Stabilization–solidification treatment of mine tailings using Portland cement, potassium dihydrogen phosphate and ferric chloride hexahydrate

Desogus, Paolo; Manca, P.; Orrù, G.; Zucca, A.

doi:10.1016/j.mineng.2013.01.003

Cited by 54 publications

(23 citation statements)

References 33 publications

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“…2 , pyromorphite has a much lower solubility and a greater capacity to resist acid or alkaline attack [52,53]. In addition, the solubility of Zn 3 (PO 4 ) 2 ·4H 2 O or CaZn 2 (PO 4 ) 2 ·2H 2 O is much lower than zinc hydroxide (Zn(OH) 2 ), which is the main product involved in the immobilization of Zn(II) with Portland cement [54].…”

Section: Characterization Of the Materialsmentioning

confidence: 99%

Evaluation of Carbonation Effects on Cement‐Solidified Contaminated Soil Used in Road Subgrade

Zhou

Pan

Tang

et al. 2018

Advances in Materials Science and Engineering

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Cement solidification/stabilization is widely used towards contaminated soil since it has a low price and significant improvement for the structural capacity of soil. To increase the usage of the solidified matrix, cement-solidified contaminated soil was used as road subgrade material. In this study, carbonation effect that reflected the durability on strength characteristics of cementsolidified contaminated soil and the settlement of pavement were evaluated through experimental and numerical analysis, respectively. According to results, compressive strengths of specimens with 1% Pb(II) under carbonation and standard curing range from 0.44 MPa to 1.17 MPa and 0.14 MPa to 2.67 MPa, respectively. e relatively low strengths were attributed to immobilization of heavy metal, which consumed part of SiO 2 , Al 2 O 3 , and CaO components in the cement or kaolin and reduced the hydration and pozzolanic reaction materials. is phenomenon further decreased the strength of solidified soils. e carbonation depth of 1% Cu(II) or Zn(II) contaminated soils was 18 mm, which significantly increased with the increase of curing time and contamination concentration. Furthermore, the finite element calculation results showed that surface settlements decreased with the increase of modulus of subgrade and the distance away from the center. At the center, the pavement settlement was proportional to the level of traffic load.

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Section: Characterization Of the Materialsmentioning

confidence: 99%

Evaluation of Carbonation Effects on Cement‐Solidified Contaminated Soil Used in Road Subgrade

Zhou

Pan

Tang

et al. 2018

Advances in Materials Science and Engineering

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“…광미는 고농도의 중금속을 함유하고 있기 때문에 광산주변 수계 및 토양 오염의 주요 원인이 된다 (Park et al 2006, Jeong et al 2015. 광미의 위해도를 저감시키기 위해 고형화/안정화 (Desogus et al 2013)가 적용되고 있지만, 처리 후 광미에 대한 재이용 용도가 불분명하여 적치 또는 매립되고 있는 실정이다 (Bian et al 2012). Acidithiobacillus ferrooxidans와 같 은 철산화균을 이용하여 광미로부터 유용원소를 회수하기 위한 방안으로 활용되어온 생물학적 침출법 (bioleaching) 또한 광미의 위해도 저감기술의 하나로써 활용될 수 있다 (Bosecker 1997, Park et al 2014, Nguyen et al 2015.…”

Section: 서 론unclassified

Application of Galvanic Oxidation and Pyrite Dissolution for Sustainable In-Situ Mine Tailings Treatment

Ju¹,

Jho²,

Nam³

2016

Ecology and Resilient Infrastructure

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ABSTRACT:Mine tailings generated during mining activity often contain high concentrations of heavy metals, with pyrite-containing mine tailings in particular being a major cause of environmental problems in mining areas. Chemical cell technology, or fuel cell technology, can be applied to leach heavy metals in pyrite-containing mine tailings. As pyrite dissolves through spontaneous oxidation (i.e. galvanic oxidation) in the anode compartment of the cell, Fe 3+ , sulfuric acid are generated. A decrease in pH due to the generation of sulfuric acid allows heavy metals to be leached from pyrite-containing mine tailings. In this study, pyrite was dissolved for 4 weeks at 23°C in an acidic solution (pH 2) and in a galvanic reactor, which induces galvanic oxidation, and total Fe leached from pyrite and pH were compared in order to investigate if galvanic oxidation can facilitate pyrite oxidation. The change in the pyrite surface was analyzed using a scanning electron microscope (SEM). Comparing the total Fe leached from the pyrite, there were 2.9 times more dissolution of pyrite in the galvanic reactor than in the acidic solution, and thus pH was lower in the galvanic reactor than in the acidic solution. Through SEM analysis of the pyrite that reacted in the galvanic reactor, linear-shaped cracks were observed on the surface of the pyrite. The study results show that pyrite dissolution was facilitated through the galvanic oxidation in the galvanic reactor, and also implied that the galvanic oxidation can be one remediation option for pyrite-containing mine tailings.

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“…Stabilization-solidification treatment of mine tailings using Portland cement, potassium dihydrogen phosphate and ferric chloride hexahydrate has been presented in Desogus et al (2013). The results obtained are briefly summarized below (optimal ratio of additives).…”

Section: Laboratory Testsmentioning

confidence: 99%

The reuse of abandoned Acquaresi mine voids for storage of the Masua flotation tailings

Manca

Desogus

Orrù

2014

Int J Coal Sci Technol

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Often in abandoned mine sites are present both underground voids produced by mining and the tailings of treatment plant. An interesting solution for the rehabilitation of the sites would be to place the tailings of the process in the underground mining voids, thus obtaining the reclamation of surface areas and the stabilization of abandoned voids to prevent the dangerous phenomena of subsidence. However, these operations require inert waste, which must not be source of pollution, and the choice of a water/solid optimum to ensure good conditions of pumpability.

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Stabilization–solidification treatment of mine tailings using Portland cement, potassium dihydrogen phosphate and ferric chloride hexahydrate

Cited by 54 publications

References 33 publications

Evaluation of Carbonation Effects on Cement‐Solidified Contaminated Soil Used in Road Subgrade

Evaluation of Carbonation Effects on Cement‐Solidified Contaminated Soil Used in Road Subgrade

Application of Galvanic Oxidation and Pyrite Dissolution for Sustainable In-Situ Mine Tailings Treatment

The reuse of abandoned Acquaresi mine voids for storage of the Masua flotation tailings

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