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Uses Of Caustic Soda in Metal Industries

   February 02, 2021

Caustic soda flake is one of the significant industrial chemicals. This inorganic chemical in pure form is widely found as a white solid granules, flakes, or pellets. Caustic soda is a versatile alkaline which found application in multiple industries.. Pulp, paper, alumina, soap and detergents, oil processing, and chemical manufacturing are key applications of these products. Other important uses include metal processing, water processing, food processing, clothes, construction, glass processing, etc. The demand for caustic soda in a country follows GDP growth of the country.

The pulp and paper industry is one of the major caustic soda flakes consumers, where pulping and blanketing are used, waste paper de-contaminated, and water treatment is carried out with the help of caustic soda. Also, caustic soda has hundreds of medicinal applications, including the manufacturing of aspirin and high cholesterol and blood dissipaters

Niche applications of Caustic Soda in Metal Industries are as follows:

Extraction of Aluminum 

Alumina, an aluminum derivative, is extracted with the help of caustic soda flakes from minerals – particularly from bauxite. The alumina is then refined into aluminum used in the construction, construction aluminum foil, lightweight planes, beer cans, and kitchen utensils.

Acidic Pickling or Aluminum Etching 

Caustic soda (NaOH) is mainly used for acidic pickling or aluminum etching. Sodium aluminate (NaAlO2) dissolves in the sodium hydroxide solution due to chemical etching. At 80 ° C (176 ° F), chemical etching's process temperature is normally finished.

Dissolving Metals

Tin, Aluminium, and zinc cadmium act similarly to zinc that everything still relates to it. Chromium plating and copper may both be under threat, but ammonia is much stronger at dissolving copper:

It would then strike and, if not dissolve entirely, then surely degrade the brazing and soft solder joints. The reaction of certain metals produces hydrogen gas. Sodium hydroxide will not react with iron or steel; in particular, alkaline conditions will not cause rust to grow; black magnetic oxide will grow in its continued use of alkaline sodium nitrate solutions for hot blue baths if you make the conditions oxidizing.

Keeping Steel Clean

Holding it in a caustic soda flakes solution or solid, freshly cut, or polished steel can be kept bright for short periods. If you can create electrical contact between aluminium or zinc and rusty iron and then place them in sodium hydroxide, at least some of the rust on iron metal loose black powder will be minimized by the electrolytic reaction, and it will be much easier to remove.

By adding your work to the negative (black) lead of a battery charger and a piece of scrap to the red lead, you can get the same result, much more controllable, and submerge all bits for a day or two in the hydroxide solution. If you use galvanized metal for the positive (red) electrode and the zinc plates, the job will melt the zinc again, only leaving it in the solution with the electricity turned off.

The ability to dissolve fats and organic material makes sodium hydroxide an effective paint stripper, and degreaser is much less unpleasant to use than ammonia. Still, rinsing is necessary to extract sodium hydroxide, while ammonia solution only evaporates, although unless rinsed, any soap it produces will stay behind.


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