Hydrothermal decomposition of K-feldspar in KOH–NaOH–H2O medium

Su, Shi-Bing; Ma, Hongwen; Chuan, Xiuyun

doi:10.1016/j.hydromet.2015.05.014

Cited by 55 publications

(34 citation statements)

References 21 publications

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“…Herein, we conclude that increase in x Na resulted in the transformation from tobermorite to pectolite. In pure NaOH solution ( x Na = 1.0), the unique hydroxycancrinite was in accordance with our previous work . In NASH system, zeolites formation was a function of bulk composition and hydrothermal conditions.…”

Section: Discussionsupporting

confidence: 90%

“…However, hydrothermal processing on K‐feldspar requires its structural destruction. The key step for K‐feldspar dissolution under alkaline conditions is expressed as Equation ; during which, potassium is accessible to solution. For other minerals such as plagioclase and quartz, the same dissolution behavior happened during hydrothermal process (Equations and ).…”

Section: Discussionmentioning

confidence: 99%

“…Ciceri et al developed an approach to generate potassium fertilizer via hydrothermal alteration of K‐feldspar ore in Ca (OH) 2 medium at 200°C, but only about 17% of K‐feldspar truly reacted into calcium–silicate–hydrate compounds (CSHs: hydrogrossular, α‐dicalcium silicate hydrate, tobermorite, etc.). When treated in KOHNaOH mixed medium, kalsilite maintains as stable product within Na/(K + Na) molar ratio of 0.7 (240°C) or 0.6 (280°C) for the initial solution . After all, detailed knowledge and experimental exploration related to the hydrothermal alteration of K‐feldspar are required.…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal reaction of K‐feldspar powder in NaOHCa (OH)₂ mixed medium

Liu

Gao

2019

Asia-Pacific J Chem Eng

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The hydrothermal reactions between K‐feldspar powder and NaOHCa (OH)2 mixed alkaline medium at 240°C were investigated. The effects of Na ratio (xNa, Na2O/(Na2O + CaO) in mole) on the phase and composition change in solid products were explored in detail. Results showed that increase in xNa led to the orderly formation of compounds following the sequence of CaOSiO2H2O → Na2OCaOSiO2H2O → Na2OAl2O3SiO2H2O, and K+ was accessible into solution after reaction. The new products after reaction was tobermorite, pectorite, nepheline hydrate, analcime, and hydroxycancrinite, depending on different xNa. The hydrothermal reaction was deduced to be a coupled dissolution and reprecipitation process, which was governed by the chemical equilibrium with the change in solution chemistry.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrothermal reaction of K‐feldspar powder in NaOHCa (OH)₂ mixed medium

Liu

Gao

2019

Asia-Pacific J Chem Eng

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“…As seen in Figure B, SiO 2 continued to be removed from the remaining microcline in alkaline conditions of the hydrothermal treatment, but small amounts of microcline and albite still co‐existed with the generated kaliophilite because of the inadequate removal of SiO 2 . The main reaction is as follows:

K A l S i_{3} O_{8} (s) + 4 K O H \to K A l S i O_{4} (s) + 2 K_{2} S i O_{3} + 2 H_{2} O

…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Zeolite W from Potassic Rocks Activated by KOH Sub‐molten Salt Method

Zhao

Zhang

et al. 2018

Crystal Research and Technology

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Potassic rocks are decomposed to active amorphous material via KOH sub‐molten salt method. Zeolite W is successfully synthesized using amorphous precursor from potassic rocks as raw material. Effects of reaction temperature, reaction time, mass concentration of KOH and mass ratio of KOH‐to‐ore on the decomposition of potassic rocks are investigated. X‐ray powder diffraction (XRD) is used to characterize the precursors and as‐prepared zeolites. The results indicate that the active amorphous precursor is obtained in KOH sub‐molten salt medium with 75% alkali mass concentration and an alkali‐to‐ore mass ratio of 3.5:1 at 200 °C for 7 h. The exchange capacities of modified zeolite W in KCl solution and simulated seawater are 156.8 mgK+/g and 38.39 mgK+/g, respectively. After synthesis of zeolite W, the mother liquor can be recycled.

