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X JORNADA DE INVESTIGACIÓN EN CIENCIAS EXPERIMENTALES Y DE LA SALUD UNIVERSIDAD DE NAVARRA Libro de resúmenes PAMPLONA, 6 DE ABRIL DE 2017

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Page 1: X JORNADA DE INVESTIGACIÓN EN CIENCIAS EXPERIMENTALES … · x jornada de investigaciÓn en ciencias experimentales y de la salud universidad de navarra libro de resúmenes pamplona,

X JORNADA DE INVESTIGACIÓN EN

CIENCIAS EXPERIMENTALES Y DE LA

SALUD

UNIVERSIDAD DE NAVARRA

Libro de resúmenes

PAMPLONA, 6 DE ABRIL DE 2017

Page 2: X JORNADA DE INVESTIGACIÓN EN CIENCIAS EXPERIMENTALES … · x jornada de investigaciÓn en ciencias experimentales y de la salud universidad de navarra libro de resúmenes pamplona,

X Jornada de Investigación en Ciencias Experimentales y de la Salud de la Universidad de Navarra

71

FÍSICA, QUÍMICA y

MATEMÁTICAS

Page 3: X JORNADA DE INVESTIGACIÓN EN CIENCIAS EXPERIMENTALES … · x jornada de investigaciÓn en ciencias experimentales y de la salud universidad de navarra libro de resúmenes pamplona,

X Jornada de Investigación en Ciencias Experimentales y de la Salud de la Universidad de Navarra

76

Póster nº 57

Física, Química y Matemáticas

SOLIDIFICATION/STABILIZATION OF HAZARDOUS WASTES FROM THE MINE “LA PRIETA” IN HIDALGO DEL PARRAL, CHIHUAHUA, MEXICO

Jesús Fidel González Sánchez, José María Fernández Álvarez,

José Ignacio Álvarez Galindo, Íñigo Navarro-Blasco

Departamento de Química, Universidad de Navarra

e-mail: [email protected]

The mining industry of Mexico is one of the oldest and most useful activity for the Mexican economy,

however it has a high environment impact from the subsoil to the atmosphere. It generates a large amount of

solid, liquid and gaseous wastes. The most impacted mining wastes are tailings due to the high content of

toxic components.

One of the most widespread alternatives for handling toxic metal is the blocking in a manageable solid

system which allows the proper solidification/stabilization (S/S) of hazardous components and its subsequent

safe disposal.

Ordinary Portland Cement (OPC) has been widely studied to retain potentially toxic heavy metals, but the

use of other alternative binders is receiving growing attention. For instance, the use of Calcium Aluminate

Cement (CAC) to safely encapsulate hazardous materials has proved to be highly effective.

In this study both binding matrices, OPC and CAC, were assayed to encapsulate loaded naturally toxic metal

mining tailings with the aim to obtain a waste-containing solid block with improved management and

successfully disposal. A semi-dynamic Tank Test (EA NEN 7375, 2004) was applied in elucidating leaching

mechanisms and to evaluate the supporting evidence in solidify/stabilize of these hazardous wastes in this

type of cement-based matrices.

Page 4: X JORNADA DE INVESTIGACIÓN EN CIENCIAS EXPERIMENTALES … · x jornada de investigaciÓn en ciencias experimentales y de la salud universidad de navarra libro de resúmenes pamplona,

Dónde:

Stabilization/solidification of hazardous wastes from the mine “La Prieta” in Hidalgo del Parral, Chihuahua, Mexico

González Sánchez, Jesús Fidel; Fernández Álvarez, José María; Álvarez Galindo, José Ignacio; Navarro-Blasco, IñigoInorganic materials and environment research Group (MIMED). Department of Chemistry

INTRODUCTIONThe mining industry of Mexico is one of the oldest and most useful activity for the Mexican economy [1]. However, it has a high environment impact from the subsoil

to the atmosphere. It generates a large amount of solid, liquid and gaseous wastes. Due to the high content of toxic components, tailings are the most impacted

mining wastes[2]. The blocking in a manageable solid system is the most widespread alternative for handling toxic metal. It allows the proper

solidification/stabilization (s/s) of hazardous components and its subsequent safe disposal.

Ordinary portland cement (OPC) has been widely studied to retain potentially toxic heavy metals, but the use of other alternative binders is receiving growing

attention. For instance, the use of calcium aluminate cement (CAC) to safely encapsulate hazardous materials has proved to be highly effective [3].

OBJECTIVEThe binding matrices, OPC, calcium aluminate cement white (CACw) and calcium

aluminate cement dark (CACd) to encapsulate loaded naturally toxic metal mining

tailings with the aim to obtain a waste-containing solid block with improvedmanagement and successfully disposal, were assayed.

AREA OF STUDY AND SAMPLINGThe sampling was carried out at the mine "La Prieta" Hidalgo del Chihuahua, Mexico,

in according with the specifications described by official norm NMX-AA-132-SCFI-2006.

