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  • Morin, Dominique, et al. (författare)
  • BioMinE : integrated project for the development of biotechnology for metal-bearing materials in Europe
  • 2006
  • Ingår i: EC 6th Framework Programme, IP Biomine project NMP-2002- - : Elsevier. ; 83:1-4, s. 69-76
  • Tidskriftsartikel (refereegranskat)abstract
    • Biohydrometallurgy is the offspring of the unexpected union of biotechnology and metallurgy. From specific properties of some extreme biotopes, active principles of interactions between microbial metabolisms and minerals have been extracted to be used as efficient metallurgical processes.Many profitable industrial operations based on these bioprocesses have been running to recover copper, gold, uranium or cobalt for instance and many other applications have been designed.Europe was quite active in this area in the past, but currently the leadership is in South Africa, America and Australia.BioMinE (Biotechnology for Metal-bearing material In Europe) is a large integrated project launched with the support of the European Commission. It is aimed at stimulating synergies between the most relevant universities, research and industrial organisations to develop new concepts in this technical field that allow a better exploitation of the mineral resources in the future.The main technical subject is the investigation of the opportunities to apply bioleach processes to primary and secondary resources of metal-bearing materials. The second technical area of the project in terms of effort is the study of the recovery of metals from pregnant bioleach solution using biological reagents. All along the project duration, these investigations are focussed on the relevant resources in Europe screened according to an iterative process. The integration of the innovative pathways of processing will be evaluated up to the pilot scale whenever it is appropriate.The Consortium of BioMinE comprises 35 partners from industry (12 including 5 SMEs) research organisations (9) universities (14) and government (2). The participants are from 12 EU member states, from 1 candidate country (Romania), and from South Africa (INCO Country).The overall budget of the project is 17.9 million Euros, with a contribution from the European Commission of 11.6 million Euros. Started on November 1, 2004, the project will last 4 years.An overview of BioMinE in the general context of the biohydrometallurgy development is the subject of this presentation.
  • Ayyala, Sekhar, et al. (författare)
  • Effect of corrosion inhibitors on grinding and flotation of a lead-zinc ore
  • 1993
  • Ingår i: Minerals Engineering. - 0892-6875 .- 1872-9444. ; 6:8, s. 929-935
  • Tidskriftsartikel (refereegranskat)abstract
    • Grinding and flotation experiments on a Pb-Zn ore were carried out to evaluate: 1) wear of the grinding media both in the presence and absence of an inhibitor and 2) effect of the inhibitor on the flotation of Pb---Zn minerals. The percentage reduction in the wear of the grinding media was observed to be between 25–36%, depending on the type of the inhibitor and its critical concentration. The inhibitors used in the investigation were sodium sulphite, sodium nitrite, sodium chromate and sodium silicate. The results indicate that a specific corrosion inhibitor, for example sodium sulphite, may give better recoveries and grades in flotation but is not as efficient as sodium chromate in inhibiting the wear of the grinding media. Pulp solutions (after grinding) analysed for metal ion concentrations showed low Fe. Iron released into the solution as a result of corrosion reactions subsequently forms insoluble hydroxy complexes and may coat the mineral surfaces. Such hydrophilic coatings may adversely affect the floatabilities of minerals. The particle size analysis of the ground product has been carried out and the results are discussed.
  • Forssberg, Eric, et al. (författare)
  • Review of plastics waste recycling and the flotation of plastics
  • 1999
  • Ingår i: Resources, Conservation and Recycling. - 0921-3449 .- 1879-0658. ; 25:2, s. 85-109
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper summarizes the importance of plastic waste recycling and plastic waste separation. Based on an analysis of the physical and chemical characteristics of plastics and plastic waste, the potentials and limitations of several technological processes are discussed. In addition, a review of the surface chemical aspects of plastic flotation is presented. It can be concluded that the flotation of plastics is a fairly flexible technique and could prove to be a useful process for the separation of mixtures of several different types of plastics. However, more research and development effort is required before this technology can be introduced to industry.
  • Moosberg-Bustnes, Helena, et al. (författare)
  • The function of fillers in concrete
  • 2004
  • Ingår i: Materials and Structures. - 1359-5997 .- 1871-6873. ; 37:2, s. 74-81
  • Tidskriftsartikel (refereegranskat)abstract
    • The purpose of this investigation has been to evaluate the effect of quartz filler on concrete strength and microstructure, and to see if it is possible to replace cement with filler without loss of strength. Fillers are materials whose function in concrete is based mainly on size and shape. They can interact with cement in several ways; to improve particle packing and give the fresh concrete other properties, and even to reduce the amount of cement in concrete without loss of strength. Quartz was chosen as filler material, since it is inert and is available both as a by-product and a natural raw material. Different amounts of filler were used in the various experiments, as well as different particle size distributions. The results are positive: fillers can partially replace cement and at the same time improve the properties and the microstructure of the concrete. This research is part of a larger project that aims to find uses for by-products in concrete.
