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Basic chromic sulfate
Name: Basic chromic sulfate
CAS Number: 39380-78-4
Molecular formula: Cr(OH)SO₄
Molecular weight: 343.21
Packing: 25kg/bag
Properties: Industrial basic chromium sulfate is an inorganic compound with the chemical formula Cr(OH)SO4, and it exists in dark green crystals. Its solubility increases with temperature and it can dissolve in water and acidic solutions. Under alkaline conditions, hydrolysis occurs, leading to the formation of Cr(OH)3 precipitate.
Specification
Test Items | Standard indicator (%) HG/T 2678-2015 | Test results(%) |
Cr(OH)SO₄ ≥ | 98 | 98.21 |
Cr₂O₃ ≥ | 24-26 | 26.1 |
Alkalinity≤ | 34 | 33 |
Fe≤ | 0.05 | 0.006 |
Ca≤ | 0.05 | 0.02 |
K≤ | 0.02 | 0.01 |
Al≤ | 0.04 | 0.006 |
water-insoluble≤ | 0.1 | 0.01 |
Preparation
Preparation of chromium sulfate: Reacting chromium powder or chromium ore with concentrated sulfuric acid produces chromium sulfate. The reaction equation is as follows:
Cr+2H2SO4→Cr(SO4)2+2H2O
Preparation of industrial Basic chromic sulfate: Reacting chromium sulfate with sodium hydroxide produces industrial basic chromium sulfate. The reaction equation is as follows:
Cr(SO4)2+2NaOH→Cr(OH)SO4+Na2SO4
Applications
- Electroplating Industry: Industrial basic chromium sulfate serves as a primary component in electroplating solutions, used for chrome plating on metal surfaces to enhance corrosion resistance and decorative features.
- Leather Industry: Industrial basic chromium sulfate is employed in the tanning process of leather, imparting superior softness, durability, and waterproofing properties to the leather.
- Textile Industry: Industrial basic chromium sulfate acts as a mordant in fixing dyes during the textile dyeing process, ensuring colorfastness.
- Dye Industry: Industrial basic chromium sulfate serves as an intermediate in the dye industry, contributing to the synthesis of various organic pigments and dyes.
- Chemical Industry: Industrial basic chromium sulfate is utilized as a chemical raw material in the production of chemicals such as chromium oxide green and potassium chromate.