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Key Carbon Mineralization Definitions. Alkalinity: Alkalinity refers to the ability of water to resist acidification.Alkaline minerals include calcium, magnesium and others. Alkaline Feedstocks: Raw materials such as alkaline rocks, industrial by-products or mine tailings that have been crushed or turned into powder and are used to mineralize CO2. ...
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With the vigorous development of industrial economy, the production capacity and level have been significantly improved, but at the same time, a large amount of iron tailings, fly ash and a series of bulk solid waste materials have been accumulated. These industrial wastes have caused serious impact on the ecological environment. How to …
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The curing ages, the fly ash, the GGBS and 5% dolomite rock powder or 5% iron tailings powder demonstrated a positive effect on the chloride ion impermeability.
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Iron tailings powder can refine the pores in the composite binder hardened paste. Abstract. Cement–iron tailing powder composite cementitious materials (CT-C-CMs) is the research object of this study. Accordingly, hydration heat tests were implemented to analyze the hydration heat release law. To investigate the hydration kinetic course, the ...
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This paper reports the results of an initial attempt of using iron ore tailings (IOTs) to develop greener engineered cementitious composites (ECCs). ECC is a unique class of high-performance fiber-reinforced cementitious composites featuring high tensile ductility and durability.
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Iron tailings are collected from the mine, dried, dehydrated and ground into fine iron tailings powder (ITP). See Table 3 for specific performance indexes. The main chemical composition of iron tailings powder by XRF is SiO 2, including some metal elements such as iron, copper and zinc.See Table 4 for the main chemical composition.. …
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The history of the asbestos controversy over exposure to mineral particulates, including those suspected to be asbestos, released during the mining and milling of taconite iron ore is given by Berndt and Brice (2008) and Wilson et al. (2008). This asbestos controversy is particularly related to litigation involving the Reserve …
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The cementing material of fine full-tailings is developed with the fine tailings of Anshan Iron and Steel Company as aggregates, the water quenching slag of blast furnace as the main active material, and the desulphurized ash residue as one of the main activator materials. This paper explores the effects of composite activator with different ...
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1. Introduction. Asbestos tailings are hazardous solid wastes from the residue of asbestos mine, containing short asbestos fibers (length of the fiber <1.18 mm) and ore fragments, whose major mineral is serpentine.About 25–27 t asbestos tailings are produced with 1 t asbestos mined out.These residues piled up around the asbestos …
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The proportion of ITP is still about 70% of the total amount of iron tailings [3]. It is urgent to find method to achieve zero discharge. The main chemical compositions of iron tailings are SiO 2, Al 2 O 3, Fe 2 O 3, CaO and MgO [[4], [5], [6]]. The main mineral compositions of iron tailings are quartz. Iron tailings can be used in concrete ...
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They've placed tailings from exploratory drilling into assorted containers, and are measuring the reaction rates that result from using different chemical additives and processes under different...
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Abstract: We investigated the potential of tailings generated from chrysotile asbestos fiber production as a source of iron, nonferrous metals, and gold. We proposed the use of …
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Asbestos means the asbestiform varieties of serpentinite (chrysotile), riebeckite (crocidolite), cummingtonite-grunerite, anthophyllite, and actinolite-tremolite. Asbestos …
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In the last category, iron ore tailing powder and zeolite were combined at 5%, 10%, 15%, and 20% as replacements for both fine aggregate and cement, respectively, represented as IPZ (correspondent ...
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Solid waste management is a critical issue worldwide. Effectively utilizing these solid waste resources presents a viable solution. This study focuses on Iron ore tailings (IOTs), a solid waste generated during iron ore processing, which can be used as supplementary cementitious materials (SCMs) but have low reactivity, hindering their …
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The concrete with 10% glass powder & 30% iron ore tailings showed a higher strength compared to the conventional mix for 28 days. Concrete mix containing 10% GP and 30% IOT showed …
DetailsResearchers have devised new methods to turn toxic asbestos mine tailings into innocuous piles of carbonate rock and draw down atmospheric carbon dioxide at the same time.
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In this study, fine-grained iron tailings, graphite, and SiC powder were used as raw materials to explore a novel strategy for developing SiC porous ceramics from industrial waste. By optimizing the conditions of carbothermal reduction reaction between iron tailings and graphite, the formation and growth of SiC grains were enhanced.
