Definition and Usage Areas of Nickel Sulfate

At least seven sulfate salts (II) of nickel Sulfate are known. These salts differ in hydration or crystal habits.

The common tetragon hexahydrate crystallizes from aqueous solution between 30.7 and 53.8 °C. Below these temperatures, a heptahydrate crystallizes and above these temperatures an orthorhombic hexahexide is formed. NiSO4, the yellow anhydrous form, is a high melting solid that is rarely encountered in the laboratory. This material is produced by heating hydrates above 330°C. At higher temperatures it decomposes into nickel oxide.

Salt is usually obtained as a byproduct of copper refining. It is also produced by melting nickel metal or nickel oxides into sulfuric acid.

Aqueous solutions of nickel sulfate react with sodium carbonate to precipitate nickel carbonate, a precursor to nickel-based catalysts and pigments. Addition of ammonium sulfate to concentrated aqueous solutions of nickel sulfate causes precipitation of Ni (NH4) 2 (SO4) 2 6H2O.

Nickel sulfate occurs as the rare mineral retgersite, a hexahydrate. The second hexahydrate is known as nickel hexahydride (Ni, Mg, Fe) SO 4 6H 2 O. The heptahydrate, which is relatively unstable in air, occurs as morenosite.

Usage areas

• Imitation jewelry (Necklace, necklace, earrings, bracelet, ring).
• There is no nickel in gold and silver jewelry over 12 carats, there is nickel in gold and white gold in lower carats)
• Clothing accessories (metal button, zipper, underwear hook, belt buckle, …)
• Many items used in daily life (coins, keys, key chains, pens, fountain pens, lighters, purse handles, umbrellas, curlers, hair clips, eyeglasses frame, lipstick case, powder holder, pins, safety pins, sewing needles, scissors, nails, hammer, screwdriver…).
• Metal parts of furniture, door and window handles, stair handrails, metal chairs,
• Rarely eye cosmetics.