Semantic Scholar extracted view of "Preparation of UHPC with cement replaced by richsilicon iron ore tailing powder" by Lini Yang. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 215,130,968 papers from all fields of science. Search ...
High‑silicon iron ore tailings (IOTs) as mineral solid wastes derived from the processing and utilization of iron ore, which would threaten human health and the ecological environment if handled improperly. Coincidently, it consists of abundant quartz gangue. In this study, we proposed a superconducting high gradient magnetic separation (SHGMS) coupling with acid leaching technology to ...
The limited cementitious activity of steel slag (SS) powder restricts its largescale utilization as a replacement material for Portland cement and even more so for inert iron ore tailings (IOT). The microIOT (MIOT) were utilized as additives to improve the compressive strength and hydration degree of a binary system containing SS and PC.
DOI: / Corpus ID: ; Properties of highvolume iron tailing powder concrete under different curing conditions article{Han2020PropertiesOH, title={Properties of highvolume iron tailing powder concrete under different curing conditions}, author={Fanghui Han and Ao Luo and Juanhong Liu and Zengqi Zhang}, journal={Construction and Building Materials}, year ...
Iron ore tailings can be classified as high silicon, high aluminum, high calcium and magnesium, low silica and polymetallic type. And the highsilica iron ore tailings are widely distributed in China with large reserves. ... Earlyage hydration characteristics of composite binder containing iron tailing powder. Powder Technol. (2017) J. Liu et ...
In this study, iron ore tailings (IOTs) are used as aggregates to prepare ironoretailingengineered cementitious composites (IOTECCs) to achieve clean production. Some mechanical indexes, such as compressive strength (fcu), fourpoint flexural strength (ff), axial compressive strength (fc), deformation properties, flexural toughness, and stressstrain behavior, are studied.
The article conducts a study on the iron tailings sand concrete's fracture behaviour based on the doubleK criterion. Five sets of standard threepoint bending beam specimens of concrete with 0% ...
Iron ore tailings (IOTs) are the indusus solid waste discharged by concentrating mills after processing iron ores and selecting "valuable components" ( Yao et al., 2020 ). In China, 600 million tons of IOTs are discharged every year and the IOTs deposition has reached 5 billion tons.
To investigate the application of iron tailings in cementbased materials as fine aggregate and mineral admixture, six iron tailings sands were selected from different places of origin, and the methods of acid and alkali activation were adopted to increase the activity of tailings powder. The strength of mortar was evaluated and the composition and microstructure were analyzed to explore the ...
Abstract India is well enriched with abundant resources of magnetite and hematite iron ore. Mining activities are tremendously increasing to cater the demand of market, which in turn is responsible for huge generation of mining waste.
Iron ore tailings (IOTs) are a form of solid waste produced during the beneficiation process of iron ore concentrate. In this paper, iron recovery from IOTs was studied at different points during a process involving preconcentration followed by direct reduction and magnetic separation.
composite sintered bricks produced from shale, sewage sludge, coal gangue powder and iron ore tailings. Construction and Building Materials, 232(1 3), 117250. DOI / ...
Iron ore tailings (IOTs) are byproducts of the iron mining industry that have gained significant attention in recent years due to their potential for comprehensive utilization. ... Aluminum powder is the most commonly used ing agent in the production of AAC, and lime hydration provides the necessary alkaline environment for the ing ...
Iron ore tailings have been widely studied in recent years for blending in cementitious materials, ... Experimental investigations on the mechanical behavior of iron tailings powder with compound admixture of cement and nanoclay. Construct Build Mater, 254 (2020), /
The cementstabilized iron ore tailings may be incorporated in road constructions as they easily fulfill strength requirements of base and subbase course layers, while the bentonitetreated tailings are applicable as cover materials in layered disposal of tailings. Introduction
Materials. Portland cement (P·O ), silica fume (SF), and iron tailing powder (ITP) was used in this study, as presented in Figure 1 ac. The physical properties of the cement (Table 1) were conforming to the Chinese National Standards GB [].The SF had moisture of %, a density of g/cm 3, and loss on ignition of %.The ITP was obtained from iron tailings after ...
chemical mineral composition of iron tailings, the comprehensive utilization status of iron tailings is analyzed. Some existing problems are put forward and relevant Suggestions are given. 1. Introduction Iron tailings are the waste residue discharged from iron ore after they are selected by the ore dressing process.
