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  • Water Treatment :: Nordkalk
    and with pH control Lime water stands for clear liquid which does not consist of lime in a solid form When using lime water the reaction in the actual deacidification process is faster and more even as the dissolving process has taken place already in the making of the lime water Lime water is made from a suspension of slaked lime Big water utilities can use quick lime as the original material and it will be slaked in situ before dosing Waste Water The main goal of waste water treatment is to minimise the burden on the receiving watercourses by removing all organic oxygen consuming compounds and nutrients At municipal waste water treatment plants waters are mostly treated with biological chemical methods in which lime products can be used for controlling the pH and alkalinity precipitating nutrients handling sludge and removing odours The pH and alkalinity of water can be raised with lime products Lime products differ from each other chemically and affect the process and the end result in different ways Calcium carbonate is slightly caustic and it dissolves slowly The product works best when ground fine and when the pH of the waste water is less than 6 5 The product dosage is controlled by the flow rate Calcium oxide and calcium hydroxide are strongly caustic With these products the pH level of waste water can easily be regulated to the desirable level The chemical reactions are fast therefore the pH signal can be used for controlling the dosage Precipitation of Phosphorus The different phosphorus compounds can be precipitated from waste water efficiently with calcium ions The high pH level required for precipitation can be reached by using calcium oxide or calcium hydroxide Process Waters Nordkalk s QL and SL products i e quicklime and slaked lime are mainly used for the neutralisation of industrial waste waters In some cases the more slowly reacting limestone powder is needed Industrial waste waters are treated either at a company s own waste water treatment plant or they are prepared before being led into the municipal sewer system Lime products are used for neutralising acidic waters the precipitation of dissolved impurities and removing colour The biggest industrial waste water treatment plants with different biological phases function just like the municipal plants where lime products are used for controlling pH levels and alkalinity Precipitation of Metals Lime products are used e g at steel mills and treatment plants for the neutralisation of different acid baths and the precipitation of metals When the precipitation is done right at the start of the process harmful heavy metals will not end up in the water ways or in the municipal water treatment plant s sludge to impede the recycling of the sludge Lime products are good for precipitating different metal ions such as aluminium AI copper Cu chrome Cr iron Fe Zinc Zn lead Pb nickel Ni and cadmium Cd Lime products can also be used for removing harmful anions such as sulphates fluoride and

    Original URL path: http://www.nordkalk.de/default.asp?viewID=2166 (2016-04-28)
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  • Energy :: Nordkalk
    such as different sulphur chlorine and fluorine compounds can be removed from the flue gas before the chimney This takes place by neutralising the compounds with limestone based products The choice of a suitable lime product is based on the cleaning method used and its cost effectiveness Depending on the cleaning method some of the byproduct of the cleaning can be recycled in the construction industry e g in the making of gypsum board Flue gas cleaning methods are usually divided into the wet half dry and dry methods Pulp and Paper Pulp Lime GCC calcite PCC lime Metals and Mining Mining Industry Metal Industry Steel Industry Construction Stabilisation and Road Construction Concrete Building Materials Other Industries Plastic and Rubber Wollastonite Nordkalk C Series Ceramics and Glass Adhesives and Binders Paint and Coatings Nordkalk C Series Nordkalk E Series Nordkalk W Series Sugar Chemical Industry Agriculture Soil Improvement Feed and Fertilizers Environment Water Treatment Energy FGD Vessels Liming of Waterways Fostop Dry Scrubber About Limestone based Products Production Processes CE Marking Safety Data Sheets Timo Kanerva Sales Manager Environment and Agriculture Finland Tel 358 0 20 753 7395 Tel 358 0 40 569 4801 Fax 358 0 20 753 7830

