Depressing effect of flocculants on molybdenite flotation

Castro, Saturnino Sanz de; Laskowski, J.

doi:10.1016/j.mineng.2014.12.027

Cited by 58 publications

(40 citation statements)

References 16 publications

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“…To solve this problem, some studies on using other flocculants instead of lime or Ca-containing flocculants were carried out. Castro and Laskowski (1997, 2004, and 2015) studied the depressing effect of organic flocculants on molybdenum flotation [18][19][20][21]. In their studies, polyacrylamide flocculants (PAM) and non-ionic flocculants (e.g., poly ethylene oxide) have a strong depression on molybdenite flotation.…”

Section: Materials and Reagentsmentioning

confidence: 99%

A New Concept on High-Calcium Flotation Wastewater Reuse

Wan

et al. 2018

Minerals

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Calcium ions are a kind of unavoidable ions in water. It has the deleterious effect on molybdenite flotation. High-calcium flotation wastewater (HCFW) was reused for flotation circuits after the pretreatment removing Ca2+ in from HCFW. The high cost of wastewater treatment limits HCFW reuse. In this paper, an efficient, innovative, low-cost and environmental-friendly flotation wastewater reuse technology was introduced. XLM, as a composite collector for molybdenite, is a mixture of diesel oil (DO) and polycyclic aromatic hydrocarbons (PAHs). It could reduce the deleterious effects of Ca2+ on the flotation of molybdenite in HCFW. Therefore, this was used to replace the pretreatment removing Ca2+ in from high Ca2+ wastewater and saved the cost of wastewater treatment. When XLM consists of 4 wt % PAHs and 96 wt % DO, it has better adaptability than DO in the different Ca2+ concentration of flotation water. The contact angle measurements indicated that PAHs, as a synergistic component of a composite collector, could adsorb on the edges of molybdenite in the presence of Ca2+ by forming PAHs-Ca2+-MoO42− structure to increase the contact angle of fine molybdenite particle and reduce the deleterious effects of Ca2+ on the flotation of molybdenite. The industrial-scale test further that demonstrated XLM can improve the molybdenite roughing recovery and grade by 1.8% and 3.46% compared with DO as the collector in high Ca2+ flotation wastewater. It is feasible and effective to replace high-cost wastewater treatment for molybdenum plants.

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Section: Materials and Reagentsmentioning

confidence: 99%

A New Concept on High-Calcium Flotation Wastewater Reuse

Wan

et al. 2018

Minerals

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“…From calcite precipitation induced by ureolytic bacteria, some authors have evaluated to add divalent metals (e.g., Pb, Zn, Ba and Cd) and radionuclides (e.g., 90 Sr and 60 Co) [61] in a coprecipitation of the contaminants in the original calcite precipitates, which would occur by the isomorphic replacement of the Ca 2+ in the lattice structure and the incorporation in the interstitial positions or at defect vacancies [62,63] generating an important application for biomineralization as a remediation strategy for contaminated groundwater [63].…”

Section: Types Of Biominerals Produced By Ureolytic Bacteriamentioning

confidence: 99%

“…bacterium, resistant to this element. It was determined an 80% removal of 90 Sr from the soluble-exchangeable fraction of the quartz sand of the aquifer. X-ray diffraction detected calcite, vaterite and aragonite along with a solid solution of calcite-strontianite (SrCO 3 ) in a bioremediated sample indicating that Sr was incorporated into calcite.…”

Section: Application Of Ureolytic Bacteria For the Removal Of Heavy Mmentioning

confidence: 99%

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Biomineralization Mediated by Ureolytic Bacteria Applied to Water Treatment: A Review

2017

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Abstract:The formation of minerals such as calcite and struvite through the hydrolysis of urea catalyzed by ureolytic bacteria is a simple and easy way to control mechanisms, which has been extensively explored with promising applications in various areas such as the improvement of cement and sandy materials. This review presents the detailed mechanism of the biominerals production by ureolytic bacteria and its applications to the wastewater, groundwater and seawater treatment. In addition, an interesting application is the use of these ureolytic bacteria in the removal of heavy metals and rare earths from groundwater, the removal of calcium and recovery of phosphate from wastewater, and its potential use as a tool for partial biodesalination of seawater and saline aquifers. Finally, we discuss the benefits of using biomineralization processes in water treatment as well as the challenges to be solved in order to reach a successful commercialization of this technology.

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“…As a water-soluble synthetic organic polymer, PAM is able to produce large flocs for water treatment or flotation by hydrogen bonding adsorption, chemisorption, and bridging adsorption [7]. However, PAM usually takes a long time to degrade naturally in the water system [9,10], and sometimes a large addition of PAM could lead to an adverse effect on the following flotation separations of the target minerals [11] due to agglomerates containing many gangue particles. Chang [12] reported that a large concentration of 10-15 mg/L APAM used for the bauxite tailings sedimentation produced bad flotation selectivity in the following flotation process when the wastewater after the flocculation is recycled in the flotation.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Flocculation and Sedimentation of Iron Tailings Slurry Based on the Regulating Behavior of Fe3+

Tao

Chen

et al. 2018

Minerals

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Based on the regulating behavior of Fe 3+ , flocculation and sedimentation tests of iron tailings slurry flocculated using 2 mg/L anionic polyacrylamide (APAM) were studied, including the tests of Fe 3+ dosage, regulating time, and pH. Flocculation-sedimentation tests showed that: a recommended addition of 56 mg/L Fe 3+ produced a surprisingly bad flocculation effect; sedimentation ability decreased with the increase of regulating time, however, the regulating ability during the first 1 min was low; Fe 3+ displayed a high regulating effect at pH 6-7, and then decreased with the increase of slurry pH. Size analysis demonstrated that the regulating ability of Fe 3+ was related to the change of floc size, which increased with the decrease of size. Zeta potential analysis and calculation showed that small concentrations of Fe 3+ and certain hydroxyl complex ions (such as Fe(OH) 2+ and Fe(OH) 2 + ) adsorbed onto the APAM molecular chains, resulting in a decreased charge density of the APAM molecules, and this electrostatic adsorption was able to make the polymer curl more easily. Fourier Transform Infrared Spectroscopic (FTIR) indicated the APAM on the hematite was slightly degraded into a monomer-like short-chain polymer while adding certain concentration of Fe 3+ . Scanning Electron Microscope (SEM) imaging showed that the network structure of APAM molecules treated by Fe 3+ collapsed, and the APAM adsorption amount on hematite was significantly reduced. Therefore, the effect of Fe 3+ on the APAM could be recommended as a new method for desorption and degradation of the APAM contained in the tailings slurry or flocs.

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Depressing effect of flocculants on molybdenite flotation

Cited by 58 publications

References 16 publications

A New Concept on High-Calcium Flotation Wastewater Reuse

A New Concept on High-Calcium Flotation Wastewater Reuse

Biomineralization Mediated by Ureolytic Bacteria Applied to Water Treatment: A Review

A Study on the Flocculation and Sedimentation of Iron Tailings Slurry Based on the Regulating Behavior of Fe3+

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