  • Shen, H, et al. (författare)
  • Selective flotation separation of plastics by chemical conditioning with methyl cellulose
  • 2002
  • Ingår i: Resources, Conservation and Recycling. - 0921-3449 .- 1879-0658. ; 35, s. 229-241
  • Tidskriftsartikel (refereegranskat)abstract
    • The floatability of seven plastics (POM, PVC, PET, PMMA, PC, PS and ABS) in the presence of methyl cellulose (MC) and separation of plastics mixtures were investigated in this paper. It was found that the seven plastics can be separated into three groups by using the wetting agent MC. Group one includes POM and PVC. They are depressed at very low MC concentrations. Group two, including PET, PMMA and PC, has an intermediate floatability. Group three (ABS and PS) has a high floatability. They are almost not depressed within the given MC concentration range. In order to understand the mechanism of selective flotation of plastics and the chemical conditioning process, surface chemical factors, such as wettability of plastics and surface tension of flotation medium, and gravity factors, such as particle density and shape, were studied. It was found that the depressing effect of MC on plastics is ascribed mainly to its adsorption on the plastics surfaces. The MC molecules absorbed on plastics expose some of their polar groups oriented towards the aqueous phase, hence making the plastics surfaces hydrophilic. In addition, flotation selectivity for the plastics is dominated not only by wettability of plastics, but also by particle size, density and shape
  • Wang, Y, et al. (författare)
  • Hydrophobic magnetite seeding of hematite ultrafines in high gradient magnetic separation
  • 1993
  • Ingår i: Minerals Engineering. - 0892-6875 .- 1872-9444. ; 6, s. 537-546
  • Tidskriftsartikel (refereegranskat)abstract
    • The application of hydrophobic magnetite seeding to concentrate hematite ultrafines (<10 µm) in slimes using a high gradient magnetic separator (HGMS) with coarse expanded metal matrices was investigated. It was shown that the selective aggregation at high shear rate of the seeded hematite particles (produced by surface treatment with sodium oleate and colloidal magnetite) could significantly enhance the HGMS capture of hematite ultrafines. The mechanism of selective aggregation was discussed in terms of the combination of hydrophobic and magnetic interactions.
  • Westerholm, Mikael, et al. (författare)
  • Rheological properties of micromortars containing fines from manufactured aggregates
  • 2006
  • Ingår i: Materials and Structures. - 1359-5997 .- 1871-6873. ; 40:6, s. 615-625
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper concerns the influence of fines from manufactured aggregates on the rheological properties of the micromortar phase of concrete. Fines from nine different aggregates were included in the experimental work. The zeta potential of five of them was measured at different additions of superplasticizer in order to study the interaction between the surface of the fines and the superplasticizer. The rheological properties of the micromortars were studied at different volume concentrations of fines and at different concentrations in the paste phase, i.e., w/c ratios. Furthermore, the micromortars were studied at different dosages of a superplasticizer. The results show that the fines have different surface properties, i.e., zeta potential, and indicate that the superplasticizer only is adsorbed on some of them. The results from the rheological characterisation of the micromortars indicate that the higher water demand of concrete with manufactured aggregates partly can be traced to the properties of the micromortar phase of the concrete.
  • Abramov, A.A., et al. (författare)
  • Chemistry and optimal conditions for copper minerals flotation : theory and practice
  • 2005
  • Ingår i: Mineral Processing and Extractive Metallurgy Review. - 0882-7508 .- 1547-7401. ; 26:2, s. 77-143
  • Tidskriftsartikel (refereegranskat)abstract
    • Reliable information on the surface state of sulphide copper minerals and regularities of sulphidization and flotation of oxidized copper minerals, the composition of sorption layer on the mineral surface forming during its interaction with xanthate or dixanthogen, and the influence of collector forms sorption on the copper minerals floatability and on the optimal conditions for these minerals flotation and depression has been obtained at present. The determined physicochemical models in the form of quantitative equations have been derived for the optimal conditions of flotation and depression of copper minerals under changing pH value and of sodium sulphide, lime, cyanide, zinc–cyanide complexes additions. The equations derived were proven in the laboratory and industrial scale and can be used both in automatic control systems at plants and for improvement of technological processes of selective flotation of copper containing ores.
  • Ahlberg, E., et al. (författare)
  • The surface oxidation of pyrite in alkaline solution
  • 1990
  • Ingår i: Journal of Applied Electrochemistry. - 0021-891X .- 1572-8838. ; 20:6, s. 1033-1039
  • Tidskriftsartikel (refereegranskat)abstract
    • The collector-less flotation of pyrite has been studied by conventional techniques and is correlated to the electrochemical behaviour of pyrite in alkaline solution (1m NaClO4, pH 11). It was concluded that the initial oxidation of pyrite produces a hydrophobic sulphur rich surface together with hydrophilic iron hydroxide species. Also upon grinding, the surface is covered by hydrophilic species and therefore no significant flotation was obtained in the absence of a collector. However, collectorless flotation was readily obtained in an iron complexing solution like EDTA. This indicates that the remaining sulphur-rich layer is responsible for the floatability of pyrite under these conditions
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