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“…Hal ini sejalan, Penelitian yang dilakukan oleh Su & Yeh (2015), yaitu semua hasil statistik menunjukkan bahwa Instruksi animasi fisika adalah untuk memperkaya teks fisika, untuk memajukan prestasi belajar positif siswa jurusan teknik yang mengikuti kursus fisika. Hasil penelitian ini juga memberikan kontribusi besar terhadap hasil belajar kinerja siswa yang meningkatkan pemahaman fisika siswa.…”

Section: Pendahuluanunclassified

Pembelajaran Fisika menggunakan Media Animasi Macromedia Flash-MX dan Gambar untuk Meningkatkan Pemahaman Konsep Mahasiswa

Yuliani

2017

JIPFAlBiruni

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Abstract:The objectives of the study are: (1) to measure the improvement of the conceptual understanding of the students by using Animated Macromedia (2) Abstrak: Penelitian ini bertujuan: (1) untuk mengetahui peningkatan pemahaman konsep mahasiswa dengan menggunakan Media Animasi Macromedia Flash -MX dan Gambar pada mata kuliah Fisika Kuantum; (2) Untuk mengetahui respon mahasiswa setelah diterapkan Media Animasi Macromedia Flash -MX dan Gambar pada mata kuliah Fisika Kuantum. Hasil penelitian menunjukkan bahwa: (1) Nilai pretest pemahaman sebelum dilaksanakan pembelajaran oleh peneliti sebesar (33,02) tidak jauh berbeda dengan nilai pada post test (46,25), nilai gain yang diperoleh sebesar (13,23), nilai N-gain yang diperoleh (0,19) dengan kategori rendah. Terdapat peningkatan pembelajaran fisika kuantum dengan menggunakan Media Animasi Macromedia Flash -MX dan Gambar pada mata kuliah Fisika Kuantum dengan kategori rendah; (2) Respon mahasiswa terhadap pembelajaran fisika kuantum dengan menggunakan Media Animasi Macromedia Flash -MX dan Gambar pada mata kuliah Fisika Kuantum pada umumnya siswa menyatakan senang (100 %), siswa merasa baru (100 %), dan siswa merasa bermanfaat (100 %), Respon untuk perasaan mahasiswa terhadap Lembar Kerja Mahasiswa (LKM) aplikasi persamaan Schrodinger untuk sistem potensial sederhana umumnya menyatakan sulit (85%) dan respon mahasiswa untuk soal-soal aplikasi persamaan Schrodinger untuk sistem potensial sederhana dianggap masih sulit (90%).

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Hydrothermal decomposition of K-feldspar in KOH–NaOH–H2O medium

Cited by 55 publications

References 21 publications

Hydrothermal reaction of K‐feldspar powder in NaOHCa (OH)₂ mixed medium

Hydrothermal reaction of K‐feldspar powder in NaOHCa (OH)₂ mixed medium

Synthesis of Zeolite W from Potassic Rocks Activated by KOH Sub‐molten Salt Method

Pembelajaran Fisika menggunakan Media Animasi Macromedia Flash-MX dan Gambar untuk Meningkatkan Pemahaman Konsep Mahasiswa

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Hydrothermal decomposition of K-feldspar in KOH–NaOH–H2O medium

Cited by 55 publications

References 21 publications

Hydrothermal reaction of K‐feldspar powder in NaOHCa (OH)2 mixed medium

Hydrothermal reaction of K‐feldspar powder in NaOHCa (OH)2 mixed medium

Synthesis of Zeolite W from Potassic Rocks Activated by KOH Sub‐molten Salt Method

Pembelajaran Fisika menggunakan Media Animasi Macromedia Flash-MX dan Gambar untuk Meningkatkan Pemahaman Konsep Mahasiswa

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Hydrothermal reaction of K‐feldspar powder in NaOHCa (OH)₂ mixed medium

Hydrothermal reaction of K‐feldspar powder in NaOHCa (OH)₂ mixed medium