Method for producing organic-inorganic compound fertilizer by using high tower melting granulation process

Abstract

The invention provides a method for producing an organic-inorganic compound fertilizer by using a high tower melting granulation process. The method comprises the following steps that a pretreated organic raw material enters into a mixer of a high tower and is mixed and cross-linked with molten urine slurry, a nitrogen raw material, a potassium raw material, a filling material, a phosphorus raw material and a functional material, a resultant is activated and is then emulsified in a slurry emulsifying machine, slurry obtained after emulsification directly enters into a high tower granulator for spray granulation and obtained particles undergo the procedures of cooling, screening and surface treatment so as to obtain the high tower organic-inorganic compound fertilizer. The fertilizer contains, by mass, 20 to 30% of organic matters, 30 to 35% of inorganic nutrients and 0.5 to 5.0% of water. The fertilizer prepared by using the method provided in the invention has the following advantages: the particles of the fertilizer are smooth, round and transparent, have high strength and hardly suffer from efflorescence; production process for the fertilizer enables low energy consumption to be realized and is clean and environment friendly, so the fertilizer belongs to the domain of national low carbon agricultural development strategies.

Description

technical field [0001] The invention relates to a method for producing organic-inorganic compound fertilizer by a high-tower melt granulation process. Background technique [0002] In recent years, the long-term excessive application of chemical fertilizers has caused soil compaction, environmental pollution, and the decline in the quality of agricultural products. Coupled with the rapid rise in the price of chemical fertilizers, safe, environmentally friendly, and green organic fertilizers have once again attracted people's attention, and the market demand has continued to increase. [0003] my country has a wide range of organic fertilizer resources, mainly industrial, agricultural, and domestic waste. At present, these three sources of organic matter have not been well utilized. The country produces more than 5 billion tons of various organic wastes every year, which contain a large amount of organic matter and nutrients necessary for plants such as nitrogen and phosphoru...

AI Technical Summary

Problems solved by technology

At present, these three sources of organic matter have not been well utilized. The country produces more than 5 billion tons of various organic wastes every year, which contain a large amount of organic matter and nutrients necessary for plants such as nitrogen and phosphorus, and a large amount of organic fertilizer. Resources are largely discarded and wasted turning into organic waste

[0004] In the prior art, organic-inorganic compound fertilizers are generally produced by conventional rotary drum and disc spray-coating process, which has low production capacity, high energy consumption cost per ton of fertilizer, poor product solubility, high water content, few effective nutrients, and high logistics and transportation costs.

In the prior art, high-tower melt granulation is also used to produce organic-inorganic compound fertilizers. However, due to technical reasons, most of the products produced have an organic matter content of less than 10%, and are still dominated by inorganic nutrients and supplemented by organic nutrients.

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