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Comparative Evaluation of Anti-Corrosion Coatings for NdFeB-Type Magnets with Respect to Performance and Recyclability via Hydrogen-Assisted Recycling (HPMS) 钕铁硼型磁体防腐涂层性能及氢辅助回收性能的对比评价
Pub Date : 2021-12-28 DOI: 10.3390/materproc2021005087
C. Burkhardt, A. Lehmann, P. Fleissner, Laura Grau, Mirko Trautz, Maximilian Mungenast, B. Podmiljšak, S. Kobe
Various anti-corrosion coatings used on commercially available NdFeB-type magnets were comparatively examined for their durability and suitability for magnet reprocessing by hydrogen-assisted recycling (HPMS). Layer thickness and structure were determined by systematic microstructural analysis, and a standardized corrosion test was used to assess the durability of each layer. Chemical composition of the coatings was analyzed using SEM/EDS and ICP-OES. HPMS behavior was investigated using in situ video monitoring. The results of the presented investigations are an important contribution for the implementation of a sorting and labeling system to support and facilitate a commercially viable recycling of permanent magnets on an industrial scale.
对比研究了市售钕铁硼型磁体上使用的各种防腐涂层的耐久性和氢辅助回收(HPMS)磁体再处理的适用性。通过系统的显微组织分析确定各层的厚度和结构,并采用标准化腐蚀试验评估各层的耐久性。采用SEM/EDS和ICP-OES分析了涂层的化学成分。采用现场视频监控对HPMS行为进行了研究。所提出的调查结果是一个重要的贡献,为实施分类和标签系统,以支持和促进商业上可行的回收永磁体在工业规模。
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引用次数: 1
Contact Profile Analysis of Resource Estimation Domains: A Case Study on a Laterite Nickel Deposit 资源估算域的接触剖面分析——以某红土镍矿床为例
Pub Date : 2021-12-28 DOI: 10.3390/materproc2021005089
I. Kapageridis, A. Apostolikas, G. Kamaris
Resource estimation is commonly performed in separate domains that are defined using different criteria depending on the type and geometry of the deposit, the mining method used, and the estimation method applied. The validity of estimation domains can be critical to the quality of produced resource estimates as they control various steps of the estimation process, including sample and block selection. Estimation domains also affect statistical and geostatistical analyses because they define what estimation practitioners will consider as statistically separate distributions of data. Sometimes, samples from different estimation domains share similar grade properties close to the contact between domains, a situation known as a soft boundary. In such cases, it can be useful to include samples from different domains at short distances from the boundary. Contact profile analysis is a technique that allows for the measurement of the relationship between grades on either side of the contact between two estimation domains. As discussed in the study presented in this paper, contact profile analysis can help validate the defined estimation domains and control the application depth of any soft boundaries found between domains.
资源估计通常在不同的领域进行,这些领域根据矿床的类型和几何形状、使用的采矿方法和应用的估计方法,使用不同的标准来定义。估计域的有效性对产生的资源估计的质量至关重要,因为它们控制着估计过程的各个步骤,包括样本和块选择。估计域也影响统计和地理统计分析,因为它们定义了估计从业者将考虑的数据的统计分离分布。有时,来自不同估计域的样本在接近域之间的接触处具有相似的等级属性,这种情况称为软边界。在这种情况下,在距离边界很短的距离处包含来自不同域的样本可能是有用的。接触轮廓分析是一种技术,它允许测量两个估计域之间接触的任何一方的等级之间的关系。正如本文所讨论的那样,接触剖面分析可以帮助验证所定义的估计域,并控制域之间发现的任何软边界的应用深度。
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引用次数: 0
Sustainable Supply of Scandium for the EU Industries from Liquid Iron Chloride Based TiO2 Plants 以液态氯化铁为基础的二氧化钛工厂为欧盟工业可持续供应钪
Pub Date : 2021-12-25 DOI: 10.3390/materproc2021005086
Bengi Yagmurlu, B. Orberger, C. Dittrich, Georges Croisé, Robin Scharfenberg, E. Balomenos, D. Panias, Eleni Mikeli, Carolin Maier, Richard Schneider, B. Friedrich, Philipp Dräger, Frank Baumgärtner, Martin Schmitz, P. Letmathe, K. Sakkas, Christos Georgopoulos, Henk van den Laan
Scandium (Sc) applications in solid oxygen fuel cells, aeronautics and heat exchange systems are forecasted to increase significantly without a sufficient continuous Sc supply for Europe. ScaVanger is an EU project for upscaling Sc extraction and purification technologies from various TiO2 pigment production residues. High purity Sc2O3 and ScF3 will be produced at competitive prices for the EU market. The ScaVanger process is expected to result in a 10% higher production rate and higher product purity as processing starts with a unique cleaning process of actinides. The first plant at a major European TiO2 pigment production site will be supplying about 30 t/a of Sc2O3.
