Definition. Powder X-ray Diffraction (XRD) is one of the primary techniques used by mineralogists and solid state chemists to examine the physico-chemical make-up of unknown solids. This data is represented in a collection of single-phase X-ray powder diffraction patterns for the three most intense D values in the form of tables of interplanar …
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— Mine tailings are often considered problematic materials because of their loose depositional fabric and susceptibility to static and cyclic liquefaction failures. Yet, they are often stored behind tailings' dams in a highly saturated state, posing significant environmental, social, and economical hazards. This study examines the application of a …
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— Historically, safe containment has been the main goal of tailings management. Disposal has taken place in sizable surface impoundments that are enclosed by dams or embankments, as well as in subterranean workings and unnatural depressions [10], [11].However, the environment and communities are seriously endangered by the …
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— Abstract. Considering C O 2 emissions during production and re-mineralization during hardening, natural hydraulic lime (NHL) has been deemed an ideal …
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— Immense quantities of tailings accumulate in the form of large hills or water ponds, which may cause severe problems. Sometimes, large tailing dumps are unstable, suffer from slope instability, and may cause geo-hazards such as landslides (Hearn, 1995; Yang et al., 2015).Furthermore, as reservoirs of metal-containing wastes, copper mine …
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What is Calcite? Calcite is a rock-forming mineral with a chemical formula of CaCO 3.It is extremely common and found throughout the world in sedimentary, metamorphic, and igneous rocks. Some geologists consider it to be a "ubiquitous mineral" - …
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— Tailing sand contains a large number of heavy metals and sulfides that are prone to forming acid mine drainage (AMD), which pollutes the surrounding surface environment and groundwater resources and damages the ecological environment. ... The XRF results of the pyrite tailings are shown in Table 1. The pH of the pyrite tailings sand …
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— High-grade magnesite, dolomite and calcite ores were broken, ground and sieved, then the size ranging from 37 to 74 μm were selected for micro-flotation experiment, and the size of −74 μm was further ground to −2 μm for zeta potential measurement and FTIR analysis. The elemental analysis of the three samples were presented in Table 1 ...
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— Yet, they are often stored behind tailings' dams in a highly saturated state, posing significant environmental, social, and economical hazards. This study examines …
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This study examines a sustainable technique known as Microbially-Induced Calcite Precipitation (MICP) to improve the static liquefaction resistance of gold mine silty sand tailings. ... Table 1 summarizes the DSS tests carried out in this study. ... (to about ε vol < 2%) as a result of the stiffer (cemented) tailing's structure. Download ...
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Windblown dust emissions from tailing deposits can cause severe damage to local ecosystems and adverse health effects for the surrounding population. Microbially induced calcite precipitation
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— Due to erosion, the tailings contain a large amount of quartz, feldspar, amphibole, pyroxene, calcite, dolomite, silicate minerals, and magnesium. The main chemical components are silicon, aluminum, calcium, and magnesium. etc., in which the content of silicon and aluminum is higher. Therefore, it is essential to fully use tailings …
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— The investigated mixtures are reported in Table 1. After selecting the optimal powder blend, the process was investigated by varying the total amount of material added in the mixer, the amount of water added to the mixture and the speed of the rotor and pan during step (3) of mixing. ... The tailings - composed mainly of calcite and quartz ...
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— For comparison purposes, the table also shows the contact angle of water glass-treated scheelite and calcite, further conditioned with mixed collectors at pH 9,in this latter case the contact angle of scheelite is 73.5°. however, the the contact angle of calcite decreased to 30.4°, which indicates that calcite has a relatively lower ...
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— 1.1. What Are Mine Tailings? An Initial Scope in an Uncertainty and Complex World. The initial step in mineral processing involves crushing and grinding ore to produce a suitable particle size for further metallurgical processing using physical and chemical separation methods [].Physical separation processes take advantage of the …
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— The tungsten minerals were scheelite and wolframite and were associated with garnet, fluorite, and calcite. ... while the utilisation of tailing water was greatly limited. Lastly, in the subsequent flotation process, the depressed fluorite was difficult to recover. ... Tables 1 and 2 summarise the contents of the ore and phases of tungsten ...
