Preparation Method and Application of Chromium Oxide

Update time : 2023-11-01 14:40:45

Chromium oxide is an inorganic compound with significant application value, and its chemical formula is Cr2O3. Due to its special physical and chemical characteristics, such as high hardness, high melting point, and good chemical stability, chromium oxide has been widely used in many fields.

Technical data of chromium oxide

Name	Fused Cr2O3	EINECS NO.	215-160-9	CAS NO.	1308-38-9
Molecular formula	Cr2O3	Appearance	Black metal Granules or powder
Item	TR-E		TR-H
Cr2O3	≥99%		95-60%
Al2O3	----		5-40%
Fe2O3	≤0.3%		≤0.3%
SiO2	≤0.2%		≤0.3%
Density(g/cm3)	≥5.0		4.4-4.8
Sieve residue(45μm)	≤0.5%	≤0.5%	≤0.2%
Particle size	200mesh, 0-1mm, 2-3mm, 3-4mm, 4-5mm, or customized as needed

1. Physical and chemical properties of chromium oxide
Chromium oxide is a black solid with metallic lustre and a hexagonal crystal structure. Its density is 5.21g/cm3, and its melting point is 2700 ℃. Chromium oxide has a high hardness, comparable to diamond, and has good chemical stability, making it less susceptible to acid and alkali attack. In addition, chromium oxide also has excellent conductivity and thermal stability, making it widely used in fields such as electronics and aerospace.

2. Preparation method of chromium oxide
Oxidation method
The oxidation method is one of the primary methods for preparing chromium oxide. This method involves reacting metal chromium or ferrochrome with oxygen at high temperatures to produce chromium oxide. The reaction equation is 2Cr+O2=2CrO3. The advantages of this method are a simple process and low cost, but it is easy to mix impurities and affect product quality. To improve product quality, techniques such as electrolysis or chemical precipitation can be used for purification.

Chromium hydroxide method
The chromium hydroxide method is another method for preparing chromium oxide. This method involves reacting a chromate solution with an alkaline solution to form chromium hydroxide precipitate, which is then subjected to high-temperature calcination to obtain chromium oxide. The reaction equation is CrO3+2NaOH=Na2CrO4+NaOH. The advantages of this method are high product quality and low cost, but it requires the use of a large amount of alkaline solution, which can easily cause environmental pollution. To reduce environmental pollution, the method of recycling alkali solution or using other more environmentally friendly preparation methods can be used.

Electrolytic method
Electrolysis is one of the methods for preparing high-purity chromium oxide. This method uses metal chromium or ferrochrome as the anode, graphite as the cathode, and the electrolyte as an alkaline or chromate solution. When energized, the metal chromium on the anode is oxidized to trivalent chromium ions, which are then reduced to chromium oxide on the cathode. The advantages of this method are high product purity and low cost, but it requires a large amount of electricity and is therefore not suitable for large-scale production. To improve production efficiency, advanced electrolysis equipment and technology can be used.

3. Application fields of chromium oxide
Ceramic field
Chromium oxide has excellent physical and chemical properties, such as high hardness, melting point, and good chemical stability, making it widely used in ceramics. It can be used as an additive in ceramic glaze to improve the hardness and wear resistance of products. In addition, chromium oxide can also be used in the manufacturing of products such as ceramic cutting tools and cutting tools. With the development of the ceramic industry, the demand for chromium oxide is also constantly increasing.

Glass field
Chromium oxide can be used to manufacture additives such as colourants and shading agents in glass. It can make glass present different colours and shading effects, improving the aesthetics and usability of the product. In addition, chromium oxide can also be used in the manufacturing of optical glass and precision glass products. Due to the increasing demand for glass products, higher needs have been put forward for the quality and performance of chromium oxide.

Electronic field
Chromium oxide has excellent conductivity and thermal stability, making it widely used in the electronic field. It can be used as a coating material and resistance material for electronic components to improve the conductivity and stability of products. In addition, chromium oxide can also be used in fields such as manufacturing battery electrodes and solar cells. With the rapid development of the electronic industry, the demand for chromium oxide is also constantly increasing.
4. Safety protection
Due to the toxicity of chromium oxide, safety precautions need to be taken during use. Protective clothing, gloves, masks, and other protective equipment should be worn to avoid direct touch with the skin or inhalation of dust or gases. In addition, it should be stored in a cool and dry place to avoid direct sunlight and the influence of humid environments. During use, it is necessary to follow the operating procedures to prevent safety accidents strictly.

High-quality chromium oxide supplier
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