钪(Sc)在固体氧燃料电池、航空和热交换系统中的应用预计将显著增加,因为欧洲没有足够的连续钪供应。ScaVanger是一个欧盟项目,用于从各种TiO2颜料生产残留物中提升Sc提取和纯化技术。高纯度的Sc2O3和ScF3将以具有竞争力的价格在欧盟市场上生产。由于采用了独特的锕系元素清洗工艺,ScaVanger工艺预计将提高10%的生产率和更高的产品纯度。位于欧洲主要TiO2颜料生产基地的第一家工厂将提供约30吨/年的Sc2O3。
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引用次数: 4
Sustainable Silicon and High Purity Alumina Production from Secondary Silicon and Aluminium Raw Materials through the Innovative SisAl Technology 通过创新的剑麻技术,从二次硅和铝原料生产可持续硅和高纯度氧化铝
Pub Date : 2021-12-23 DOI: 10.3390/materproc2021005085
A. Toli, G. Tsaousi, E. Balomenos, D. Panias, M. Heuer, Harald Philipson, G. Tranell
Calcium aluminate slag produced by the aluminothermic reduction of silica is tested as a candidate raw material for the hydrometallurgical production of pure aluminium chloride hexahydrate (ACH) through leaching with hydrochloric acid. The crystallization of ACH follows by sparging the pregnant liquor with hydrochloric gas. Almost total extraction of Al is achieved with the use of azeotropic HCl acid solution (5.9 M) at 80 °C and 1 h retention time. A pregnant liquor with approximately 20 wt% AlCl3 is produced as a base for ACH crystallization by sparging it with gaseous HCl. The ACH produced is re-dissolved and crystallized three to four times until high purity is achieved. High purity ACH acts as a precursor for producing High Purity Alumina (HPA), a high added value material used in LEDs and lithium-ion batteries and other niche applications.
采用硅铝热还原法制备铝酸钙渣,作为湿法冶金生产纯六水氯化铝(ACH)的候选原料,进行了盐酸浸出试验。用盐酸气体喷淋孕液,使乙酰胆碱结晶。使用共沸盐酸溶液(5.9 M),在80°C和1 h的保留时间下,几乎可以完全提取铝。用气态的HCl将含有约20wt % AlCl3的怀孕液作为乙酰氨基乙烷结晶的碱。产生的乙酰胆碱再溶解和结晶三到四次,直到达到高纯度。高纯度乙酰胆碱是生产高纯度氧化铝(HPA)的前体,HPA是一种高附加值的材料,用于led和锂离子电池以及其他小众应用。
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引用次数: 4
Components’ Characterization of End-of-Life Dishwashers 报废洗碗机的部件特性
Pub Date : 2021-12-23 DOI: 10.3390/materproc2021005084
Eirini Evangelou, G. Anastassakis, S. Karamoutsos, A. Stergiou
The treatment of Wastes of Electrical and Electronic Equipment (WEEE) is a significant source of secondary raw materials. Ferrous and non-ferrous metals, electronic equipment, and plastics are among these materials. One of the most common metals sourced out of WEEE is stainless steel. Dishwashers are common sources of stainless steel, so large amounts of stainless steel can be recovered from them. In this project, dishwashers were submitted to size reduction via shredding, and the shredded products went through a magnetic separator (which separates all the magnetic ferrous components), an eddy current sensor (which separates all the non-ferrous components) and an induction sorting sensor (which removed all the metallic fractions). This procedure led to the following two streams: one with stainless steel, boards, and cables and another stream mainly including plastic. In the next stage, the stainless-steel stream passed through a high-intensity magnetic separator, leading to a magnetic and a non-magnetic stream. Thereafter, hand sorting was applied to both streams which aimed to increase the recovery from each stream.
