Properties of Cement Paste Using Mine Tailing and Polymer Materials

2009 ◽  
Vol 620-622 ◽  
pp. 623-626 ◽  
Author(s):  
Kyung Nam Kim ◽  
Jin Ho Kim ◽  
Dae Yong Shin ◽  
Beom Goo Lee ◽  
Hyun Park
Keyword(s):  
Heavy Metal ◽  
Compressive Strength ◽  
Metal Ions ◽  
Mine Tailings ◽  
Heavy Metal Ions ◽  
Fluorescence Analysis ◽  
Polymer Materials ◽  
Distilled Water ◽  
Cement Pastes ◽  
X Ray

In this study, mine tailings obtained in a region near to Youngwol Sangdong(Korea) was used to investigate the contamination of heavy metal ions. Some amount of mine tailings and lignin(AE agent) were added in the general cement pastes, of which the compressive strength and leaching rate were investigated. X-ray fluorescence analysis shows that the major constituents of mine tailings are 56.9wt% of SiO2, 10.8wt% of Fe2O3, 11.2wt% of CaO and 11.4wt% of Al2O3, and the major phases are quartz and calcite. In the content of heavy metal ions, the concentration of As ion is the highest as 257.261mg/ℓ. When mine tailings and lignin were added in cement pastes, the compressive strength was higher in the cement pastes adding only lignin. Lignin addition significantly improved the compressive strength of cement pastes by approximately 15% when being cured in distilled water. The compressive strength was lower in the cement pastes adding mine tailings than in the cement pastes not adding. The leaching rates of Cr, Pb and As ion in distilled water were decreased in the cement pastes adding lignin, compared to in the cement pastes not adding. The leaching rates of all heavy metal ions in the cement pastes curing for 28 days were within the maximum permitted limits in KSLT and EPT method. Therefore, it is thought that mine tailings can be used as an ecological material.

Solvent extraction-microdroplet x-ray fluorescence analyses of trace amounts of heavy metal ions

1984 ◽  
Vol 13 (2) ◽  
pp. 83-86 ◽  
Author(s):  
Michihiro Murata ◽  
Masayuki Omatsu ◽  
Syuji Mushimoto
Keyword(s):  
Heavy Metal ◽  
Solvent Extraction ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
X Ray

Experimental Research on Engineering Property of Heavy Metal-Contaminated Kaolinite

2011 ◽  
Vol 94-96 ◽  
pp. 1921-1929 ◽  
Author(s):  
Zhi Bin Liu ◽  
Xin Ma ◽  
Wen Long Dai
Keyword(s):  
Heavy Metal ◽  
Compressive Strength ◽  
Electrical Resistivity ◽  
Metal Ions ◽  
Unconfined Compressive Strength ◽  
Heavy Metal Ions ◽  
Engineering Property ◽  
Contamination Concentration ◽  
Expansion Capacity

Due to release and accumulation of industrial contaminants in natural soil in some regions, and the long-term interaction between leachate and clay which is adopted as isolation material of contaminants, the engineering property variation of clay soils after having been polluted by heavy metal ions gradually has drawn more and more attention of environmental geotechnical engineers. With relatively high chemical stability and low expansion coefficient kaolinite is widely distributed and usually used in engineering practice. In this research, Pb, Zn, and Cu-contaminated kaolinite specimens of controlled initial dry density and water content were manually prepared through static compaction. Then expansion capacity, unconfined compression, electrical resistivity and one-dimensional consolidation tests were conducted. It is found that the expansion capacity of contaminated kaolinite is influenced by the type and concentration of heavy metal ion. The unconfined compressive strength of heavy metal-contaminated kaolinite is decreased in a short period, but it may increase in a long term. Unconfined compressive strength of the same type of heavy metal-contaminated kaolinite will change with the contamination concentration. The electrical resistivity of kaolinite would be decreased when contaminated by heavy metal ions. The higher the contamination concentration is, the lower the electrical resistivity will be. All the compression indexes of heavy metal-contaminated kaolinite become lower than that of the clean kaolinite, and it also depends on both the type of heavy metal and contamination concentration. For the three types of heavy metal ions, Pb has the greatest influence on the engineering property of kaolinite, while the effects of Zn and Cu are quite similar.

