Ceramic slurry with incorporation of eggshell waste

  • UACOOPERA from uacoopera
  • From Portugal
  • Responsive
  • Patents for licensing

Summary of the technology

Process for preparation and incorporation of eggshell waste in the formulation of a ceramic slurry for porous pavement. With this invention aims to promote the use of a residue which has become an environmental issue, valorizing it by industrial application. The main ad-vantage of this the chance to enlarge the possibility of using a calcium residue substituting calcite, the traditional raw material, more expensive, without affecting final ceramic properties.



Egg transformation industry generate a big amount of eggshell waste, which cause significant environmental problems. In USA, Canada and United Kingdom 626 thousand tons of this residue are generated every year. Portugal produces 2600 tons/year, with transport and treatment associated costs of 122€/ton. On the other hand, ceramics industry is based on limited resources, which exploitation is associated with several environmental problems, such as residue generation and many of them are toxic.

The present technology allows the using of eggshell waste, which is composed by 95% of calcium carbonate, adding its value and avoiding its deposition in landfills, while granting ceramics industry the possibility to enlarge its capacity to use industrial residues without affecting final product properties comparing to calcite, the traditional raw material.


For egg transformation industry:


For ceramics industry:

COSTS REDUCTION: cheaper raw material.

SIMILAR FINAL CERAMIC PROPERTIES: final product with porosity, water absorption and linear retraction fulfilling industrial requisites.

For both industries:

REDUCTION OF ENVIRONMENTAL IMPACT accordingly to EU environmental policy.


This method can be used in the production of:


Additionally, it allows the valorization of a residue of the industry of:


This technology also has the potential to be applied in other areas, such as printing and writing paper.


TRL 4: The invention is in laboratorial prototype phase.

In a short period of time is possible to develop an industrial prototype to test processing conditions, namely conformation and sintering.





Porous pavement


Researchers of GEOBIOTEC – Geosciences, Geoengineering and Geotechnologies of the University of Aveiro and of the Higher School of Technology (ESTT) of the Polytechnic Institute of Tomar (IPT).


Licensing agreement.

Joint further development.

Adaptation to specific needs.

Testing of new applications.


The University of Aveiro seeks partners in ceramics industry, as well as in food industry, namely in egg production and transformation.

Technology #CI12017

Intellectual property status

  • Granted Patent
  • Patent application number :106957

Attached documents

Related Keywords

  • Construction Technology
  • Materials, components and systems for construction
  • Materials Technology
  • Ceramic Materials and Powders
  • Biobased Materials related to Construction Technology
  • Agrofood Industry
  • Technologies for the food industry
  • Protecting Man and Environment
  • Waste Management
  • Ceramics

About uacoopera

The University of Aveiro is a young and innovative university, which fosters entrepreneurship and technology and knowledge transfer, with expertise in a wide range of knowledge areas namely IT, Life Sciences (Biology, Chemistry, Biochemistry, Health, Environmental Sciences), Nanotechnology and Materials Science, Mechanics, Physics, Mathematics, Building, Design and Management. uacoopera is the Technology Transfer Office of University of Aveiro. This office engages in value adding activities such as start-up and spin-off creation, support to university-industry cooperation (sponsored research and consultancy services), IP protection and prosecution, licensing, marketing, among others. It covers four main interrelated functional areas – Intellectual Property Management, Licensing, Entrepreneurship, and Industry Liaison.

UACOOPERA University of Aveiro

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