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The cementitious activity of iron tailings powder (ITP) as a concrete admixture is investigated and optimized in this study. When the specific surface area (SSA) of ITP is in the range of 450 – 550 m 2 /kg, the activity is larger than that of fly ash, and when SSA is 469 m 2 /kg, the activity reaches its largest value of 76.82%. The content …
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Two kinds of composite mineral admixtures were prepared by grinding iron tailings powder and silicon powder in the ratios of 3∶2 and 4∶1, respectively to substitute cement for the preparation of mortar and concrete samples. The basic properties of iron tailings-silica fume composite mineral admixture mortar and concrete have been …
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Based on the chemical and mineral composition of asbestos tailings, the asbestos tailings powder was pre-fired, formed into green body and finally heat-treated to prepare glass-ceramics through the processes of crystallization and sintering. ... Decoration of serpentine with iron ore as an efficient low-cost magnetic adsorbent for Cr (VI ...
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Optimal iron tailings powder and iron tailings sand contents in UHPC mixtures were obtained. Abstract. Iron tailings (IT) is a kind of solid waste, which is usually divided into iron tailings powder (ITP) and iron tailings sand (ITS). It has been reported that IT has potentials to be used in ultra high performance concrete (UHPC). However, …
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Based on the attribute of asbestos tailings rich in silicon and magnesium, the powder of asbestos tailings was pre-calcined followed by MgO addition in the green body and finally sintered to ...
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ed glass-ceramics without using ing agents are fabricated by powder sintering, using asbestos tailings and waste glass as raw materials. Waste glass content and …
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（2）Iron tailings powder: iron tailings are taken from a tailings reservoir in Hebei Province, China, its main chemical components are shown in Table 3, and the phase analysis is presented in Fig. 1.The planetary ball mill (XQM-4) was used to grind the iron tailings, the mill speed was set to 360 r/min, the grading of the grinding ball was …
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1. Introduction. Iron tailings are a type of solid waste produced during the separation of valuable metals from iron ores [1].Iron tailings are the primary mine solid waste in China, with reserves of nearly 5 × 10 3 million tons and a steady annual growth rate of over 30 million tons [2].Generally, iron tailings are deposited in tailing dams, …
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The aim of this study was to investigate the effect of cement and fly ash compound admixtures on the mechanical properties of iron tailings powder (ITP). Hence, different …
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to the working performance of concrete and can effectively reduce the time-loss of. concrete fluidity. When the content of iron tailings powder in the composite admixture. is 50%, the 1080d long ...
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TANG Z, GAO P, LI Y, et al. Recovery of iron from hazardous tailings using fluidized roasting coupling technology[J]. Powder Technology, 2020, 361:591-599. Google Scholar [20] SUN Y, ZHANG X, HAN Y, et al. A new approach for recovering iron from iron ore tailings using suspension magnetization roasting:A pilot-scale study[J]. Powder …
DetailsThe tailings were crushed and then passed through a 60-mesh sieve. Composition of the iron tailings is shown in Table 1. The tailings contain 61.03 wt% SiO 2, which is a high silica iron tailing. Graphite powder, which used for carbothermal reduction with iron tailings, is obtained by crushing the processing debris of graphite products.
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DOI: 10.1016/j.jobe.2024.108442 Corpus ID: 266822226; Properties of Ultra-High Performance Concrete incorporating iron tailings powder and iron tailings sand @article{Shi2024PropertiesOU, title={Properties of Ultra-High Performance Concrete incorporating iron tailings powder and iron tailings sand}, author={Jun Shi and Wuzhi …
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It can provide a way for comprehensive utilization of the asbestos tailing in asphalt mixtures. Zhang et al. [10] conducted the study on the mechanical properties of cement emulsified asphalt mortars incorporated with iron tailings as the aggregates. The results indicated that the compressive strength of the specimens increased with the ...
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DOI: 10.1016/J.JNONCRYSOL.2018.10.029 Corpus ID: 164844643; Thermal process and mechanism of phase transition and detoxification of glass-ceramics from asbestos tailings @article{Wenmiao2019ThermalPA, title={Thermal process and mechanism of phase transition and detoxification of glass-ceramics from asbestos tailings}, author={Zheng …
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Asbestos is the generic commercial designation for a group of naturally occurring mineral silicate fibres of the serpentine and amphibole series.
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The microstructures and element contents of iron tailings powder, cement, and nano-clay are determined by SEM and EDS according to the testing methods in [22]. Fig. 2 a is the SEM spectrum of iron tailings powder, showing the random and disorder configuration of iron tailing particles and many pores with different radii (>1 μm) …
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Asbestos tailings are another solid waste produced during the mining and beneficiation of chrysotile. In China, about 20 to 30 tons of asbestos tailings are produced for each ton of chrysotile asbestos (Zheng et al., 2019). ... using industrial waste fine-grained iron tailings and graphite powder as raw materials. Then paraffin/SiC shape …
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