电子电气设备废弃物的处理是二次原料的重要来源。黑色金属和有色金属、电子设备和塑料都属于这些材料。WEEE中最常见的金属之一是不锈钢。洗碗机是不锈钢的常见来源,因此可以从中回收大量的不锈钢。在这个项目中,洗碗机通过粉碎来缩小尺寸,粉碎后的产品经过磁选机(分离所有的磁性铁成分)、涡流传感器(分离所有的有色成分)和感应分选传感器(去除所有的金属成分)。这个过程导致了以下两种流:一种是不锈钢,板和电缆,另一种主要包括塑料。在下一阶段,不锈钢流通过高强度磁选机,形成磁性流和非磁性流。此后,手排序应用于两个流,目的是增加每个流的回收率。
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引用次数: 0
Mineral Raw Materials’ Resource Efficiency in Selected ESEE Countries: Strengths and Challenges ESEE国家矿产原料资源效率:优势与挑战
Pub Date : 2021-12-21 DOI: 10.3390/materproc2021005083
Stavroula Giannakopoulou, F. Chalkiopoulou, K. Adam
The mineral raw materials’ resource efficiency is currently recognized in Europe as the way for the future development of the European mining economies. With this aim, a West Balkan Mineral Register was created in the EIT Raw Materials RESEERVE Project, including Primary and Secondary Raw Materials of six Eastern and South-Eastern Europe (ESEE) countries, i.e., Albania, Bosnia and Herzegovina, Croatia, Montenegro, North Macedonia, and Serbia. Within the Project, a Strengths, Weaknesses, Opportunities, and Threats (SWOT) and Gap Analysis was also performed for the development of the raw material sector in the region. This paper summarizes the main strengths to be exploited, i.e., the significant geological potential, the presence of critical raw materials (e.g., Sb, Co, REEs) in primary and secondary raw materials, and the challenges to address, i.e., compliance of resources/reserves classification with international standards, integration of state’s mineral policy with spatial planning strategies, improvement of the business environment, capacity building of the raw materials workforce and enhancement of the public acceptance of the sector, in order to achieve the sustainable development of the mineral resources of the six ESEE countries. These opportunities comply with the objectives of the EU Raw Materials Initiative and are expected to contribute in the further enhancement of those economies in transition for the upcoming years.
矿物原料的资源效率目前在欧洲被公认为是未来欧洲矿业经济发展的道路。为此目的,在EIT原料储备项目中设立了西巴尔干矿物登记册,其中包括六个东欧和东南欧国家的初级和次级原料,即阿尔巴尼亚、波斯尼亚-黑塞哥维那、克罗地亚、黑山、北马其顿和塞尔维亚。在该项目中,还对该地区原材料行业的发展进行了优势、劣势、机会和威胁(SWOT)和差距分析。本文总结了可开发的主要优势,即巨大的地质潜力,主要原材料和次要原材料中存在关键原材料(如Sb, Co, ree),以及需要解决的挑战,即资源/储量分类与国际标准的一致性,国家矿产政策与空间规划战略的整合,改善商业环境,原材料劳动力的能力建设和提高该部门的公众接受度,以实现六个ESEE国家矿产资源的可持续发展。这些机会符合《欧盟原材料倡议》的目标,预计将有助于在今后几年进一步加强转型期经济。
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引用次数: 1
Sustainable Development Goals in Mine Tailings Management: Targets and Indicators 尾矿管理中的可持续发展目标:目标与指标
Pub Date : 2021-12-20 DOI: 10.3390/materproc2021005082
Natalia Araya, Oscar Mamani Quiñonez, L. Cisternas, A. Kraslawski
Minerals and metals are essential to the economic and social development of our society, and they are critical to modern life. The continuous exploitation of mineral resources has led to a large amount of waste, which has a large impact on the environment. One of the main streams of wastes in mining is mine tailings, which are produced in mineral processing plants. The mining industry must enhance its contribution to achieving sustainable development by incorporating the sustainable development goals into its operations. The objective of this article is to define targets and indicators for mine tailings management to achieve the sustainable development goals, defined in the 2030 Agenda for Sustainable Development by the United Nations. The result of this study is a collection of indicators proposed to measure the progress of mine tailings management towards sustainable development.
矿物和金属对我们社会的经济和社会发展至关重要,它们对现代生活至关重要。矿产资源的不断开采产生了大量的废弃物,对环境造成了很大的影响。尾矿是矿山废弃物的主要来源之一,是矿山选矿厂产生的尾矿。采矿业必须将可持续发展目标纳入其业务,从而加强其对实现可持续发展的贡献。本文的目的是确定尾矿管理的目标和指标,以实现联合国2030年可持续发展议程中确定的可持续发展目标。本研究的结果是提出的衡量矿山尾矿管理可持续发展进展的指标集合。
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引用次数: 8
Increasing Resource Efficiency of Bauxites Using LIBS 利用LIBS提高铝土矿资源效率
Pub Date : 2021-12-14 DOI: 10.3390/materproc2021005081
J. Meima, B. Orberger, Carlos García Piña, Antoine Prudhomme, C. Dittrich
The EU aluminium production from, e.g., bauxite is one of the backbones to support Europe’s green and digital transition. In support of sustainable bauxite exploration and mining, Laser Induced Breakdown Spectroscopy (LIBS) was used on the major facies of the karst bauxite deposits of SODICAPEI (Southern France). Our results showed that LIBS is a very promising technology to define the bottom and top layer of bauxite ores and to access critical parameters crucial for bauxite mining and processing. First LIBS tests were made on scandium standards to find appropriate Sc emission lines for future applications.
