ZINC CHLORIDE (ZnCl2)

Zinc chloride is one of the important zinc componds. It is stable in the vapour phase upto 900oC. It is very hygroscopic, extremely  water soluble, and soluble in organic liquids such  as alcohols, esters, ketones,ethers, amides and mitrictes.  Hydrates with  1,  1.5,  2.5,  3,  and 4  molecules  of  water  have  been identified and great care must be expressed to avoid hydration of the anhydrous form.

Aqueous  solution of zinc chloride are  acidic  (pH=1.O for  6  m ),and when partially neutralized form  slighly  soluble basic chlorides eg. Zncl2 and 4 Zn( ch)2 and Zn(ch)cl  many other basic chlorides have been reported.

Zinc  Chloride (Zn Cl2) is available as  white,  crystalline powder, odourless, moulded in pencils or porcelains like mass.

Zinc Chloride is obtained by heating zinc with dry  chlorine gas,  by  the action of hydrochloric acid on Zinc  Oxide,  or  by heating a mixture of Zinc Sulphate and Sodium Chloride.

Zinc chloride is an industrially important compound of Zinc. In aqueous solution, it may be used alone or in combination  with phenol  or  sodium chromate as a wood  preservative  for  railway sleepers  poles  for  communication  lines,  etc.  and  for  fire proofing timber.

Zinc Chloride (ZnCl2 2 H2O) is usually in the form of  white granular  deliquent  crystals or crystalline powder.  It  is  not easily   obtained   in  anhydrous  form  but   usually   contains approximately  5%  water.  It  is  soluble  in  water,   alcohol, glycerine,  and ether. Its specific gravity at 25oC is 2.91;  m.p 283oC and boiling point 732oC, It is sold in four grades.

99% minimum          (Refined grade)

94% minimum          (Battery grade)

92% minimum          (Technical grade)

78-84% minimum        (Flux grade)

Global Zinc Chemicals Market stood at nearly USD7.90 Billion in 2017 and is anticipated to grow at a steady rate, witnessing CAGR of 4.89% during the forecast period, reaching USD12.92 Billion through 2027. The growth in the Global Zinc Chemicals Market can be attributed to the versatile applications of zinc derivatives in several industries. Moreover, the ongoing M&A activities among industry behemoths such as Zinc Oxide L.L.C. and Zochem Inc. would further cater to the growth in Global Zinc Chemicals Market at a modest pace, during the forecast period.

Process:

Anhydrous zinc chloride can be made from the reaction of the metal   with chloride or hydrogen chloride. It is usually made commercially by the reaction of aqueous hydrochloric acid with scrap zinc materials or roasted ore, ie. crude zinc oxide.

The solution of zinc chloride is purified in various ways depending upon the impurities present.

For  example,  iron  and  manganese  precipitate  after   partial neutralization with zinc oxide or other alkali and oxidation with chlorine  or sodium hypochlorite, heavy metals are  removed  with zinc  powder,  the  solution  is  concentrated  by  boiling,  and hydrochloride  acid  is added to prevent the formation  of  basic chlorides,  zinc  chloride is usually sold as a 47.4  Wt%  (1.53) solution,  but  is  also  produced in solid  form  by   further evaporation  until, upon looking, an anhydrous salt  crystallizes the solid is sometimes sold in fused form.

Zinc  chloride can be prepared by several methods,  although zinc  chloride can be prepared by passing chloride gas  over  red hot zinc or zinc oxide, or by the action of hydrochloric acid  on zinc or spelter (98-99% Zinc) or Zinc oxide it is more economical to produce it from secondary zinc sources such as Zinc scrap from sheet  cutting,  zinc  anodes, old zinc roofings  and  zinc  die, casting  or  from zinc rich residues in  manufacturing  processes such as galvanizing. In India the most common raw materials  used in  the manufacture of zinc dross (92-94% zinc) Zinc ash  (60-65% Zinc) and  zinc skimmings (40-45% Zinc) which are  obtained  from galvanizing industry.

To produce 20 Ton/day zinc chloride, Land area required 4000 sq. mtr. Approx., Machinery Cost Rs. 1.40 Cr., Raw Materials Zinc Ash and others Cost 2 Cr./month, Rate of Return: 29%. Do call on +91 9811437895 to obtain a copy of the project report or email at eiri@eiriindia.org

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