Study on the antiseepage mechanism of the PBFC slurry for landfill site

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744087 ◽  
Author(s):  
Guozhong Dai ◽  
Weicheng Shi ◽  
Xiaoshu Jiang ◽  
Guicai Shi ◽  
Yaxing Zhang
Keyword(s):  
Heavy Metal ◽  
Compressive Strength ◽  
Fly Ash ◽  
Polyvinyl Alcohol ◽  
Metal Ions ◽  
Sodium Carbonate ◽  
Heavy Metal Ions ◽  
Landfill Site ◽  
Low Permeability ◽  
Coefficient Of Permeability

In order to develop a kind of slurry with low permeability which has some adsorption and retardation to the pollutants in leachate to be used in antiseepage engineering of leachate for landfill site, experiments based on orthogonal method were performed. The optimal PBFC slurry was selected: bentonite 18–26%, cement 16–24%, fly ash 18–20%, TOJ800-10 water reducing agent 0.01–0.03%, polyvinyl alcohol 0.2–0.8%, sodium carbonate 0.8–1.5% and water 680–780/1000 mL seriflus. The material has good groutability and a concretion stone ratio which is greater than 99.6%. The coefficient of permeability of 28-day concretion body is 0.53 × 10[Formula: see text]–1.86 × 10[Formula: see text] cm/s and the compressive strength is 0.64–1.04 MPa. The slurry has good adsorption and retardation properties. The block rate of NH4-N and phosphorus reached 98.28%, and the block rate of CODCr and BOD5 reached 85.67%. The block rate of Hg, Pb and other heavy metal ions reached 99.8%. The PBFC slurry improved the retardation capability of the pollutants of the leachate at the landfill site by its infiltration sedimentation and adsorption fixation.

scholarly journals Absorbed Pb2+ and Cd2+ Ions in Water by Cross-Linked Starch Xanthate

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Kai Feng ◽  
Guohua Wen
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Adsorption Mechanism ◽  
Potato Starch ◽  
Sodium Acrylate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Concentration Of Ions ◽  
Cross Linker

A cross-linked starch xanthate was prepared by graft copolymerization of acrylamide and sodium acrylate onto starch xanthate using potassium persulfate and sodium hydrogen sulfite initiating system and N,N′-methylenebisacrylamide as a cross-linker. As this kind of cross-linked potato starch xanthate can effectively absorb heavy metal ions, it was dispersed in aqueous solutions of divalent heavy metal ions (Pb2+ and Cd2+) to investigate their absorbency by the polymer. Factors that can influence absorbency were investigated, such as the ratio of matrix to monomers, the amount of initiator and cross-linker, pH, and the concentration of metal ions. Results were reached and conclusion was drawn that the best synthetic conditions for the polymer adsorbing Pb2+ and Cd2+ were as follows: the quality ratio of matrix to monomers was 1 : 12 and 1 : 11, the amount of initiator was 2.4% and 3.2% of matrix, and the amount of cross-linker was 12 mg and 13 mg. When the initial concentration of ions was 10 mg/L, the highest quantities of adsorption of Pb2+ and Cd2+ were 47.11 mg/g and 36.55 mg/g. Adsorption mechanism was discussed by using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), Energy Dispersive X-Ray Spectroscopy (EDS) test, and adsorption kinetic simulation.

scholarly journals Fabrication ofγ-Fe2O3Nanoparticles by Solid-State Thermolysis of a Metal-Organic Framework, MIL-100(Fe), for Heavy Metal Ions Removal

