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Caustic soda/Sodium Hydroxide 99% (Pearl)

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Caustic soda/Sodium Hydroxide 99% (Pearl)

  • FOB Reference Price
    $760.00 /ton
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    489 Tons Sold. ( >180 days)
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    Saturday 11th January 2020 ?

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Synonyms : Caustic soda lye, caustic LyeSodium hydrate soda lye,White Causticsodium hydroxide, solid solid,Caustic Soda flakes, Sodium hydroxide perlen,Caustic soda,ionic exchange membrane solid,Sodium hydroxide,flake,Caustic soda, liquid,Sodium hydroxide,liquid,Flake caustic,CAUSTIC SODA SOLID,Caustic Soda Pearls

Recommended use: Elution stripping of gold adsorbed onto activated carbon

Other uses :Caustic soda (sodium hydroxide) is a versatile alkali. Caustic soda is an essential ingredient in an array of industrial applications. Its main uses are in the manufacture of pulp and paper, alumina, soap and detergents, petroleum products and chemical production.

 In gold processing, strongly alkaline conditions are needed in the stripping of loaded carbon with cyanide solution. This is because caustic soda provides protective alkalinity that stabilizes the cyanide complex and prevents formation of hydrogen sulphide during its use. This stage involves treating the carbon with a caustic-cyanide solution at high temperature (115°C) and pressure (230 kPa). The sodium cyanide is required for solubilising the adsorbed gold cyanide complex and the caustic (sodium hydroxide) is added to maintain a high pH to minimise the evolution of HCN gas.

Elution stripping of gold adsorbed onto activated carbon- Elution involves feeding the carbon into a special pressure vessel called a column. The carbon is pumped to the column and the water is drained. A mixture of caustic soda and cyanide is pumped through the column to contact the carbon. This mixture extracts the gold from the carbon to make a concentrated solution of gold. These parameters are the temperature, the flow rate of the elution, the pH (or the free caustic soda strength).


The advantage of using caustic soda lies in its purity which ensures that not much ‘junk’ material is introduced into the system when correcting the pH. Consistency in specification of the product also ensures process predictability .


Method of Application

Several methods are used to strip loaded activated carbon of gold. These include Alcohol Stripping, Pressurized or Artmospheric Zadra Stripping and the Micron Elution Procedure.

In these processes, gold that is adsorbed on the carbon is desorbed by reversal of the adsorption reaction. The gold, now back in solution is then recovered on wire-wool in electrowinning cells. The solution used to strip the carbon normally contains 1% sodium hydroxide and 0.1% sodium cyanide solution. Variable parameters used in the various stripping technologies include stripping temperatures and pressures as well as the solution concentrations being used.


Molecular Formula: :NaOH

Cas Number: 1310-73-2

Physical Properties

Appearance: White, othogonal crystals

Form: Colorless to white ... solid (flakes, beads, granular form).

Odor: Odorless

Boiling point: 1,388 °C

Melting/freezing point: 318 °C

Specific gravity: 2.13 @. 20°C

Flash point: Non-flammable

pH: 12.7 (1% aqueous solution)


View FileCaustic soda/Sodium Hydroxide 99% SDS    Size: (1.27 MB)

Caustic soda/Sodium Hydroxide 99% flakes SDS

View FileCaustic soda/Sodium Hydroxide 99% pearls COA    Size: (1.26 MB)




  • Transport-UN UN 1823
  • Hazard Class No. : 8 Corrosive
  • Packing Group: II
  • HS Code: 28341000


Store in a cool, dry, well ventilated place and out of direct sunlight. Store away from foodstuffs. Store away from incompatible materials . Keep containers closed when not in use - check regularly for spills.



Packing type


 25kg PE/PP bags

24/25 tons/FCL

  25kg PE/PP bags (Pallets)




4. Environmental impact


-        Although caustic is only slightly toxic to aquatic organisms, a large discharge can change the pH of the aquatic system which may be toxic to aquatic organisms.




  • With thousands of suppliers competing for our business, Kemcore has proven to be the most reliable and consistent import/export company in China, offering quality chemicals at competitive prices. We strive to continue working with them.

    Macheng Macheng

    Senior Buyer

    KS Energy (Pty) Ltd

  • Kemcore’s greatest advantage is understanding our culture, values, and expectations for business transactions, quality, and delivery from the Asian market feeding into Africa. Our business started with trial orders of 20 tons to the current 350 tons per month.

    Mike Peto

    Managing Director

    Sesani EPCM

  • Our import volume of chemicals and other mining accessories stands at $5.65mil/yr. We have significantly increased our market share due to the competitiveness & consistency in quality.

    Menfred Mukumba (MCIPS)

    Supply Chain Manager

    Intrachem Pvt Ltd

  • Kemcore continues to be  instrumental in procuring a complete suite of reagents for  our gold/copper flotation plant . I do not hesitate to recommend Kemcore services for Xanthate, DTP's plant reagent supply, especially when procuring out of China.

    Brienie Dzumbunu

    Metallurgical Superintendent

    Pan African Mining

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