Potassium silicate: A slow-release potassium fertilizer

Tokunaga, Y.

doi:10.1007/bf01048827

Cited by 25 publications

(21 citation statements)

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“…Despite its simplicity, this approach has not yet been successfully implemented in mainstream agriculture, possibly due to the slow rate of potassium release from the majority of tested minerals. 1,[9][10][11]19 The design of chemical processing to extract potassium and aluminium from earth-abundant K-bearing silicates is also a multi-century endeavour, traced back to 1856 and still pursued. 20,21 Two main approaches have been proposed: hightemperature ( pyrometallurgy) and hydrothermal treatment.…”

Section: Antoine Allanorementioning

confidence: 99%

Aqueous alteration of potassium-bearing aluminosilicate minerals: from mechanism to processing

Skorina

Allanore

2015

Green Chem.

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Section: Antoine Allanorementioning

confidence: 99%

Aqueous alteration of potassium-bearing aluminosilicate minerals: from mechanism to processing

Skorina

Allanore

2015

Green Chem.

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“…KAlSiO 4 has a structure similar to K 2 MgSi 3 O 8 which is a conventional slow-release potassium fertilizer [27][28][29][30]. Because of the slower dissolution rates, the mineral potassium fertilizers are more efficient than chemical fertilizers for crops.…”

Section: Effects Of K 2 Co 3 Contentmentioning

confidence: 99%

Preparation and effectiveness of slow‐release silicon fertilizer by sintering with iron ore tailings

Zhang

Zhou

et al. 2017

Env Prog and Sustain Energy

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Recycling of iron ore tailings (IOT) which are by‐products of iron ore processing has attracted attention but there have been few studies on their use as fertilizers. In this study, slow‐release silicon fertilizers are prepared from iron tailings by solid‐phase sintering and characterized by X‐ray diffraction (XRD) and scanning electron microscopy (SEM). The solubility results acquired from the optimal sample (Si‐IOT) indicate that the available SiO2 is 20.77% and that of available K2O is 18.43% in 0.50 mol L−1 HCl. For 10 g of Si‐IOT in 200 mL of distilled water at 25°C, the cumulative release of K2O is 4.32% in the first day and 19.4% in 28 days and that of SiO2 is 2.12% in the first day and 16.30% in 28 days. The performance satisfies the Chinese national standard for slow‐release fertilizers and Chinese agricultural standard for silicon fertilizers. The results obtained from Si‐IOT pertaining to release of heavy metals indicate that heavy metals will not affect the quality of the crops and pakchoi growth is improved. Hence, they are potential raw materials for slow‐release silicon fertilizers. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1011–1019, 2018

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“…At the process of synthesizing SPF by use of PMS and K 2 CO 3 , K 2 CO 3 decomposed at 800~1000°C into K 2 O and CO 2 , and K 2 O reacted with CaO, SiO 2 , or MgO in PMS to produce the potassium silicate crystalline phases (Ca 1.917 K 0.166 SiO 4 , K 2 MgSiO 4 , K 4 CaSi 3 O 9 ) and amorphous phases. In previous studies, Ca 1.917 K 0.166 SiO 4 and K 2 MgSiO 4 have been found in the synthetic slowrelease K fertilizer: Yamada et al studied the preparation of a slow-release potassium fertilizer using rice husks, dolomite, and potassium carbonate, and Tokunaga et al synthesized a slow-release potassium fertilizer using coal ash and KOH, and both studies found that K 2 MgSiO 4 in the fertilizers was the slow-release characteristic (Yamada et al, 1994;Tokunaga et al, 1991); Shen et al investigated the crystallizability of a slow-release potassium silicate fertilizers, the result showed that the existence of Ca 1.917 K 0.166 SiO 4 and the amorphous phase in the fertilizer was the main cause for the slow-release characteristic of the fertilizer (Shen et al, 2005). The major constituent phases in SPF are the crystalline phases Ca 1.917 K 0.166 SiO 4 , K 2 MgSiO 4 , and K 4 CaSi 3 O 9 and the amorphous phases, which facilitated the release of indissoluble nutrients such as Ca, Si, and Mg from the SPF, but slowed the release of K; as a result, SPF possesses the slow-release characteristic.…”

Section: Microstructure and Mineralogical Composition Of Spfmentioning

confidence: 99%

Synthesis of a novel slow-release potassium fertilizer from modified Pidgeon magnesium slag by potassium carbonate

Yongling

Cheng

2016

Journal of the Air & Waste Management Association

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A novel slow-release potassium fertilizer (SPF) was synthesized using Pidgeon magnesium slag (PMS) and potassium carbonate, which could minimize fertilizer nutrient loss and PMS disposal problems. Orthogonal experiments were conducted to determine the optimum conditions for synthesis. The potassium (K)-bearing compounds of SPF existed mainly in the form of crystalline phases Ca 1.197 K 0.166 SiO 4 , K 2 MgSiO 4 , and K 4 CaSi 3 O 9 , and in the noncrystalline phase. The active silicon content of SPF was 2.09 times as much as that of magnesium slag, and the slow-release character of SPF met the requirement for partly slow-release fertilizer in the national standard (GB/ T23348-2009). The best models for describing the K release kinetics in water and 2% citric acid were the Elovich model and the first-order model, respectively. The heavy metal contents of SPF conformed to the national standard for organic-inorganic compound fertilizers, and the leaching mass concentrations of heavy metals and Fluorine were far lower than the limit values of the identification standard for hazardous waste identification for extraction toxicity (GB5085. , and also met the class II quality standard for ground water. The environmental risk of SPF is therefore very low, but because SPF is alkaline, its effect on soil pH should be taken into account.Implications: PMS is the solid waste resulting from the production of magnesium metal by Pidgeon's reduction process. Utilization of PMS in the high-technology and high-value areas may promote the high-efficiency development of worldwide collection metallic magnesium industry and contribute to the reduction of emissions of fine dust to air. This paper presents one of the new techniques in the use of PMS as a slow-release fertilizer by adding K 2 CO 3 . The product can serve as a very cost-effective and reliable artificial fertilizer.PAPER HISTORY

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Potassium silicate: A slow-release potassium fertilizer

Cited by 25 publications

References 0 publications

Aqueous alteration of potassium-bearing aluminosilicate minerals: from mechanism to processing

Aqueous alteration of potassium-bearing aluminosilicate minerals: from mechanism to processing

Preparation and effectiveness of slow‐release silicon fertilizer by sintering with iron ore tailings

Synthesis of a novel slow-release potassium fertilizer from modified Pidgeon magnesium slag by potassium carbonate

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