The initial KOH concentration, the molar ratio of calcium to silicon, and temperature during the hydrothermal process have a critical impact on the phase transformation of K-feldspar, leading …
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With the gradual increase in the demand for lithium, the extraction of lithium from spodumene alone can no longer meet the market demand, while lepidolite, ... The smallest particles may be ultrafine particles generated during the milling process of feldspar or lepidolite. The figure shows that the feldspar fines and lepidolite maintain a ...
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Serdengeçti et al. investigated the production of KCl from a potassium feldspar ore containing 9.69% K 2 O and succeeded in dissolving 99.8% of potassium through water leaching (a 60 °C temperature and a 120 min leaching time) following the roasting process (1:1.5 potassium feldspar—CaCl 2 ratio, 850 °C of temperature, and 60 min of ...
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A novel hydrothermal alkaline process combined with ammonium hydrogen sulfate solution leaching process for improving the comprehensive utilization value of the mineral K-feldspar was developed. In this technology, K-feldspar was first decomposed by the alkaline hydrothermal method, forming kalsilite in the resultant products, where potassium ...
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Common acid leaching methods for potassium extraction are the introduction of phosphate ore, fluorosilicic acid, fluorite and other fluorine-containing substances, to destroy the stable structure of potassium feldspar (Ding, 1996).Sun et al. (2011) established a co-leaching reaction system of phosphate rock, potassium feldspar and phosphoric acid.. At 250 °C for 3 …
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Potassium ion released from the silicate matrix combines with chloride ions to form potassium chloride, which solubilized in water during the leaching process of the roasted feldspar.
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However, one of the main challenges associated with the use of molten salt for K + extraction is the process temperature. The process requires a high-temperature roasting reaction between the salt and the ore. ... For K + extraction from K-feldspar using the CaCl 2-CaCO 3 salt system two different reaction mechanisms were proposed based on the ...
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Complete extraction of potassium was achieved by roasting feldspar with eggshell powder and 1.5 times the stoichiometric amount of hydrochloric acid. The optimized conditions were feldspar to ESP in a ratio of 1:1.8 at 900 °C for 30 min followed by leaching with water.
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The influence of KOH concentration on the phase transition and microstructure transformation of K-feldspar in the hydrothermal process are shown in Fig. 7, ... The Correlation of Roasting Conditions in Selective Potassium Extraction from K-Feldspar Ore. Minerals, 9 (2019), p. 109. Crossref View in Scopus Google Scholar
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process of ceramic tiles, sanitary ceramics, and other products. Considering modern trends in construction and design, the demand for these materials continues to grow. One of the main challenges restraining the extraction of quartz-feldspar raw materials is the relatively high cost of
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This blog reviews the extraction, refining, and processing of feldspar with regard to its use in industries, discussing the main differences between potash and soda feldspar. 1. Mining of …
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A method of potassium extraction from K-feldspar with distiller waste and soda residue as additives is proposed. The e˚ects of roasting temperature, particle size of K-feldspar and the
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The extraction of potassium from a tablet mixture of K-feldspar ore and CaSO 4 by roasting was studied with a focus on the effects of the decomposition behavior of CaSO 4 on the potassium extraction process. The roasted slags were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy, and …
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The data showed that the leaching process of potassium was controlled by the product layer diffusion and the apparent activation energy for the process was found to be 54.67 kJ/mol over the ...
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A process has been reported on the extraction of potassium from feldspar mineral using a mixture of magnesium sulfate and calcium carbonate as the molten media [12]. It has been reported that calcium chloride hexa hydrate can be used as the additive to treat K feldspar forming calcium carbonate and soluble potassium as the products [13]. The
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Sustainable Process for the Extraction of Potassium from Feldspar Using Eggshell Powder. To recover potassium from feldspar, a biowaste, i.e., eggshell, was used. The chief composition of eggshells is calcite. As it is a rich source of Ca, hence it is used with HCl to produce calcium chloride. ... which solubilized in water during the leaching ...
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The extraction of potassium from feldspar was best fitted by the Ginstling and Brounshtein kinetic model. The activation energy of 238.6 KJ/mole and 28.73 KJ/mole for low …
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According to the existing literature reports, there are three sorts of methods to extract potassium from K-feldspar, and they are dry processes, wet processes and …
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The use of molten salt as a melting agent for potassium extraction from various potassium-alumina-silicate minerals has gained interest due to its simple process, low cost, short reaction time, and high potassium extraction efficiency. The process, known as the Roast-Leach method, involves two main steps: roasting the ore using molten salt to ...
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This work focuses on extraction of potassium from feldspar through pyro-hydrometallurgical route. Calcium chloride was used as roasting agent for feldspar. Effect of various operating variables, viz. time, roasting temperature and CaCl2 dose on extent of roasting, were thoroughly studied. Roasting 10 g of feldspar with 17 g of CaCl2 at 900 °C for 1 h resulted …
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A creative approach for the hydrothermal decomposition of K-feldspar for the extraction of potassium (K) in mixed alkaline solutions containing NaOH and CaO pretreated by microwave was studied. Under the same processing conditions, a systematic comparison of microwave pretreatment and traditional hydrothermal reaction showed that K+ dissolution …
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Extraction of feldspar sand and gravel takes place in an open pit with parallel progress of the mining walls. At the quarry, dry extraction is carried out by mining in the wall using a front-wheel loader and extraction from water by means of a suction dredger at the depth of the mining wall under water as deep as 25 m. ... The process of ...
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The process of extracting potassium from K-feldspar via the calcium chloride calcination pathway was studied systematically. The factors affecting the extraction involved the calcination atmosphere, temperature, time, mass ratio of the CaCl 2 /K-feldspar ore and particle size of the K-feldspar ore. The results demonstrated that the high ...
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To recover potassium from feldspar, a biowaste, i.e., eggshell, was used and the shrinking core model was applied to the roast–leach data, and diffusion through the product layer was inferred as the rate-determining step. To recover potassium from feldspar, a biowaste, i.e., eggshell, was used. The chief composition of eggshells is calcite. As it is a rich source of Ca, …
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The overall extraction process of potassium from feldspar and the experimental parameters is depicted in Scheme 1 and Table 2 respectively. The percentage of potassium value extracted from the feldspar is calculated by using Eq. (1). C f …
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Download Citation | On Dec 1, 2024, Guanghui Li and others published Efficient leaching of potassium from K-feldspar in KOH-Ca(OH)2 solution via one-step hydrothermal process | Find, read and cite ...
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Feldspar is an aluminosilicate mineral that bears potassium in the interstitial sites. To unlock the potassium from the interstitial sites, it was roasted with calcium chloride prepared by mixing...
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In this study, potassium extraction from a feldspar ore, which contained microcline, albite, muscovite, and quartz, was studied using chloridizing (CaCl2) roasting followed by leaching. ... and activation that used high temperature (roasting). The results were followed by potassium extraction process through leaching using sulfuric acid 6 N, 20 ...
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An extraction process of potassium from feldspar through a pyro-hydrometallurgical route produced 99.5% pure KCl crystals using different chemicals (Samantray et al., 2019). A novel ...
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The results showed that the optimal process conditions for potassium extraction under this system are as follows: M (fluorite): M (potassium feldspar) = 0.35:1, the mass fraction of 60 % acid, 10 % fluorosilicic acid dosage based on M(H 2 SO 4): M(potassium feldspar) = 1.35:1, M(H 2 SiF 6): M(potassium feldspar) = 0.162:1, 120 °C, 3.5 h. Under ...
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