Textural and structural characteristics of phosphorites from the Polpinsky deposit

Почиталкина, И. А.; Kondakov, D. F.; Артамонова, О. А.; Vinokurova, O. V.

doi:10.1134/s0036023617110146

Cited by 5 publications

(1 citation statement)

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“…Moreover, Donatello et al [46] studied seven different samples of incinerated BSS ash (precisely FA) and evaluated a P content of 5.7-7.8%. This P content was decidedly lower than usual content in the minerals (e.g., phosphorites and apatite) used as source to extract P [47][48][49][50]. However, it was considerable and could make this waste a sustainable alternative source to produce phosphate fertilizers.…”

Section: Fa and Ba Characterizationmentioning

confidence: 99%

Extraction and Purification of Phosphorus from the Ashes of Incinerated Biological Sewage Sludge

Baldi

Martinotti

Sorlini

et al. 2021

Water

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Phosphorus depletion represents a significant problem. Ash of incinerated biological sewage sludge (BSS) contains P, but the presence of heavy metals (e.g., Fe and Al) is the main issue. Based on chemical characterization by SEM-EDS, ED-XRF and ICP-OES techniques, the characteristics and P content of bottom ash (BA) and fly ash (FA) of incinerated BSS were very similar. On BA, P extraction carried out in counter- current with an S:L ratio of 1:10 and H2SO4 0.5 M led to better extraction yields than those of a similar test with H2SO4 1 M and an S:L ratio of 1:5 (93% vs. 86%). Comparing yields with H2SO4 0.5 M (S:L ratio of 1:10), the counter-current method gave better results than those of the crossflow method (93% vs. 83.9%), also improving the performance obtained with HCl in crossflow (93% vs. 89.3%). The results suggest that the purification of the acid extract from heavy metals with pH variation was impractical due to metal precipitation as phosphates. Extraction with H2SO4 and subsequent treatment with isoamyl alcohol represented the best option to extract and purify P, leading to 81% extraction yields of P with low amounts of metals.

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