Biocementation of Pyrite Tailings Using Microbially Induced Calcite …
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 …
Transformation of mine tailings into cement-bound …
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 ...
Flotation separation of fluorite from calcite using bis …
According to Table 2, when Naol was used as collector, the recovery of F in the concentrate reached near 95 %, however, F was barely enriched with F grade slightly increased from 23.50 % to 24.02 %, suggesting that fluorite and calcite cannot be effectively separated by using NaOl as collector. In contrast, in flotation concentrate, the …
Chemical weathering profile in the V–Ti–Fe mine tailings
Additionally, about 0.17 vol.% of calcite is present in the tailings waste (Table 2). The dissolution of calcite is directly attributed to H + activity (Busenberg and …
Properties of an aged geopolymer synthesized from calcined ore-dressing
Its chemical composition is listed in Table 1 and the mineral composition is shown in Fig. 1. Note that mullite in the original and calcined tailing results from the addition of fly ash into the mud of the tailing for easier filtering. ... Compared to the mineral composition of the calcined tailing, two new crystalline phases, calcite and ...
Unlocking the potential of microbes: biocementation
Biocementation has emerged as an effective technique for controlling liquefaction by reducing soil or tailing substrate permeability through calcite precipitation (Ferris et al. 1996). Biocemented soils exhibit improved resistance to liquefaction due to disrupted flow paths, reduced permeability, and decreased pore water pressure …
Potential Use of Microbially Induced Calcite Precipitation for …
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Calcite
Calcite is a carbonate mineral, currently used as a decorative block. Calcite drops as an item if mined by any pickaxe. If mined without a pickaxe, it drops nothing. Calcite generates naturally as part of the structure of amethyst geodes, between the smooth basalt and block of amethyst layers. It also generates in the stony peaks in strips. Calcite is currently …
Full article: Mineralogical characterization related to physico
Except for GS1, GS2, GS3 and GS4, which did not contain a water table, all samples contained fine tailing particles near the water table (250 ± 50 cm), which are confirmed calcite (CaCO 3), leading to acid neutralization. However, GS6 and GS10 have profiles containing coarse particles near the water table and did not contain calcite (Fig. …
Improving the sustainable management of mining tailings …
Table 1 presents a summary of available research addressing heavy metal removal through MICP. Table 1. ... Due to the porosity and chemical properties of …
Effect of microbial-induced calcite precipitation on shear …
Table 2 summarizes the direct shear tests of this study. Consolidation void ratios ... The immediate precipitation and the binding of calcite to the tailings' particles …
Inorganic Precipitation of Calcite in Mine Tailings Using Trona
The major benefit of using trona to precipitate calcite is its relatively high solubility in water, i.e. 200 g/L at 25 °C (Ozdemir et al. 2010 ), compared to other inorganic compounds …
Effect of calcium ion on the separation of rhodochrosite and calcite
In order to investigate whether SH is suitable for separating calcite from rhodochrosite, the samples of rhodochrosite and calcite were mixed by mass ratio of 1:1 and floated at pH 11 using NaOL and SH as collector and depressant, respectively, and the result is presented in Table 1.In the mixed sample, the theory grades of Mn and Ca are …
Phosphate sorption by calcite, and iron-rich calcareous soils
The sorption maximum of calcite was 26 mg P kg −1. This result was used to calculate the surface coverage of calcite by sorbed P. The model indicated that only 1 4 to 1 8 of the unit cell surface was able to adsorb phosphate. High-gradient magnetic separation (HGMS) was used to fractionate soil clays into magnetic and tailing fractions.
Accelerated Carbonation of High-Calcite Wollastonite …
Despite consisting largely of non-reactive silicates and primary calcite, very fine tailings showed promise in closed-chamber batch-type aqueous carbonation, achieving a conversion extent of over 28% in one hour at 100 bar and 60 °C. ... (see Table 2). As …
The 12 Different Types Of Calcite (With Photos)
Honey calcite has a smooth texture and can be polished to a high shine. This polishing brings out its sunny color and makes it even more striking to look at, especially when the light catches it just right. Where you can find honey calcite. Honey calcite is located mainly in Mexico, where it is found in various mineral-rich regions. …
Effects of microbially induced calcite precipitation on static
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: Download high-res image (230KB) Download ... The quantity of precipitated calcite is noted to be greater in denser specimens due to the increased number of particle contacts which acts as ...
Biocementation of Pyrite Tailings Using Microbially Induced Calcite …
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. Microbially induced calcium carbonate precipitation (MICP) technology can biocement …
(PDF) Preliminary mineralogical study of the flotation sand …
of the tailing pound, as determined by X-ray powder diffraction. The minor elements identified by atomic absorption spectrometry in the deposit are: tin, nickel, cobalt, germanium, gallium,
Socio-Environmental Risks Linked with Mine Tailings …
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 …
(PDF) Perkuatan Parameter Kuat Geser Tailing dengan
Perkuatan Parameter Kuat Geser Tailing dengan Metode Soybean Crude Urease Calcite Precipitation (SCU-CP) December 2023 Conference: The 4th Civil Engineering, Environment, Disaster, and Risk ...
Calcite Mineral | Uses and Properties
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" - …
Effect of microbial-induced calcite precipitation on shear …
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 …
The mechanics of a silt-sized gold tailing
A series of oedometer and triaxial tests was conducted on the gold tailing (summarized in Table 2, Table 3) using front loading oedometer frames.The diameters of the rings used were 50 mm and 30 mm, the latter having a floating ring design in order to reduce wall friction (Rocchi and Coop, 2015; Okewale and Coop, 2017), giving resultant …
Potential Use of Microbially Induced Calcite …
Mining activities offer clear economic benefits for mineral-rich countries. However, mining operations can produce several environmental impacts. Many of these are associated with generating and managing …
Micro-structure and morphology of tailings sand under …
Table 2 Mineral composition of tailings sand samples under different oxidation degrees (mass%). ... It can be inferred that the cements between particles are …
Effect of depressants on flotation separation of magnesite …
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 ...
Tabs | Calcite Design System
Key Function; Arrow right: When focused on a calcite-tab-title, moves focus to the next calcite-tab-title.If the current focus is on first calcite-tab-title, the focus will cycle to the last calcite-tab-title.: Arrow left: When focused on a calcite-tab-title, moves focus to the previous calcite-tab-title.If the current focus is on last calcite-tab-title, the focus will …
The flotation separation of fluorite from calcite using …
The floatability of fluorite and calcite as a function of NaOl dosage at pH 8.0 is shown in Fig. 4.As seen in Fig. 4, flotation recoveries of fluorite and calcite significantly increased with increasing dosage of NaOl and remained constant at high collector concentration.The flotation recovery of both fluorite and calcite was over 90 % using 1.5 …
14.7.1: Calcite Group Minerals
Calcite CaCO 3. Origin of Name From the Latin word calx, meaning "burnt lime.". Figure 14.361: Calcite cleavage fragments Figure 14.362: Calcite cleavage fragments. Hand Specimen Identification Calcite is identified by its hardness of 3, rhombohedral cleavage, and effervescence in cold dilute HCl. It may be confused with …