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What is aluminum phosphate? What are its uses?

1. What is Aluminium phosphate?

Aluminium phosphate, also known as aluminium monophosphate, is an inorganic salt manufactured from aluminium and phosphoric acid. It is a major inorganic binder in the refractory and ceramics industry. Most often its chemical formula is written as:

AlPO4 (CAS number: 7784-30-7, EC number: 232-056-9, molecular weight ~121.95)

At room temperature, it is a white powdery solid (rhomboid platy crystals). Its natural mineral (berlinite) has the same hexagonal crystal structure as quartz. It has a melting point of more than 1500℃ and a density of about 2.566 g/cm3. Its refractive index is 1.546. Insoluble in water and alcohol, slightly soluble in hydrochloric and nitric acids. Aluminium phosphate has a high melting point, high thermal stability, good refractoriness and wear resistance. It is obtained industrially by reaction of aluminium salts with phosphates, or by acidification of sodium aluminate solution with concentrated phosphoric acid. It is also widely used as a colloidal hydrate (AlPO4.xH2O.

Aluminium phosphate has a structure based on aluminium ions (Al3+) and phosphate ions (PO43-). Its Al-OP framework has an isoelectronic similar structure as silicon dioxide (SiO2), so it has excellent high-temperature resistance, chemical stability and structural diversity: it is a strong binder at high temperature and also a molecular sieve framework with designable channels (AlPO4 molecular sieve series), so it is a multifunctional material of "high-temperature binding + catalytic support".

Aluminium phosphate is chemically stable, insoluble in water and alcohol, resistant to acid and alkali corrosion (slightly soluble in strong acids), does not decompose at high temperatures, has good compatibility with many inorganic materials, and is non-toxic and non-irritating. It should be stored in a sealed container, moisture-proof.

The product is categorised by application area, which generally includes: industrial grade (for industrial applications such as refractories, glass ceramics, catalyst supports, and coatings) and reagent grade (for laboratory use). The requirements for impurity control are different for different grades. The following indicators are especially noted:

1. Aluminium oxide (Al2O3)

Alumina content determines high-temperature performance and bonding strength, and together with phosphate content, is the core indicator of product composition.

2.P2O5 (phosphorus pentoxide) content

The content of phosphorus pentoxide is an indicator of the phosphate content, which influences the acidity and catalytic activity of the binder and must be strictly controlled.

3. Loss on ignition and moisture

Moisture impacts the formulation and shelf-life of binders. The loss on ignition shows the water of crystallisation and volatile components; both must be maintained within a reasonable range.

4. Fineness (residue on 325 mesh screen)

The fineness influences the dispersibility of the binder and the size of the coating particles and should be controlled depending on the application requirements and for batch-to-batch consistency.

5. Water insoluble matter and iron content

Water insoluble matter reflects the total load of impurities and the iron content influences the colour of product and performance of catalyst . Both of them should be controlled in a reasonable range .

II. What are the uses of Aluminium phosphate?

Aluminium phosphate is used in many fields such as refractory materials, glass ceramics, petrochemicals, coatings, building materials, electronics, dentistry, and laboratories due to its unique properties of 'high melting point, high thermal stability, and Al-OP skeleton'. All of its applications are listed below by application area and product (nothing omitted):

1. Binder of refractory material (core industrial application in the area of refractory materials).

Aluminium phosphate is used as a binder in refractory bricks, refractory castables, ceramic fibre products and in lining of high temperature furnaces. Widely used in the electrical industry, high temperature furnaces, heat treatment furnaces and kiln equipment to enable refractory materials to retain their strength and integrity at high temperatures. It is one of the most important binders in refractory material field.

2.Glass flux (core industrial application in the glass industry)

Aluminium phosphate is employed as a flux in the production of speciality glasses to lower the glass's melting temperature and enhance its properties. It is used in the production of speciality glasses, opaque glasses and optical glasses.

3. Ceramic adhesives (industrial grade, ceramics industry)

Aluminium phosphate is used as a binder in ceramic bodies, glazes and ceramic products. It helps ceramic products retain strength during moulding and firing. It is widely used for ceramic tiles, sanitary ware and industrial ceramics.

4. Dental cement (industrial grade, in the dental field)

Aluminium phosphate is used as a component of dental cement (cementing agent) to help dental restorations (crowns, bridges) to bond to teeth and is one of the commonly used materials in dental restorative treatment.