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Shengtao Hei ◽  
Yan Jin ◽  
Fumin Zhang
Keyword(s):  
Heavy Metal ◽  
Water Treatment ◽  
Solid State ◽  
Metal Ions ◽  
Photoelectron Spectroscopy ◽  
Heavy Metal Ions ◽  
X Ray ◽  
Metal Organic ◽  
Heavy Metal Ions Removal ◽  
Metal Ions Removal

Porousγ-Fe2O3nanoparticles were prepared via a solid-state conversion process of a mesoporous iron(III) carboxylate crystal, MIL-100(Fe). First, the MIL-100(Fe) crystal that served as the template of the metal oxide was synthesized by a low-temperature (<100°C) synthesis route. Subsequently, the porousγ-Fe2O3nanoparticles were fabricated by facile thermolysis of the MIL-100(Fe) powders via a two-step calcination treatment. The obtainedγ-Fe2O3was characterized by X-ray diffraction (XRD), N2adsorption, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) techniques, and then used as an adsorbent for heavy metal ions removal in water treatment. This study illustrates that the metal-organic frameworks may be suitable precursors for the fabrication of metal oxides nanomaterials with large specific surface area, and the prepared porousγ-Fe2O3exhibits a superior adsorption performance for As(V) and As(III) ions removal in water treatment.

Removal of lead(II) and copper(II) from aqueous solution using foitite from Linshou mine in Hebei, China

2011 ◽  
Vol 64 (8) ◽  
pp. 1620-1628 ◽  
Author(s):  
Dengliang He ◽  
Guangfu Yin ◽  
Faqin Dong ◽  
Laibao Liu ◽  
Xiaoli Tan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Metal Uptake ◽  
Energy Dispersive Spectrometer ◽  
Hebei Province ◽  
X Ray Diffraction ◽  
X Ray ◽  
Laser Raman

Foitite from Linshou mine in China's Hebei province was investigated as an adsorbent to remove Pb(II) and Cu(II) from aqueous solution. The results showed that foitite can readily remove heavy metal ions from aqueous solution. The data shows that the metal uptake for Pb(II) increases rapidly, accounting for 74.47% when contact time was 2 min. In contrast to Pb(II), there was a worse capability for adsorption of Cu(II). In the first 4 min, the metal uptake accounted for 34.7%. According to the analytical results obtained from X-ray diffraction, laser Raman spectrum, X-ray energy dispersive spectrometer, and Zeta potential, the removal mechanism of Pb(II) and Cu(II) by using foitite can be explained as following: firstly, the existence of an electrostatic field around foitite particles can attract heavy metal ions and consequently combine heavy metal ions with OH−; secondly, heavy metal ions in the solution are exchanged with the Fe3+ and Al3+ in the foitite.

scholarly journals Using the mineral component of building refuse in heavy metals sorption from their mixture

2021 ◽  
Vol 8 (1) ◽  
pp. 20218112
Author(s):  
V. M. Yurk ◽  
O. B. Zaytsev ◽  
A. V. Zaytseva ◽  
N. A. Malahova
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Ions ◽  
Atomic Absorption ◽  
Atomic Absorption Spectroscopy ◽  
Heavy Metal Ions ◽  
Distilled Water ◽  
Mineral Component ◽  
Residual Concentration ◽  
Technogenic Soils

The sorption properties of the sand-breakstone mixture based on the mineral component of building refuse of the 0-10 mm fraction with respect to Pb2+, Zn2+, Cu2+, Ni2+, Cd2+ and Hg2+ ions were studied using atomic absorption spectroscopy. The mechanisms of accumulation of heavy metal ions on the surface of the mixture particles are described. It was found that after washing the contaminated material distilled water, the residual concentration of metals in the filtrate does not exceed the established sanitary and hygienic standards. The practical value of the work lies in the possibility of applying the results in reclamation of technogenic formations or production of materials for the technical stage of reclamation using technogenic soils.

Sign in / Sign up

Export Citation Format

Share Document