Characterization of sunflower husk ashes and feasibility analysis of their incorporation in soil and clay mixtures for ceramics

Abstract

The aim of this work is to study ashes from the combustion of sunflower husks in order to determine their environmental suitability for reuse as a structural filler or as an aggregate in clay mixtures for the manufacture of ceramics. Various characterization techniques were used, such as optical and electronic microscopy, X-ray electron dispersive analysis, X-ray diffraction, analysis of particle size distribution, soluble solids, conductivity, pH, leaching test and ecotoxicity, among others. The results of chemical analysis show that the main elements are Mg, Ca, and P. The conductivity and pH values after 2h of stirring in distilled water are 17.11 mS and 11.46, respectively. Results from analysis of the leaching test determine that none of the measured values in the ashes exceed the limits established by law 24051 (Argentina) on hazardous waste. Regarding the ecotoxicity analysis, it is observed that sunflower husk ashes inhibit the growth of seedlings at the studied concentrations. It can be concluded that it is not convenient to use the ashes as soil filler because it would produce alkaline soil, transferring a large amount of electrolytes, and producing negative effects on the development of many species that need acid or slightly alkaline soil. From the experimental results and the analysis of the equilibrium diagrams of the major oxides of claywaste mixtures, the theoretical sintering temperature was determined. It shows that it is feasible to incorporate up to 20% of this waste material holding sintering temperatures commonly used in the ceramic industry (1050°C). For higher

Ayçiçeği Bitki Atık Küllerinin Bazı Bitki Besin Elementlerinin Belirlenmesi

“…Paleckiene et al (2012) in their study on obtaining fertilizer from rapeseed plant waste ash and sugar factory wastes found that rapeseed plant waste ash consists of 6.2% phosphorus element, 20.7% potassium element, 23.2% calcium element and 2.1% magnesium element Paleckiene et al (2012), in the study they conducted in order to determine the physical and chemical properties of the fertilizer obtained by adding various additives (sugar factory lime, molasses, urea formaldehyde resin) to the ash obtained from sunflower residues found that there were 10.94% P 2 O 5 , 25.84% K 2 O, 24.27% CaO, 19.07% MgO, 18.58% compounds in sunflower waste ash. Quaranta et al (2016), in their study of using ash obtained by burning sunflower husks in the production of ceramics or its re-use as a soil additive, found 15.6% Mg, 7.9% Ca, 4.8% P and 4.6% K in the content of sunflower husk ash. In a study on rapeseed plants in Poland, the chemical composition of the rapeseed waste ash was determined to be containing 15.1 g kg -1 phosphorus element, 155.7 g kg -1 potassium element, 124.0 g kg -1 calcium element and 7.3 g kg -1 phosphorus element (Piekarczyk et al, 2011).…”

The influence of nanosunflower ash and nanowalnut shell ash on sustainable lightweight self-compacting concrete characteristics

“…In the current research, the walnut shells ash (WSA) and sunflower ash (SFA) were acquired from the northern regions in Iraq. The WSA and SFA were put in oven at a 700 ± 50 °C for two hours according to the literature 51 . The ashes were cooled in an open area at room temperature for 30 min after being heated.…”

“…Thus, the recycling of these crusts through the usage in concrete as cement materials aids significantly in producing an environmentally friendly concrete and decreases cement usage. Nevertheless, previous attempts have been made to reuse both walnut shells as coarse or fine aggregate 47 – 50 and sunflower ash in micro size 51 , 52 within concrete. However, no previous research used walnut shells ash and sunflower ash at nano size.…”

Husk Energy Supply Systems for Sunflower Oil Mills

“…Energies 2020, 13, x FOR PEER REVIEW 8 of 15 component to produce fertilizer [52]. Moreover, it is suitable as a filler for the production of ceramics [53]. Its price is more than EUR80/t.…”