Mechanochemical conversion of chrysotile/K2HPO4 mixtures into potential sustainable and environmentally friendly slow-release fertilizers

Borges, Roger; Baika, Loana Mara; Grassi, Marco Tadeu

doi:10.1016/j.jenvman.2017.11.082

Cited by 25 publications

(18 citation statements)

References 29 publications

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“…Quartz is resistant to milling as already described for other systems. 19,25,27,28 In the case of CCRS/K 2 HPO 4 -16 min (Figure 1j), only low intensity peaks of quartz and calcium carbonate could be detected, indicating that K 2 HPO 4 has an positive effect in the mixture amorphization, as already reported for chrysotile itself. 29 Figure 2 presents the results obtained by the reduction of the calcite crystalline domains sizes by using the Scherrer equation:…”

Section: Resultssupporting

confidence: 72%

“…16,24 Two sets of samples were prepared, in the first 15.012 g of raw CCRS material and in the second, 15.030 g of CCRS in the presence of 1.102 g of K 2 HPO 4 (molar ratio chrysotile:K 2 HPO 4 of approximately 1:2). 25 Although K 2 HPO 4 has been used in all experiments because of its availability, any potassium phosphate phase like K 2 HPO 4 or K 3 PO 4 could also be milled, resulting in similar materials. The samples were placed in tungsten carbide grinding vessels with volume of 250 mL, the pneumatic clamping device was closed and the mixture was milled at 1420 rpm in a Herzog HSM 100P vibration disk mill.…”

Section: Introductionmentioning

confidence: 99%

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Potential Slow Release Fertilizers and Acid Soil Conditioners Obtained by One-Pot Mechanochemical Activation of Chrysotile:Cement Roofing Sheets with K2HPO4

Borges

2018

J. Braz. Chem. Soc.

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Chrysotile:cement roofing sheets were milled with and without K 2 HPO 4. As indicated by X-ray diffraction (XRD), the samples crystallinities were reduced with the increasing milling time. The same tendency was observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), with disaggregation of the chrysotile fiber bundles and formation of non-fibrous micrometric agglomerate particles. After milling for 16 min, most of the phases present in the cement and chrysotile were transformed into amorphous materials, except quartz, in which the structure integrity was preserved, and calcium carbonate, where the particles were reduced to nanometric size. Both milled samples were submitted to release experiments in water, where the characteristics of a potential slow release fertilizer and acid soil conditioner were observed. The process is a viable alternative not only to eliminate the hazard of chrysotile fibers without the need to remove them from the cement matrix, but also as aggregation value to the milled almost amorphous mixture.

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Section: Resultssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Potential Slow Release Fertilizers and Acid Soil Conditioners Obtained by One-Pot Mechanochemical Activation of Chrysotile:Cement Roofing Sheets with K2HPO4

Borges

2018

J. Braz. Chem. Soc.

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“…Based on urea as an SRF component, polymers [20,21], clay minerals such as montmorillonite [22,23], and kaolinite [24,25] were investigated. Clay minerals are environmentally stable and cheap for the synthesis of SRF [10,11,[26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

et al. 2019

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We investigated the mechanochemical synthesis of complex slow release fertilizers (SRF) derived from glauconite. We studied the effectiveness of the mechanical intercalation of urea into glauconite using planetary and ring mills. The potassium-nitric complex SRFs were synthesized via a mechanochemical method mixing glauconite with urea in a 3:1 ratio. The obtained composites were analyzed using X-ray diffraction analysis, scanning electron microscopy, X-ray fluorescence analysis, and infrared spectroscopy. The results show that as duration of mechanochemical activation increases, the mineralogical, chemical, and structural characteristics of composites change. Essential modifications associated with a decrease in absorbed urea and the formation of microcrystallites were observed when the planetary milling time increased from 5 to 10 min and the ring milling from 15 to 30 min. Complete intercalation of urea into glauconite was achieved by 20 min grinding in a planetary mill or 60 min in a ring mill. Urea intercalation in glauconite occurs much faster when using a planetary mill compared to a ring mill.

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“…Some authors propose that a natural exfoliation of clays by dry milling with urea can occur, increasing the interaction and leading to higher efficiency for nutrient release. 66,67 Other clays and related minerals, such as halloisites 68 and some phyllosilicates, 69,70 were studied and applied as coatings using aqueous suspensions over conventional fertilizers (urea and MAP) with some field results indicating efficiency. 71 However, compared to zeolite mixtures, field studies about clay:fertilizer mixtures are scarcely reported.…”

Section: Ion Exchange In Support Mineralsmentioning

confidence: 99%

Why nonconventional materials are answers for sustainable agriculture

Ribeiro

2019

MRS Energy & Sustainability

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Mechanochemical conversion of chrysotile/K2HPO4 mixtures into potential sustainable and environmentally friendly slow-release fertilizers

Cited by 25 publications

References 29 publications

Potential Slow Release Fertilizers and Acid Soil Conditioners Obtained by One-Pot Mechanochemical Activation of Chrysotile:Cement Roofing Sheets with K2HPO4

Potential Slow Release Fertilizers and Acid Soil Conditioners Obtained by One-Pot Mechanochemical Activation of Chrysotile:Cement Roofing Sheets with K2HPO4

Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

Why nonconventional materials are answers for sustainable agriculture

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