Humic-acid-containing diammonium phosphate neutralization and activation one-step production technology

Abstract

The invention discloses a humic-acid-containing diammonium phosphate neutralization and activation one-step production technology which particularly includes the steps: (1) primarily crushing and drying weathered coal and brown coal and then secondarily crushing the coal to obtain humic acid mineral powder (HA); (2) mixing and dispersing wet-process phosphoric acid and the humic acid mineral powder, pumping the wet-process phosphoric acid and the humic acid mineral powder to a tubular reactor, neutralizing and concentrating the wet-process phosphoric acid, the humic acid mineral powder and ammonia gas formed after liquid ammonia gasification, and then performing slurry-spraying granulation to obtain humic-acid-containing diammonium phosphate. The production technology can be directly implemented on an original production line without changing the technology or changing overall technological process, an adding method is simple and uniform, products are controllable, investment is less,the production process is clean, and the problem of blockage of a tubular reactor in a traditional technology is solved. The batching proportion of the humic acid mineral powder and the wet-process phosphoric acid can be adjusted, and the technology controllable products are uniform and stable. The humic acid content of the produced products can reach 1-3%, plant growths can be effectively stimulated, and agricultural sustainable development is facilitated.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a one-step neutralization and activation production process containing humic acid diammonium phosphate. Background technique [0002] Humic acid widely exists in soil, peat, lignite, and weathered coal. It is an organic matter formed by animal and plant debris through microbial decomposition and a series of geophysical and chemical processes. It has the following characteristics: It can regulate soil water, fertilizer, gas, and heat. conditions, reduce soil bulk density, increase soil porosity, and form aggregate structures with good water stability; create a suitable living and breeding environment for soil microorganisms, and significantly improve soil organic matter regeneration and immunity (eliminate harmful bacteria, reduce pesticide toxicity) and soil self-repair ability; promote early germination of seeds, high emergence rate, especially at low temperature; can stimulate the di...

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Problems solved by technology

[0013] (2) Due to the different origins of phosphate rock, a large amount of insoluble phosphate will be generated in the production of low-grade phosphate rock or high-grade phosphate rock with high metal ion content, which will cause obstacles to the production process and reduce product quality, limiting the use of low-grade ore Utilization, a large amount of tailings and slag are produced to waste resources and put pressure on the environment

[0014] The current technical level and existing problems of coating DAP: (1) Most of the coatings on the market are resin-coated DAP. Although the resin is degradable, most of them are insoluble. It can only play a slow-release role. After phosphorus seeps out of the film coating, it still first contacts with the soil and combines with minerals. A small part can be absorbed by plants and cannot improve the utilization rate of phosphorus; (2) the coating diammonium is in the In the dry season of early spring, the soil moisture is low and the film cannot be opened, so that the plant seedlings will be dephosphorized at an early stage, so that the early seedlings will not be strange, and the growth will be inhibited; if the fertilizer effect is too long in the harvest period, the plants will be greedy and reduce production.

[0015] A patented high-efficiency humic acid diammonium phosphate preparation process uses 30% to 50% ammonium humate as the activator. Leaving aside the problem of the wrong concept of the activator, it is very difficult to achieve such a high content of ammonium humate , the current production process of ammonium humate is roughly divided into two types, one is the solid state mixing of ammonium bicarbonate and weathered coal or lignite powder, stacking belongs to solid activation, and the yield of ammonium humate in this activation method is only 10%-20 %, which does not meet the requirements at all, and is basically abandoned in the industry; the other is to use ammonia water to activate in the liquid phase, and the activation yield is up to 30%, but it needs to be dried, and a large amount of ammonia will volatilize during the production process 1. The storage stability of the products of the two methods is extremely poor, and the ammonia smell is extremely strong. Even if it is realized, it will have a great impact on the production environment; The material, that is, the returned material with unqualified particle size belongs to the automatic return material broken in the drum, and it is difficult to add in this process

The other kind of return material is spray gun reflux return material. In this material tank, there is concentrated slurry. The density is very high and there is a density difference between ammonium humate. It is difficult to add evenly in the return material, which will cause the content of humic acid in the product. Uneven, affecting product quality

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