Manufacturingmethod of active humic acid controlled-release fertilizer

Abstract

The invention discloses a manufacturing method of active humic acid controlled-release fertilizer, comprising the following steps: taking weathered coal or lignite as raw materials; adopting the production equipment of compound fertilizer; taking sodium hydroxide and urea as an activator; in an activating reaction jar, activating and converting humic acid in the weathered coal or lignite by fusedurea liquid and sodium hydroxide to form the urea liquid containing the active humic acid; producing by combing with the compound fertilizer; injecting the urea liquid containing the active humic acid onto the compound fertilizer material in a granulation barrel to round and granulate; and drying, and screening to obtain the black, light and round humic acid controlled-release fertilizer product of different content proportions. In the manufacture scheme, the humic acid urea activating liquid has the following raw materials at the ratio of urea to humic acid to potassium chloride to water tosodium hydroxide of 100:100:(15-200):(5-15):(7-12), and other solid granulation raw materials (comprising urea, monoammonium phosphate, potassium chloride, ammonium sulphate, bentonite and the like) are designed according to nutrient content proportions of different fertilizers. In the manufacture method, humic acid activation and compound fertilizer production are organically combined and are carried out simultaneously, and thus the manufacture method has the characteristics of simple operation process, low cost, large production capability, black, light and round product particle, efficient controlled release of the nutrient, high utilization ratio, wide market prospect and the like, can greatly improve the yield and the quality of crop and improves fertilization soil.

Description

1: Technical field [0001] The invention relates to a method for preparing a humic acid slow-release fertilizer, in particular to a method for making an active humic acid slow-release fertilizer with weathered coal or lignite as raw materials and different active humic acid contents and nutrient contents. Two: background technology [0002] Humic acid has a wide range of uses and has been used in various aspects such as industry, agriculture, medicine, and environmental protection. In terms of fertilizer utilization, as early as the late 1950s, there were reports in foreign countries that combined humic acid and urea to produce fertilizers. In particular, Japan began to nitrate humic acid and urea to produce nitrohumic acid urea in the 1960s. In addition, the former Soviet Union, India, etc. also have similar research. However, industrial production has not been carried out. [0003] my country's humic acid resources are very rich. Since the 1970s, the development of humic a...

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Problems solved by technology

[0005] In order to solve the problem of large pollution and high cost of conventional humic acid activation technology, the present invention provides a production method of active humic acid slow-release fertilizer, and invents the activation of humic acid and organic combination with the production of compound fertilizer, the activation rate of humic acid is high, Low production cost, simple operation process, suitable for existing compound fertilizer enterprises to use existing equipment for large-scale production, and solve the disadvantages of large pollution, high cost and low content of active humic acid in conventional production

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