Adsorption of Bacillus subtilis to minerals: effect on the flotation of dolomite and apatite

Zheng, X. P.; Arps, Peggy J.; Smith, Ross

doi:10.1016/s1572-4409(99)80012-1

Cited by 11 publications

(16 citation statements)

References 6 publications

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“…In carbonate bio-flotation, high negative charges are generated on the bacteria surfaces over a wider pH range when they are introduced in pulp containing Mg 2+ and Ca 2+ ions [3,23,33] (Table 2); suggesting high adsorption of the bacteria on the dolomite [33]. Even though both these ions are adsorbed by the bacteria, Mg 2+ is adsorbed to a greater extent than Ca 2+ [33].…”

Section: Electrical Chargementioning

confidence: 99%

“…Increasing the chain length of cationic collectors enhances dolomite recovery considerably, but selectivity is relatively decreased with increasing collector concentrations in the pulp [34,36,52]. Octadecylamine-kerosene Emulsion (1:3)~15 [36] Dodecyl-N-carboxyethyl-N-hydroxyethyl-imidazoline~98 [37] In general, cationic flotation is more sensitive toward desliming the flotation feed, while the anionic route is more sensitive toward the ionic composition of the pulp [2,3,7,17,[32][33][34]. Therefore, to achieve selective separation, it is crucial to develop selective collectors [51,54,55].…”

Section: Collectorsmentioning

confidence: 99%

“…Bacteria adhere to mineral surfaces with strains, modifying mineral surfaces, and aiding in the selective recovery of valuable minerals in flotation or flocculation processes [3,33,58]. Microorganisms boost the selectivity of conventional flotation processes where they are interchanged with chemical reagents to separate minerals with similar surface properties [11].…”

Section: Bio Depressionmentioning

confidence: 99%

“…Dolomite (CaMg(CO 3 ) 2 ) and magnesite (MgCO 3 ) are the main Mg carbonates [3][4][5][6][7][8] that can be associated with other salt-type minerals, including phosphates (e.g., Apatite), sulfates (e.g., Barite), halides (e.g., Fluorite) and tungstates (e.g., Scheelite) [5,9], as well as sulfides [10], and other oxides [2].…”

Section: Introductionmentioning

confidence: 99%

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A Review of Flotation Separation of Mg Carbonates (Dolomite and Magnesite)

et al. 2018

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Abstract:It is well documented that flotation has high economic viability for the beneficiation of valuable minerals when their main ore bodies contain magnesium (Mg) carbonates such as dolomite and magnesite. Flotation separation of Mg carbonates from their associated valuable minerals (AVMs) presents several challenges, and Mg carbonates have high levels of adverse effects on separation efficiency. These complexities can be attributed to various reasons: Mg carbonates are naturally hydrophilic, soluble, and exhibit similar surface characteristics as their AVMs. This study presents a compilation of various parameters, including zeta potential, pH, particle size, reagents (collectors, depressant, and modifiers), and bio-flotation, which were examined in several investigations into separating Mg carbonates from their AVMs by froth flotation.

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Section: Electrical Chargementioning

confidence: 99%

Section: Collectorsmentioning

confidence: 99%

Section: Bio Depressionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Review of Flotation Separation of Mg Carbonates (Dolomite and Magnesite)

et al. 2018

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“…The experiments investigating the binding of Ca(II) and Mg(II) to B. subtilis cells were initiated, and anionic collector microflotation of pure dolomite and apatite mineral samples in the presence and absence of these bacteria was performed. Since Ca(II) and Mg(II) also bind to dolomite and apatite, the zeta-potential measurements as a function of pH in the presence and absence of these ions were performed in order to better elucidate the effect this binding may have on the attachment of B. subtilis to those two minerals [58].…”

Section: Mechanical Flotation Cells Column Flotationmentioning

confidence: 99%

Mining and Beneficiation of Phosphate Ore

Ptáček¹

2016

Apatites and Their Synthetic Analogues - Synthesis, Structure, Properties and Applications

