Hailin Brand Potassium Dihydrogen Phosphate

I. Product Definition and Core Specifications

Potassium dihydrogen phosphate (chemical formula: KH₂PO₄), commonly known as "dihydrogen potassium," is a high-concentration phosphorus-potassium binary compound fertilizer and fine chemical product. The "Hailin" brand products are usually renowned for their high purity.

Its core nutrient indicators are: phosphorus pentoxide (P₂O₅) content ≥ 52%, potassium oxide (K₂O) content ≥ 34%, and total nutrient content exceeding 86%. The product appears as white crystals or powder, with characteristics of full water solubility, chlorine-free, and stable physical and chemical properties. It is recognized as a high-quality and efficient fertilizer and industrial raw material.

II. Production Processes and Quality Grades

Its purity directly determines the application value, and the main production processes determine the grade:

Thermal neutralization process: Produced by the neutralization reaction of high-purity thermal phosphoric acid with potassium hydroxide. Products from this process have the highest purity (often over 99%), extremely low impurity content (such as chlorine, sodium, and heavy metals), and clear solutions without precipitation. They are suitable for high-end agriculture (such as foliar spraying, high-end water-soluble fertilizers) and all industrial fields.

Wet purification process: Uses purified wet phosphoric acid for neutralization with potash. The product purity is slightly lower than that of the thermal process, but it can meet the standard of agricultural premium products through deep purification, with high cost performance. It is the mainstream source for bulk agricultural applications.

Food-grade, industrial-grade, and agricultural-grade products have strict distinctions in hygiene indicators such as heavy metals and arsenic.

III. Key Quality Indicators

In addition to the core nutrient content, the key indicators for measuring its quality include:

Purity: High-quality products have a purity (KH₂PO₄) of 98%-99.5%.

pH value: The pH value of a 1% aqueous solution is approximately 4.4-4.7, showing weak acidity.

Water-insoluble matter: Extremely low content (usually ≤ 0.1%), ensuring complete dissolution.

Impurity limits: Strictly control the content of chloride ions (Cl⁻), sodium ions (Na⁺), heavy metals (calculated as Pb), and arsenic (As). Especially for drip irrigation and foliar spraying, low chlorine and low sodium are crucial.

IV. Main Application Fields

Agricultural field (high-end applications):

Foliar spraying: As an ideal foliar fertilizer, it has high absorption efficiency and can quickly correct crop phosphorus and potassium deficiency symptoms. During the middle and late stages of crop growth, it has significant effects on flower and fruit retention, promoting color change, increasing sweetness, and enhancing stress resistance.

Water and fertilizer integration: It is the core raw material for high-end water-soluble fertilizers used in drip irrigation and sprinkler irrigation, and will not clog drippers.

Seed treatment: Used for seed soaking or dressing, it can improve seed germination rate and seedling vitality.

Key application periods: Widely used in economic crops such as fruits, vegetables, flowers, and medicinal materials before and after flowering, during fruit expansion, and color change stages.

Industrial and special uses:

Buffering agent and culture medium: Used in the preparation of biological culture media and pH buffer solutions, it is a common reagent in microbial fermentation, biopharmaceuticals, and laboratories.

Food industry: Food-grade products are used as quality improvers, chelating agents, fermentation aids, etc.

New energy and electroplating: Used in the preparation of precursors for lithium iron phosphate battery materials, as well as a buffering agent and component in certain metal surface treatment processes.

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