How to select colorants for fertilizer?
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How to select colorants for fertilizer?

Views:7     Author:CHERRY      Publish Time: 2021-02-06      Origin:Site Inquire

How to select colorants for fertilizer?

    ER colorants for fertilizer

According to a large number of studies by ER CHEM, In pursuit of greater economic value, it is popular to dye the fertilizers.The common dyeing fertilizers in market are mainly concentrated in diammonium phosphate, compound fertilizer, potassium chloride, slow and controlled release fertilizers, and water-soluble fertilizers.

Diammonium phosphate is mostly dyed brown, powdered potassium chloride is dyed red, compound fertilizers and slow-release fertilizers are dyed colorful.

1.Purpose of fertilizer coloring


Can be used as a color mark for special and special fertilizers;


Become the anti-counterfeiting mark color of the production enterprise:


Make the fertilizer look more beautiful and have the characteristics of fertilizer:


In the color foliar fertilizer, the color depth is the standard of the fertilizer dilution ratio and concentration, so the color fertilizer is not only beautiful but also has many functions.

2.Requirements for fertilizer coloring

    ♦After dyeing the fertilizer , the color will be very uniform without obvious color difference. For example, yellow compound fertilizer particles have a yellowness between 6-9. The inner and outer colors of the overall colored particles should be consistent, and the surface color of the surface should be uniform.

♦The particle size and specific gravity of the fertilizer are uniform, and the surface is smooth and difficult

Moisture absorption and caking.

♦The colored fertilizer must have a certain light fastness, at least to ensure that the fertilizer does not change color during the storage period.

3. Colorants for fetilizers

   After ER CHEM long time analyze,colorants for fertilizers can be divided into natural colors and synthetic colors according to the source of raw materials,

1) Natural colorants for fertilizers are mainly extracted from plant tissues, some are obtained from animals and microorganisms, and a small amount of inorganic pigments are also included. Natural colors  are safer to the human body, but the tinting strength and sensitivity to light, heat, oxygen, acid and alkali, etc., are poor in stability, have a shorter shelf life, and cost much higher than synthetic colors.






water based


Brilliant green and yellow, strong coloring



Opaque green-yellow, good coloring, super stable in phosphoric acid

ER RED 612


Opaque brilliant red, super colored

ER RED 61571


Economical blue red, super coloring



Opaque blue light red, good coloring

ER BLUE 65151


Red light blue, good coloring, super stable in phosphoric acid

ER BLUE 6515


Red light blue, strong coloring



Opaque blue-green coloring is good, super stable in phosphoric acid

ER RED 612


Opaque bright red, super coloring, super stable in phosphoric acid

ER RED 61122


Opaque brilliant red, super colored



Blue-green, super stable in phosphoric acid



Opaque, super black colored


oil based


Green light yellow, good coloring

ER RED 61122


Super opaque bright red color is good

ER BLUE 6515


Standard red light blue

2) Synthetic colorants are mainly artificially synthesized based on some special chemical groups or chromophores. Generally, they have bright colors, multiple tones, stable performance, convenient use and low production and application costs. They have been rapidly developed since the 19th century.  

4.Addition of fertilizer colorant

Because of the variety of colorants, the classification is complex, there are dyes and pigments, inorganic and organic, water-soluble and oil-soluble, powdered and liquid, and the price per ton ranges from several thousand yuan to tens of thousands of yuan. Ranging from hundreds of thousands of dollars. When choosing to use the fertilizer, the company needs to comprehensively consider the fertilizer product technology, type, adding location and the price of the colorant used, and select the corresponding dye and pigment variety, dosage form and addition amount. Generally, on the premise of ensuring uniform dyeing, the added quality is controlled at 0.2% ~ 0.5%, and the cost is controlled at 20 ~ 30 yuan/t; high-end water-soluble fertilizers and some slow-release fertilizers will choose to use food-grade colorants, and the cost will be more Improved.

5.Attention in coloring

At present, domestic production plants that master this technology can  produce various colored fertilizers with beautiful colors. However, there are not many manufacturers that select ideal colorants and produce colored fertilizers with bright colors and good fastness.

(1) Compound fertilizer is a secondary processing fertilizer produced by matching a variety of basic fertilizers with each other. The composition of various raw materials is different, and the pH is different. The chemical reaction in the production will directly affect

The effect of the colorant, so we must choose a suitable colorant.

(2) In order to obtain bright and beautiful colors, white basic fertilizers and white additives should be used as raw materials as much as possible in the selection of raw materials. Then it is fed into the dusting bucket with a metering screw, and the colorant and powder are sprayed on the surface of the rolling fertilizer particles. This coloring method has poor fastness, uneven coloring, and a large amount of coloring agent, especially the fineness of the powder is required to be about 300 mesh, and the cost is high. The mixing and conveying equipment of the powder and the coloring agent should be added to the equipment.

(3) The fertilizer must be dried by high temperature furnace gas during the drying process. Therefore, the colorant must be able to withstand high temperatures without being damaged.

(4) The drying of domestic chemical fertilizers generally uses coal as fuel. The furnace gas contains carbon dioxide, sulfur dioxide and a large amount of coal ash, which will affect the fastness of the coloring agent and give the fertilizer a black ash.

(5) Various factors should be considered when selecting colorants, especially certain colorants with obvious toxic elements cannot be used. According to the needs of the production product, higher-level colorants should be selected.

(6) According to different production processes, the selection of colorants

(7) There are different differences. For example, when the particle surface is colored, it should be considered that the colorant can be dissolved in the spraying medium to be evenly colored. The surface coloring is the coloring of the product. Therefore, the colorant does not undergo a high temperature process. The main consideration is the uniformity and fastness of the colorant.

(8) The method of adding colorant should be determined according to the process flow.

ER CHEM will choose the most suitable fertilizer colorant for you

With  20 years of experience 
in the manufacturing and supplying of
high performance pigments, ER CHEM 
is dedicated to the R&D.


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