Leaching behaviour of magnesium phosphate cements containing high quantities of heavy metals

Buj, Irene; Torras, Josep; Rovira, Miquel; Pablo, Joan de

doi:10.1016/j.jhazmat.2009.10.077

Cited by 165 publications

(56 citation statements)

References 19 publications

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“…Under these pH conditions, these diagrams showed that Zn would prevail as cationic aquosols, Zn 2+ or Zn(OH) + , while either Pb or Cu would be mainly precipitated as insoluble hydroxydes and oxides (Pb(OH) 2 and CuO, respectively) (Liu and Liu, 2003;Protopopoff and Marcus, 2005). The formation of these insoluble compounds in the case of Pb and Cu also agrees with data reported in magnesium phosphate cements by Buj and co-workers (Buj et al, 2010). …”

Section: Metal-binder Interactionsupporting

confidence: 89%

Treatment of toxic metal aqueous solutions: Encapsulation in a phosphate-calcium aluminate matrix

Fernández

Navarro-Blasco

Durán

et al. 2014

Journal of Environmental Management

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Polyphosphate-modified calcium aluminate cement matrices were prepared by using aqueous solutions polluted with toxic metals as mixing water to obtain wastecontaining solid blocks with improved management and disposal. Synthetically contaminated waters containing either Pb or Cu or Zn were incorporated into phosphoaluminate cement mortars and the effects of the metal's presence on setting time and mechanical performance were assessed. Sorption and leaching tests were also executed and both retention and release patterns were investigated. For all three metals, high uptake capacities as well as percentages of retention larger than 99.9% were measured. Both Pb and Cu were seen to be largely compatible with this cementitious matrix, rendering the obtained blocks suitable for landfilling or for building purposes. However, Zn spoilt the compressive strength values because of its reaction with hydrogen phosphate anions, hindering the development of the binding matrix.

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Section: Metal-binder Interactionsupporting

confidence: 89%

Treatment of toxic metal aqueous solutions: Encapsulation in a phosphate-calcium aluminate matrix

Fernández

Navarro-Blasco

Durán

et al. 2014

Journal of Environmental Management

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“…In OPC mortars metal retention values ranged from 99.82 to 99.97% for Pb, from 99.85 to 99.91% for Zn and from 99.96 to 99.99% for Cu [51]; in magnesium phosphate cements, retention levels higher than 99% for Pb and higher than 95% for Zn and Cu were reported [52] and retention values of 81% and 87% for Pb and Zn were reported for toxic metals immobilized by cement rotary-kiln co-processing [53]. In this study, the use of CAC clearly enhanced all the values that had previously been reported.…”

Section: Leaching Testsmentioning

confidence: 95%

Solidification/stabilization of toxic metals in calcium aluminate cement matrices

Navarro-Blasco

Durán

Sirera

et al. 2013

Journal of Hazardous Materials

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The ability of calcium aluminate cement (CAC) to encapsulate toxic metals (Pb, Zn and Cu) was assessed under two curing conditions. Changes in the consistency and in the setting time were found upon the addition of the nitrates of the target metals. Both Pb and Cu caused a delay in CAC hydration, while Zn accelerated the stiffening of the mortar. Compressive strengths of the metal-doped mortars, when initially cured at 60ºC/100% RH, were comparable with that of the free-metal mortar. Three different pore size distribution patterns were identified and related to the compounds identified by XRD and SEM. Sorbent capacities of CAC for the toxic metals were excellent: a total uptake was achieved for up to 3 wt.% loading of the three metals. In this way, CAC mortars were perfectly able to encapsulate the toxic metals, allowing the use of CAC for waste management as proved by the leaching tests.

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“…This risk particularly concerns the increased content of certain harmful substances, such as heavy metals, which, as a result of contact with the water, can leach into the surrounding environment [5]. Many environmental studies carried out on cementitious materials with wastes from other industries have shown that these materials have a high degree of immobilization of heavy metals [3,[6][7][8][9][10][11][12][13][14][15]. This is due to the properties of hardened cement matrix, which has been used for many years as an effective and safe material in the process of permanent solidification of hazardous waste [10,12,16].…”

Section: Introductionmentioning

confidence: 99%

Leaching of heavy metals from cementitious composites made of new ternary cements

Kuterasińska-Warwas

Król

2017

E3S Web Conf.

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Abstract. The paper presents a comparison of research methods concerning the leaching of harmful substances (selected heavy metal cations ie. Pb, Cu, Zn and Cr) and their degree of immobilization in cement matrices. The new types of ternary cements were used in the study, where a large proportion of cement clinker was replaced by other non-clinker components -industrial wastes, ie. siliceous fly ash from power industry and granulated blast furnace slag from the iron and steel industry. In studied cementitious binders also ground limestone was used, which is a widely available raw material. The aim of research is determining the suitability of new cements for neutralizing harmful substances in the obtained matrices. The application of two research methods in accordance with EN 12457-4 and NEN 7275 intends to reflection of changing environmental conditions whom composite materials may actually undergo during their exploitation or storing on landfills. The results show that cements with high addition of non-clinker components are suitable for stabilization of toxic substances and the obtained cement matrices retain a high degree of immobilization of heavy metals at the level of 99%.

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Leaching behaviour of magnesium phosphate cements containing high quantities of heavy metals

Cited by 165 publications

References 19 publications

Treatment of toxic metal aqueous solutions: Encapsulation in a phosphate-calcium aluminate matrix

Treatment of toxic metal aqueous solutions: Encapsulation in a phosphate-calcium aluminate matrix

Solidification/stabilization of toxic metals in calcium aluminate cement matrices

Leaching of heavy metals from cementitious composites made of new ternary cements

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