Lime - Markets We Serve
Boral Lime is used to improve water quality in water treatment plants serving four main purposes namely water softening, pH adjustment / coagulation, effecting pathogen growth and the removal of impurities.
In water softening, Boral Hydrated Lime products act to remove carbonate hardness from the water, caused by bicarbonates and carbonates of calcium and magnesium.
Boral Hydrated Lime products are widely used to adjust the pH of water to prepare it for further treatment. Boral lime is used in conjunction with alum or iron salts for coagulating suspended solids incident to the removal of turbidity from raw water, serving to maintain satisfactory pH levels for most conditions.
Boral Lime controls the environment required for the growth of bacteria and certain viruses by raising the pH of water to between 10.5 to 11.0 and remaining in contact with the water for 24 to 72 hours.
Waste water treatment in steel plants use Boral quicklime to neutralize acid-based waste water in which the iron sales are precipitated. Boral lime is also a neutraliser and precipitant of chrome, copper and heavy metals in processes for treating discharges.
Boral's commitment to large-scale production is unparalleled. Australia's mining industry is one of it's largest and most important.
Our comprehensive understanding of the requirements of the mining industry, coupled with our ability to manufacture high-quality - fit-for-purpose material ensure Boral are most than just a supplier to our mining industry customers.
Boral lime is used by gold and alumina mining and refining companies in controlling the pH of slurries which strip precious minerals from mined earth. Control of pH prevents the venting of noxious gasses into the atmosphere.
Sewerage & Waste Treatment
Boral manufacture lime products to be used in the treatment of sewerage, waste-water and industrial wastes.
Boral quicklime is employed in wastewater treatment by precipitating phosphorous as complex calcium phosphates along with other suspended and dissolved solids. The stripping of nitrogen is also facilitated due to high the pH maintained by the lime.
Boral lime is also used to counteract low pH caused by coagulation by means of alum and ferric chloride dosing. Boral lime and ferric chloride may also be used as a filter aid in the conditioning of sludge and for final clarification of the effluent.
In industrial applications lime is used to neutralise various sulphuric acid based wastes and as a neutraliser of chrome, copper & heavy metals.
Boral lime is used in treating a variety of other wastes including animal wastes, industrial sludges, petroleum wastes and hazardous wastes.
The steel industry use Boral quicklime in the production process as a flux in purifying steel in both basic oxygen furnaces and electric arc furnaces. Boral quicklime (generally coarse) is added to the mixture in the steel making furnace where it reacts with impurities particularly silica, phosphorus and sulphur; later forming liquid slag which is separated from the steel and removed from the furnace.
In sinter manufacture, Boral Premium Fine Quicklime is premixed with sinter charge before processing onto sinter strands to produce self-fluxing iron ore pellets, which are then used to charge the blast furnace.
Blue Circle hydrated lime has a number of applications in the production of steel products, being used most commonly in wire drawing where Blue Circle coarse quicklime is mixed into a slurry, slaked and used to coat steel rods and wire. The slurry acts as a lubricant as the steel rods or wires are drawn through dies. Boral lime can also be used in the steel industry to perform secondary refinements on the steel, including adjusting steel temperature and chemistry.
Boral manufactures quicklime and hydrated lime for use in stabilisation and soil modification.
Boral lime benefits stabilisers in two ways; by providing a chemical reaction serving to agglomerate finer soil particles to improve the earth's workability and by reacting with clay based soils, enhancing the strength and water resistance of the soil. By adding measured amounts of lime to reactive soil a pozzolanic reaction takes place. Immediate and long-term pozzolanic reaction leads to improvements in sub-grade strength, stability, permeability and load bearing capacity.
Boral lime is a primary component used in the hot mixing of asphalt to eliminate both moisture sensitivity and the loss of adhesion between the surface and asphalt cement. Boral lime works to reduce age hardening and brittleness of asphalt binder and hot mix asphalt.
As a mineral filler Boral lime improves resistance to high temperature rutting and adding fracture toughness at low temperatures.