Zinc Chloride (CAS 7646-85-7)

High-purity Zinc Chloride ($\text{ZnCl}_2$, Anhydrous/Technical Grade, $\ge$98.0% purity) engineered for high-performance applications across hot-dip galvanizing, polymetallic froth flotation, primary ZnCl2-carbon/zinc-air battery formulations, and Lewis acid organic synthesis.

Instant Technical Summary

• Active Content ($\text{ZnCl}_2$): $\ge 98.0\%$

• Physical Form: White, highly deliquescent crystalline powder / granules

• CAS Number: 7646-85-7 | EC Number: 231-592-0

• pH (10% aqueous solution): ~4.0 – 5.0

• Solubility: $432\text{ g}/100\text{ g } \text{H}_2\text{O}$ at 25°C; highly soluble in ethanol, glycerol, and acetone

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Technical Specifications & Certificate of Analysis (COA) Standards

Technical Parameter	Standard Specification	Testing Method / Protocol
Active Content ($\text{ZnCl}_2$)	$\ge 98.0\%$ min	Titrimetric (EDTA Complexometry)
Basic Zinc Compounds (as $\text{ZnO}$)	$\le 1.8\%$ max	Acid Neutralization Back-Titration
Iron ($\text{Fe}$)	$\le 0.005\%$ (50 ppm) max	Inductively Coupled Plasma (ICP-OES)
Heavy Metals (as $\text{Pb}$)	$\le 0.002\%$ (20 ppm) max	Atomic Absorption Spectroscopy (AAS)
Sulfate ($\text{SO}_4^{2-}$)	$\le 0.01\%$ max	Barium Sulfate Gravimetry / Turbidimetry
Water Insolubles	$\le 0.02\%$ max	Gravimetric Analysis
Density	$2.907\text{ g/cm}^3$ at 25°C	Pycnometry
Melting Point	290°C (Anhydrous)	Differential Scanning Calorimetry (DSC)

Industrial & Metallurgical Applications

1. Metallurgical Fluxing & Flotation Depression

• Hot-Dip Galvanizing & Soldering: Acts as a chemical surface cleanser by dissolving surface iron oxides ($\text{Fe}_2\text{O}_3 + 6\text{HCl} \rightarrow 2\text{FeCl}_3 + 3\text{H}_2\text{O}$) and preventing re-oxidation of steel prior to immersion in molten zinc baths. Typically formulated in combination with Ammonium Chloride ($\text{NH}_4\text{Cl}$) as a double salt ($\text{ZnCl}_2 \cdot 3\text{NH}_4\text{Cl}$).

• Froth Flotation Circuits: Serves as a selective sphalerite ($\text{ZnS}$) and pyrite depressant in complex polymetallic $\text{Pb-Zn-Cu}$ ore processing, often regulated in alkaline pH regimes alongside Sodium Carbonate ($\text{Na}_2\text{CO}_3$) or cyanide reagents.

2. Chemical Synthesis & Battery Electrolytes

• Lewis Acid Catalysis: Drives electrophilic substitution reactions, including Friedel-Crafts alkylation, Fischer indole synthesis, and dehydration of primary alcohols.

• Aqueous Batteries: Functions as the primary ionic electrolyte in heavy-duty Zinc-Carbon ($R6/P60$) and secondary zinc-air cell chemistries to optimize conductivity and retard zinc dendrite formation.

3. Dosing Protocols & Solution Preparation

• Flotation Circuit Dosing: $100\text{ to }500\text{ g/tonne}$ of dry ore feed, added as a freshly prepared $10-20\%$ aqueous solution directly to conditioning tanks.

• Galvanizing Flux Baths: Maintained at an aqueous ratio of $1:1\text{ to }1:4$ ($\text{ZnCl}_2 : \text{NH}_4\text{Cl}$) at operating temperatures between 60°C and 80°C with total salt concentrations between $300\text{ and }450\text{ g/L}$.

Packaging, Logistics & Storage

• Packaging Configurations:

  • 25 kg multi-wall paper bags with heavy-duty Polyethylene (PE) inner liner.

  • 50 kg fiber or steel drums with moisture-tight seals.

  • 1,000 kg FIBC Big Bags with integrated aluminum-foil/PE moisture barrier liners.

• Storage Protocols: Deliquescent solid. Store in a cool, dry, well-ventilated warehouse below 30°C. Keep containers tightly sealed. Isolate from strong bases, strong oxidizers, and cyanides (risk of toxic $\text{HCN}$ liberation).

• Transport Classification:

  • UN Number: UN 2331 (Zinc Chloride, Anhydrous) / UN 1840 (Zinc Chloride Solution)

  • Hazard Class: Class 8 (Corrosive Materials)

  • Packing Group: PG III

Safety, EHS & Regulatory Compliance

GHS Classification & Hazard Statements

• H302: Harmful if swallowed.

• H314: Causes severe skin burns and eye damage.

• H410: Very toxic to aquatic life with long-lasting effects.

Handling PPE & Industrial Hygiene

• Wear full NIOSH-approved dust/fume respiratory protection (N95/P100), neoprene or chemical-resistant nitrile gloves (min. 0.4 mm thickness), and chemical safety goggles with a full-face shield.

Certifications & Compliance

• ISO 9001:2015 Quality Management Certified Manufacturing

• REACH Registered (EC No. 231-592-0)

• RoHS/WEEE Compliant

• Lot-Specific Certificate of Analysis (COA) supplied with every shipment.