Activation of brown coal humic acid and preparation method of slow-release coated organic fertilizer thereof

Abstract

The invention discloses activation of brown coal humic acid and a preparation method of slow-release coated organic fertilizer thereof. Oxidation of brown coal is conducted through nitric acid, so that the content of the brown coal humic acid, the number of carboxy group on the surface and the adsorptivity to ammonium ion are improved; biological activation of the brown coal humic acid is conducted through zymin, so that the the brown coal humic acid is degraded into small molecular; by means of ammonium hydroxide, a series of reactions such as condensation, oxidation and degradation are conducted, so that nitridation and dissolution of the brown coal humic acid are conducted; proportioning of the brown coal humic acid after nitridation and dissolution, organic composted fertilizer and inorganic fertilizer are conducted to obtain granules, and the granules are coated by a coating agent made from gelatin, CMC-Na, zeolite powder and soybean oil. According to the method, not only is the slow-release performance of the organic fertilizer improved, but the fertilizer granules are stable, moisture-resistant, easy to transport and of low cost; the use ratio of the brown coal is effectively improved, the brown coal humic acid is degraded into small molecular, the hydrophilia is improved, the fertilizer efficiency is significantly improved, technology is simple, the cost is low, and large-scale production can be conducted.

Description

technical field [0001] The invention relates to the technical field of organic fertilizers, in particular to the activation of lignite humic acid and a method for preparing slow-release coated organic fertilizers. Background technique [0002] my country is a large agricultural country. Crops need to absorb more nutrients during the growth cycle, not only the nitrogen, phosphorus, and potassium that ordinary fertilizers can provide. According to the theory of wooden barrels, if there is a lack of other nutrients, they will not be able to grow normally. The plants are thin and small, the headings are uneven, the pollination rate is low, and the yield is seriously affected. The organic fertilizer has a large content of organic matter and contains a comprehensive range of nutrients, but the content is low, the fertilizer strength is small, the fertilizer supply time is long, the fertilizer effect is slow and durable, and can be fully mixed with the soil. Fusion to form an organic...

AI Technical Summary

Problems solved by technology

However, direct use of lignite to improve soil has low nitrogen content and high acidity. Improper use will hinder the growth of crops and reduce the availability of soil nitrogen. Based on this, we provide a method for activating lignite humic acid, and its production process is simple. , less energy consumption, less pollution, and on the basis of which, a coated fertilizer with slow-release function is prepared, which reduces transportation costs and volatilization, and has good social and economic benefits