What Is Ferrum Phosphoricum?

Iron phosphate, also known as ferric phosphate and iron orthophosphate, has a molecular formula of FePO4, and is a white, off-white monoclinic crystal powder. Is the salt of iron salt solution and sodium phosphate, of which iron is positive trivalent. Its main purpose is to manufacture lithium iron phosphate battery materials, catalysts and ceramics.

Chinese name: Iron phosphate
Foreign name: iron (iii) phosphate

Chinese alias: High iron phosphate, iron orthophosphate
Molecular formula: FePO4

Brief introduction of iron phosphate

Commercial iron phosphate is also called iron orthophosphate. The iron in iron phosphate is trivalent iron, and the majority is dihydrate.

Iron phosphate basic information

Chinese name: ferric phosphate

Chinese alias: high-speed iron phosphate

Iron phosphate

English name: iron (iii) phosphate tetrahydrate

English alias: Ferric phosphate; Ferric orthophosphate; Iron (III) phosphate; iron (3+) phosphate

CAS number: 10045-86-0; 31096-47-6

EINECS number: 233-149-7

Molecular formula: FePO4.2H2O as dihydrate; FePO4 as anhydrous

Molecular weight: 186.82 for dihydrate; 150.82 for anhydrous

Is a salt of iron salt solution and sodium phosphate.

Iron phosphate color traits

The color of high-purity iron phosphate dihydrate is nearly white or light (light) yellow-white powder. With the loss of crystal water, the color gradually turns yellow, and the pure anhydrous substance is yellow-white powder. The appearance of phosphorus (P) in iron phosphate dihydrate when it exceeds the standard is off-white or dark off-white; if iron exceeds the standard, it is dark yellow. The ratio of phosphorus to iron is the most critical index for measuring the quality of iron phosphate, and it is also the most critical factor for determining the quality of lithium iron phosphate. If there is a large amount of divalent iron or sodium, potassium, sulfate, and ammonium ions in iron phosphate, iron phosphate dihydrate appears dark black or off-white. Tap density: 1.13 ~ 1.59g / cm3, bulk density is 0.75 ~ 0.97g / cm3. It is easily soluble in hydrochloric acid when heated, but hardly soluble in other acids, hardly soluble in water, acetic acid and alcohol.

Iron phosphate quality index

Trivalent iron content 29.0% (dihydrate) 36.0% (anhydrous)

Divalent iron content

Sulfate 15ppm

Ammonium (NH) 15ppm

Calcium 50ppm

Mg50ppm

Sodium100ppm

Potassium100ppm

Copper 10ppm

Cadmium

Lead 15ppm

Zinc15ppm

Tap density: 1.13 ~ 1.59g / cm3

Fe: P = 0.97 ~ 1.02 (iron-phosphorus ratio)

Granularity: spherical shape

Particle size: D503-5m

The particle size distribution must be in the range of 0.1 m to 10 m; the maximum particle size cannot be greater than 10 m.

Practical use of iron phosphate

It is mainly used in the manufacture of lithium iron phosphate battery materials; it can also be used as a catalyst and ceramics.

Iron phosphate is one of the few snail killers approved for use in organic agriculture. Unlike previously used Metaldehyde, it is non-toxic to pets and wildlife.

This material is used in steel and metal manufacturing processes. Bonding iron phosphate to the metal surface prevents the metal from being further oxidized. Its existence can partly explain the corrosion resistance of Delhi iron pillars.

Iron phosphate coatings are also mainly used as a base coating to increase adhesion to iron or steel surfaces, and are often used for rust prevention. It can also be used to bond fabric, wood, or other materials to the surface of these materials. Iron phosphate coating is generally used as part of the painting or powder coating process.

Despite its low conductivity, iron phosphate can also be used as an embedded electrode in lithium-ion batteries. However, as materials engineers overcome the conductivity problem, their use as electrode materials has become more and more common in recent years. Because FePO ₄ is thermally stable and generally easier to recycle, it is an ideal electrode material for electric vehicle batteries.

Iron phosphate drying technology

Iron phosphate wet material is generally thick and viscous. Traditional drying technology is difficult to solve, uneven drying and large energy consumption. Many also require vacuum drying technology to prevent excessive temperature. Due to the different conditions of each process, the moisture content of iron phosphate is different, and the requirements for the final moisture content are also different. Microwave drying equipment can meet various requirements. Generally, the purpose of microwave drying can be achieved in ten minutes. At the same time, it can be deep-dried, and the moisture content can reach up to one thousand. Microwave-dried uniformly. Microwave can achieve low-temperature drying. Generally, the drying temperature of materials is about 90 degrees, which solves the problem of drying materials that require vacuum drying under certain process conditions. The process is safe, energy-saving and environmentally friendly. It uses electric energy and is simultaneously dried inside and outside. It is non-contact drying with electromagnetic radiation, which has no pollution to materials and maintains high purity. The temperature of the microwave drying iron phosphate equipment box is below 40 ° C, which improves the working environment of workers.