Zinc Carbonate has the chemical formula
2(ZnCO3) * 3(Zn(OH)2).
Zinc Carbonate is used to remove sulphides
caused by the intrution of hydrgen sulphide gas in water based muds. Zinc
Carbonate reacts to precipitate soluble sulphide as insoluble zinc sulphide.
The reaction is repid and will occur over broad pH range including both
alkaline and acid environments. Zinc Carbonate is non-corrosive to ferrous
metal and protects rig personnel from hydrogen sulphide poisoning.
2.8 kg/m3 (1 lb/bbl) of Zinc
Carbonate removes approximately 500 ppm of hydrogen sulphide from solution. An
initial treatment of 6 – 9 kg/m3 (2 – 3 lb/bbl) of Zinc Carbonate is
recommended when hydrogen sulphide gas is anticipated. The sulphide or Zinc
Carbonate content of the muds can be determined with the Hach test or the
Garrett Gas Train. Large intrusion of hydrogen sulphide may require additional
Zinc Carbonate treatments. Large additionalof Zinc Carbonate need to be made quickly, some increase in rheological
properties may occur, but addition of water and/or a deflocculant such as
safethin should restore satisfactory flow properties. Zinc Carbonate has a density
similar to that of barite and will require a viscosifier of it is used in water
or brine system.
TYPICAL PHYSICAL PROPERTIES
pearl of flakes
pH in H2Oneutral
Bulk density432 kg/m3 (27 lb/ft3)
SAFE HANDLING RECOMMENDATIONS
Utilize normal precaution for employee
protection when handling chemical products.
Use of appropriate respirator gloves,
goggles and apron is recommended for employee comfort and protection.
Zinc Carbonate does not have a restricted
classification for transportation by the international or domestic regulatory
Zinc Carbonate is packaged in 25 or 50 kg