Process for producing urea sulfate ammoniated compound fertilizer

Abstract

The invention discloses a process for producing a urea sulfate ammoniated compound fertilizer. The process comprises the following steps of: (1) putting sulfuric acid and urea which are in a mixture ratio into a reaction vessel for producing urea sulfate; (2) preparing a 75% urea sulfate solution from the urea sulfate by using a tail gas washing solution of a pelleting machine; (3) reacting the urea sulfate solution with gas ammonia and steam in a tubular reactor so as to generate a large number of high-temperature high-pressure superheated steam and produce ammonia sulfate and urea molten slurry; (4) loading a fertilizer containing nitrogen, phosphorus and potassium and fillers in the pelleting machine, meanwhile, carrying out atomized spray pelleting on the various materials at a feed port of the pelleting machine by using the ammonia sulfate and the urea molten slurry; (5) feeding a compound fertilizer material obtained after carrying out atomized spray pelleting into the pelleting machine for flowing bonding pelleting; and (6) carrying out twice cooling and twice screening on the compound fertilizer discharged from the pelleting machine to obtain the urea sulfate ammoniated compound fertilizer. According to the invention, the drying and baking procedures are omitted, so that raw materials and energy can be saved, and a product is high in pelletization rate and good in quality.

Description

technical field [0001] The invention relates to a production process of compound fertilizer, in particular to a production process of ammoniated compound fertilizer with urea sulfate. Background technique [0002] With China's entry into the World Trade Organization, it is imperative to adjust the product structure of the compound fertilizer industry. China is a large agricultural country with a large demand for chemical fertilizers, but the domestic chemical fertilizer industry started relatively late. After joining the WTO, large chemical fertilizer companies from Europe, North America and other countries entered the Chinese market aggressively. At the same time, there are many domestic chemical fertilizer manufacturers, and their products are increasingly homogeneous, especially the production technology and research and development of compound fertilizers are still relatively weak. [0003] At present, the traditional main production process of compound fertilizer in my...

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Problems solved by technology

At the same time, there are many domestic chemical fertilizer manufacturers, and their products are increasingly homogeneous, especially the production technology and research and development of compound fertilizers are still relatively weak

[0003] At present, the traditional main production process of compound fertilizer in my country is steam granulation and drum drying. This traditional production process has the following defects: 1. The moisture content of the granulated material is high, the load of the drying system is high, and the heat required for drying is large. , high coal consumption for drying; 2. The tail gas washing liquid is directly discharged as waste water, resulting in a large waste of resources and high raw material consumption; 3. The granulation process requires a large amount of steam, and the boiler coal consumption is high; 4. Exiting the granulator The balling rate of materials is low, the system returns more materials, the equipment load is large, and the power consumption is high; 5. Due to the high temperature required in the drying process, when producing high-nitrogen compound fertilizers, part of the urea is easy to form biuret, and the product is used. Easy to burn crop seeds and roots

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