Basic Chromium Sulfate

Description:

Chromium sulfate, also known as chromium(III) sulfate or chromic sulfate, is a chemical compound with the formula Cr2(SO4)3. It is a violet to green crystalline solid that is soluble in water. Chromium sulfate is typically encountered as the dodecahydrate, Cr2(SO4)3·12H2O. It is used in various industrial applications, including the tanning of leather, textile dyeing, and as a mordant in dyeing and printing fabrics. Additionally, it has applications in the manufacture of inorganic pigments, catalysts, and corrosion inhibitors.

Specification:

Purity: Basic chromium sulfate is commonly available with purities ranging from 24% to 36% chromium oxide (Cr2O3).

Insoluble Matter: Specification may include limits on insoluble matter.

Hydration State: Specifications may vary based on the hydration state of the compound.

Impurities: Common impurities may include traces of other metal ions.

Packaging: It is usually packaged in bags or drums suitable for storage and transportation.

Application:

Tanning Industry: Basic chromium sulfate, also known as chrome tanning agent or chrome alum, is primarily used in the leather tanning industry. It acts as a mordant, effectively fixing the chromium ions to the collagen fibers in the leather, resulting in a durable and water-resistant material.

Textile Industry: It can be utilized in the textile industry as a mordant for dyeing fabrics and fibers. It helps to improve the color fastness and brightness of the dyes.

Surface Treatment: Basic chromium sulfate is employed in surface treatment processes, such as chromate conversion coating, for corrosion protection of metals like aluminum and steel. The chromium compounds formed on the metal surface provide a barrier against corrosion.

Wood Preservation: It is used in wood preservation treatments to protect wood against decay and insect infestation. The chromium compounds penetrate the wood fibers, providing long-lasting protection.

Electroplating: In some cases, basic chromium sulfate can be used in electroplating processes for depositing a chromium layer onto metal surfaces. This chromium layer provides enhanced corrosion resistance, durability, and aesthetic appeal.

Other Industrial Applications: Basic chromium sulfate may find application in various other industrial processes, including the production of catalysts, pigments, and specialty chemicals.

These applications highlight the importance of basic chromium sulfate in various industries, particularly in leather tanning, where it is a crucial component for producing high-quality leather products.