5. Catalyst carrier (core industrial application, petrochemical industry)

Aluminium phosphate is used as a starting material for AlPO4 molecular sieve series and aluminium phosphate supports. It serves as a support for petrochemical catalysts and as a catalyst for reactions such as isomerisation and dehydration, thus improving the selectivity and yield of reactions. It is an important material in oil refining and chemical catalysis.

6. Pigments for rust prevention (industrial grade, coating industry)

Ultrafine aluminium phosphate (aluminium tripolyphosphate) is used as an anticorrosive pigment in anticorrosive paints. It helps to release the anti-rust groups with strong coordination ability and passivates the metal surfaces. It is widely used as an anti-rust primer for steel structures, cars and ships.

7.Fire retardant coatings and fire retardant textiles (industrial grade fire protection and flame retardant applications)

Aluminium phosphate is used as flame retardant in fire retardant coatings and fire retardant textiles to improve the flame resistance and fire rating of materials. It is widely used in fire-retardant coatings, fire-retardant fabrics, and flame-retardant products for buildings.

8. Conductive cement additive (building materials industry, industrial grade)

Additive of aluminium phosphate in conductive cement and speciality cement to improve the structural properties and electrical conductivity of cement for use in speciality building materials and engineering applications.

9.Friction materials and diaphragm materials (industrial materials field, industrial grade)

Aluminium phosphate is used as a substitute for asbestos, as a friction material (brake pads) and battery separator material, and improves the heat resistance and mechanical properties of the material.

10. Thermal insulation and reinforcement materials (thermal insulation materials, industrial)

Aluminium phosphate is used in thermal insulation materials, reinforcing materials, and thermal insulation coatings to improve the heat resistance and structural strength of materials, and is used in the fields of thermal insulation, energy conservation, and high-temperature protection.

11.Piezoelectric materials (electronic materials, industrial grade)

Aluminium phosphate crystals have piezoelectric properties similar to quartz and are used as piezoelectric materials for frequency control and sensing in electronic devices.

12. Catalysts for synthesis of organic compounds (fine chemicals industry, industrial grade)

Aluminium phosphate is used as a catalyst in organic production reactions, helping with the catalysis of reactions such as dehydration and esterification, thus serving the fine chemical and intermediate industries.

13.Textile stain resistant agent (industrial grade, textile industry)

Aluminium phosphate is used in the textile industry as a stain-resistant to improve the stain resistance of fabrics and to serve the textile finishing industry.

14. Paper production additives (industrial quality, for paper industry)

Aluminium phosphate is used as an additive in the paper industry to improve the properties of paper and processing techniques.

15.Emollient additives (daily chemical industry, industrial grade)

Aluminium phosphate is used as an additive component in emollients (skincare products) to improve the skin feel and performance of the product. It is used in the daily chemical industry.

16. Reagent-grade applications in laboratory (fields of research and analysis, core reagent-grade applications)

Reagent grade aluminium phosphate is a chemical reagent and analytical raw material for laboratory research of AlPO4 molecular sieve synthesis, phosphate chemistry research and sample analysis, used in scientific research and quality testing.

Respiratory irritation may result from industrial dust. Note: Aluminium phosphate is non-toxic. Wear protective equipment and ensure proper ventilation during operation. Consumption of raw material for any grade product is strictly prohibited and waste shall be disposed off as per regulations.

Summary

Aluminium phosphate (AlPO4, CAS No. 7784-30-7, EC No. 232-056-9) is a white powder solid, melting point >1500℃. It is insoluble in water and has high melting point, high thermal stability and Al-OP framework, so it is widely used in refractory materials, glass ceramics, petrochemicals, coatings, building materials, electronics, dentistry, laboratories and other fields. Aluminium phosphate is found in everyday products such as high temperature resistant products, ceramic and glass products, petrochemical products, protective coatings, dental materials and laboratory testing. Aluminium phosphate is widely used as refractory material binder, glass flux, ceramic adhesive, dental cement, catalyst carrier, rust preventive pigment, fire retardant coating and fire retardant textile, conductive cement additive, friction material and diaphragm material, thermal insulation and reinforcing material, piezoelectric material, organic production catalyst, textile stain resistant agent, papermaking additive, skin moisturising additive, reagent grade in the laboratory. It is a versatile high temperature inorganic material that bridges "phosphate chemistry" with "refractory materials, glass and ceramics, petrochemicals, coatings, building materials, electronics, dentistry and scientific research."