Precipitation behavior of Ca(OH)2, Mg(OH)2, and Mn(OH)2 from CaCl2, MgCl2, and MnCl2 in NaOH-H2O solutions and study of lithium recovery from seawater via two-stage precipitation process

Um, Namil; Hirato, Tetsuji

doi:10.1016/j.hydromet.2014.04.006

Cited by 85 publications

(27 citation statements)

References 17 publications

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“…However, this method cannot remove the impurities in the CCM (such as SiO 2 and Fe 2 O 3 ), so it only produces low-value MH product. Another usable route is as follows: first MgO in the CCM is converted into Mg 2+ solution by acid leaching, and then the remaining insoluble impurities can be filtrated before the Mg 2+ solution is used to precipitate MH by the reaction with alkali, such as NaOH and Ca(OH) 2 (Um and Hirato, 2014;Xiong et al, 2014). However, as inorganic acid, such as H 2 SO 4 , HNO 3 or HCl, is used, not only the production cost is obviously increased, but also some undesired impurities, particularly Fe, can be appreciably dissolved in the leaching process (Demir et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Preparation of Mg(OH)2 with caustic calcined magnesia through ammonium acetate circulation

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Preparation of Mg(OH)2 with caustic calcined magnesia through ammonium acetate circulation

et al. 2015

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“…To obtain lithium concentrate, the dissolution of the co-precipitate after an ion exchange process is used. A hydrometallurgical process for extracting lithium from seawater using an adsorption process with a manganese oxide adsorbent followed by a deposition process reported by Um and Hirato [99]. By this method, at a temperature of (25-90°C), MgCl 2 and CaCl 2 from seawater were precipitated as Mg(OH) 2 and Ca(OH) 2 .…”

Section: Co-precipitation Methods For Extracting Lithium From Seawatermentioning

confidence: 99%

Lithium Recovery from Brines Including Seawater, Salt Lake Brine, Underground Water and Geothermal Water

Samadiy¹,

Yu²,

Li³

et al. 2020

Thermodynamics and Energy Engineering

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Demand to lithium rising swiftly as increasing due to its diverse applications such as rechargeable batteries, light aircraft alloys, air purification, medicine and nuclear fusion. Lithium demand is expected to triple by 2025 through the use of batteries, particularly electric vehicles. The lithium market is expected to grow from 184,000 TPA of lithium carbonate to 534,000 TPA by 2025. To ensure the growing consumption of lithium, it is necessary to increase the production of lithium from different resources. Natural lithium resources mainly associate within granite pegmatite type deposit (spodumene and petalite ores), salt lake brines, seawater and geothermal water. Among them, the reserves of lithium resource in salt lake brine, seawater and geothermal water are in 70-80% of the total, which are excellent raw materials for lithium extraction. Compared with the minerals, the extraction of lithium from water resources is promising because this aqueous lithium recovery is more abundant, more environmentally friendly and cost-effective.

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“…The pH increase caused by the LDH was most likely responsible for the removal of some of the other ions from water, namely Mg, Cu, Zn, and P. While LDH has been studied as a sorbent for Cu 2+ , Mg 2+ , and Zn 2+ removal, these processes were carried out below pH 6 [85][86][87][88]. Hence, the removal of Mg, Cu, and Zn from the wastewaters in our study was likely through precipitation, as Mg(OH) 2 , Cu(OH) 2 , and Zn(OH) 2 will form above pH 9.5, 7.5, and pH 8.7, respectively [89,90]. The absence of new reflections in the post-mortem XRD patterns (Figure 8) indicated that precipitated compounds (e.g., of Mg, Cu, and Zn hydroxides) were amorphous or in quantities insufficient for detection.…”

Section: Removal Of Other Species From the Watermentioning

confidence: 99%

Layered Double Hydroxide Sorbents for Removal of Selenium from Power Plant Wastewaters

Chowdhury

Kraetz

et al. 2019

ChemEngineering

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Selenium is an essential trace element but is increasingly becoming a contaminant of concern in the electric power industry due to the challenges of removing solubilized selenate anions, particularly in the presence of sulfate. In this work, we evaluate granulated layered double hydroxide (LDH) materials as sorbents for selenium removal from wastewaters obtained from a natural gas power plant with the aim to elucidate the effect of competing ions on the sorption capacities for selenium removal. We first present jar test data, followed by small-scale column testing in 0.43 inch (1.1 cm) and 2 inch (5.08 cm) diameter testbed columns for the treatment of as-obtained cooling tower blowdown waters and plant wastewaters. Finally, we present field results from a pilot-scale study evaluating the LDH media for treatment of cooling tower blowdown water. We find that despite the high levels of total dissolved solids and competing sulfate ions, the selenium oxoanions and other regulated metals such as chromium and arsenic are successfully removed using LDH media without needing any pre-treatment or pH adjustment of the wastewater.

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Precipitation behavior of Ca(OH)2, Mg(OH)2, and Mn(OH)2 from CaCl2, MgCl2, and MnCl2 in NaOH-H2O solutions and study of lithium recovery from seawater via two-stage precipitation process

Cited by 85 publications

References 17 publications

Preparation of Mg(OH)2 with caustic calcined magnesia through ammonium acetate circulation

Preparation of Mg(OH)2 with caustic calcined magnesia through ammonium acetate circulation

Lithium Recovery from Brines Including Seawater, Salt Lake Brine, Underground Water and Geothermal Water

Layered Double Hydroxide Sorbents for Removal of Selenium from Power Plant Wastewaters

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