The main applications of lime in industrial wastewater treatment include pH correction, heavy metal management, neutralizing acidic waters, softening water chemistry, precipitation of dissolved materials and water clarification when used with flocculants.
Where tailings contain fine particles or clay, lime products can be used to improve dewatering and recoverable process water. This treatment can also result in improved handling, material strength and a stackable tailings product that can be used in landform reclamation.
Stone Dust and Rock Dust products are made to meet relevant industry specifications and are available in certain packaging types from nominated Graymont sites across the Graymont network. For more information please review the related product pages in the Products section of our website.
With an increase in pH, soluble calcium will become more mobile and modify fine particles in a way that improves settlement. This modification can also reduce the need for additional flocculants while improving the density and strength of the flocs.
Adding lime and controlling pH will lock up soluble metals and convert those metals to a more chemically stable form that is less likely to leach. In addition, when added to soils and sludges, lime can be a very effective way to solidify and dewater materials and manage pathogens of various types. In recent times, lime is being trialed as an aid to improve soil mechanical properties for oil and diesel contaminated soils.
Where required, our products are manufactured to meet industry or local specifications. Surface or top courses are also available depending on the Graymont site and location of the works.
Fill products we can supply are often a mix of limestone with variable percentages of soil and clay. Grade and availability will vary depending on the quarry works being carried out at the time. Please contact our sales team enquire about the composition and availability of fill materials.
Various products are available including Rip Rap/Shot Rock and Armour Rock for the protection of shorelines, steep slopes, stop banks and bridge foundations. Suitable size grades for gabion baskets or wire mattresses are available at some sites by arrangement. Please contact our sales team to enquire about availability in your region.
