One-step neutralization and activation production process containing humic acid diammonium phosphate

Abstract

A one-step neutralization and activation production process containing humic acid diammonium phosphate, which specifically includes the following steps: (1) primary pulverization and drying of weathered coal and lignite, and then secondary pulverization to obtain humic acid mineral powder (HA); (2) Mix and disperse wet-process phosphoric acid and humic acid ore powder, pump them to a tubular reactor to neutralize and concentrate the ammonia gas after gasification of liquid ammonia, and then carry out spray granulation to obtain humic acid phosphoric acid di Ammonium. The invention can be realized directly on the original production line without changing the process, without changing the overall process flow, the addition method is simple and uniform, the product is controllable, the investment is small, the production process is clean, and at the same time, it solves the problems of the tubular reactor in the traditional process. Blockage problem; the proportion of humic acid mineral powder and wet-process phosphoric acid is adjustable, the process is controllable and the product is uniform and stable; the humic acid content of the produced product can reach 1‑3%, which can effectively stimulate plant growth and benefit the sustainable development of agriculture .

Description

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

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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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