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The first commercial production of phosphate rock began in England in 1847. A wide variety of techniques and equipment is used to mine and process phosphate rocks in order to beneficiate low-grade ores and remove impurities. The eighth chapter of this book deals with mining and beneficiation of phosphate ore. The principle and operating conditions of important parts of manufacturing process including separation, classification, removing of carbonates, calcination and flotation was described. The chapter ends with description of techniques used for extraction of rare earth element. phosphates are very similar. The separation by physical means becomes even impossible when the carbonate minerals are finely disseminated into the phosphate particles. KeywordsAn alternative technique for the beneficiation of these ores is the calcination. Calcination is the process of heating the ore to a high temperature ranging from 800 to 1000°C to decompose CaCO 3 and MgCO 3 to CaO, MgO and gaseous CO 2 . The CaO and MgO formed are then removed as hydroxides by quenching the calcined product in water and washing. The most common chemical reagent used to enhance the removal of calcium and magnesium hydroxides is ammonium chloride.Chemical dissolution of carbonate minerals (calcite and dolomite) from calcareous phosphate ores, without the calcination, using organic acids also proved to be capable of beneficiating the calcareous phosphate ores on the laboratory scale.4. Phosphate ores associated with organic matter (black or brown phosphates): ores of this type are generally beneficiated by heating the ore up to about 800°C. This type of calcination burns organic material and residual organic carbon without significantly affecting the superior qualities of sedimentary phosphates such as the solubility and reactivity.Furthermore, as a result of low calcination temperature, the reduction of calcium sulfate, present in ore, to corrosive calcium sulfide by the organic matter is minimized. During the burning of organic matter, the following two conditions must be kept: organic carbon must be decreased to less than 0.3% to minimize the gassing in the wet phosphoric acid processing, and apatite CO 2 must be maintained at a level close to 2% to allow good reactivity of calcined product.5. Phosphate ores containing more than one type of gangue minerals: many sedimentary phosphate deposits contain mixtures of undesired constituents. These ores require a series of beneficiating operations during their processing depending on the type of gangue minerals present in each ore. This may include, after the size reduction, the combination of attrition scrubbing, desliming, flotation, gravity separation and/or calcination. Each flow sheet is to be designed after thorough characterization and testing of a representative sample of the exploited ore.Igneous and metamorphic phosphate ores: the main gangue materials in these ores are sulfides, magnetite, carbonates (calcite, dolomite, siderite and ankerite), nepheline syenite, pyroxenite, foskorite,...

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Effects of magnetized ionized water and Bacillus subtilis on water and salt transport characteristics and ion composition in saline soil

Jiang,

Wang,

Ning

et al. 2024

Irrigation and Drainage

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Magnetized ionized water and Bacillus subtilis are essential for enhancing soil salinity leaching and improving soil structure. To explore the combined effects of magnetized ionized water and B. subtilis on water–salt transport in saline soil, a one‐dimensional vertical infiltration experiment was conducted. This study evaluated the soil water and salt distributions, infiltration model parameters and composition of exchangeable base ions with magnetized ionized water (M) and nonmagnetized‐ionized water, alongside varying amounts of B. subtilis [B0 (0%), B1 (1.5%), B2 (3.0%), B3 (4.5%), B4 (6.0%)]. The results showed that magnetized ionized water increased the infiltration volume and wetting front depth. As the application amount of B. subtilis increased, the changes in these two indicators initially increased but then decreased. The sorptivity parameter (S) mirrored this trend, whereas the shape coefficient (α) showed the opposite pattern. Compared with the B0 treatment, the MB1 treatment increased the 0–20 cm soil water content by 14%, decreased the salt content by 13% and improved the desalination rate by 98%, with the efficiency increasing by 62%. Moreover, the total exchangeable base ions increased, with the highest (Ca2++ Mg2+) and lowest Na+ contents observed under B1. MB1 notably enhanced infiltration and water–salt transport, demonstrating significant desalination effects.

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Adsorption of Bacillus subtilis to minerals: effect on the flotation of dolomite and apatite

Cited by 11 publications

References 6 publications

A Review of Flotation Separation of Mg Carbonates (Dolomite and Magnesite)

A Review of Flotation Separation of Mg Carbonates (Dolomite and Magnesite)

Mining and Beneficiation of Phosphate Ore

Effects of magnetized ionized water and Bacillus subtilis on water and salt transport characteristics and ion composition in saline soil

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