Organic water soluble carbon fertilizer and preparation method thereof

Abstract

The invention relates to the technical field of water soluble organic fertilizers, and in particular relates to an organic water soluble carbon fertilizer and a preparation method thereof. The carbon fertilizer is prepared from the following raw materials: humic acid, sodium oxide, nitric acid, phosphorus pentoxide, urea, boric acid, zinc sulfate, potassium oxide, a fluid loss additive, and a suspending agent. In the preparation method, humic acid reacts with sodium oxide and then carries out nitration with nitric acid to obtain nitrohumic acid sodium salt, the fluid loss additive is added into the nitrohumic acid sodium salt, so that phosphorus pentoxide can be added in a slurry environment to carry out the subsequent chelation of multiple nutritional elements, and the shortcoming of grafting reaction with phosphorus pentoxide in a solid-state kneading manner in the prior art, in which the intermediate material is needed to be air-dried, is overcame. The entire reaction process is a full slurry reaction, continuous feeding and full-automatic production are realized, the technological process is simple, and the production efficiency is high. In addition, nitration and chelation are carried out in two reaction vessels, respectively, and the entire process can realize continuous circulating production, so as to reduce production cost.

Description

technical field [0001] The invention relates to the technical field of water-soluble organic fertilizers, in particular to an organic water-soluble carbon fertilizer and a preparation method thereof. Background technique [0002] Humic acid is mainly the remains of animals and plants. After microbial decomposition and transformation, as well as a series of geochemical reaction processes and accumulation, it is a kind of complex natural organic matter. It widely exists in soil, peat, lignite, and weathered coal. Humic acid contains various functional groups such as phenolic hydroxyl group, enol group, sulfonic acid group, amino group, quinone group, methoxy group and carboxyl group, as well as a small amount of amino acids, vitamins and enzymes. The main constituent elements are C, H, O, N and S. Because there are many active functional groups in the molecule, it has acidity, hydrophilicity, interface activity, cation exchange ability, complexation (chelation) effect, adsorp...

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Problems solved by technology

[0003] It is precisely because of the above-mentioned effects of humic acid that more and more organic fertilizers based on humic acid are appearing on the market, but most of the organic fertilizers based on humic acid are relatively poor in water solubility. It is good to play the role of humic acid, and therefore people research and develop humic acid water-soluble fertilizers. For example, Chinese patent CN102276300A discloses a full-priced organic fertilizer for drip irrigation and its preparation method. In this method, organic matter (The main component is humic acid) react with sodium salt and nitric acid to improve the water solubility of humic acid, then add phosphorus pentoxide to further improve the water solubility of humic acid, graft phosphorus elements, and then add liquid ammonia to supplement nitrogen However, due to the strong dehydration effect of phosphorus pentoxide, if the humic acid reacted with nitric acid is directly contacted with phosphorus pentoxide, it will cause its intramolecular dehydration, resulting in complexation and precipitation of humate. , reduce the water solubility of humic acid, and it will also be accompanied by a large amount of heat release. In the actual production process, there will be safety hazards such as slurry or particle disintegration, which makes it impossible to directly add phosphorus pentoxide to the slurry of humic acid nitration reaction In the process, it is necessary to knead with phosphorus pentoxide in a kneader after drying the material after the nitration reaction, the industrial process is tedious, and the grafting rate of phosphorus pentoxide is very low under semi-solid kneading reaction conditions Part of phosphorus pentoxide still exists alone in the fertilizer and cannot be combined with humic acid, so that the phosphorus element in the prepared fertilizer cannot be well utilized, and the water solubility of the fertilizer is also relatively poor. There is a phenomenon of flocculation and agglomeration to block the pipeline, and the performance is poor