Preparation of magnesium phosphate cement by recycling the product of thermal transformation of asbestos containing wastes

0429017 - ÚTAM 2015 RIV GB eng J - Journal Article
Viani, Alberto - Gualtieri, A. F.
Preparation of magnesium phosphate cement by recycling the product of thermal transformation of asbestos containing wastes.
Cement and Concrete Research. Roč. 58, April (2014), s. 56-66. ISSN 0008-8846. E-ISSN 1873-3948
R&D Projects: GA MŠMT(CZ) LO1219
Institutional support: RVO:68378297
Keywords : cement-asbestos * chemically bonded ceramics * waste management * X-ray diffraction * amorphous material
Subject RIV: JN - Civil Engineering
Impact factor: 2.864, year: 2014
http://www.sciencedirect.com/science/article/pii/S000888461400012X

Asbestos containing wastes have been employed for the first time in the formulation of magnesium phosphate cements. Two samples were mixed with magnesium carbonate and calcined at 1100 and 1300 C. Under these conditions, complete destruction of asbestos minerals is known to occur. The product, containing MgO, after reaction with water-soluble potassium di-hydrogen phosphate, led to the formation of hydrated phases at room temperature. Crystalline and amorphous reaction products were detected, with the latter being likely the meta-stable precursor of the former. Measured strengths were found to be in line with data from the literature, suggesting that this material may be used as cement. The process here described represents a viable recycling opportunity for this class of hazardous wastes. Simultaneous destruction of asbestos minerals and formation of reactive MgO during thermal treatment, bring benefits in terms of energy requirements and preservation of natural resources in cement manufacturing.
Permanent Link: http://hdl.handle.net/11104/0234213