    Original URL path: http://www.nordkalk.de/default.asp?viewID=2167 (2016-04-28)
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  • FGD Vessels :: Nordkalk
    Scrubber About Limestone based Products Production Processes CE Marking Safety Data Sheets Marine SOx scrubbers Marine SO x scrubbers have been developed to abate the sulphur emissions from shipping Nordkalk s desulphurisation concept is based on a dry scrubber where granules made from Nordkalk slaked lime calcium hydroxide absorb sulphur from the flue gas of the ship The benefit of the dry scrubber is the absence of emissions to both air and sea as the process does not generate any scrubbing waters to be discharged into the sea Furthermore the structure of the dry scrubber is simple in comparison to other scrubbers Nordkalk offers turnkey absorbent deliveries for dry scrubbers and also recovers the used absorbent simultaneously with the refill The aim is to recycle 100 of the used absorbent for other applications When the EU Sulphur Directive for maritime traffic enters into force on 1 January 2015 any ship operating on the Baltic Sea North Sea or the English Channel must comply with the maximum allowable sulphur concentration of 0 1 per cent in airborne emissions up until 31 Dec 2014 the maximum sulphur concentration is 1 Pulp and Paper Pulp Lime GCC calcite PCC lime Metals and Mining

    Original URL path: http://www.nordkalk.de/default.asp?viewID=2474 (2016-04-28)
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  • Liming of Waterways :: Nordkalk
    risk of overdose In a typical case of lake liming about 0 5 1 5 tonnes of limestone powder hectare are needed In large watercourses the most common spreading methods are liming boats choppers and different dispensing devices The liming of lakes and ponds can also be performed on top a thick layer of ice Liming boats are used in places where the lime powder is spread directly into the lakes Small lakes and wetlands are often outside road systems so the only possible method is to use a chopper Different dispensing devices are a natural choice when liming running waters In Finland lake liming is done when possible in winter directly on the ice The spreading is done with machinery designed for field liming Liming on ice is almost as effective as boat liming but warm winters and heavy machinery limit the use of the method The brook and river courses burdened by the acid sulphate soil on the west coast of Finland and the delta areas often require heavier liming methods to achieve good water quality Efficient liming stations work non stop to neutralise river courses These units technically resemble the liming dispensers of water utilities and waste water treatment plants Peat Production Neutralizing Acid Natural Waters As a result of the draining of forests and peatlands and peat production acidic surface runoff waters can develop at production sites Depending on the situation of the receiving watercourse the amount of water and the acidic burden these waters must sometimes be neutralised before conducting them into the watercourse In addition to the acidic burden the runoff water may contain harmful amounts of metals such as aluminium iron and manganese Powder like calcium carbonite products and calcium hydroxide best suit the neutralisation of acidic natural water Pulp and Paper Pulp

    Original URL path: http://www.nordkalk.de/default.asp?viewID=2168 (2016-04-28)
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  • Fostop :: Nordkalk
    exclusion zones and reducing fertilisation These methods do not always give the desired results therefore an option is resorting to the local treatment of runoff waters Implementation The Fostop lime filter can be realised depending on the application either as a filter drain sand filter or filter well The Fostop lime filter can be built as part of a wetland and this way strengthen the functioning of the wetland The method has been developed by Nordkalk the leading expert on lime with unique experience and knowhow about lime and its uses Field tests have shown that the use of lime filters can considerably reduce the leaching of phosphorus into watercourses Profits to the Farmer Reduces the leaching of phosphorus Phosphorus can be recycled back to the field Lime from the filter can be utilised in agriculture Lime filter will intensify the purification of the wetlands Environmental Act to Benefit us all The environment and society benefit at least as much as the farmer The phosphorous leaching from the fields is a significant source behind the nutrient burden on watercourses Lime filter applications give significant benefits Less phosphorous into watercourses Cleaner lakes and seas Fewer algal blooms Phosphorous can be recycled Recreational value of watercourses increases Other Applications in the Fostop Product Family FOSTOP Sludge stabilisation hygienisation of different types of organic sludge with quicklime The sludge can be reused in farming FOSTOP Structure Pulp and Paper Pulp Lime GCC calcite PCC lime Metals and Mining Mining Industry Metal Industry Steel Industry Construction Stabilisation and Road Construction Concrete Building Materials Other Industries Plastic and Rubber Wollastonite Nordkalk C Series Ceramics and Glass Adhesives and Binders Paint and Coatings Nordkalk C Series Nordkalk E Series Nordkalk W Series Sugar Chemical Industry Agriculture Soil Improvement Feed and Fertilizers Environment Water Treatment Energy FGD

