Platinum Refining: From Leaching to Roasting | Gold and silver electrolysis Platinum palladium rhodium ruthenium osmium refining-zhengzhou jinquan

Platinum Refining: From Leaching to Roasting

Platinum refining involves a series of steps to obtain high-purity platinum.

Here's a concise overview:

1.Leaching: Platinum and other metals are dissolved in a solution with strong oxidants

like aqua regia and NaClO3. Silver forms a precipitate while platinum dissolves. Reaction:

$3 Pt + 2 NaClO_{3} + 18 HCl \to 3 H_{2} PtCl_{6} + 2 NaCl + 6 H_{2} O$

2.Neutralization: Adjust the high-acidity leaching solution to pH 1 using NaOH and wash

the residue with hydrochloric acid.Platinum Refining: From Leaching to Roasting

3.Platinum Precipitation: Add ammonium chloride to the solution until no more yellow

precipitate forms. Then, cool, filter, and wash the residue with 10% ammonium chloride. Reaction:

$H_{2} PtCl_{6} + 2 NH_{4} Cl \to (NH_{4})_{2} PtCl_{6} ↓ + 2 HCl$

4.Roasting: Heat the filtered residue to decompose ammonium chloroplatinate into sponge

platinum. Repeat chlorination, neutralization, and roasting until pure platinum powder is obtained.

$(NH_{4})_{2} PtCl_{6} Heating 3 Pt + 2 NH_{4} Cl + 16 HCl + 2 N_{2} ↑$

Platinum refining is critical for various industrial applications, ensuring the metal's purity and quality.

Equipment needed for platinum refining: reactors and other anti-corrosion chemical equipment.

Platinum Refining: From Leaching to Roasting，learn more

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