Concrete sludge recycling system

Ecotancal

Environmentally friendly precipitated calcium carbonate made from CO₂

The raw materials of Ecotancal are CO₂ contained in boiler exhaust gas released into the atmosphere and highly alkaline wastewater, making it an environmentally friendly product.
Ecotancal is manufactured mainly through chemical reactions. It has high purity and can be used for a wide range of industrial applications.

Features

• The raw materials are CO₂, which is a greenhouse gas, and highly alkaline wastewater.
  Ecotancal is produced by reacting highly alkaline wastewater generated at precast concrete product factories with CO₂ contained in boiler exhaust gas.
  Approximately 440 g (more precisely, 427–436 g) of CO₂ is fixed for every 1 kg of Ecotancal.
• High-purity quality
  Ecotancal is manufactured through chemical reactions. Since no impurities are introduced during the manufacturing process, high-purity calcium carbonate can be provided.
  Its purity is 97 wt% or higher. Ecotancal also provides a high degree of whiteness.

Example applications

• Flue gas desulfurization material
  Can remove sulfur oxides from exhaust gas.
• Alternative aggregate for concrete raw materials
  Improves the flowability of concrete.
• Paper, paint, and coatings
  Contributes to improving whiteness.
• Rubber products
  Can be used to modify rubber and as a filler.
• Plastic products
  Contributes to improving the strength and material properties of plastics.
• Line marking material for sports grounds
  A safer product compared with conventional slaked lime.

Technical development achievements

• Joint research with the Graduate School of Frontier Sciences, The University of Tokyo NEDO FY2008
• “Practical research and development program for university-based business creation” Ministry of Land, Infrastructure, Transport and Tourism FY2010–FY2011
• “Subsidy program for leading technology development in housing and building” Ministry of Economy, Trade and Industry FY2016
• Infrastructure development study for the acquisition of bilateral credits “Feasibility study for a JCM project on large-scale greenhouse gas reduction and dissemination through CO₂ capture and fixation in Thailand’s cement industry”
• Joint research with Tohoku University, The University of Tokyo, and Seikei University "Pilot-Scale Operation of a Concrete Sludge Recycling Plant and Simultaneous Production of Calcium Carbonate" Chemical Engineering Communications, Vol. 204, 2017

Related papers and books

• Pilot-Scale Operation of a Concrete Sludge Recycling Plant and Simultaneous Production of Calcium Carbonate
• Bench-Scale Operation of a Concrete Sludge Recycling Plant
• Aqueous Mineral Carbonation Process via Concrete Sludge
• Phosphorus recovery in a continuous flow system using concrete sludge-derived granular phosphorus removal material (PAdeCS)
• Phosphorus Adsorbent Derived from Concrete Sludge (PAdeCS) and its Phosphorus Recovery Performance
• Phosphorus recovery and recycling

Catalog

• Ecotancal Brochure [159KB]