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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:

Preparation of industrial Basic chromic sulfate: Reacting chromium sulfate with sodium hydroxide produces industrial basic chromium sulfate. The reaction equation is as follows:

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.