    Original URL path: http://www.nordkalk.de/default.asp?viewID=2173 (2016-04-28)
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  • About Limestone-based Products :: Nordkalk
    Sheets Nordkalk Products Limestone based products usually referred to simply as lime are needed in many different industries in environmental care and in agriculture Nordkalk s main products are limestone crushed and ground limestone concentrated calcite quicklime and slaked lime The products also include dolomite and a rare mineral called wollastonite which is found together with limestone Limestone is a versatile and often irreplaceable raw material in many applications It plays an important role in the manufacture of products that maintain our well being Every day we all use products that could not have been made without limestone based products Limestone on Your Breakfast Table Juice and coffee are made of good quality drinking water in the production of which limestone based products are used The cutlery on your breakfast table is made of steel and lime is needed in many stages of the steel manufacturing process In the production of magazine paper and milk cartons limestone is used in a refined form as filler and for coating purposes Almost half of high quality coated magazine paper can consist of minerals In sugar production process lime is used to absorb impurities Almost one third of glass consists of limestone The cows that produce the milk for your breakfast need calcium e g for bone development and their nervous system The calcium comes from feed lime that is made of the purest limestone Wollastonite adds to the impact resistance of plastic Cereals and vegetables prosper in a well limed field because limestone reduces the acidity of the soil and releases the nutrients of the field for the plants to use The egg would have no shell if there was no lime in the hen s feed Limestone Purifying Natural Product Originally limestone is a sedimentary carbonate rock consisting mainly of calcite

    Original URL path: http://www.nordkalk.de/default.asp?viewID=2175 (2016-04-28)
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  • Production Processes :: Nordkalk
    Processes CE Marking Safety Data Sheets Production Process of Limestone based Products Limestone CaCO 3 usually has to be extracted by means of blasting but the softest types can be excavated by machine The extracted stone is transported for rough crushing after which it is processed further for example by crushing sifting grinding refining or burning The stone goes through one or more crushing stages and different siftings The powders are made by grinding the stone in different mills In Lappeenranta Finland Nordkalk uses a flotation process The limestone is first ground into a wet slurry and the concentrated calcite is separated from the slurry by flotation The same method is used to separate wollastonite CaSiO 3 Quicklime Nordkalk s QL products are quicklime or calcium oxide CaO Quicklime is made by heating crushed and sorted limestone in either a rotary or shaft kiln The limestone CaCO 3 breaks down into calcium oxide i e quicklime CaO and carbon dioxide CO 2 This reaction termed calcination requires temperatures of approximately 1 100 C In a rotary kiln the heating process lasts about six hours in a shaft kiln calcination takes about 24 36 hours Quicklime is lumpy grainy or floury

    Original URL path: http://www.nordkalk.de/default.asp?viewID=2176 (2016-04-28)
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  • CE Marking :: Nordkalk
    calcite PCC lime Metals and Mining Mining Industry Metal Industry Steel Industry Construction Stabilisation and Road Construction Concrete Building Materials Other Industries Plastic and Rubber Wollastonite Nordkalk C Series Ceramics and Glass Adhesives and Binders Paint and Coatings Nordkalk C Series Nordkalk E Series Nordkalk W Series Sugar Chemical Industry Agriculture Soil Improvement Feed and Fertilizers Environment Water Treatment Energy FGD Vessels Liming of Waterways Fostop Dry Scrubber About Limestone

    Original URL path: http://www.nordkalk.de/default.asp?viewID=2180 (2016-04-28)
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