Internally dying method for diammonium phosphate

Abstract

The invention discloses an internally dying method for diammonium phosphate, which comprises the following steps: adding humic acid into phosphoric acid and uniformly stirring to obtain mixed raw materials; adding water soluble coloring agent and color matching agent into the mixed materials; enabling the mixed materials to react with liquid ammonia, so as to obtain diammonium phosphate subjected to internally dying. The internally dying method has the advantages as follows: 1, the cost is low as humic acid is taken as the main raw material for internal dying of diammonium phosphate, and the economic benefit is remarkable as the consumption of the traditional water soluble internal coloring agent is reduced from 3-6 / 1000 per ton to 0.5 / 1000 below per ton and the cost of the products is reduced by 40 yuan per ton; 2, the precise adjustment can be realized and the product color is stable and reliable as the method comprises three internal dying stages, namely roughly underpainting, finely underpainting and hue adjusting; 3, the transmission of nutrition elements to crops is facilitated as the humic acid can be separated and combined with metal ions in water, the crop growth is facilitated as the soil structure can be improved, and the humic acid is used for replacing the traditional colorant to solve the secondary environmental pollution problem of the traditional colorant, so as to achieve great significance in environmental protection.

Description

technical field [0001] The invention relates to an internal dyeing method of diammonium phosphate, which belongs to the technical field of chemical materials. Background technique [0002] Ammonium phosphate compound fertilizers in my country are produced with wet-process phosphoric acid as raw material. Due to the unstable quality of raw phosphate rock, the quality of phosphoric acid fluctuates greatly and the content of impurities varies, which directly affects the unstable appearance and color of ammonium phosphate products. With the use of fertilizers, the color of the product is more unstable, which reduces the market competitiveness of the product, and is even mistaken by farmers as inferior chemical fertilizers. By coloring, especially into dark-colored products, the benefits of masking and unifying the appearance of the product can be achieved. Domestic phosphate and compound fertilizer enterprises all use dyeing agents to dye DAP products, and the most used color ...

AI Technical Summary

Problems solved by technology

[0004] The internal / external colorants used by domestic phosphate and compound fertilizer enterprises are all provided by "COSCO" Group, "Kao" Company and "Amaizi" Company. Heavy metal ions and other harmful impurities have a slow degradation rate and will cause secondary pollution to the environment

Images