欧盟铝土矿等铝材生产是支持欧洲绿色和数字化转型的支柱之一。为了支持铝土矿的可持续勘探和开采,对法国南部SODICAPEI岩溶铝土矿床的主要相进行了激光诱导击穿光谱(LIBS)研究。我们的研究结果表明,LIBS是一种非常有前途的技术,可以定义铝土矿矿石的底层和顶层,并获得铝土矿开采和加工的关键参数。首先在钪标准上进行了LIBS测试,以找到适合未来应用的Sc发射线。
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引用次数: 1
Diabase Mud-Based Geopolymer Paste: Formulation and Properties 辉绿石泥基地聚合物浆料:配方与性能
Pub Date : 2021-12-13 DOI: 10.3390/materproc2021005077
M. Spanou, S. Luhar, P. Savva, S. Ioannou, M. Petrou, I. Luhar, D. Nicolaides
The concepts of sustainability and waste utilization have received urgent attention in the European construction industries. Material selection plays a vital role in the manufacturing process of sustainable building construction. The general objective of this study is the transformation of waste diabase mud into a value-added product. The diabase mud was characterized, and different parameters were selected for the cement, as well as the metakaolin in the mixture. This paper includes analytical research results of a geopolymer paste embedded with diabase mud waste material as its precursor, and a combination of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) as its alkaline activators to form a geopolymeric system. The compressive strength of the optimum mix sample was recorded as 14.0 MPa at 72 h. The embedding of a diabase mud into a geopolymer resulted in a viable composite for use in the construction industry.
可持续性和废物利用的概念在欧洲建筑工业中得到了迫切的关注。材料的选择在可持续建筑的制造过程中起着至关重要的作用。本研究的总体目标是将废辉绿石泥浆转化为增值产品。对辉绿岩泥进行了表征,选择了不同的水泥参数,以及混合物中的偏高岭土。本文介绍了以辉绿石泥废料为前驱体,以氢氧化钠(NaOH)和硅酸钠(Na2SiO3)为碱性活化剂包埋地聚合物浆料形成地聚合物体系的分析研究结果。在72小时内,最佳混合样品的抗压强度记录为14.0 MPa。将辉绿岩泥嵌入地聚合物中产生了可用于建筑行业的复合材料。
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引用次数: 1
A Roadmap for Exploration and Exploitation of Mineral Raw Materials in Greece 希腊矿产原料勘探和开采路线图
Pub Date : 2021-12-13 DOI: 10.3390/materproc2021005080
Diamantoula Lampou, C. Karathanasis, Ioannis G. Zafeiratos, P. Tzeferis
Despite EU climate objectives and raw material needs, there is a growing concern caused by the limited direct access to primary sources and supplies of valuable raw materials, and by the heavy reliance on imports. Member states are encouraged to design and implement effective policies to improve domestic access to raw materials and to promote green energy, thus advancing European competitiveness, particularly for high tech products, emerging innovations and quality of life. The Greek Ministry of Environment and Energy, Secretariat-General for Energy and Mineral Raw Materials (MRM), Directorate-General for MRM, as an important stakeholder in the management of the raw material value chain that focuses on developing and providing a transparent and stable regulatory framework for mining and quarrying exploration and exploitation, ensures its efficient implementation in line with the principle of sustainability and facilitates strategic investments in knowledge, technology and innovation, therefore enhancing development benefits to local communities and society more generally.
尽管欧盟有气候目标和原材料需求,但有价值的原材料的直接来源和供应有限,以及对进口的严重依赖,引起了越来越多的担忧。鼓励成员国设计和实施有效政策,改善国内原材料供应,推广绿色能源,从而提高欧洲竞争力,特别是在高科技产品、新兴创新和生活质量方面。希腊环境和能源部、能源和矿物原材料总秘书处(MRM)、MRM总干事,作为原材料价值链管理的重要利益相关者,致力于为采矿和采石勘探和开采制定和提供透明和稳定的监管框架,确保其根据可持续性原则有效实施,并促进知识方面的战略投资。因此,促进发展的技术和创新更广泛地造福于当地社区和社会。
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引用次数: 0
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