the crystallizer to obtain an ammonium sulfate crystal mush, wherein an absolute pressure of 9.3-9.7KPa is formed in the crystallizer by using a vacuum pump connected with the crystallizer; and when the volume percentage of ammonium sulfate crystal in the ammonium sulfate crystal mush reaches 25-30%, discharging the ammonium sulfate crystal mush from the crystallizer, thickening, centrifuging and drying to finally obtain an ammonium sulfate crystal, wherein the mass percentage of the sulfuric acid in the crystallizer is controlled to 4-6wt% by using an acidometer in the crystallizer. By adopting the method, the large-granule and low-acidity ammonium sulfate product can be produced with low energy consumption.

Description

technical field [0001] The present invention relates to a kind of production method of large particle ammonium sulfate product, more specifically, the present invention relates to a kind of production method of large particle, low acidity, high quality grade ammonium sulfate product. Background technique [0002] Ammonium sulfate is mainly used as a nitrogen fertilizer in agriculture, and its advantage is that it has relatively low hygroscopicity and is not easy to agglomerate. It is also widely used in industry, such as fermented nitrogen source for enzyme production in medicine, dyeing and printing auxiliary in textile, and refined ammonium sulfate for beer brewing. At present, in the production process of ammonium sulfate, there are still problems such as uneven ammonium sulfate crystal particle size, small average particle size of ammonium sulfate product, and low quality grade. [0003] In the prior art, the method for producing ammonium sulfate mainly includes the pro...

AI Technical Summary

Problems solved by technology

The process of producing ammonium sulfate with spray saturator has the disadvantages of small ammonium sulfate product particle size (less than 1mm), high acidity, and low product quality grade; the process of producing ammonium sulfate with the supporting crystallizer of pickling tower has the disadvantages of large steam consumption, high energy consumption of the system, and Ammonium sulfate products have the disadvantages of small average particle size (less than 1mm) and uneven distribution, high acidity and low product quality

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