LEACHING TESTThe cylindrical specimens were subjected to the tank test according to EA NEN 7375

standard, which consists of placing in methacrylate containers and filled with 1 liter of

neutral pH demineralized water in order to obtain the leachate, over a period of 64

days, as shown in figures:

In addition, the characteristics of the monolithic structures were studied, obtaining

the following resistance to compression and porosity profiles:

SOLUTIONIn order to treat the toxic elements, the Stabilization /Solidification in cement

matrices was used, for which the following materials were used:

CUANTIFICATION OF THE TOXIC ELEMENTSThe collected samples were subjected to acid digestion to analyze potentially toxic

elements following the methodology of the EPA-3050b standard. The elements

quantified by the atomic absorption spectrophotometry method were As, Pb and Zn,

where the following levels were found:

A sample of the leachate was collected and drained off at eight different times (0.25,

1, 2.25, 4, 9, 16, 36 and 64 days) then it was analyzed using atomic absorption

spectrophotometry to quantify the amount of pollutant in the leachate , obtaining the

following retaining results:

CONCLUSION

1. The stabilization/solidification treatment is adequate to treat mining tailings, due to

more than 98% of the contaminants are encapsulated in addition that the Pb, As and

Zn concentrations are high in the study area.

2. A thorough selection of the binder material should be carried out. As it happened

with this kind of tailing samples, the high sulphate content has brought to the form of

an expansive compound, ettringite, by reaction with the high alumina content in CAC

mortars, which make the monolithic unable to encapsulate the mining waste.

3. OPC mortar is a more appropriate system to encapsulate load naturally toxic metal

mining tailings from the mine “La Prieta” in Hidalgo del Parral, Mexico.

0100020003000400050006000700080009000

100001100012000

HP2 HP3 HP5 HP7 HP16 HP17

Co

nce

ntr

atio

n (

mg

/kgs

oil)

Samples

Zn Pb As

OPC CACw CACdMIX 1 MIX 2 MIX 1 MIX 2 MIX 1 MIX 2

Substitution

aggregate50 % 15% 50 % 15 % 50 % 15 %

Cement 34 34 32 32 35 35

Siliciuos Agregate 29 50 31 52 29 49

Mine Waste 29 9 31 9 29 9

HMP 7 7 6 6 7 7

Water 13 13 12 12 12 12

CharacteristicsReleases heat

in the reaction-

Expansion

of the test

piece

Expansion

of the test

piece

Releases heat

in the reaction and

expansion

of the test piece

Releases heat

in the reaction and

expansion

of the test piece

(only test piece HP3)

0

20

40

60

80

100

HP2 HP3 HP5 HP7 HP16 HP17

LOA

D (

MPA

)

SAMPLE

Compresive strength

OPC 50%

OPC 15%

CACd 15%

90.0

91.0

92.0

93.0

94.0

95.0

96.0

97.0

98.0

99.0

100.0

HP2 HP3 HP5 HP7 HP16 HP17

RET

AIN

ED %

SAMPLE

Retained Zn

OPC 50%

OPC 15%

CACd 15%

90.0

91.0

92.0

93.0

94.0

95.0

96.0

97.0

98.0

99.0

100.0

HP2 HP3 HP5 HP7 HP16 HP17

RET

AIN

ED%

SAMPLE

Retained Pb

OPC 15%

OPC 50%

CACd 15%

90.0

91.0

92.0

93.0

94.0

95.0

96.0

97.0

98.0

99.0

100.0

HP2 HP3 HP5 HP7 HP16 HP17

RET

AIN

ED %

SAMPLE

Retained As

OPC 50%

OPC 15%

CACd 15%

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

0.001 0.01 0.1 1 10 100 1000

Log

Dif

fere

nti

al

Intr

usi

on

(m

L g

-1)

Pore Size Diameter (µm)

OPC 50%

HP2

HP3

HP5

HP7

HP16

HP17

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

0.001 0.01 0.1 1 10 100 1000

Log

Dif

fere

nti

al

Intr

usi

on

(m

L g

-1)

Pore Size Diameter (µm)

OPC 15%HP2

HP3

HP5

HP7

HP16

HP17

0.00

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.001 0.01 0.1 1 10 100 1000

Log

Dif

fere

nti

al

Intr

usi

on

(mL

g-1

)

Pore Size Diameter (µm)

CACd 15 %

HP2

HP5

HP7

HP16

HP17

Porosimetry

References[1]Cortinas, C. 2007. Instituto Nacional de Ecología. Instituto Nacional de Ecología. http://www2.inecc.gob.mx/publicaciones/gacetas/155/cortinas.html.

[2]Griffin, R. D. 2009. Principles of Hazardous Materials Management. Michigan : CRC Press, 2009.

[3]Lasheras-Zubiate M., Navarro-Blasco I., Fernández J.M., Álvarez J.I., 2012 Encapsulation, solid-phase identification and leaching of toxic metals in cement systems modified

by natural biodegradable polymers, J. Hazard. Mater. 233–234 (2012) 7–17.[4]EA NEN 7375, Leaching characteristics of moulded or monolithic building and waste materials, Determination of leaching of inorganic components with the diffusion test, 2004.

OPC 15%

OPC 50%

CACw 15% & 50%

CACd 15%

CACd 50%