Caustic Soda/Sodium Hydroxide 99% (Pearl)

Caustic Soda/Sodium Hydroxide 99% (Pearl)

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. Other applications include water treatment, food, textiles, metal processing, mining, glass making, and others.

WHAT KEMCORE PROVIDES AS A PARTNER?

Reliable Supply

KEMCORE is always prepared to fulfill orders as they're placed and deliver the product customers need.

Commitment to Safety

KEMCORE has been safely and responsibly distributing Caustic Soda (Pearl form) for decades and continues to make advancements through improved packaging options, on-site unloading services, and comprehensive training for our customers.

Dedicated Support

Whether it’s assisting with Caustic Soda handling or regulatory needs like licensing, permitting, and compliance monitoring, support is available.

COUNTRIES OF ORIGIN

• China
• Russia

Synonyms: Caustic soda lye, White Caustic sodium hydroxide, Caustic Soda pearl, Sodium Hydroxide Perlen, Caustic soda, ionic exchange membrane solid, Sodium hydroxide pearl, Caustic soda, Sodium hydroxide, Pearl caustic, Caustic soda solid, Caustic Soda Pearls.

Molecular Formula: NaOH

CAS Number: 1310-73-2

Physical Properties

Appearance: White, orthogonal crystals

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

Odor: Odorless

Boiling point: 1,388 °C

Melting/freezing point: 318 °C

Specific gravity: 2.13 @. 20°C

Flashpoint: Non-flammable

pH: 12.7 (1% aqueous solution)

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 the formation of hydrogen sulfide 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 solubilizing the adsorbed gold cyanide complex and the caustic (sodium hydroxide) is added to maintain a high pH to minimize 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 the 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 Atmospheric Zadra Stripping, and the Micron Elution Procedure.

In these processes, gold that is adsorbed on the carbon is desorbed by the 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.