Caustic soda in metallurgy: copper

Copper and caustic soda

Caustic soda reacts with aluminum, zinc, titanium, but does not react with iron and copper.

To obtain copper oxide, it is necessary to add a hot solution of sodium hydroxide to a warm solution of copper sulfate, and heat the resulting mixture for 5 minutes, until a precipitate is formed.

The use of caustic in the metallurgical industry

To remove deposits, which consist of iron oxides, as well as persistent and complex contaminants in the industry, hydrochloric acid is used with the preliminary application of a sodium hydroxide solution.

For uniform dissolution of alloys, copper is introduced into the electrolyte, dissolved in a sodium hydroxide solution to obtain copper hydroxide.

Copper has a high thermal conductivity and ductility, which allows it to be widely used in industry for the manufacture of wires, heating elements and conductive structures.

Even the smallest impurities reduce properties and corrosion resistance.

Dyeing methods

A solution of caustic soda is used for the preparation of sulfuric liver, for this it is necessary to fuse 1 part of sulfur with two parts of caustic, heating over low heat with continuous stirring, until a homogeneous brown mass is formed, which can later be used for dyeing copper products.

There are several known methods for dyeing copper:

in bluish-black color: 600g / l of caustic soda water + 200g / l of sodium nitrate water at a temperature of 140 ° C, heat for 2 hours;
sodium hydroxide 550 g / liter of water and sodium nitrite 150 g / liter of water at a temperature of 140 ° C - 15-40 minutes;
caustic soda 700 g + soda nitrate 200g + sodium nitrate 50g / liter of water at a temperature of 140 ° C - from 15 to 60 minutes;
caustic 50 g + potassium persulphate 14 g / liter of water at a temperature of 60 ° C for 5-8 minutes.

To color copper in a brownish-yellow tint, it is necessary to combine 50 g / liter of caustic soda water with 8 g of potassium persulfate and heat to 100 ° C for 5 to 20 minutes.

Caustic soda does not react with copper, but at the same time removes corrosion from the surface of copper products, cleans organic deposits and degreases.

A weak sodium hydroxide solution is widely used in antiques for cleaning and restoring copper coins and other items.

caustic copper

Where to buy caustic soda for the metallurgical industry

Our enterprise, in addition to manufacturing microcalcite and marble-based products, supplies caustic soda and other chemical products to our Russian customers directly from manufacturing plants in large bulk quantities. This allows us to provide favorable conditions and quality assurance.

For more details, please contact our managers by filling out an application or calling the sales department.

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