in a responsible manner
Nordkalk has mines and production at 27 locations. Limestone is extracted and processed into crushed and ground limestone, calcium oxide (quicklime) and calcium hydroxide (slaked lime), as well as special products. See the production process here.
The operations can cause dust, noise and vibration. Nordkalk minimises these e.g. by using best available technologies (BAT) in investments and repairs.
Dust emissions can be controlled effectively. The air emitted by the grinding plants and lime kilns is purified using filters, which are also used at loading areas. Enclosed conveyor solutions prevent dust dispersion. Production areas and roads are asphalted in order to make cleaning as efficient as possible. Roads and stored stone material are watered during dry periods.
Sound insulation is improved by constructing noise barriers, planting trees and using various noise-damping materials at crushing plants, conveyor belts and loading places. In locations near residential areas, there are restrictions on night-time operations to avoid disturbances to the local residents.
Residential areas are taken into account when planning and carrying out blasting.
Vibration caused by blasting is measured; at Tytyri in Lohja, Finland, e.g. continuous measuring is carried out at three locations near the mine and at several temporary measuring points. On the basis of the results, necessary changes are made to blasting methods in order to reduce the amount of vibration.
Nordkalk has ensured the readiness of its production facilities for the demands of the EU’s Industrial Emissions Directive (IED), set to enter into force in 2017, by making significant investments in Best Available Techniques (BAT).
Noise barrier at Miedzianka
Noise barriers or acoustic baffles are the best way to "fight" noise, which is emitted by transport, trucks, trains and loaders. In 2015, the Miedzianka Plant in Poland finished building 700 metres of wall baffles along its traffic routes.
The seven metres high walls are made of sound-absorbing material. They are located on the side of the plant closest to the private houses.
The measurements that were carried out after the installing of acoustic baffles fulfilled the requirements of the contract concerning the reduction of noise emissions.
In 2016, additional actions were taken in order to further reduce noise emissions at night. As a continuation to the sound-absorbing barriers built a year earlier, two new environmental investments were finished. Special octagonal noise reducers were installed on the upper edge of the barriers. These octagonal noise reducers allow to lower the sound level by absorbing diffracted sound waves into the sound-absorbing mineral wool plate. Another improvement was replacing an old steel element gate with acoustic panels. The noise measurements carried out after finalising the construction showed significant reduction of the noise level.
Nordkalk is the leading limestone company on its home markets. We deliver essential raw materials to numerous industries, and our solutions contribute to clean air and water as well as productivity of agricultural land.