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Development of geopolymeric binders based on natural and technogenic disperced minerals for hazardous waste conditioning

ABSTRACT

Research report: 58 p., 14 fig., 16 tables, 37 ref.

The object of the research is natural and technogenic dispersed materials as components of geopolymeric binders used for hazardous waste conditioning.

The aim of the work is developing of geopolymeric binders for cementing of hazardous waste into geopolymer composites for long term storage and disposal.

Research methods. Studying of physical and chemical properties of raw materials for geopolymeric binders, preparation of geopolymer components and waste imitators for cementation, production of prototypes and evaluation of their characteristics (porosity, strength and leaching rate).

Summary: Geopolymeric binders for hazardous waste cementation into geopolymer composites for long-term storage and disposal have been developed. Physical and chemical properties of raw materials for the geopolymeric binders have been studied. Components of geopolymeric and waste imitators for cementation have been prepared. Prototypes have been made and their characteristics (porosity, strength and leaching rate) have been evaluated. Structure - formation mechanisms in geopolymers, specifies of preparation of geopolymer constituents and objects for cementation have been considered. Prototypes were made and their characteristics were evaluated by different methods including the factorial experiment. The physical and chemical properties of the raw materials from different supplies may vary. So, special attention should be paid to improving the raw materials quality - selection of necessary fractions, extraction of underburned residues, aluminosilicate microspheres etc. The objects should be pre-treated before cementation, i.e.: transformation of cation exchangers into ash, adsorption of liquid hydrocarbons by solid adsorbents etc. Based on the studied raw materials, geopolymer matrix samples were produced. They have strength above 20MPa and low porosity (<1%). When studying the Cs and Sr leaching from the composites with a LRW imitator, low leaching rate of Sr and insufficient fixation of Cs by the studied geopolymer material were determined. With further development and improvement, these geopolymeric binders can successfully compete with Portland cement-based binders in conditioning of hazardous waste.

Prognostic assumptions regarding the further research - development of the optimal technology for hazardous waste conditioning with geopolymeric cements using new research objects as well. Transition to production of prototypes.

Authors:

Rozko Alla Mykolayivna

Fedorenko Yurii Hryhorovych

Koromyslichenko Taisiia Ivanivna

Snisar Viktor Petrovych

Other authors:

Vozniak D.M.

Kulchetska H.O.

Belskyi V.M.

Lunova I.M.

Somka L.V.

Butnik T.V.

Matveieva T.P.

Kushnir S.V.

Keywords:

hazardous waste, conditioning, geopolymers, alkaline binders, leaching, compressive strength.

Head of the research:

Rozko Alla Mykolayivna

Registration Card (RC):

0122U001706

Execution period of the research:

2022 - 2022