Kinetics of roasting potash feldspar in presence of sodium carbonate

Liu, Jianan; Zhai, Yuchun; Wu, Yan; Zhang, Jun; Shen, Xiangqian

doi:10.1007/s11771-017-3559-9

Cited by 22 publications

(3 citation statements)

References 18 publications

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“…Several models describing solid-liquid reactions have been proposed to investigate the rate-controlling steps in hydrometallurgy. These models are widely discussed in the literature (Levenspiel, 1999;Liddell, 2005) and their application proved useful in previous studies dealing with mineral ores roasting (Tathavadkar et al, 2001;Antony et al, 2006;Liu et al, 2017). Assuming that a coltan mineral particle has a spherical shape, three models (based on the shrinking core theory) are tested here and compared to identify the rate-controlling step during KOH roasting.…”

Section: Kinetic Modelsmentioning

confidence: 99%

Extraction of Nb and Ta from a coltan ore from South Kivu in the DRC by alkaline roasting – thermodynamic and kinetic aspects

Shikika

Muvundja²,

Mugumaoderha

et al. 2021

Minerals Engineering

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Section: Kinetic Modelsmentioning

confidence: 99%

Extraction of Nb and Ta from a coltan ore from South Kivu in the DRC by alkaline roasting – thermodynamic and kinetic aspects

Shikika

Muvundja²,

Mugumaoderha

et al. 2021

Minerals Engineering

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“…BCFA is stored on the ground using heap storage, which is prone to environmental problems such as air and soil pollution due to its fine particles. According to current literature, potassium extraction methods include high-temperature reaction methods [6][7][8]. Inorganic acid decomposition method [9,10] microbial decomposition method [11][12][13][14]; hydrothermal method [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Recovery of K by NH₄HSO₄ low-temperature roasting from brown corundum Fly Ash

Lin¹,

Chen²,

Li³

et al. 2022

Mater. Res. Express

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Brown corundum dust ash(BCFA) is an industrial solid waste from the brown corundum production process. The alkali metal is a key factor limiting its comprehensive use. Currently, BCFA is mainly stockpiled and occupies a large amount of land. Its fine particles are easy to cause air pollution. The addition of NH4HSO4 allows for the effective extraction of K from BCFA and the efficient use of BCFA. Under optimum conditions: NH4HSO4 to BCFA mass ratio of 1.2:1, the roasting temperature of 240 ℃, roasting time of 2 h, water leaching time of 90 min, water leaching temperature of 65 ℃ water leaching liquid to solid ratio of 3:1, the leaching rate of K from BCFA reached 97%. The leachate was crystallised by evaporation to obtain K, N compound fertiliser for agricultural use. The leaching residue is mainly Al and Si, which can be used for the preparation of refractory materials, aluminium and silicon molecular sieves, construction materials and other raw materials.

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“…This method, also called hydrothermal treatment, helps accelerate chemical weathering. Different additives have been used, such as NaNO 3 , MgSO 4 , CaCO 3 , CaCl 2 , NaCl, NaOH, CaO(OH) 2 , K 2 CO 3 , Ca 3 (PO 4 ) 2 , and Na 2 CO 3 [13,[32][33][34]. For instance, Liu et al (2019b) and Wang et al (2018) studied the recovery of potassium from potassic syenite, which contain 10.38% and 12.46% K 2 O, respectively [25,35].…”

Section: Introductionmentioning

confidence: 99%

Alkali-Hydrothermal Treatment of K-Rich Igneous Rocks for Their Direct Use as Potassic Fertilizers

et al. 2021

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Due to the increasing demand for conventional sources of potassium (K) and their inaccessibility by African countries, K-rich igneous rocks are increasingly studied as potential alternative sources. In this study, six potassic igneous rocks (syenites and trachytes) from the Tamazeght, Jbel Boho, Ait Saoun, and El Glo’a regions (Morocco) were sampled and characterized. Then they were hydrothermally treated to enhance their K release for potential use as potassic fertilizers. The raw materials are mainly formed by microcline (up to 74%), orthoclase (20–68%), albite (36–57%), biotite-muscovite (15–23%), and titanite, calcite, hematite, and apatite as accessory minerals. These samples were crushed and milled to reach a particle size <150 µm and mixed with 4 N NaOH solution in an autoclave. The liquid/solid (L/S) ratio was about 44 mL/50 g. The powders were allowed to react with the solution at 170 °C for 7 h. For all tests, NaOH reacted completely with the powders and no liquid was observed after the treatment. X-ray diffraction (XRD), thermal gravimetric analysis (TGA), infrared spectroscopy (IRTF), and scanning electron microscopy (SEM-EDS) were carried out on treated samples to characterize the mineralogical and structural changes due to the alkali-hydrothermal treatment. Indeed, the treated samples revealed the presence of sodic neoformed phases such as thermonatrite, sodalite, analcime, and cancrinite. The treated material was leached for a week using deionized water and the elements released were measured using inductively coupled plasma–atomic emission spectroscopy (ICP-AES). The hydrothermal process showed a strong effect on structure breakdown as well as on the release of K and other nutrients such as P, Fe, Si, Mg, and Ca. Therefore, the alkali-hydrothermal treatment allowed the release of 50.5 wt% K. Moreover, the release of Mg, Ca, Fe, P, K, and Si were significantly increased. Mg, Ca, Fe, P, K, and Si release within raw materials was about (0.5–3.6), (3.5–31.4), (0.01–0.4), (0.01–0.3), (20–55), and (4.6–8) mg/kg, respectively, whereas treated samples showed a higher release of these elements. Quantitatively, Mg, Ca, Fe, P, K, and Si releases were about (10–11.8), (60–70), (7–20), (1.2–15), (218–1278), and (1119–2759) mg/kg, respectively. Consequently, the treated igneous rocks (syenite and trachyte) could be directly used as potassic fertilizers that would also be a source of other nutrients.

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Kinetics of roasting potash feldspar in presence of sodium carbonate

Cited by 22 publications

References 18 publications

Extraction of Nb and Ta from a coltan ore from South Kivu in the DRC by alkaline roasting – thermodynamic and kinetic aspects

Extraction of Nb and Ta from a coltan ore from South Kivu in the DRC by alkaline roasting – thermodynamic and kinetic aspects

Recovery of K by NH₄HSO₄ low-temperature roasting from brown corundum Fly Ash

Alkali-Hydrothermal Treatment of K-Rich Igneous Rocks for Their Direct Use as Potassic Fertilizers

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Kinetics of roasting potash feldspar in presence of sodium carbonate

Cited by 22 publications

References 18 publications

Extraction of Nb and Ta from a coltan ore from South Kivu in the DRC by alkaline roasting – thermodynamic and kinetic aspects

Extraction of Nb and Ta from a coltan ore from South Kivu in the DRC by alkaline roasting – thermodynamic and kinetic aspects

Recovery of K by NH4HSO4 low-temperature roasting from brown corundum Fly Ash

Alkali-Hydrothermal Treatment of K-Rich Igneous Rocks for Their Direct Use as Potassic Fertilizers

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Recovery of K by NH₄HSO₄ low-temperature roasting from brown corundum Fly Ash