M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of NAS of Ukraine

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Development of geopolymer binders for conditioning of environmentally hazardous waste and materials

ABSTRACT

Research report: 92 p., 22 fig., 21 tables, 73 ref.

The object of study is application of geopolymeric binders for cementation of environmentally hazardous waste and materials.

The aim of the work is to develop waste conditioning methods basing on the study of the phase composition and properties of the geopolymeric binder components used in conditioning. Fly ash from Darnytska, Trypilska and Ladyzynska thermal power plants (TPP), Mariupol metallurgical plant's slay and metakaolin from the Hlukhovetske kaolin deposit (Ukraine) will be studied. Phases that do not form geopolymers are detected. This will allow to establish the ways of reducing the influence of these phases on the properties of the composites and develop geopolymeric binders that will improve the quality of the properties of the composites and develop geopolymeric binders that will improve the quality of the composites and thereby contribute to a wider involvement of geopolymers in the hazardous waste management.

The work presents the results of the study of the physical and chemical properties of binding materials (granulated blast furnace slag and ground brick-production waste), characteristic feautures of hazardous waste (TPP fly ash, liquid radioactive waste, contamined liquid hydrocarbons and spent sorbents), preparation of waste for conditioning, and the conditioning process.

It was found that:

- all above-mentioned waste can be conditioned and introduced into mineral matrices for long-term storage and disposal;

- the waste must be pre-treated before conditioning: fly ash should be sieved using a 120 µm sieve, liquid radiactive waste heated, oils pre-adsorbed on special adsorbents, spent sorbents are granulated on zeolite crystals should be heated to 800°C-900°C;

- granulated blast furnace slag with a high content of glassy phase and a significant amount of a hydraulically hardening component is the most universal binder;

- brick-production waste can be used selectively and requires additional study. Geological survey for more usable spondylic clays should be carried out. Variegated clays from the outcrops of some deposits should also be included into the study;

- the compressive strength limit of most of the synthesized samples exceeded 4,9 MPa. The compressive strength of the spent sorbent samples was the highest - 37,6 MPa. This allows to increase the amount of sorbents in the composites.

Prognostic assumptions regarding the further research - the geopolymeric binders used for hazardous waste conditioning have superior properties compared to Portland cement. This is confirmed by the data obtained during experimental studies. Further research will reveal the most promissing components and methods of their activation for reliable immobilization of hazardous waste.

Authors:

Rozko Alla Mykolayivna

Fedorenko Yurii Hryhorovych

Other authors:

Vozniak D.K.

Kulchetska H.O.

Belskyi V.M.

Butnik T.V.

Matveieva T.P.

Kushnir S.V.

Lytvynenko Yu.O.

Keywords: