Celestite Powder

Celestite Powder from Pakistan

Celestite powder is produced by finely grinding natural celestite ore (SrSO₄) into a white to off-white powder with controlled particle size. The milling process increases the mineral’s surface area and reactivity, making it directly usable in chemical processing, ceramic formulations, and oilfield drilling applications without further size reduction. Pakistan’s celestite deposits in Balochistan and Sindh yield high-grade ore that is milled into a range of standard powder grades at dedicated grinding plants near the mine sites.

Specifications

• Mineral: Celestite (SrSO₄)

• SrSO₄ Content: 80-96% (grade-dependent)

• SrO: 45-53%

• BaSO₄: 0.5-5%

• CaSO₄: 0.5-4%

• SiO₂: 0.5-3%

• Fe₂O₃: < 0.3%

• Moisture: < 0.5%

• Specific Gravity: 3.9-4.0

• pH: 6.5-7.5

• Colour: White to off-white

• Whiteness: 80-92% (grade-dependent)

Available Mesh Sizes

• 100 mesh (150 microns)

• 200 mesh (75 microns)

• 325 mesh (45 microns)

• 400 mesh (37 microns)

• 600 mesh (25 microns)

• Custom grinds available

Industrial Uses

• Strontium carbonate production: Fine celestite powder dissolves faster than lumps in the black ash process and direct carbonation routes, improving conversion rates and reducing processing time for SrCO₃ manufacturers

• Drilling fluids (weighting agent): Ground celestite is used as a high-density weighting agent in oil and gas drilling muds, serving as an alternative to barite (BaSO₄). Its specific gravity of 3.9-4.0 provides effective borehole pressure control in drilling operations

• Ceramic and glass: Celestite powder is used as a source of SrO in ceramic glazes, electronic ceramics (strontium titanate, strontium barium titanate), and specialty glass formulations. It improves glaze surface tension, dielectric properties, and glass clarity

• Pyrotechnics and fireworks: Fine celestite powder is blended into pyrotechnic compositions to produce brilliant red-coloured flames in fireworks, signal flares, and military tracer rounds

• Ferrite magnet production: Ground celestite is used as a strontium source in the production of strontium ferrite permanent magnets for motors, speakers, and magnetic separators

• Pigments and coatings: Strontium chromate pigment (corrosion-inhibiting primer) and strontium aluminate pigment (glow-in-the-dark coatings) are produced from celestite-derived strontium compounds

• Zinc electrolysis: Celestite-derived strontium carbonate is used in zinc electrolyte purification to remove lead impurities and improve zinc cathode quality

• Sugar refining: Strontium hydroxide produced from celestite is used in the beet sugar refining process

• Filler and extender: Ground celestite is used as a high-density filler in specialty paints, adhesives, and polymer compounds

Quality Assurance

Each lot includes a Certificate of Analysis reporting SrSO₄, SrO, BaSO₄, CaSO₄, SiO₂, Fe₂O₃, moisture, whiteness, pH, and particle size distribution. Pre-shipment samples are provided for buyer approval. Third-party inspection (SGS, Intertek, or equivalent) can be arranged on request.