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— The percentage of recovery is very low for these extenders, i.e. 30% for china clay and 70% for calcite [21]. 2. Materials and methods2.1. Characterization of copper tailing waste (as received)Copper tailing waste was collected from Khetri, Rajasthan, India. It was characterized for elemental composition, mineral phases, content of heavy metals ...
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— Four tailings cores were drilled in the tailings dam slope (55, 70, 80, and 98 m long) to identify the chemical weathering profile of the (ultra-)mafic mine tailings (Table …
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— Table 13.2 displays some recent geopolymer applications used mine tailings [37]. ... calcite decomposes over 800°C while silicates require temperatures over 1100°C to alter ... Submarine and deep-sea mine tailing placements: a review of current practices, environmental issues, natural analogs and knowledge gaps in Norway and internationally ...
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— 2.1 Materials, reagents and equipment. The scheelite raw ore used in this study was obtained from Malipo mine, Yunnan Province. The assay results are listed in Tables 1 and 2.As indicated by Table 1, the primary valuable of tungsten mineral was scheelite, and the main gangue minerals were silicate, Ca-containing minerals (calcite, …
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— Particles with diameter between +0.038 mm to −0.074 mm were obtained after wet sieve. Both bastnaesite and calcite samples were dried over at 40 °C vacuum oven. The chemical composition and X-ray diffraction pattern (XRD) measurements of bastnaesite and calcite are shown in Table 1 and Fig. 1. The results indicated that the …
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Volume 270, 15 September 2020, 110881. Review. A review on different methods of activating tailings to improve their cementitious property as cemented paste and …
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— A large number of tailings and industrial waste residues produced by mineral resources mining are stored in tailings pond except for a small part of construction materials 1,2,3,4,5,6.Therefore ...
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— Instead, the analysis showed a major presence of quartz, mica minerals, albite and calcite. Mine tailing sample Tian is from dolomitic limestone ore, the main minerals are phosphate mineral laueite, dolomite and calcite in addition to quartz and chlorite. ... (Table 3). Even though mine tailing samples of Kill A and Nus possessed low …
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— The FTIR spectra of calcite before and after the treatment of different reagent schemes are presented in Fig. 8 C. For bare calcite, the bands at 875.52 cm −1 and 711.60 cm −1 are attributed to the deformation vibration of C O in calcite and the bands at 1425.14 cm −1 correspond to the stretching vibration of C O in calcite.
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— Microbial induced calcite precipitation (MICP) is probably the most studied biogeochemical process. It promotes calcite precipitation, as a result of biological activity of different microorganisms. Available research indicates that MICP is a tool that has the potential to contribute to a more sustainable management of tailing deposits.
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— A series of characteristics of the two tailing samples are listed in Table 1. From the table it can be seen that the main differences in composition are calcite content (higher in MT 2), free chalcopyrite content (higher in MT 2), and magnetite content (higher in MT 20). The last is an indication of the ongoing oxidation of the tailings.
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— Tailing sand contains a large number of heavy metals and sulfides that are prone to forming acid mine drainage (AMD), which pollutes the surrounding surface environment and groundwater resources and …
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This study examined the effects of Microbial-Induced Calcite Precipitation (MICP) on the shearing strength, pore pressure generation, and static liquefaction behavior of silty …
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— In this study, the physical and geochemical stabilization of coal tailings using microbially induced calcite precipitation (MICP) was evaluated at a laboratory pilot scale.
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— Microbially induced calcite precipitation could be applied during the operation of mining tailings depostis, with different potential objectives: removal or immobilization …
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— Also, the types of mines and their toxicity are listed in Table 1. Table 1. Types of mines, toxicity caused by processing tailings, and tailings reusability. Types of mines Tailing compounds Toxins from processing tailings ... Quartz, Kaolinite, Chlorite, Calcite, Feldspars, Dolomite: Iron sulfide, methane, carbon monoxide, sulfur dioxide and ...
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