ZINC CARBONATE (ZnCO3) is used as a hydrogen sulfide (H2S) scavenger in both water- and oilbased drilling fluids.
3.0 – 6.0 kg/m³ (normally)
1 kg/m³ (typically) will treat out 256 mg/L H2S at pH 9-11
At pH higher than 11.0, ZINC CARBONATE will dissociate rapidly releasing zinc ions, which will result in flocculation of fresh water-based drilling fluids. This can be avoided by parallel treatment with Lime; 0.25 kg Lime for every kg of ZINC CARBONATE.
Appearance: White powder; odourless
Specific Gravity: 4.398
Solubility: Insoluble (water); moderately soluble in acids