Special coloring agent of diammonium phosphate compound fertilizer and preparation method thereof

Abstract

The invention discloses a special coloring agent of a diammonium phosphate compound fertilizer, comprising the following constituents: 40-50 parts of humic acid salt, 0.1-3 parts of carbon soot, 2-4 parts of acid black, 1-2 parts of acid brilliant scarlet, 0.2-1 part of sodium hexametaphosphate, and 40-56.7 parts of water by weight parts; the preparation process is that: the material is prepared by weight parts, water is added in a vertical round reaction tank, and then the humic acid salt, the carbon soot, the acid black and the acid brilliant scarlet are added and are stirred uniformly, andthen sodium hexametaphosphate is added, the mixture is stirred continuously and uniformly, so as to obtain the special coloring agent of the diammonium phosphate compound fertilizer; the invention solves the problems that the diammonium phosphate particles produced under an acid slurry condition are easy to decolorize and the chromaticity is unstable; the special coloring agent of the diammonium phosphate compound fertilizer is green and environmental-protection, has no pollution and is beneficial to the growth of crops; the product is in a liquid state and transported closely, and has convenient usage; the raw material is cheap and easy to obtain, the cost is low and the economic benefit is good.

Description

technical field [0001] The invention relates to a coloring agent, especially an internal coloring agent specially used for diammonium phosphate compound fertilizer. Background technique [0002] Diammonium phosphate (DAP) compound fertilizer has the reputation of "the king of chemical fertilizers". However, due to the use of different phosphate rock raw materials and different neutralization granulation reactors, the color of the produced particles varies between white, gray, beige, and light blue. In order to make diammonium phosphate (DAP) compound fertilizer granules For beautiful appearance, uniform color or color marking for products of different brands, it is necessary to use colorants to transform the particles into colorful appearances such as coffee, golden yellow, green, blue, etc., in order to achieve the above goals. The coloring and anti-caking of diammonium phosphate (DAP) compound fertilizers are often separated. The internal coloring of the product (called i...

AI Technical Summary

Problems solved by technology

[0003] Due to the excessive use of inorganic pigment iron oxide red in the commonly used DAP internal colorant, phosphate complexes are formed after it reacts with phosphoric acid in the pre-neutralized acid slurry, which not only degrades water-soluble P205 into Soluble P205 will also invalidate the iron oxide red as the red matrix, resulting in the dark color of the DAP particles obtained after secondary neutralization granulation, drying and sieving, poor smoothness and roundness, and requires secondary external coloring. Qualified brown DAP particles can be obtained

Not only the colorant consumption is high, but also the process is complicated, and the processing cost is as high as 80 yuan / t product