(ii) iron tailings sand, used as fine aggregate, particle size ranging from mm to mm, is produced by grinding and filtrating of iron mineral [29] (iii) iron tailing powder as concrete mineral admixture, of particle size < mm. With the development of iron ore beneficiation, the size of IOT particle is getting smaller and smaller.
Materials. The ironore tailings used in the test were obtained from the Lizhu irontailing plant in Shaoxing, China, as shown in Figure liquid limit and plasticity index of the ironore tailing were % and, respectively, and the main compounds are shown in Table cement used in the test was produced by Shaoxing Zhaoshan Building Materials Co., Ltd. in ...
During the reduction roasting stage, the hematite within iron ore powder was almost entirely transformed into magnetite at a reduction temperature of 520 °C using a gas combination of 45 % H 2 15 % CO 40 % N 2, which significantly enhanced the magnetism of the particles. At this time, iron minerals could be effectively recovered by a ...
Peng et al. [20] reported that the mechanical and physical properties of cement blended with 20% tailings were comparable to pure cement. Yao et al. [21] demonstrated that the iron ore tailings structurally degraded with the extension of grinding time and the activated iron ore tailings exhibited cementitious properties in the alkaline environment.
Onitiri and Akinlabi 4 used 20% by volume of iron ore tailings as maximum amount in the investigated composites. ... A. Mechanical properties of iron powder filled high density polyethylene ...
The iron ore tailings aggregates concrete exhibited a good mechanical strength and even in the case of compressive strength, there was an improvement of % over conventional aggregates concrete. The indirect tensile strength did not improve against the control mix due high content of fines in the tailings aggregates but showed % ...
The influences of iron tailing powder (ITP) ... However, to recycle more iron from ore and tailings, the ultrafine grinding used in the beneficiation process today induces the particle size of iron tailings to finer and finer [25], which implies a potential for filler replacement in asphalt mixtures. Only a few researchers have explored this field.
The newly developed versions of ECC in this paper, with a cement content of, exhibit a tensile ductility of %, tensile strength of, and compressive strength of 4657MPa at ...
The results showed that the proper addition of iron tailing powder is beneficial to the working performance of concrete and can effectively reduce the timeloss of concrete fluidity. When the content of iron tailings powder in the composite admixture is 50%, the 1080d long age strength of C30 and C50 concrete can reach and MPa.
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 %. The content of ITP should not exceed 30%.
Natural or modified iron ore tailings in a CH 4 reducing atmosphere at 600 °C or impregnated with residues of polyethylene terephthalate (PET) powder (from bottle recycling) and treated under an inert atmosphere of N 2 at 600 °C were used as heterogeneous catalysts for the Fenton reaction.
Small iron tailing powder particles are beneficial to the properties of precast concrete, but large iron tailing powder particles weakly bond with surrounding hydrates. ... Innovative methodology for comprehensive utilization of iron ore tailings part 2: the residues after iron recovery from iron ore tailings to prepare cementitious material. J ...
In order to study the feasibility and sand substitution mechanism of cement mortar mixed with iron ore tailings (IOT), iron ore tailings cement mortars (referred to as IOTC) with IOT content of 0%, 25%, and 50% were made and tested. First, the basic properties of IOT used were measured to verify the theoretical feasibility. Second, the uniaxial compressive and tensile strengths, as well as the ...
Powder Technology Volume 361, 1 February 2020, Pages 571580 A new approach for recovering iron from iron ore tailings using suspension magnetization roasting: A pilotscale study Yongsheng Sun a b, Xiaolong Zhang a b c, Yuexin Han a b, Yanjun Li a b Add to Mendeley https://// Get rights and content •
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